Perform Clang IRGen during check (#6569)

Background:
https://docs.google.com/document/d/1wi85FRiWh4X9A-gCYMVGKR40-q5fM6-3JaSpePk-XCY/edit?usp=sharing
And specifically this work is essentially an alternative to #5543

Clang's code generation is implemented through an ASTListener
(clang::CodeGenerator) that is attached throughout Clang's
parsing/sema/code
generation phases and acts on Clang AST incrementally throughout that
process.

Prior to this patch, Carbon has only created the CodeGenerator during
Carbon's
`lower` phase, missing out on key callbacks that would be made by Clang
during
`check`. Some of these issues were addressed by #6237 and #6483 - but
there were
still remaining cases where the delayed processing lead to missing
functionality.

With #6483 much of the Clang code that made multithreaded complexity of
#5543 is
no longer present, and we have access to the point of ASTListener
registration
so we can register the CodeGenerator there and consume its resulting
llvm::Module during lower.

Examples of some of the bugs this addresses are seen in the linked doc,
and
checked in as tests in this change in
`clang_code_generator_callbacks.carbon`

An indicental bug that's also fixed, and caused all the other test case
churn,
is that the `CodeGenerator` created during `lower` wasn't getting passed
the
Clang `CodeGenOpts` and was creating its own default - so, most notably,
optimization flags were not respected. This meant that the LLVM IR from
Clang
was always -O0 style IR (optnone, no inlinehint, no TBAA, etc). With
this
change, now the Clang IRGen gets the real `CodeGenOpts` and respects
optimization/other flags specified there.

This is only meant to be a rough proof of concept - I'm totally open to
reworking this in any way (even quite substantially) if folks have ideas
about
how this should be implemented most generally/elegantly/etc.

toolchain/base/clang_invocation.cpp

@@ -117,6 +117,12 @@ auto BuildClangInvocation(Diagnostics::Consumer& consumer,
     return nullptr;
   }
 
+  if (invocation) {
+    // Do not emit Clang's name and version as the creator of the output file.
+    invocation->getCodeGenOpts().EmitVersionIdentMetadata = false;
+    invocation->getCodeGenOpts().DiscardValueNames = false;
+  }
+
   return invocation;
 }
 

toolchain/check/BUILD

@@ -177,6 +177,7 @@ cc_library(
         "//toolchain/sem_ir:typed_insts",
         "@llvm-project//clang:ast",
         "@llvm-project//clang:basic",
+        "@llvm-project//clang:codegen",
         "@llvm-project//clang:frontend",
         "@llvm-project//clang:lex",
         "@llvm-project//clang:parse",

toolchain/check/check.cpp

@@ -485,7 +485,8 @@ auto CheckParseTrees(
   for (int check_index = 0;
        check_index < static_cast<int>(ready_to_check.size()); ++check_index) {
     auto* unit_info = ready_to_check[check_index];
-    CheckUnit(unit_info, &tree_and_subtrees_getters, fs, clang_invocation,
+    CheckUnit(unit_info, &tree_and_subtrees_getters, fs,
+              unit_info->unit->llvm_context, clang_invocation,
               options.vlog_stream)
         .Run();
     for (auto* incoming_import : unit_info->incoming_imports) {
@@ -534,7 +535,8 @@ auto CheckParseTrees(
     // incomplete imports.
     for (auto& unit_info : unit_infos) {
       if (unit_info.imports_remaining > 0) {
-        CheckUnit(&unit_info, &tree_and_subtrees_getters, fs, clang_invocation,
+        CheckUnit(&unit_info, &tree_and_subtrees_getters, fs,
+                  unit_info.unit->llvm_context, clang_invocation,
                   options.vlog_stream)
             .Run();
       }

toolchain/check/check.h

@@ -27,6 +27,7 @@ struct Unit {
 
   // The unit's SemIR, provided as empty and filled in by CheckParseTrees.
   SemIR::File* sem_ir;
+  llvm::LLVMContext* llvm_context;
   // The total number of files.
   int total_ir_count;
 };

toolchain/check/check_unit.cpp

@@ -60,12 +60,14 @@ CheckUnit::CheckUnit(
     UnitAndImports* unit_and_imports,
     const Parse::GetTreeAndSubtreesStore* tree_and_subtrees_getters,
     llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> fs,
+    llvm::LLVMContext* llvm_context,
     std::shared_ptr<clang::CompilerInvocation> clang_invocation,
     llvm::raw_ostream* vlog_stream)
     : unit_and_imports_(unit_and_imports),
       tree_and_subtrees_getter_(tree_and_subtrees_getters->Get(
           unit_and_imports->unit->sem_ir->check_ir_id())),
       fs_(std::move(fs)),
+      llvm_context_(llvm_context),
       clang_invocation_(std::move(clang_invocation)),
       emitter_(&unit_and_imports_->err_tracker, tree_and_subtrees_getters,
                unit_and_imports_->unit->sem_ir),
@@ -163,7 +165,7 @@ auto CheckUnit::InitPackageScopeAndImports() -> void {
 
   const auto& cpp_imports = unit_and_imports_->cpp_imports;
   if (!cpp_imports.empty()) {
-    ImportCpp(context_, cpp_imports, fs_, clang_invocation_);
+    ImportCpp(context_, cpp_imports, fs_, llvm_context_, clang_invocation_);
   }
 }
 

toolchain/check/check_unit.h

@@ -127,6 +127,7 @@ class CheckUnit {
       UnitAndImports* unit_and_imports,
       const Parse::GetTreeAndSubtreesStore* tree_and_subtrees_getters,
       llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> fs,
+      llvm::LLVMContext* llvm_context,
       std::shared_ptr<clang::CompilerInvocation> clang_invocation,
       llvm::raw_ostream* vlog_stream);
 
@@ -190,6 +191,7 @@ class CheckUnit {
   UnitAndImports* unit_and_imports_;
   Parse::GetTreeAndSubtreesFn tree_and_subtrees_getter_;
   llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> fs_;
+  llvm::LLVMContext* llvm_context_;
   std::shared_ptr<clang::CompilerInvocation> clang_invocation_;
 
   DiagnosticEmitter emitter_;

toolchain/check/cpp/generate_ast.cpp

@@ -9,6 +9,7 @@
 
 #include "clang/AST/ASTContext.h"
 #include "clang/Basic/FileManager.h"
+#include "clang/CodeGen/ModuleBuilder.h"
 #include "clang/Frontend/CompilerInstance.h"
 #include "clang/Frontend/CompilerInvocation.h"
 #include "clang/Frontend/FrontendAction.h"
@@ -330,21 +331,6 @@ class ShallowCopyCompilerInvocation : public clang::CompilerInvocation {
   }
 };
 
-// An AST consumer that tracks top-level declarations so they can be handed off
-// to code generation later.
-class BufferingConsumer : public clang::ASTConsumer {
- public:
-  explicit BufferingConsumer(SemIR::CppFile& file) : file_(&file) {}
-
-  auto HandleTopLevelDecl(clang::DeclGroupRef decl_group) -> bool override {
-    file_->decl_groups().push_back(decl_group);
-    return true;
-  }
-
- private:
-  SemIR::CppFile* file_;
-};
-
 // An action and a set of registered Clang callbacks used to generate an AST
 // from a set of Cpp imports.
 class GenerateASTAction : public clang::ASTFrontendAction {
@@ -352,10 +338,22 @@ class GenerateASTAction : public clang::ASTFrontendAction {
   explicit GenerateASTAction(Context& context) : context_(&context) {}
 
  protected:
-  auto CreateASTConsumer(clang::CompilerInstance& /*clang_instance*/,
-                         llvm::StringRef /*file*/)
+  auto CreateASTConsumer(clang::CompilerInstance& clang_instance,
+                         llvm::StringRef file)
       -> std::unique_ptr<clang::ASTConsumer> override {
-    return std::make_unique<BufferingConsumer>(*context_->sem_ir().cpp_file());
+    auto& cpp_file = *context_->sem_ir().cpp_file();
+    if (!cpp_file.llvm_context()) {
+      return std::make_unique<clang::ASTConsumer>();
+    }
+    auto code_generator =
+        std::unique_ptr<clang::CodeGenerator>(clang::CreateLLVMCodeGen(
+            cpp_file.diagnostics(), file,
+            clang_instance.getVirtualFileSystemPtr(),
+            clang_instance.getHeaderSearchOpts(),
+            clang_instance.getPreprocessorOpts(),
+            clang_instance.getCodeGenOpts(), *cpp_file.llvm_context()));
+    cpp_file.SetCodeGenerator(code_generator.get());
+    return code_generator;
   }
 
   auto BeginSourceFileAction(clang::CompilerInstance& /*clang_instance*/)
@@ -414,6 +412,7 @@ class GenerateASTAction : public clang::ASTFrontendAction {
 auto GenerateAst(Context& context,
                  llvm::ArrayRef<Parse::Tree::PackagingNames> imports,
                  llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> fs,
+                 llvm::LLVMContext* llvm_context,
                  std::shared_ptr<clang::CompilerInvocation> base_invocation)
     -> bool {
   CARBON_CHECK(!context.cpp_context());
@@ -454,8 +453,8 @@ auto GenerateAst(Context& context,
   auto clang_instance_ptr =
       std::make_unique<clang::CompilerInstance>(invocation);
   auto& clang_instance = *clang_instance_ptr;
-  context.sem_ir().set_cpp_file(
-      std::make_unique<SemIR::CppFile>(std::move(clang_instance_ptr)));
+  context.sem_ir().set_cpp_file(std::make_unique<SemIR::CppFile>(
+      std::move(clang_instance_ptr), llvm_context));
 
   clang_instance.setDiagnostics(diags);
   clang_instance.setVirtualFileSystem(fs);

toolchain/check/cpp/generate_ast.h

@@ -18,6 +18,7 @@ namespace Carbon::Check {
 auto GenerateAst(Context& context,
                  llvm::ArrayRef<Parse::Tree::PackagingNames> imports,
                  llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> fs,
+                 llvm::LLVMContext* llvm_context,
                  std::shared_ptr<clang::CompilerInvocation> base_invocation)
     -> bool;
 

toolchain/check/cpp/import.cpp

@@ -116,6 +116,7 @@ static auto AddNamespace(Context& context, PackageNameId cpp_package_id,
 auto ImportCpp(Context& context,
                llvm::ArrayRef<Parse::Tree::PackagingNames> imports,
                llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> fs,
+               llvm::LLVMContext* llvm_context,
                std::shared_ptr<clang::CompilerInvocation> invocation) -> void {
   if (imports.empty()) {
     // TODO: Consider always having a (non-null) AST even if there are no Cpp
@@ -131,7 +132,7 @@ auto ImportCpp(Context& context,
   auto name_scope_id = AddNamespace(context, package_id, imports);
 
   bool ast_has_error =
-      !GenerateAst(context, imports, fs, std::move(invocation));
+      !GenerateAst(context, imports, fs, llvm_context, std::move(invocation));
 
   SemIR::NameScope& name_scope = context.name_scopes().Get(name_scope_id);
   name_scope.set_is_closed_import(true);

toolchain/check/cpp/import.h

@@ -23,6 +23,7 @@ namespace Carbon::Check {
 auto ImportCpp(Context& context,
                llvm::ArrayRef<Parse::Tree::PackagingNames> imports,
                llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> fs,
+               llvm::LLVMContext* llvm_context,
                std::shared_ptr<clang::CompilerInvocation> invocation) -> void;
 
 // Imports a declaration from Clang to Carbon. If successful, returns the new

toolchain/driver/BUILD

@@ -222,6 +222,7 @@ cc_library(
         "//toolchain/sem_ir:file",
         "//toolchain/sem_ir:typed_insts",
         "//toolchain/source:source_buffer",
+        "@llvm-project//clang:codegen",
         "@llvm-project//llvm:Core",
         "@llvm-project//llvm:MC",
         "@llvm-project//llvm:Passes",

toolchain/driver/compile_subcommand.cpp

@@ -580,8 +580,8 @@ class CompilationUnit {
   std::optional<Parse::TreeAndSubtrees> parse_tree_and_subtrees_;
   std::optional<std::function<auto()->const Parse::TreeAndSubtrees&>>
       tree_and_subtrees_getter_;
-  std::optional<SemIR::File> sem_ir_;
   std::unique_ptr<llvm::LLVMContext> llvm_context_;
+  std::optional<SemIR::File> sem_ir_;
   std::unique_ptr<llvm::Module> module_;
   std::unique_ptr<llvm::TargetMachine> target_machine_;
 };
@@ -769,10 +769,14 @@ auto CompilationUnit::GetCheckUnit() -> Check::Unit {
   };
   sem_ir_.emplace(&*parse_tree_, check_ir_id_, parse_tree_->packaging_decl(),
                   value_stores_, input_filename_);
+  if (!llvm_context_) {
+    llvm_context_ = std::make_unique<llvm::LLVMContext>();
+  }
   return {.consumer = consumer_,
           .value_stores = &value_stores_,
           .timings = timings_ ? &*timings_ : nullptr,
           .sem_ir = &*sem_ir_,
+          .llvm_context = llvm_context_.get(),
           .total_ir_count = total_ir_count_};
 }
 
@@ -795,7 +799,9 @@ auto CompilationUnit::PostCheck() -> void {
 
 auto CompilationUnit::RunLower() -> void {
   LogCall("Lower::LowerToLLVM", "lower", [&] {
-    llvm_context_ = std::make_unique<llvm::LLVMContext>();
+    if (!llvm_context_) {
+      llvm_context_ = std::make_unique<llvm::LLVMContext>();
+    }
     Lower::LowerToLLVMOptions options;
     options.llvm_verifier_stream =
         options_->run_llvm_verifier ? driver_env_->error_stream : nullptr;

toolchain/driver/testdata/compile/optimize/clang_no_optimize_twice.carbon

@@ -34,42 +34,48 @@ fn Call() -> i32 {
 // CHECK:STDOUT: $_Z1fv = comdat any
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: noinline nounwind optnone
-// CHECK:STDOUT: define i32 @_CCall.Main() #0 !dbg !7 {
+// CHECK:STDOUT: define i32 @_CCall.Main() #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %g.call = call i32 @_Z1gv(), !dbg !11
-// CHECK:STDOUT:   ret i32 %g.call, !dbg !12
+// CHECK:STDOUT:   %g.call = call i32 @_Z1gv(), !dbg !16
+// CHECK:STDOUT:   ret i32 %g.call, !dbg !17
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: mustprogress noinline optnone
-// CHECK:STDOUT: define dso_local i32 @_Z1gv() #1 {
+// CHECK:STDOUT: ; Function Attrs: mustprogress uwtable
+// CHECK:STDOUT: define dso_local noundef i32 @_Z1gv() #1 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %call = call i32 @_Z1fv()
+// CHECK:STDOUT:   %call = call noundef i32 @_Z1fv()
 // CHECK:STDOUT:   ret i32 %call
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: mustprogress noinline nounwind optnone
-// CHECK:STDOUT: define linkonce_odr dso_local i32 @_Z1fv() #2 comdat {
+// CHECK:STDOUT: ; Function Attrs: inlinehint mustprogress nounwind uwtable
+// CHECK:STDOUT: define linkonce_odr dso_local noundef i32 @_Z1fv() #2 comdat {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   ret i32 42
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { noinline nounwind optnone }
-// CHECK:STDOUT: attributes #1 = { mustprogress noinline optnone "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
-// CHECK:STDOUT: attributes #2 = { mustprogress noinline nounwind optnone "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #1 = { mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #2 = { inlinehint mustprogress nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "foo.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "Call", linkageName: "_CCall.Main", scope: null, file: !6, line: 12, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{!10}
-// CHECK:STDOUT: !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
-// CHECK:STDOUT: !11 = !DILocation(line: 13, column: 10, scope: !7)
-// CHECK:STDOUT: !12 = !DILocation(line: 13, column: 3, scope: !7)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "foo.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "Call", linkageName: "_CCall.Main", scope: null, file: !7, line: 12, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{!15}
+// CHECK:STDOUT: !15 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+// CHECK:STDOUT: !16 = !DILocation(line: 13, column: 10, scope: !12)
+// CHECK:STDOUT: !17 = !DILocation(line: 13, column: 3, scope: !12)

toolchain/lower/file_context.cpp

@@ -62,25 +62,16 @@ FileContext::FileContext(Context& context, const SemIR::File& sem_ir,
       vtables_(decltype(vtables_)::MakeForOverwrite(sem_ir.vtables())),
       specific_vtables_(sem_ir.specifics(), nullptr) {
   // Initialization that relies on invariants of the class.
-  cpp_code_generator_ = CreateCppCodeGenerator();
+  cpp_code_generator_ = cpp_file() ? cpp_file()->GetCodeGenerator() : nullptr;
+  CARBON_CHECK(
+      !cpp_code_generator_ ||
+      (&cpp_code_generator_->GetModule()->getContext() == &llvm_context()));
   CARBON_CHECK(!sem_ir.has_errors(),
                "Generating LLVM IR from invalid SemIR::File is unsupported.");
 }
 
 // TODO: Move this to lower.cpp.
 auto FileContext::PrepareToLower() -> void {
-  if (cpp_code_generator_) {
-    // Clang code generation should not actually modify the AST, but isn't
-    // const-correct.
-    cpp_code_generator_->Initialize(
-        const_cast<clang::ASTContext&>(cpp_file()->ast_context()));
-
-    // Emit any top-level declarations now.
-    for (auto decl_group : cpp_file()->decl_groups()) {
-      cpp_code_generator_->HandleTopLevelDecl(decl_group);
-    }
-  }
-
   // Lower all types that were required to be complete.
   for (auto type_id : sem_ir_->types().complete_types()) {
     if (type_id.index >= 0) {
@@ -185,24 +176,6 @@ auto FileContext::Finalize() -> void {
                                          specific_functions_);
 }
 
-auto FileContext::CreateCppCodeGenerator()
-    -> std::unique_ptr<clang::CodeGenerator> {
-  if (!cpp_file()) {
-    return nullptr;
-  }
-
-  RawStringOstream clang_module_name_stream;
-  clang_module_name_stream << llvm_module().getName() << ".clang";
-
-  // Do not emit Clang's name and version as the creator of the output file.
-  cpp_code_gen_options_.EmitVersionIdentMetadata = false;
-
-  return std::unique_ptr<clang::CodeGenerator>(clang::CreateLLVMCodeGen(
-      cpp_file()->diagnostics(), clang_module_name_stream.TakeStr(),
-      context().file_system(), cpp_header_search_options_,
-      cpp_preprocessor_options_, cpp_code_gen_options_, llvm_context()));
-}
-
 auto FileContext::GetConstant(SemIR::ConstantId const_id,
                               SemIR::InstId use_inst_id) -> llvm::Value* {
   auto const_inst_id = sem_ir().constant_values().GetInstId(const_id);

toolchain/lower/file_context.h

@@ -5,7 +5,6 @@
 #ifndef CARBON_TOOLCHAIN_LOWER_FILE_CONTEXT_H_
 #define CARBON_TOOLCHAIN_LOWER_FILE_CONTEXT_H_
 
-#include "clang/Basic/CodeGenOptions.h"
 #include "clang/CodeGen/ModuleBuilder.h"
 #include "clang/Lex/PreprocessorOptions.h"
 #include "toolchain/lower/context.h"
@@ -28,10 +27,6 @@ class FileContext {
                        const SemIR::InstNamer* inst_namer,
                        llvm::raw_ostream* vlog_stream);
 
-  // Creates the Clang `CodeGenerator` to generate LLVM module from imported C++
-  // code. Returns null when not importing C++.
-  auto CreateCppCodeGenerator() -> std::unique_ptr<clang::CodeGenerator>;
-
   // Prepares to lower code in this IR, by precomputing needed LLVM types,
   // constants, declarations, etc. Should only be called once, before we lower
   // anything in this file.
@@ -231,15 +226,9 @@ class FileContext {
   // The input SemIR.
   const SemIR::File* const sem_ir_;
 
-  // The options used to create the Clang Code Generator.
-  clang::HeaderSearchOptions cpp_header_search_options_;
-  clang::PreprocessorOptions cpp_preprocessor_options_;
-  clang::CodeGenOptions cpp_code_gen_options_;
-
   // The Clang `CodeGenerator` to generate LLVM module from imported C++
-  // code. Should be initialized using `CreateCppCodeGenerator()`. Can be null
-  // if no C++ code is imported.
-  std::unique_ptr<clang::CodeGenerator> cpp_code_generator_;
+  // code. Can be null if no C++ code is imported.
+  clang::CodeGenerator* cpp_code_generator_;
 
   // The instruction namer, if given.
   const SemIR::InstNamer* const inst_namer_;

toolchain/lower/testdata/interop/cpp/base.carbon

@@ -64,84 +64,96 @@ fn Call(b: Cpp.B*) {
 // CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define ptr @_CConvertPtr.Main(ptr %p) #0 !dbg !7 {
+// CHECK:STDOUT: define ptr @_CConvertPtr.Main(ptr %p) #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc7_11.2.base = getelementptr inbounds nuw [8 x i8], ptr %p, i32 0, i32 0, !dbg !13
-// CHECK:STDOUT:   ret ptr %.loc7_11.2.base, !dbg !13
+// CHECK:STDOUT:   %.loc7_11.2.base = getelementptr inbounds nuw [8 x i8], ptr %p, i32 0, i32 0, !dbg !18
+// CHECK:STDOUT:   ret ptr %.loc7_11.2.base, !dbg !18
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: declare void @_CAcceptVal.Main(ptr)
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CConvertVal.Main(ptr %b) #0 !dbg !14 {
+// CHECK:STDOUT: define void @_CConvertVal.Main(ptr %b) #0 !dbg !19 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc13_13.1.base = getelementptr inbounds nuw [8 x i8], ptr %b, i32 0, i32 0, !dbg !19
-// CHECK:STDOUT:   call void @_CAcceptVal.Main(ptr %.loc13_13.1.base), !dbg !20
-// CHECK:STDOUT:   ret void, !dbg !21
+// CHECK:STDOUT:   %.loc13_13.1.base = getelementptr inbounds nuw [8 x i8], ptr %b, i32 0, i32 0, !dbg !24
+// CHECK:STDOUT:   call void @_CAcceptVal.Main(ptr %.loc13_13.1.base), !dbg !25
+// CHECK:STDOUT:   ret void, !dbg !26
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "convert.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "ConvertPtr", linkageName: "_CConvertPtr.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !11)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{!10, !10}
-// CHECK:STDOUT: !10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
-// CHECK:STDOUT: !11 = !{!12}
-// CHECK:STDOUT: !12 = !DILocalVariable(arg: 1, scope: !7, type: !10)
-// CHECK:STDOUT: !13 = !DILocation(line: 7, column: 3, scope: !7)
-// CHECK:STDOUT: !14 = distinct !DISubprogram(name: "ConvertVal", linkageName: "_CConvertVal.Main", scope: null, file: !6, line: 12, type: !15, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !17)
-// CHECK:STDOUT: !15 = !DISubroutineType(types: !16)
-// CHECK:STDOUT: !16 = !{null, !10}
-// CHECK:STDOUT: !17 = !{!18}
-// CHECK:STDOUT: !18 = !DILocalVariable(arg: 1, scope: !14, type: !10)
-// CHECK:STDOUT: !19 = !DILocation(line: 13, column: 13, scope: !14)
-// CHECK:STDOUT: !20 = !DILocation(line: 13, column: 3, scope: !14)
-// CHECK:STDOUT: !21 = !DILocation(line: 12, column: 1, scope: !14)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "convert.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "ConvertPtr", linkageName: "_CConvertPtr.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !16)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{!15, !15}
+// CHECK:STDOUT: !15 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
+// CHECK:STDOUT: !16 = !{!17}
+// CHECK:STDOUT: !17 = !DILocalVariable(arg: 1, scope: !12, type: !15)
+// CHECK:STDOUT: !18 = !DILocation(line: 7, column: 3, scope: !12)
+// CHECK:STDOUT: !19 = distinct !DISubprogram(name: "ConvertVal", linkageName: "_CConvertVal.Main", scope: null, file: !7, line: 12, type: !20, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !22)
+// CHECK:STDOUT: !20 = !DISubroutineType(types: !21)
+// CHECK:STDOUT: !21 = !{null, !15}
+// CHECK:STDOUT: !22 = !{!23}
+// CHECK:STDOUT: !23 = !DILocalVariable(arg: 1, scope: !19, type: !15)
+// CHECK:STDOUT: !24 = !DILocation(line: 13, column: 13, scope: !19)
+// CHECK:STDOUT: !25 = !DILocation(line: 13, column: 3, scope: !19)
+// CHECK:STDOUT: !26 = !DILocation(line: 12, column: 1, scope: !19)
 // CHECK:STDOUT: ; ModuleID = 'access_field.carbon'
 // CHECK:STDOUT: source_filename = "access_field.carbon"
 // CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
 // CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define i32 @_CAccessVal.Main(ptr %b) #0 !dbg !7 {
+// CHECK:STDOUT: define i32 @_CAccessVal.Main(ptr %b) #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc7_11.1.base = getelementptr inbounds nuw [8 x i8], ptr %b, i32 0, i32 0, !dbg !14
-// CHECK:STDOUT:   %.loc7_11.3.a = getelementptr inbounds nuw [4 x i8], ptr %.loc7_11.1.base, i32 0, i32 0, !dbg !14
-// CHECK:STDOUT:   %.loc7_11.4 = load i32, ptr %.loc7_11.3.a, align 4, !dbg !14
-// CHECK:STDOUT:   ret i32 %.loc7_11.4, !dbg !15
+// CHECK:STDOUT:   %.loc7_11.1.base = getelementptr inbounds nuw [8 x i8], ptr %b, i32 0, i32 0, !dbg !19
+// CHECK:STDOUT:   %.loc7_11.3.a = getelementptr inbounds nuw [4 x i8], ptr %.loc7_11.1.base, i32 0, i32 0, !dbg !19
+// CHECK:STDOUT:   %.loc7_11.4 = load i32, ptr %.loc7_11.3.a, align 4, !dbg !19
+// CHECK:STDOUT:   ret i32 %.loc7_11.4, !dbg !20
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "access_field.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "AccessVal", linkageName: "_CAccessVal.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !12)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{!10, !11}
-// CHECK:STDOUT: !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
-// CHECK:STDOUT: !11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
-// CHECK:STDOUT: !12 = !{!13}
-// CHECK:STDOUT: !13 = !DILocalVariable(arg: 1, scope: !7, type: !11)
-// CHECK:STDOUT: !14 = !DILocation(line: 7, column: 10, scope: !7)
-// CHECK:STDOUT: !15 = !DILocation(line: 7, column: 3, scope: !7)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "access_field.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "AccessVal", linkageName: "_CAccessVal.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !17)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{!15, !16}
+// CHECK:STDOUT: !15 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+// CHECK:STDOUT: !16 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
+// CHECK:STDOUT: !17 = !{!18}
+// CHECK:STDOUT: !18 = !DILocalVariable(arg: 1, scope: !12, type: !16)
+// CHECK:STDOUT: !19 = !DILocation(line: 7, column: 10, scope: !12)
+// CHECK:STDOUT: !20 = !DILocation(line: 7, column: 3, scope: !12)
 // CHECK:STDOUT: ; ModuleID = 'call_method.carbon'
 // CHECK:STDOUT: source_filename = "call_method.carbon"
 // CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
@@ -150,40 +162,49 @@ fn Call(b: Cpp.B*) {
 // CHECK:STDOUT: $_ZN1A1fEv = comdat any
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CCall.Main(ptr %b) #0 !dbg !7 {
+// CHECK:STDOUT: define void @_CCall.Main(ptr %b) #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc7_4.2.base = getelementptr inbounds nuw [8 x i8], ptr %b, i32 0, i32 0, !dbg !13
-// CHECK:STDOUT:   call void @_ZN1A1fEv(ptr %.loc7_4.2.base), !dbg !13
-// CHECK:STDOUT:   ret void, !dbg !14
+// CHECK:STDOUT:   %.loc7_4.2.base = getelementptr inbounds nuw [8 x i8], ptr %b, i32 0, i32 0, !dbg !18
+// CHECK:STDOUT:   call void @_ZN1A1fEv(ptr %.loc7_4.2.base), !dbg !18
+// CHECK:STDOUT:   ret void, !dbg !19
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: mustprogress noinline nounwind optnone
-// CHECK:STDOUT: define linkonce_odr dso_local void @_ZN1A1fEv(ptr nonnull align 4 dereferenceable(4) %this) #1 comdat align 2 {
+// CHECK:STDOUT: ; Function Attrs: mustprogress nounwind uwtable
+// CHECK:STDOUT: define linkonce_odr dso_local void @_ZN1A1fEv(ptr noundef nonnull align 4 dereferenceable(4) %this) #1 comdat align 2 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %this.addr = alloca ptr, align 8
-// CHECK:STDOUT:   store ptr %this, ptr %this.addr, align 8
+// CHECK:STDOUT:   store ptr %this, ptr %this.addr, align 8, !tbaa !20
 // CHECK:STDOUT:   %this1 = load ptr, ptr %this.addr, align 8
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
-// CHECK:STDOUT: attributes #1 = { mustprogress noinline nounwind optnone "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #1 = { mustprogress nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "call_method.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "Call", linkageName: "_CCall.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !11)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{null, !10}
-// CHECK:STDOUT: !10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
-// CHECK:STDOUT: !11 = !{!12}
-// CHECK:STDOUT: !12 = !DILocalVariable(arg: 1, scope: !7, type: !10)
-// CHECK:STDOUT: !13 = !DILocation(line: 7, column: 3, scope: !7)
-// CHECK:STDOUT: !14 = !DILocation(line: 6, column: 1, scope: !7)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "call_method.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "Call", linkageName: "_CCall.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !16)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{null, !15}
+// CHECK:STDOUT: !15 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
+// CHECK:STDOUT: !16 = !{!17}
+// CHECK:STDOUT: !17 = !DILocalVariable(arg: 1, scope: !12, type: !15)
+// CHECK:STDOUT: !18 = !DILocation(line: 7, column: 3, scope: !12)
+// CHECK:STDOUT: !19 = !DILocation(line: 6, column: 1, scope: !12)
+// CHECK:STDOUT: !20 = !{!21, !21, i64 0}
+// CHECK:STDOUT: !21 = !{!"p1 _ZTS1A", !22, i64 0}
+// CHECK:STDOUT: !22 = !{!"any pointer", !10, i64 0}

toolchain/lower/testdata/interop/cpp/clang_code_generator_callbacks.carbon

@@ -0,0 +1,149 @@
+// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
+// Exceptions. See /LICENSE for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/full.carbon
+// EXTRA-ARGS: --target=x86_64-linux-gnu
+//
+// AUTOUPDATE
+// TIP: To test this file alone, run:
+// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/lower/testdata/interop/cpp/clang_code_generator_callbacks.carbon
+// TIP: To dump output, run:
+// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/interop/cpp/clang_code_generator_callbacks.carbon
+
+library "[[@TEST_NAME]]";
+
+import Cpp inline '''
+
+// Clang uses an implementation of clang::ASTConsumer to implement code
+// generation, it has a variety of callbacks that may be called throughout the
+// process of parsing/semantically analyzing the source code. Below are test
+// cases based on those callbacks to ensure that C++ code compiled as part of
+// Carbon interop imports preserve Clang's behavior.
+
+struct t1 {
+  virtual void f1();
+};
+// HandleVTable - Emit a definition for `t1`'s vtable.
+void t1::f1() { }
+
+// CompleteExternalDeclaration - Only be related to the BPF target.
+
+// CompleteTentativeDefinition - Only relevant to C code.
+
+// AssignInheritanceModel - Only relevant to ms inheritance attribute
+
+// HandleTagDeclRequiredDefinition - Only relevant to ms debug info (only
+// fails clang/test/DebugInfo/CXX/dllimport-base-class.cpp)
+
+// HandleTagDeclDefinition - updating previous IR when a definition for a type
+// is provided.
+struct S;
+extern S a[10];
+S(*b)[10] = &a;
+struct S {
+  int x;
+};
+int f() { return a[3].x; }
+// without the callback, clang describes the type of 'a' as 10xi8, resulting in
+// this:
+//   load i32, ptr getelementptr inbounds ([10 x i8], ptr @a, i64 0, i64 3), align 4
+// with the callback, the type gets updated and the result is:
+//   load i32, ptr getelementptr inbounds ([10 x %struct.S], ptr @a, i64 0, i64 3), align 4
+
+// HandleInlineFunctionDefinition+EmitDeferredDecls - Emit a definition of
+// `func`.
+struct t2 {
+  __attribute__((used)) void func() {}
+};
+
+// HandleCXXStaticMemberVarInstantiation - Emit a definition for
+// `t3<int>::i`.
+template<typename T>
+struct t3 {
+  static int i;
+};
+template<typename T>
+int t3<T>::i;
+void f2() {
+  t3<int>::i = 42;
+}
+''';
+
+// CHECK:STDOUT: ; ModuleID = 'clang_code_generator_callbacks.carbon'
+// CHECK:STDOUT: source_filename = "clang_code_generator_callbacks.carbon"
+// CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
+// CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
+// CHECK:STDOUT:
+// CHECK:STDOUT: %struct.S = type { i32 }
+// CHECK:STDOUT:
+// CHECK:STDOUT: $_ZN2t24funcEv = comdat any
+// CHECK:STDOUT:
+// CHECK:STDOUT: $_ZN2t3IiE1iE = comdat any
+// CHECK:STDOUT:
+// CHECK:STDOUT: @llvm.compiler.used = appending global [1 x ptr] [ptr @_ZN2t24funcEv], section "llvm.metadata"
+// CHECK:STDOUT: @a = external global [10 x i8], align 1
+// CHECK:STDOUT: @b = dso_local global ptr @a, align 8
+// CHECK:STDOUT: @_ZN2t3IiE1iE = linkonce_odr dso_local global i32 0, comdat, align 4
+// CHECK:STDOUT: @_ZTV2t1 = dso_local unnamed_addr constant { [3 x ptr] } { [3 x ptr] [ptr null, ptr @_ZTI2t1, ptr @_ZN2t12f1Ev] }, align 8
+// CHECK:STDOUT: @_ZTI2t1 = dso_local constant { ptr, ptr } { ptr getelementptr inbounds (ptr, ptr @_ZTVN10__cxxabiv117__class_type_infoE, i64 2), ptr @_ZTS2t1 }, align 8
+// CHECK:STDOUT: @_ZTVN10__cxxabiv117__class_type_infoE = external global [0 x ptr]
+// CHECK:STDOUT: @_ZTS2t1 = dso_local constant [4 x i8] c"2t1\00", align 1
+// CHECK:STDOUT:
+// CHECK:STDOUT: ; Function Attrs: mustprogress nounwind uwtable
+// CHECK:STDOUT: define dso_local void @_ZN2t12f1Ev(ptr noundef nonnull align 8 dereferenceable(8) %this) unnamed_addr #0 align 2 {
+// CHECK:STDOUT: entry:
+// CHECK:STDOUT:   %this.addr = alloca ptr, align 8
+// CHECK:STDOUT:   store ptr %this, ptr %this.addr, align 8, !tbaa !12
+// CHECK:STDOUT:   %this1 = load ptr, ptr %this.addr, align 8
+// CHECK:STDOUT:   ret void
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: ; Function Attrs: mustprogress nounwind uwtable
+// CHECK:STDOUT: define linkonce_odr dso_local void @_ZN2t24funcEv(ptr noundef nonnull align 1 dereferenceable(1) %this) #0 comdat align 2 {
+// CHECK:STDOUT: entry:
+// CHECK:STDOUT:   %this.addr = alloca ptr, align 8
+// CHECK:STDOUT:   store ptr %this, ptr %this.addr, align 8, !tbaa !15
+// CHECK:STDOUT:   %this1 = load ptr, ptr %this.addr, align 8
+// CHECK:STDOUT:   ret void
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: ; Function Attrs: mustprogress nounwind uwtable
+// CHECK:STDOUT: define dso_local noundef i32 @_Z1fv() #0 {
+// CHECK:STDOUT: entry:
+// CHECK:STDOUT:   %0 = load i32, ptr getelementptr inbounds ([10 x %struct.S], ptr @a, i64 0, i64 3), align 4, !tbaa !17
+// CHECK:STDOUT:   ret i32 %0
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: ; Function Attrs: mustprogress nounwind uwtable
+// CHECK:STDOUT: define dso_local void @_Z2f2v() #0 {
+// CHECK:STDOUT: entry:
+// CHECK:STDOUT:   store i32 42, ptr @_ZN2t3IiE1iE, align 4, !tbaa !8
+// CHECK:STDOUT:   ret void
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: attributes #0 = { mustprogress nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT:
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
+// CHECK:STDOUT:
+// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
+// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
+// CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
+// CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
+// CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "clang_code_generator_callbacks.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = !{!13, !13, i64 0}
+// CHECK:STDOUT: !13 = !{!"p1 _ZTS2t1", !14, i64 0}
+// CHECK:STDOUT: !14 = !{!"any pointer", !10, i64 0}
+// CHECK:STDOUT: !15 = !{!16, !16, i64 0}
+// CHECK:STDOUT: !16 = !{!"p1 _ZTS2t2", !14, i64 0}
+// CHECK:STDOUT: !17 = !{!18, !9, i64 0}
+// CHECK:STDOUT: !18 = !{!"_ZTS1S", !9, i64 0}

toolchain/lower/testdata/interop/cpp/constructor.carbon

@@ -60,6 +60,26 @@ fn Copy(c: Cpp.Copy) -> Cpp.Copy {
   return c;
 }
 
+// ============================================================================
+// C1 constructor
+// ============================================================================
+
+// --- header.h
+
+struct Base { };
+struct Derived: virtual Base {
+};
+
+// --- call_c1_in_thunk.carbon
+
+library "[[@TEST_NAME]]";
+
+import Cpp library "header.h";
+
+fn F() {
+  let _: Cpp.Derived = Cpp.Derived.Derived();
+}
+
 // CHECK:STDOUT: ; ModuleID = 'import_default.carbon'
 // CHECK:STDOUT: source_filename = "import_default.carbon"
 // CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
@@ -67,140 +87,236 @@ fn Copy(c: Cpp.Copy) -> Cpp.Copy {
 // CHECK:STDOUT:
 // CHECK:STDOUT: %class.C = type { i32, i32 }
 // CHECK:STDOUT:
-// CHECK:STDOUT: $_ZN1CC1Ev = comdat any
-// CHECK:STDOUT:
 // CHECK:STDOUT: $_ZN1CC2Ev = comdat any
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CF.Main() #0 !dbg !7 {
+// CHECK:STDOUT: define void @_CF.Main() #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc7_26.1.temp = alloca [8 x i8], align 1, !dbg !10
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc7_26.1.temp), !dbg !10
-// CHECK:STDOUT:   call void @_ZN1CC1Ev.carbon_thunk(ptr %.loc7_26.1.temp), !dbg !10
-// CHECK:STDOUT:   ret void, !dbg !11
+// CHECK:STDOUT:   %.loc7_26.1.temp = alloca [8 x i8], align 1, !dbg !15
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc7_26.1.temp), !dbg !15
+// CHECK:STDOUT:   call void @_ZN1CC1Ev.carbon_thunk(ptr %.loc7_26.1.temp), !dbg !15
+// CHECK:STDOUT:   ret void, !dbg !16
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
 // CHECK:STDOUT: declare void @llvm.lifetime.start.p0(ptr captures(none)) #1
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local void @_ZN1CC1Ev.carbon_thunk(ptr %return) #2 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local void @_ZN1CC1Ev.carbon_thunk(ptr noundef %return) #2 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %return.addr = alloca ptr, align 8
-// CHECK:STDOUT:   store ptr %return, ptr %return.addr, align 8
-// CHECK:STDOUT:   %0 = load ptr, ptr %return.addr, align 8
-// CHECK:STDOUT:   call void @_ZN1CC1Ev(ptr nonnull align 4 dereferenceable(8) %0)
+// CHECK:STDOUT:   store ptr %return, ptr %return.addr, align 8, !tbaa !17
+// CHECK:STDOUT:   %0 = load ptr, ptr %return.addr, align 8, !tbaa !17
+// CHECK:STDOUT:   call void @_ZN1CC2Ev(ptr noundef nonnull align 4 dereferenceable(8) %0)
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: mustprogress noinline optnone
-// CHECK:STDOUT: define linkonce_odr dso_local void @_ZN1CC1Ev(ptr nonnull align 4 dereferenceable(8) %this) unnamed_addr #3 comdat align 2 {
+// CHECK:STDOUT: ; Function Attrs: mustprogress nounwind uwtable
+// CHECK:STDOUT: define linkonce_odr dso_local void @_ZN1CC2Ev(ptr noundef nonnull align 4 dereferenceable(8) %this) unnamed_addr #3 comdat align 2 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %this.addr = alloca ptr, align 8
-// CHECK:STDOUT:   store ptr %this, ptr %this.addr, align 8
-// CHECK:STDOUT:   %this1 = load ptr, ptr %this.addr, align 8
-// CHECK:STDOUT:   call void @_ZN1CC2Ev(ptr nonnull align 4 dereferenceable(8) %this1)
-// CHECK:STDOUT:   ret void
-// CHECK:STDOUT: }
-// CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: mustprogress noinline nounwind optnone
-// CHECK:STDOUT: define linkonce_odr dso_local void @_ZN1CC2Ev(ptr nonnull align 4 dereferenceable(8) %this) unnamed_addr #4 comdat align 2 {
-// CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %this.addr = alloca ptr, align 8
-// CHECK:STDOUT:   store ptr %this, ptr %this.addr, align 8
+// CHECK:STDOUT:   store ptr %this, ptr %this.addr, align 8, !tbaa !17
 // CHECK:STDOUT:   %this1 = load ptr, ptr %this.addr, align 8
 // CHECK:STDOUT:   %x_ = getelementptr inbounds nuw %class.C, ptr %this1, i32 0, i32 0
-// CHECK:STDOUT:   store i32 8, ptr %x_, align 4
+// CHECK:STDOUT:   store i32 8, ptr %x_, align 4, !tbaa !20
 // CHECK:STDOUT:   %y_ = getelementptr inbounds nuw %class.C, ptr %this1, i32 0, i32 1
-// CHECK:STDOUT:   store i32 9, ptr %y_, align 4
+// CHECK:STDOUT:   store i32 9, ptr %y_, align 4, !tbaa !22
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
-// CHECK:STDOUT: attributes #2 = { alwaysinline mustprogress "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
-// CHECK:STDOUT: attributes #3 = { mustprogress noinline optnone "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
-// CHECK:STDOUT: attributes #4 = { mustprogress noinline nounwind optnone "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #2 = { alwaysinline mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #3 = { mustprogress nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "import_default.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{null}
-// CHECK:STDOUT: !10 = !DILocation(line: 7, column: 18, scope: !7)
-// CHECK:STDOUT: !11 = !DILocation(line: 6, column: 1, scope: !7)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "import_default.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{null}
+// CHECK:STDOUT: !15 = !DILocation(line: 7, column: 18, scope: !12)
+// CHECK:STDOUT: !16 = !DILocation(line: 6, column: 1, scope: !12)
+// CHECK:STDOUT: !17 = !{!18, !18, i64 0}
+// CHECK:STDOUT: !18 = !{!"p1 _ZTS1C", !19, i64 0}
+// CHECK:STDOUT: !19 = !{!"any pointer", !10, i64 0}
+// CHECK:STDOUT: !20 = !{!21, !9, i64 0}
+// CHECK:STDOUT: !21 = !{!"_ZTS1C", !9, i64 0, !9, i64 4}
+// CHECK:STDOUT: !22 = !{!21, !9, i64 4}
 // CHECK:STDOUT: ; ModuleID = 'call_copy.carbon'
 // CHECK:STDOUT: source_filename = "call_copy.carbon"
 // CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
 // CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CCopy.Main(ptr sret([4 x i8]) %return, ptr %c) #0 !dbg !7 {
+// CHECK:STDOUT: define void @_CCopy.Main(ptr sret([4 x i8]) %return, ptr %c) #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc7_10.1.temp = alloca [4 x i8], align 1, !dbg !13
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc7_10.1.temp), !dbg !13
-// CHECK:STDOUT:   call void @_ZN4CopyC1ERKS_.carbon_thunk(ptr %c, ptr %return), !dbg !13
-// CHECK:STDOUT:   ret void, !dbg !14
+// CHECK:STDOUT:   %.loc7_10.1.temp = alloca [4 x i8], align 1, !dbg !18
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc7_10.1.temp), !dbg !18
+// CHECK:STDOUT:   call void @_ZN4CopyC1ERKS_.carbon_thunk(ptr %c, ptr %return), !dbg !18
+// CHECK:STDOUT:   ret void, !dbg !19
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: alwaysinline nounwind
-// CHECK:STDOUT: define void @"_COp:thunk.Copy.Cpp"(ptr sret([4 x i8]) %return, ptr %self) #1 !dbg !15 {
+// CHECK:STDOUT: define void @"_COp:thunk.Copy.Cpp"(ptr sret([4 x i8]) %return, ptr %self) #1 !dbg !20 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   call void @_ZN4CopyC1ERKS_.carbon_thunk(ptr %self, ptr %return), !dbg !18
-// CHECK:STDOUT:   ret void, !dbg !18
+// CHECK:STDOUT:   call void @_ZN4CopyC1ERKS_.carbon_thunk(ptr %self, ptr %return), !dbg !23
+// CHECK:STDOUT:   ret void, !dbg !23
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
 // CHECK:STDOUT: declare void @llvm.lifetime.start.p0(ptr captures(none)) #2
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local void @_ZN4CopyC1ERKS_.carbon_thunk(ptr %0, ptr %return) #3 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local void @_ZN4CopyC1ERKS_.carbon_thunk(ptr noundef %0, ptr noundef %return) #3 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %.addr = alloca ptr, align 8
 // CHECK:STDOUT:   %return.addr = alloca ptr, align 8
-// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8
-// CHECK:STDOUT:   store ptr %return, ptr %return.addr, align 8
-// CHECK:STDOUT:   %1 = load ptr, ptr %return.addr, align 8
-// CHECK:STDOUT:   %2 = load ptr, ptr %.addr, align 8
-// CHECK:STDOUT:   call void @_ZN4CopyC1ERKS_(ptr nonnull align 4 dereferenceable(4) %1, ptr nonnull align 4 dereferenceable(4) %2)
+// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8, !tbaa !24
+// CHECK:STDOUT:   store ptr %return, ptr %return.addr, align 8, !tbaa !24
+// CHECK:STDOUT:   %1 = load ptr, ptr %return.addr, align 8, !tbaa !24
+// CHECK:STDOUT:   %2 = load ptr, ptr %.addr, align 8, !tbaa !24
+// CHECK:STDOUT:   call void @_ZN4CopyC1ERKS_(ptr noundef nonnull align 4 dereferenceable(4) %1, ptr noundef nonnull align 4 dereferenceable(4) %2)
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare void @_ZN4CopyC1ERKS_(ptr nonnull align 4 dereferenceable(4), ptr nonnull align 4 dereferenceable(4)) unnamed_addr #4
+// CHECK:STDOUT: declare void @_ZN4CopyC1ERKS_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) unnamed_addr #4
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT: attributes #1 = { alwaysinline nounwind }
 // CHECK:STDOUT: attributes #2 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
-// CHECK:STDOUT: attributes #3 = { alwaysinline mustprogress "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
-// CHECK:STDOUT: attributes #4 = { "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #3 = { alwaysinline mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #4 = { "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "call_copy.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "Copy", linkageName: "_CCopy.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !11)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{!10, !10}
-// CHECK:STDOUT: !10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
-// CHECK:STDOUT: !11 = !{!12}
-// CHECK:STDOUT: !12 = !DILocalVariable(arg: 1, scope: !7, type: !10)
-// CHECK:STDOUT: !13 = !DILocation(line: 7, column: 10, scope: !7)
-// CHECK:STDOUT: !14 = !DILocation(line: 7, column: 3, scope: !7)
-// CHECK:STDOUT: !15 = distinct !DISubprogram(name: "Op", linkageName: "_COp:thunk.Copy.Cpp", scope: null, file: !6, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !16)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "call_copy.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "Copy", linkageName: "_CCopy.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !16)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{!15, !15}
+// CHECK:STDOUT: !15 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
 // CHECK:STDOUT: !16 = !{!17}
-// CHECK:STDOUT: !17 = !DILocalVariable(arg: 1, scope: !15, type: !10)
-// CHECK:STDOUT: !18 = !DILocation(line: 0, scope: !15)
+// CHECK:STDOUT: !17 = !DILocalVariable(arg: 1, scope: !12, type: !15)
+// CHECK:STDOUT: !18 = !DILocation(line: 7, column: 10, scope: !12)
+// CHECK:STDOUT: !19 = !DILocation(line: 7, column: 3, scope: !12)
+// CHECK:STDOUT: !20 = distinct !DISubprogram(name: "Op", linkageName: "_COp:thunk.Copy.Cpp", scope: null, file: !7, type: !13, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !21)
+// CHECK:STDOUT: !21 = !{!22}
+// CHECK:STDOUT: !22 = !DILocalVariable(arg: 1, scope: !20, type: !15)
+// CHECK:STDOUT: !23 = !DILocation(line: 0, scope: !20)
+// CHECK:STDOUT: !24 = !{!25, !25, i64 0}
+// CHECK:STDOUT: !25 = !{!"p1 _ZTS4Copy", !26, i64 0}
+// CHECK:STDOUT: !26 = !{!"any pointer", !10, i64 0}
+// CHECK:STDOUT: ; ModuleID = 'call_c1_in_thunk.carbon'
+// CHECK:STDOUT: source_filename = "call_c1_in_thunk.carbon"
+// CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
+// CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
+// CHECK:STDOUT:
+// CHECK:STDOUT: $_ZN7DerivedC1Ev = comdat any
+// CHECK:STDOUT:
+// CHECK:STDOUT: $_ZTV7Derived = comdat any
+// CHECK:STDOUT:
+// CHECK:STDOUT: $_ZTI7Derived = comdat any
+// CHECK:STDOUT:
+// CHECK:STDOUT: $_ZTS7Derived = comdat any
+// CHECK:STDOUT:
+// CHECK:STDOUT: $_ZTI4Base = comdat any
+// CHECK:STDOUT:
+// CHECK:STDOUT: $_ZTS4Base = comdat any
+// CHECK:STDOUT:
+// CHECK:STDOUT: @_ZTV7Derived = linkonce_odr dso_local unnamed_addr constant { [3 x ptr] } { [3 x ptr] [ptr null, ptr null, ptr @_ZTI7Derived] }, comdat, align 8
+// CHECK:STDOUT: @_ZTI7Derived = linkonce_odr dso_local constant { ptr, ptr, i32, i32, ptr, i64 } { ptr getelementptr inbounds (ptr, ptr @_ZTVN10__cxxabiv121__vmi_class_type_infoE, i64 2), ptr @_ZTS7Derived, i32 0, i32 1, ptr @_ZTI4Base, i64 -6141 }, comdat, align 8
+// CHECK:STDOUT: @_ZTVN10__cxxabiv121__vmi_class_type_infoE = external global [0 x ptr]
+// CHECK:STDOUT: @_ZTS7Derived = linkonce_odr dso_local constant [9 x i8] c"7Derived\00", comdat, align 1
+// CHECK:STDOUT: @_ZTI4Base = linkonce_odr dso_local constant { ptr, ptr } { ptr getelementptr inbounds (ptr, ptr @_ZTVN10__cxxabiv117__class_type_infoE, i64 2), ptr @_ZTS4Base }, comdat, align 8
+// CHECK:STDOUT: @_ZTVN10__cxxabiv117__class_type_infoE = external global [0 x ptr]
+// CHECK:STDOUT: @_ZTS4Base = linkonce_odr dso_local constant [6 x i8] c"4Base\00", comdat, align 1
+// CHECK:STDOUT:
+// CHECK:STDOUT: ; Function Attrs: nounwind
+// CHECK:STDOUT: define void @_CF.Main() #0 !dbg !12 {
+// CHECK:STDOUT: entry:
+// CHECK:STDOUT:   %.loc7_44.1.temp = alloca [8 x i8], align 1, !dbg !15
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc7_44.1.temp), !dbg !15
+// CHECK:STDOUT:   call void @_ZN7DerivedC1Ev.carbon_thunk(ptr %.loc7_44.1.temp), !dbg !15
+// CHECK:STDOUT:   ret void, !dbg !16
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
+// CHECK:STDOUT: declare void @llvm.lifetime.start.p0(ptr captures(none)) #1
+// CHECK:STDOUT:
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress nounwind uwtable
+// CHECK:STDOUT: define dso_local void @_ZN7DerivedC1Ev.carbon_thunk(ptr noundef %return) #2 {
+// CHECK:STDOUT: entry:
+// CHECK:STDOUT:   %return.addr = alloca ptr, align 8
+// CHECK:STDOUT:   store ptr %return, ptr %return.addr, align 8, !tbaa !17
+// CHECK:STDOUT:   %0 = load ptr, ptr %return.addr, align 8, !tbaa !17
+// CHECK:STDOUT:   call void @_ZN7DerivedC1Ev(ptr noundef nonnull align 8 dereferenceable(8) %0) #0
+// CHECK:STDOUT:   ret void
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: ; Function Attrs: inlinehint mustprogress nounwind uwtable
+// CHECK:STDOUT: define linkonce_odr dso_local void @_ZN7DerivedC1Ev(ptr noundef nonnull align 8 dereferenceable(8) %this) unnamed_addr #3 comdat align 2 {
+// CHECK:STDOUT: entry:
+// CHECK:STDOUT:   %this.addr = alloca ptr, align 8
+// CHECK:STDOUT:   store ptr %this, ptr %this.addr, align 8, !tbaa !17
+// CHECK:STDOUT:   %this1 = load ptr, ptr %this.addr, align 8
+// CHECK:STDOUT:   store ptr getelementptr inbounds inrange(-24, 0) ({ [3 x ptr] }, ptr @_ZTV7Derived, i32 0, i32 0, i32 3), ptr %this1, align 8, !tbaa !20
+// CHECK:STDOUT:   ret void
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: attributes #0 = { nounwind }
+// CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
+// CHECK:STDOUT: attributes #2 = { alwaysinline mustprogress nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #3 = { inlinehint mustprogress nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT:
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
+// CHECK:STDOUT:
+// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
+// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
+// CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
+// CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
+// CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "call_c1_in_thunk.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{null}
+// CHECK:STDOUT: !15 = !DILocation(line: 7, column: 24, scope: !12)
+// CHECK:STDOUT: !16 = !DILocation(line: 6, column: 1, scope: !12)
+// CHECK:STDOUT: !17 = !{!18, !18, i64 0}
+// CHECK:STDOUT: !18 = !{!"p1 _ZTS7Derived", !19, i64 0}
+// CHECK:STDOUT: !19 = !{!"any pointer", !10, i64 0}
+// CHECK:STDOUT: !20 = !{!21, !21, i64 0}
+// CHECK:STDOUT: !21 = !{!"vtable pointer", !11, i64 0}

toolchain/lower/testdata/interop/cpp/enum.carbon

@@ -88,91 +88,101 @@ fn Call() {
 // CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CPass.Main() #0 !dbg !7 {
+// CHECK:STDOUT: define void @_CPass.Main() #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc7_16.1.temp = alloca i16, align 2, !dbg !10
-// CHECK:STDOUT:   %.loc8_16.1.temp = alloca i16, align 2, !dbg !11
-// CHECK:STDOUT:   %.loc9_16.1.temp = alloca i16, align 2, !dbg !12
-// CHECK:STDOUT:   %.loc10_16.1.temp = alloca i16, align 2, !dbg !13
-// CHECK:STDOUT:   %.loc11_18.1.temp = alloca i16, align 2, !dbg !14
-// CHECK:STDOUT:   %.loc12_18.1.temp = alloca i16, align 2, !dbg !15
-// CHECK:STDOUT:   %.loc13_18.1.temp = alloca i16, align 2, !dbg !16
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc7_16.1.temp), !dbg !10
-// CHECK:STDOUT:   store i16 0, ptr %.loc7_16.1.temp, align 2, !dbg !10
-// CHECK:STDOUT:   call void @_ZN1C1FENS_1EE.carbon_thunk(ptr %.loc7_16.1.temp), !dbg !17
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc8_16.1.temp), !dbg !11
-// CHECK:STDOUT:   store i16 0, ptr %.loc8_16.1.temp, align 2, !dbg !11
-// CHECK:STDOUT:   call void @_ZN1C1FENS_1EE.carbon_thunk(ptr %.loc8_16.1.temp), !dbg !18
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc9_16.1.temp), !dbg !12
-// CHECK:STDOUT:   store i16 7, ptr %.loc9_16.1.temp, align 2, !dbg !12
-// CHECK:STDOUT:   call void @_ZN1C1FENS_1EE.carbon_thunk(ptr %.loc9_16.1.temp), !dbg !19
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc10_16.1.temp), !dbg !13
-// CHECK:STDOUT:   store i16 8, ptr %.loc10_16.1.temp, align 2, !dbg !13
-// CHECK:STDOUT:   call void @_ZN1C1FENS_1EE.carbon_thunk(ptr %.loc10_16.1.temp), !dbg !20
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc11_18.1.temp), !dbg !14
-// CHECK:STDOUT:   store i16 0, ptr %.loc11_18.1.temp, align 2, !dbg !14
-// CHECK:STDOUT:   call void @_ZN1C1FENS_1EE.carbon_thunk(ptr %.loc11_18.1.temp), !dbg !21
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc12_18.1.temp), !dbg !15
-// CHECK:STDOUT:   store i16 7, ptr %.loc12_18.1.temp, align 2, !dbg !15
-// CHECK:STDOUT:   call void @_ZN1C1FENS_1EE.carbon_thunk(ptr %.loc12_18.1.temp), !dbg !22
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc13_18.1.temp), !dbg !16
-// CHECK:STDOUT:   store i16 8, ptr %.loc13_18.1.temp, align 2, !dbg !16
-// CHECK:STDOUT:   call void @_ZN1C1FENS_1EE.carbon_thunk(ptr %.loc13_18.1.temp), !dbg !23
-// CHECK:STDOUT:   ret void, !dbg !24
+// CHECK:STDOUT:   %.loc7_16.1.temp = alloca i16, align 2, !dbg !15
+// CHECK:STDOUT:   %.loc8_16.1.temp = alloca i16, align 2, !dbg !16
+// CHECK:STDOUT:   %.loc9_16.1.temp = alloca i16, align 2, !dbg !17
+// CHECK:STDOUT:   %.loc10_16.1.temp = alloca i16, align 2, !dbg !18
+// CHECK:STDOUT:   %.loc11_18.1.temp = alloca i16, align 2, !dbg !19
+// CHECK:STDOUT:   %.loc12_18.1.temp = alloca i16, align 2, !dbg !20
+// CHECK:STDOUT:   %.loc13_18.1.temp = alloca i16, align 2, !dbg !21
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc7_16.1.temp), !dbg !15
+// CHECK:STDOUT:   store i16 0, ptr %.loc7_16.1.temp, align 2, !dbg !15
+// CHECK:STDOUT:   call void @_ZN1C1FENS_1EE.carbon_thunk(ptr %.loc7_16.1.temp), !dbg !22
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc8_16.1.temp), !dbg !16
+// CHECK:STDOUT:   store i16 0, ptr %.loc8_16.1.temp, align 2, !dbg !16
+// CHECK:STDOUT:   call void @_ZN1C1FENS_1EE.carbon_thunk(ptr %.loc8_16.1.temp), !dbg !23
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc9_16.1.temp), !dbg !17
+// CHECK:STDOUT:   store i16 7, ptr %.loc9_16.1.temp, align 2, !dbg !17
+// CHECK:STDOUT:   call void @_ZN1C1FENS_1EE.carbon_thunk(ptr %.loc9_16.1.temp), !dbg !24
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc10_16.1.temp), !dbg !18
+// CHECK:STDOUT:   store i16 8, ptr %.loc10_16.1.temp, align 2, !dbg !18
+// CHECK:STDOUT:   call void @_ZN1C1FENS_1EE.carbon_thunk(ptr %.loc10_16.1.temp), !dbg !25
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc11_18.1.temp), !dbg !19
+// CHECK:STDOUT:   store i16 0, ptr %.loc11_18.1.temp, align 2, !dbg !19
+// CHECK:STDOUT:   call void @_ZN1C1FENS_1EE.carbon_thunk(ptr %.loc11_18.1.temp), !dbg !26
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc12_18.1.temp), !dbg !20
+// CHECK:STDOUT:   store i16 7, ptr %.loc12_18.1.temp, align 2, !dbg !20
+// CHECK:STDOUT:   call void @_ZN1C1FENS_1EE.carbon_thunk(ptr %.loc12_18.1.temp), !dbg !27
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc13_18.1.temp), !dbg !21
+// CHECK:STDOUT:   store i16 8, ptr %.loc13_18.1.temp, align 2, !dbg !21
+// CHECK:STDOUT:   call void @_ZN1C1FENS_1EE.carbon_thunk(ptr %.loc13_18.1.temp), !dbg !28
+// CHECK:STDOUT:   ret void, !dbg !29
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
 // CHECK:STDOUT: declare void @llvm.lifetime.start.p0(ptr captures(none)) #1
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local void @_ZN1C1FENS_1EE.carbon_thunk(ptr %0) #2 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local void @_ZN1C1FENS_1EE.carbon_thunk(ptr noundef %0) #2 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %.addr = alloca ptr, align 8
-// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8
-// CHECK:STDOUT:   %1 = load ptr, ptr %.addr, align 8
-// CHECK:STDOUT:   %2 = load i16, ptr %1, align 2
-// CHECK:STDOUT:   call void @_ZN1C1FENS_1EE(i16 signext %2)
+// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8, !tbaa !30
+// CHECK:STDOUT:   %1 = load ptr, ptr %.addr, align 8, !tbaa !30
+// CHECK:STDOUT:   %2 = load i16, ptr %1, align 2, !tbaa !32
+// CHECK:STDOUT:   call void @_ZN1C1FENS_1EE(i16 noundef signext %2)
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare void @_ZN1C1FENS_1EE(i16 signext) #3
+// CHECK:STDOUT: declare void @_ZN1C1FENS_1EE(i16 noundef signext) #3
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; uselistorder directives
 // CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 6, 5, 4, 3, 2, 1, 0 }
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
-// CHECK:STDOUT: attributes #2 = { alwaysinline mustprogress "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
-// CHECK:STDOUT: attributes #3 = { "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #2 = { alwaysinline mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #3 = { "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "pass_as_arg.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "Pass", linkageName: "_CPass.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{null}
-// CHECK:STDOUT: !10 = !DILocation(line: 7, column: 11, scope: !7)
-// CHECK:STDOUT: !11 = !DILocation(line: 8, column: 11, scope: !7)
-// CHECK:STDOUT: !12 = !DILocation(line: 9, column: 11, scope: !7)
-// CHECK:STDOUT: !13 = !DILocation(line: 10, column: 11, scope: !7)
-// CHECK:STDOUT: !14 = !DILocation(line: 11, column: 11, scope: !7)
-// CHECK:STDOUT: !15 = !DILocation(line: 12, column: 11, scope: !7)
-// CHECK:STDOUT: !16 = !DILocation(line: 13, column: 11, scope: !7)
-// CHECK:STDOUT: !17 = !DILocation(line: 7, column: 3, scope: !7)
-// CHECK:STDOUT: !18 = !DILocation(line: 8, column: 3, scope: !7)
-// CHECK:STDOUT: !19 = !DILocation(line: 9, column: 3, scope: !7)
-// CHECK:STDOUT: !20 = !DILocation(line: 10, column: 3, scope: !7)
-// CHECK:STDOUT: !21 = !DILocation(line: 11, column: 3, scope: !7)
-// CHECK:STDOUT: !22 = !DILocation(line: 12, column: 3, scope: !7)
-// CHECK:STDOUT: !23 = !DILocation(line: 13, column: 3, scope: !7)
-// CHECK:STDOUT: !24 = !DILocation(line: 6, column: 1, scope: !7)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "pass_as_arg.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "Pass", linkageName: "_CPass.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{null}
+// CHECK:STDOUT: !15 = !DILocation(line: 7, column: 11, scope: !12)
+// CHECK:STDOUT: !16 = !DILocation(line: 8, column: 11, scope: !12)
+// CHECK:STDOUT: !17 = !DILocation(line: 9, column: 11, scope: !12)
+// CHECK:STDOUT: !18 = !DILocation(line: 10, column: 11, scope: !12)
+// CHECK:STDOUT: !19 = !DILocation(line: 11, column: 11, scope: !12)
+// CHECK:STDOUT: !20 = !DILocation(line: 12, column: 11, scope: !12)
+// CHECK:STDOUT: !21 = !DILocation(line: 13, column: 11, scope: !12)
+// CHECK:STDOUT: !22 = !DILocation(line: 7, column: 3, scope: !12)
+// CHECK:STDOUT: !23 = !DILocation(line: 8, column: 3, scope: !12)
+// CHECK:STDOUT: !24 = !DILocation(line: 9, column: 3, scope: !12)
+// CHECK:STDOUT: !25 = !DILocation(line: 10, column: 3, scope: !12)
+// CHECK:STDOUT: !26 = !DILocation(line: 11, column: 3, scope: !12)
+// CHECK:STDOUT: !27 = !DILocation(line: 12, column: 3, scope: !12)
+// CHECK:STDOUT: !28 = !DILocation(line: 13, column: 3, scope: !12)
+// CHECK:STDOUT: !29 = !DILocation(line: 6, column: 1, scope: !12)
+// CHECK:STDOUT: !30 = !{!31, !31, i64 0}
+// CHECK:STDOUT: !31 = !{!"any pointer", !10, i64 0}
+// CHECK:STDOUT: !32 = !{!33, !33, i64 0}
+// CHECK:STDOUT: !33 = !{!"_ZTSN1C1EE", !10, i64 0}
 // CHECK:STDOUT: ; ModuleID = 'convert.carbon'
 // CHECK:STDOUT: source_filename = "convert.carbon"
 // CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
@@ -181,107 +191,123 @@ fn Call() {
 // CHECK:STDOUT: declare void @_CTakeI16.Main(i16)
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CPassEnum.Main() #0 !dbg !7 {
+// CHECK:STDOUT: define void @_CPassEnum.Main() #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   call void @_CTakeI16.Main(i16 7), !dbg !10
-// CHECK:STDOUT:   ret void, !dbg !11
+// CHECK:STDOUT:   call void @_CTakeI16.Main(i16 7), !dbg !15
+// CHECK:STDOUT:   ret void, !dbg !16
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CConvertEnumToI16.Main(i16 %e) #0 !dbg !12 {
+// CHECK:STDOUT: define void @_CConvertEnumToI16.Main(i16 %e) #0 !dbg !17 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   call void @_CTakeI16.Main(i16 %e), !dbg !18
-// CHECK:STDOUT:   ret void, !dbg !19
+// CHECK:STDOUT:   call void @_CTakeI16.Main(i16 %e), !dbg !23
+// CHECK:STDOUT:   ret void, !dbg !24
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CConvertI16ToEnum.Main(i16 %n) #0 !dbg !20 {
+// CHECK:STDOUT: define void @_CConvertI16ToEnum.Main(i16 %n) #0 !dbg !25 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc17_13.3.temp = alloca i16, align 2, !dbg !23
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc17_13.3.temp), !dbg !23
-// CHECK:STDOUT:   store i16 %n, ptr %.loc17_13.3.temp, align 2, !dbg !23
-// CHECK:STDOUT:   call void @_ZN1C1FENS_1EE.carbon_thunk(ptr %.loc17_13.3.temp), !dbg !24
-// CHECK:STDOUT:   ret void, !dbg !25
+// CHECK:STDOUT:   %.loc17_13.3.temp = alloca i16, align 2, !dbg !28
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc17_13.3.temp), !dbg !28
+// CHECK:STDOUT:   store i16 %n, ptr %.loc17_13.3.temp, align 2, !dbg !28
+// CHECK:STDOUT:   call void @_ZN1C1FENS_1EE.carbon_thunk(ptr %.loc17_13.3.temp), !dbg !29
+// CHECK:STDOUT:   ret void, !dbg !30
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
 // CHECK:STDOUT: declare void @llvm.lifetime.start.p0(ptr captures(none)) #1
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local void @_ZN1C1FENS_1EE.carbon_thunk(ptr %0) #2 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local void @_ZN1C1FENS_1EE.carbon_thunk(ptr noundef %0) #2 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %.addr = alloca ptr, align 8
-// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8
-// CHECK:STDOUT:   %1 = load ptr, ptr %.addr, align 8
-// CHECK:STDOUT:   %2 = load i16, ptr %1, align 2
-// CHECK:STDOUT:   call void @_ZN1C1FENS_1EE(i16 signext %2)
+// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8, !tbaa !31
+// CHECK:STDOUT:   %1 = load ptr, ptr %.addr, align 8, !tbaa !31
+// CHECK:STDOUT:   %2 = load i16, ptr %1, align 2, !tbaa !33
+// CHECK:STDOUT:   call void @_ZN1C1FENS_1EE(i16 noundef signext %2)
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare void @_ZN1C1FENS_1EE(i16 signext) #3
+// CHECK:STDOUT: declare void @_ZN1C1FENS_1EE(i16 noundef signext) #3
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
-// CHECK:STDOUT: attributes #2 = { alwaysinline mustprogress "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
-// CHECK:STDOUT: attributes #3 = { "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #2 = { alwaysinline mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #3 = { "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "convert.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "PassEnum", linkageName: "_CPassEnum.Main", scope: null, file: !6, line: 8, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{null}
-// CHECK:STDOUT: !10 = !DILocation(line: 9, column: 3, scope: !7)
-// CHECK:STDOUT: !11 = !DILocation(line: 8, column: 1, scope: !7)
-// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "ConvertEnumToI16", linkageName: "_CConvertEnumToI16.Main", scope: null, file: !6, line: 12, type: !13, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !16)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "convert.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "PassEnum", linkageName: "_CPassEnum.Main", scope: null, file: !7, line: 8, type: !13, spFlags: DISPFlagDefinition, unit: !6)
 // CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
-// CHECK:STDOUT: !14 = !{null, !15}
-// CHECK:STDOUT: !15 = !DIBasicType(name: "int", size: 16, encoding: DW_ATE_signed)
-// CHECK:STDOUT: !16 = !{!17}
-// CHECK:STDOUT: !17 = !DILocalVariable(arg: 1, scope: !12, type: !15)
-// CHECK:STDOUT: !18 = !DILocation(line: 13, column: 3, scope: !12)
-// CHECK:STDOUT: !19 = !DILocation(line: 12, column: 1, scope: !12)
-// CHECK:STDOUT: !20 = distinct !DISubprogram(name: "ConvertI16ToEnum", linkageName: "_CConvertI16ToEnum.Main", scope: null, file: !6, line: 16, type: !13, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !21)
+// CHECK:STDOUT: !14 = !{null}
+// CHECK:STDOUT: !15 = !DILocation(line: 9, column: 3, scope: !12)
+// CHECK:STDOUT: !16 = !DILocation(line: 8, column: 1, scope: !12)
+// CHECK:STDOUT: !17 = distinct !DISubprogram(name: "ConvertEnumToI16", linkageName: "_CConvertEnumToI16.Main", scope: null, file: !7, line: 12, type: !18, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !21)
+// CHECK:STDOUT: !18 = !DISubroutineType(types: !19)
+// CHECK:STDOUT: !19 = !{null, !20}
+// CHECK:STDOUT: !20 = !DIBasicType(name: "int", size: 16, encoding: DW_ATE_signed)
 // CHECK:STDOUT: !21 = !{!22}
-// CHECK:STDOUT: !22 = !DILocalVariable(arg: 1, scope: !20, type: !15)
-// CHECK:STDOUT: !23 = !DILocation(line: 17, column: 11, scope: !20)
-// CHECK:STDOUT: !24 = !DILocation(line: 17, column: 3, scope: !20)
-// CHECK:STDOUT: !25 = !DILocation(line: 16, column: 1, scope: !20)
+// CHECK:STDOUT: !22 = !DILocalVariable(arg: 1, scope: !17, type: !20)
+// CHECK:STDOUT: !23 = !DILocation(line: 13, column: 3, scope: !17)
+// CHECK:STDOUT: !24 = !DILocation(line: 12, column: 1, scope: !17)
+// CHECK:STDOUT: !25 = distinct !DISubprogram(name: "ConvertI16ToEnum", linkageName: "_CConvertI16ToEnum.Main", scope: null, file: !7, line: 16, type: !18, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !26)
+// CHECK:STDOUT: !26 = !{!27}
+// CHECK:STDOUT: !27 = !DILocalVariable(arg: 1, scope: !25, type: !20)
+// CHECK:STDOUT: !28 = !DILocation(line: 17, column: 11, scope: !25)
+// CHECK:STDOUT: !29 = !DILocation(line: 17, column: 3, scope: !25)
+// CHECK:STDOUT: !30 = !DILocation(line: 16, column: 1, scope: !25)
+// CHECK:STDOUT: !31 = !{!32, !32, i64 0}
+// CHECK:STDOUT: !32 = !{!"any pointer", !10, i64 0}
+// CHECK:STDOUT: !33 = !{!34, !34, i64 0}
+// CHECK:STDOUT: !34 = !{!"_ZTSN1C1EE", !10, i64 0}
 // CHECK:STDOUT: ; ModuleID = 'use_bitmask.carbon'
 // CHECK:STDOUT: source_filename = "use_bitmask.carbon"
 // CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
 // CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CCall.Main() #0 !dbg !7 {
+// CHECK:STDOUT: define void @_CCall.Main() #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   call void @_Z4Take4Bits(i32 5), !dbg !10
-// CHECK:STDOUT:   ret void, !dbg !11
+// CHECK:STDOUT:   call void @_Z4Take4Bits(i32 5), !dbg !15
+// CHECK:STDOUT:   ret void, !dbg !16
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: declare void @_Z4Take4Bits(i32)
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "use_bitmask.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "Call", linkageName: "_CCall.Main", scope: null, file: !6, line: 10, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{null}
-// CHECK:STDOUT: !10 = !DILocation(line: 11, column: 3, scope: !7)
-// CHECK:STDOUT: !11 = !DILocation(line: 10, column: 1, scope: !7)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "use_bitmask.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "Call", linkageName: "_CCall.Main", scope: null, file: !7, line: 10, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{null}
+// CHECK:STDOUT: !15 = !DILocation(line: 11, column: 3, scope: !12)
+// CHECK:STDOUT: !16 = !DILocation(line: 10, column: 1, scope: !12)

toolchain/lower/testdata/interop/cpp/extern_c.carbon

@@ -108,42 +108,48 @@ fn MyF() {
 // CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CMyF.Main() #0 !dbg !7 {
+// CHECK:STDOUT: define void @_CMyF.Main() #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   call void @foo(), !dbg !10
-// CHECK:STDOUT:   ret void, !dbg !11
+// CHECK:STDOUT:   call void @foo(), !dbg !15
+// CHECK:STDOUT:   ret void, !dbg !16
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: declare void @foo()
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "import_extern_c_function.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{null}
-// CHECK:STDOUT: !10 = !DILocation(line: 7, column: 3, scope: !7)
-// CHECK:STDOUT: !11 = !DILocation(line: 6, column: 1, scope: !7)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "import_extern_c_function.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{null}
+// CHECK:STDOUT: !15 = !DILocation(line: 7, column: 3, scope: !12)
+// CHECK:STDOUT: !16 = !DILocation(line: 6, column: 1, scope: !12)
 // CHECK:STDOUT: ; ModuleID = 'extern_c_function_with_cpp_overload_set.carbon'
 // CHECK:STDOUT: source_filename = "extern_c_function_with_cpp_overload_set.carbon"
 // CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
 // CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CMyF.Main() #0 !dbg !7 {
+// CHECK:STDOUT: define void @_CMyF.Main() #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   call void @foo(), !dbg !10
-// CHECK:STDOUT:   call void @_Z3fooi(i32 5), !dbg !11
-// CHECK:STDOUT:   ret void, !dbg !12
+// CHECK:STDOUT:   call void @foo(), !dbg !15
+// CHECK:STDOUT:   call void @_Z3fooi(i32 5), !dbg !16
+// CHECK:STDOUT:   ret void, !dbg !17
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: declare void @foo()
@@ -152,22 +158,28 @@ fn MyF() {
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "extern_c_function_with_cpp_overload_set.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !6, line: 9, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{null}
-// CHECK:STDOUT: !10 = !DILocation(line: 10, column: 3, scope: !7)
-// CHECK:STDOUT: !11 = !DILocation(line: 11, column: 3, scope: !7)
-// CHECK:STDOUT: !12 = !DILocation(line: 9, column: 1, scope: !7)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "extern_c_function_with_cpp_overload_set.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !7, line: 9, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{null}
+// CHECK:STDOUT: !15 = !DILocation(line: 10, column: 3, scope: !12)
+// CHECK:STDOUT: !16 = !DILocation(line: 11, column: 3, scope: !12)
+// CHECK:STDOUT: !17 = !DILocation(line: 9, column: 1, scope: !12)
 // CHECK:STDOUT: ; ModuleID = 'import_extern_c_variable.carbon'
 // CHECK:STDOUT: source_filename = "import_extern_c_variable.carbon"
 // CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
@@ -176,30 +188,36 @@ fn MyF() {
 // CHECK:STDOUT: @foo = external global i32
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define i32 @_CMyF.Main() #0 !dbg !7 {
+// CHECK:STDOUT: define i32 @_CMyF.Main() #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc7 = load i32, ptr @foo, align 4, !dbg !11
-// CHECK:STDOUT:   ret i32 %.loc7, !dbg !12
+// CHECK:STDOUT:   %.loc7 = load i32, ptr @foo, align 4, !dbg !16
+// CHECK:STDOUT:   ret i32 %.loc7, !dbg !17
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "import_extern_c_variable.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{!10}
-// CHECK:STDOUT: !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
-// CHECK:STDOUT: !11 = !DILocation(line: 7, column: 10, scope: !7)
-// CHECK:STDOUT: !12 = !DILocation(line: 7, column: 3, scope: !7)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "import_extern_c_variable.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{!15}
+// CHECK:STDOUT: !15 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+// CHECK:STDOUT: !16 = !DILocation(line: 7, column: 10, scope: !12)
+// CHECK:STDOUT: !17 = !DILocation(line: 7, column: 3, scope: !12)
 // CHECK:STDOUT: ; ModuleID = 'import_extern_c_with_special_name.carbon'
 // CHECK:STDOUT: source_filename = "import_extern_c_with_special_name.carbon"
 // CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
@@ -208,14 +226,14 @@ fn MyF() {
 // CHECK:STDOUT: %struct.X = type { i8 }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CMyF.Main(ptr sret({}) %return, ptr %a, ptr %b) #0 !dbg !7 {
+// CHECK:STDOUT: define void @_CMyF.Main(ptr sret({}) %return, ptr %a, ptr %b) #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   call void @_Zpl1XS_.carbon_thunk(ptr %a, ptr %b, ptr %return), !dbg !14
-// CHECK:STDOUT:   ret void, !dbg !15
+// CHECK:STDOUT:   call void @_Zpl1XS_.carbon_thunk(ptr %a, ptr %b, ptr %return), !dbg !19
+// CHECK:STDOUT:   ret void, !dbg !20
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local void @_Zpl1XS_.carbon_thunk(ptr %0, ptr %1, ptr %return) #1 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local void @_Zpl1XS_.carbon_thunk(ptr noundef %0, ptr noundef %1, ptr noundef %return) #1 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %.addr = alloca ptr, align 8
 // CHECK:STDOUT:   %.addr1 = alloca ptr, align 8
@@ -223,12 +241,12 @@ fn MyF() {
 // CHECK:STDOUT:   %agg.tmp = alloca %struct.X, align 1
 // CHECK:STDOUT:   %agg.tmp2 = alloca %struct.X, align 1
 // CHECK:STDOUT:   %undef.agg.tmp = alloca %struct.X, align 1
-// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8
-// CHECK:STDOUT:   store ptr %1, ptr %.addr1, align 8
-// CHECK:STDOUT:   store ptr %return, ptr %return.addr, align 8
-// CHECK:STDOUT:   %2 = load ptr, ptr %return.addr, align 8
-// CHECK:STDOUT:   %3 = load ptr, ptr %.addr, align 8
-// CHECK:STDOUT:   %4 = load ptr, ptr %.addr1, align 8
+// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8, !tbaa !21
+// CHECK:STDOUT:   store ptr %1, ptr %.addr1, align 8, !tbaa !21
+// CHECK:STDOUT:   store ptr %return, ptr %return.addr, align 8, !tbaa !21
+// CHECK:STDOUT:   %2 = load ptr, ptr %return.addr, align 8, !tbaa !21
+// CHECK:STDOUT:   %3 = load ptr, ptr %.addr, align 8, !tbaa !21
+// CHECK:STDOUT:   %4 = load ptr, ptr %.addr1, align 8, !tbaa !21
 // CHECK:STDOUT:   call void @_Zpl1XS_()
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
@@ -236,56 +254,71 @@ fn MyF() {
 // CHECK:STDOUT: declare void @_Zpl1XS_() #2
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
-// CHECK:STDOUT: attributes #1 = { alwaysinline mustprogress "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
-// CHECK:STDOUT: attributes #2 = { "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #1 = { alwaysinline mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #2 = { "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "import_extern_c_with_special_name.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !11)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{!10, !10, !10}
-// CHECK:STDOUT: !10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
-// CHECK:STDOUT: !11 = !{!12, !13}
-// CHECK:STDOUT: !12 = !DILocalVariable(arg: 1, scope: !7, type: !10)
-// CHECK:STDOUT: !13 = !DILocalVariable(arg: 2, scope: !7, type: !10)
-// CHECK:STDOUT: !14 = !DILocation(line: 7, column: 10, scope: !7)
-// CHECK:STDOUT: !15 = !DILocation(line: 7, column: 3, scope: !7)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "import_extern_c_with_special_name.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !16)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{!15, !15, !15}
+// CHECK:STDOUT: !15 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
+// CHECK:STDOUT: !16 = !{!17, !18}
+// CHECK:STDOUT: !17 = !DILocalVariable(arg: 1, scope: !12, type: !15)
+// CHECK:STDOUT: !18 = !DILocalVariable(arg: 2, scope: !12, type: !15)
+// CHECK:STDOUT: !19 = !DILocation(line: 7, column: 10, scope: !12)
+// CHECK:STDOUT: !20 = !DILocation(line: 7, column: 3, scope: !12)
+// CHECK:STDOUT: !21 = !{!22, !22, i64 0}
+// CHECK:STDOUT: !22 = !{!"p1 _ZTS1X", !23, i64 0}
+// CHECK:STDOUT: !23 = !{!"any pointer", !10, i64 0}
 // CHECK:STDOUT: ; ModuleID = 'import_extern_c_with_asm_label.carbon'
 // CHECK:STDOUT: source_filename = "import_extern_c_with_asm_label.carbon"
 // CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
 // CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CMyF.Main() #0 !dbg !7 {
+// CHECK:STDOUT: define void @_CMyF.Main() #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   call void @bar(), !dbg !10
-// CHECK:STDOUT:   ret void, !dbg !11
+// CHECK:STDOUT:   call void @bar(), !dbg !15
+// CHECK:STDOUT:   ret void, !dbg !16
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: declare void @bar()
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "import_extern_c_with_asm_label.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{null}
-// CHECK:STDOUT: !10 = !DILocation(line: 7, column: 3, scope: !7)
-// CHECK:STDOUT: !11 = !DILocation(line: 6, column: 1, scope: !7)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "import_extern_c_with_asm_label.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{null}
+// CHECK:STDOUT: !15 = !DILocation(line: 7, column: 3, scope: !12)
+// CHECK:STDOUT: !16 = !DILocation(line: 6, column: 1, scope: !12)

toolchain/lower/testdata/interop/cpp/field.carbon

@@ -114,232 +114,262 @@ fn AccessP(a: Cpp.A) -> i32 {
 // CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define i32 @_CAccessN.Main(ptr %a) #0 !dbg !7 {
+// CHECK:STDOUT: define i32 @_CAccessN.Main(ptr %a) #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc9_11.1.n = getelementptr inbounds nuw [32 x i8], ptr %a, i32 0, i32 0, !dbg !14
-// CHECK:STDOUT:   %.loc9_11.2 = load i32, ptr %.loc9_11.1.n, align 4, !dbg !14
-// CHECK:STDOUT:   ret i32 %.loc9_11.2, !dbg !15
+// CHECK:STDOUT:   %.loc9_11.1.n = getelementptr inbounds nuw [32 x i8], ptr %a, i32 0, i32 0, !dbg !19
+// CHECK:STDOUT:   %.loc9_11.2 = load i32, ptr %.loc9_11.1.n, align 4, !dbg !19
+// CHECK:STDOUT:   ret i32 %.loc9_11.2, !dbg !20
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define i32 @_CAccessM.Main(ptr %a) #0 !dbg !16 {
+// CHECK:STDOUT: define i32 @_CAccessM.Main(ptr %a) #0 !dbg !21 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc13_11.1.m = getelementptr inbounds nuw [32 x i8], ptr %a, i32 0, i32 16, !dbg !19
-// CHECK:STDOUT:   %.loc13_11.2 = load i32, ptr %.loc13_11.1.m, align 4, !dbg !19
-// CHECK:STDOUT:   ret i32 %.loc13_11.2, !dbg !20
+// CHECK:STDOUT:   %.loc13_11.1.m = getelementptr inbounds nuw [32 x i8], ptr %a, i32 0, i32 16, !dbg !24
+// CHECK:STDOUT:   %.loc13_11.2 = load i32, ptr %.loc13_11.1.m, align 4, !dbg !24
+// CHECK:STDOUT:   ret i32 %.loc13_11.2, !dbg !25
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "access_struct.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "AccessN", linkageName: "_CAccessN.Main", scope: null, file: !6, line: 8, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !12)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{!10, !11}
-// CHECK:STDOUT: !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
-// CHECK:STDOUT: !11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
-// CHECK:STDOUT: !12 = !{!13}
-// CHECK:STDOUT: !13 = !DILocalVariable(arg: 1, scope: !7, type: !11)
-// CHECK:STDOUT: !14 = !DILocation(line: 9, column: 10, scope: !7)
-// CHECK:STDOUT: !15 = !DILocation(line: 9, column: 3, scope: !7)
-// CHECK:STDOUT: !16 = distinct !DISubprogram(name: "AccessM", linkageName: "_CAccessM.Main", scope: null, file: !6, line: 12, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !17)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "access_struct.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "AccessN", linkageName: "_CAccessN.Main", scope: null, file: !7, line: 8, type: !13, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !17)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{!15, !16}
+// CHECK:STDOUT: !15 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+// CHECK:STDOUT: !16 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
 // CHECK:STDOUT: !17 = !{!18}
-// CHECK:STDOUT: !18 = !DILocalVariable(arg: 1, scope: !16, type: !11)
-// CHECK:STDOUT: !19 = !DILocation(line: 13, column: 10, scope: !16)
-// CHECK:STDOUT: !20 = !DILocation(line: 13, column: 3, scope: !16)
+// CHECK:STDOUT: !18 = !DILocalVariable(arg: 1, scope: !12, type: !16)
+// CHECK:STDOUT: !19 = !DILocation(line: 9, column: 10, scope: !12)
+// CHECK:STDOUT: !20 = !DILocation(line: 9, column: 3, scope: !12)
+// CHECK:STDOUT: !21 = distinct !DISubprogram(name: "AccessM", linkageName: "_CAccessM.Main", scope: null, file: !7, line: 12, type: !13, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !22)
+// CHECK:STDOUT: !22 = !{!23}
+// CHECK:STDOUT: !23 = !DILocalVariable(arg: 1, scope: !21, type: !16)
+// CHECK:STDOUT: !24 = !DILocation(line: 13, column: 10, scope: !21)
+// CHECK:STDOUT: !25 = !DILocation(line: 13, column: 3, scope: !21)
 // CHECK:STDOUT: ; ModuleID = 'assign_struct.carbon'
 // CHECK:STDOUT: source_filename = "assign_struct.carbon"
 // CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
 // CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CAssignN.Main(ptr %p) #0 !dbg !7 {
+// CHECK:STDOUT: define void @_CAssignN.Main(ptr %p) #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc9_4.2.n = getelementptr inbounds nuw [32 x i8], ptr %p, i32 0, i32 0, !dbg !13
-// CHECK:STDOUT:   store i32 1, ptr %.loc9_4.2.n, align 4, !dbg !13
-// CHECK:STDOUT:   ret void, !dbg !14
+// CHECK:STDOUT:   %.loc9_4.2.n = getelementptr inbounds nuw [32 x i8], ptr %p, i32 0, i32 0, !dbg !18
+// CHECK:STDOUT:   store i32 1, ptr %.loc9_4.2.n, align 4, !dbg !18
+// CHECK:STDOUT:   ret void, !dbg !19
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CAssignM.Main(ptr %p) #0 !dbg !15 {
+// CHECK:STDOUT: define void @_CAssignM.Main(ptr %p) #0 !dbg !20 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc13_4.2.m = getelementptr inbounds nuw [32 x i8], ptr %p, i32 0, i32 16, !dbg !18
-// CHECK:STDOUT:   store i32 1, ptr %.loc13_4.2.m, align 4, !dbg !18
-// CHECK:STDOUT:   ret void, !dbg !19
+// CHECK:STDOUT:   %.loc13_4.2.m = getelementptr inbounds nuw [32 x i8], ptr %p, i32 0, i32 16, !dbg !23
+// CHECK:STDOUT:   store i32 1, ptr %.loc13_4.2.m, align 4, !dbg !23
+// CHECK:STDOUT:   ret void, !dbg !24
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "assign_struct.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "AssignN", linkageName: "_CAssignN.Main", scope: null, file: !6, line: 8, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !11)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{null, !10}
-// CHECK:STDOUT: !10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
-// CHECK:STDOUT: !11 = !{!12}
-// CHECK:STDOUT: !12 = !DILocalVariable(arg: 1, scope: !7, type: !10)
-// CHECK:STDOUT: !13 = !DILocation(line: 9, column: 3, scope: !7)
-// CHECK:STDOUT: !14 = !DILocation(line: 8, column: 1, scope: !7)
-// CHECK:STDOUT: !15 = distinct !DISubprogram(name: "AssignM", linkageName: "_CAssignM.Main", scope: null, file: !6, line: 12, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !16)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "assign_struct.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "AssignN", linkageName: "_CAssignN.Main", scope: null, file: !7, line: 8, type: !13, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !16)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{null, !15}
+// CHECK:STDOUT: !15 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
 // CHECK:STDOUT: !16 = !{!17}
-// CHECK:STDOUT: !17 = !DILocalVariable(arg: 1, scope: !15, type: !10)
-// CHECK:STDOUT: !18 = !DILocation(line: 13, column: 3, scope: !15)
-// CHECK:STDOUT: !19 = !DILocation(line: 12, column: 1, scope: !15)
+// CHECK:STDOUT: !17 = !DILocalVariable(arg: 1, scope: !12, type: !15)
+// CHECK:STDOUT: !18 = !DILocation(line: 9, column: 3, scope: !12)
+// CHECK:STDOUT: !19 = !DILocation(line: 8, column: 1, scope: !12)
+// CHECK:STDOUT: !20 = distinct !DISubprogram(name: "AssignM", linkageName: "_CAssignM.Main", scope: null, file: !7, line: 12, type: !13, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !21)
+// CHECK:STDOUT: !21 = !{!22}
+// CHECK:STDOUT: !22 = !DILocalVariable(arg: 1, scope: !20, type: !15)
+// CHECK:STDOUT: !23 = !DILocation(line: 13, column: 3, scope: !20)
+// CHECK:STDOUT: !24 = !DILocation(line: 12, column: 1, scope: !20)
 // CHECK:STDOUT: ; ModuleID = 'access_union.carbon'
 // CHECK:STDOUT: source_filename = "access_union.carbon"
 // CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
 // CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define i32 @_CAccessN.Main(ptr %a) #0 !dbg !7 {
+// CHECK:STDOUT: define i32 @_CAccessN.Main(ptr %a) #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc7_11.1.n = getelementptr inbounds nuw [4 x i8], ptr %a, i32 0, i32 0, !dbg !14
-// CHECK:STDOUT:   %.loc7_11.2 = load i32, ptr %.loc7_11.1.n, align 4, !dbg !14
-// CHECK:STDOUT:   ret i32 %.loc7_11.2, !dbg !15
+// CHECK:STDOUT:   %.loc7_11.1.n = getelementptr inbounds nuw [4 x i8], ptr %a, i32 0, i32 0, !dbg !19
+// CHECK:STDOUT:   %.loc7_11.2 = load i32, ptr %.loc7_11.1.n, align 4, !dbg !19
+// CHECK:STDOUT:   ret i32 %.loc7_11.2, !dbg !20
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define i32 @_CAccessM.Main(ptr %a) #0 !dbg !16 {
+// CHECK:STDOUT: define i32 @_CAccessM.Main(ptr %a) #0 !dbg !21 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc11_11.1.m = getelementptr inbounds nuw [4 x i8], ptr %a, i32 0, i32 0, !dbg !19
-// CHECK:STDOUT:   %.loc11_11.2 = load i32, ptr %.loc11_11.1.m, align 4, !dbg !19
-// CHECK:STDOUT:   ret i32 %.loc11_11.2, !dbg !20
+// CHECK:STDOUT:   %.loc11_11.1.m = getelementptr inbounds nuw [4 x i8], ptr %a, i32 0, i32 0, !dbg !24
+// CHECK:STDOUT:   %.loc11_11.2 = load i32, ptr %.loc11_11.1.m, align 4, !dbg !24
+// CHECK:STDOUT:   ret i32 %.loc11_11.2, !dbg !25
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "access_union.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "AccessN", linkageName: "_CAccessN.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !12)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{!10, !11}
-// CHECK:STDOUT: !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
-// CHECK:STDOUT: !11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
-// CHECK:STDOUT: !12 = !{!13}
-// CHECK:STDOUT: !13 = !DILocalVariable(arg: 1, scope: !7, type: !11)
-// CHECK:STDOUT: !14 = !DILocation(line: 7, column: 10, scope: !7)
-// CHECK:STDOUT: !15 = !DILocation(line: 7, column: 3, scope: !7)
-// CHECK:STDOUT: !16 = distinct !DISubprogram(name: "AccessM", linkageName: "_CAccessM.Main", scope: null, file: !6, line: 10, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !17)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "access_union.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "AccessN", linkageName: "_CAccessN.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !17)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{!15, !16}
+// CHECK:STDOUT: !15 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+// CHECK:STDOUT: !16 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
 // CHECK:STDOUT: !17 = !{!18}
-// CHECK:STDOUT: !18 = !DILocalVariable(arg: 1, scope: !16, type: !11)
-// CHECK:STDOUT: !19 = !DILocation(line: 11, column: 10, scope: !16)
-// CHECK:STDOUT: !20 = !DILocation(line: 11, column: 3, scope: !16)
+// CHECK:STDOUT: !18 = !DILocalVariable(arg: 1, scope: !12, type: !16)
+// CHECK:STDOUT: !19 = !DILocation(line: 7, column: 10, scope: !12)
+// CHECK:STDOUT: !20 = !DILocation(line: 7, column: 3, scope: !12)
+// CHECK:STDOUT: !21 = distinct !DISubprogram(name: "AccessM", linkageName: "_CAccessM.Main", scope: null, file: !7, line: 10, type: !13, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !22)
+// CHECK:STDOUT: !22 = !{!23}
+// CHECK:STDOUT: !23 = !DILocalVariable(arg: 1, scope: !21, type: !16)
+// CHECK:STDOUT: !24 = !DILocation(line: 11, column: 10, scope: !21)
+// CHECK:STDOUT: !25 = !DILocation(line: 11, column: 3, scope: !21)
 // CHECK:STDOUT: ; ModuleID = 'assign_union.carbon'
 // CHECK:STDOUT: source_filename = "assign_union.carbon"
 // CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
 // CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CAssignN.Main(ptr %p) #0 !dbg !7 {
+// CHECK:STDOUT: define void @_CAssignN.Main(ptr %p) #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc7_4.2.n = getelementptr inbounds nuw [4 x i8], ptr %p, i32 0, i32 0, !dbg !13
-// CHECK:STDOUT:   store i32 1, ptr %.loc7_4.2.n, align 4, !dbg !13
-// CHECK:STDOUT:   ret void, !dbg !14
+// CHECK:STDOUT:   %.loc7_4.2.n = getelementptr inbounds nuw [4 x i8], ptr %p, i32 0, i32 0, !dbg !18
+// CHECK:STDOUT:   store i32 1, ptr %.loc7_4.2.n, align 4, !dbg !18
+// CHECK:STDOUT:   ret void, !dbg !19
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CAssignM.Main(ptr %p) #0 !dbg !15 {
+// CHECK:STDOUT: define void @_CAssignM.Main(ptr %p) #0 !dbg !20 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc11_4.2.m = getelementptr inbounds nuw [4 x i8], ptr %p, i32 0, i32 0, !dbg !18
-// CHECK:STDOUT:   store i32 1, ptr %.loc11_4.2.m, align 4, !dbg !18
-// CHECK:STDOUT:   ret void, !dbg !19
+// CHECK:STDOUT:   %.loc11_4.2.m = getelementptr inbounds nuw [4 x i8], ptr %p, i32 0, i32 0, !dbg !23
+// CHECK:STDOUT:   store i32 1, ptr %.loc11_4.2.m, align 4, !dbg !23
+// CHECK:STDOUT:   ret void, !dbg !24
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "assign_union.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "AssignN", linkageName: "_CAssignN.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !11)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{null, !10}
-// CHECK:STDOUT: !10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
-// CHECK:STDOUT: !11 = !{!12}
-// CHECK:STDOUT: !12 = !DILocalVariable(arg: 1, scope: !7, type: !10)
-// CHECK:STDOUT: !13 = !DILocation(line: 7, column: 3, scope: !7)
-// CHECK:STDOUT: !14 = !DILocation(line: 6, column: 1, scope: !7)
-// CHECK:STDOUT: !15 = distinct !DISubprogram(name: "AssignM", linkageName: "_CAssignM.Main", scope: null, file: !6, line: 10, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !16)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "assign_union.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "AssignN", linkageName: "_CAssignN.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !16)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{null, !15}
+// CHECK:STDOUT: !15 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
 // CHECK:STDOUT: !16 = !{!17}
-// CHECK:STDOUT: !17 = !DILocalVariable(arg: 1, scope: !15, type: !10)
-// CHECK:STDOUT: !18 = !DILocation(line: 11, column: 3, scope: !15)
-// CHECK:STDOUT: !19 = !DILocation(line: 10, column: 1, scope: !15)
+// CHECK:STDOUT: !17 = !DILocalVariable(arg: 1, scope: !12, type: !15)
+// CHECK:STDOUT: !18 = !DILocation(line: 7, column: 3, scope: !12)
+// CHECK:STDOUT: !19 = !DILocation(line: 6, column: 1, scope: !12)
+// CHECK:STDOUT: !20 = distinct !DISubprogram(name: "AssignM", linkageName: "_CAssignM.Main", scope: null, file: !7, line: 10, type: !13, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !21)
+// CHECK:STDOUT: !21 = !{!22}
+// CHECK:STDOUT: !22 = !DILocalVariable(arg: 1, scope: !20, type: !15)
+// CHECK:STDOUT: !23 = !DILocation(line: 11, column: 3, scope: !20)
+// CHECK:STDOUT: !24 = !DILocation(line: 10, column: 1, scope: !20)
 // CHECK:STDOUT: ; ModuleID = 'access_anon_union.carbon'
 // CHECK:STDOUT: source_filename = "access_anon_union.carbon"
 // CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
 // CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define i32 @_CAccessN.Main(ptr %a) #0 !dbg !7 {
+// CHECK:STDOUT: define i32 @_CAccessN.Main(ptr %a) #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc7_11.1.n = getelementptr inbounds nuw [16 x i8], ptr %a, i32 0, i32 8, !dbg !14
-// CHECK:STDOUT:   %.loc7_11.2 = load i32, ptr %.loc7_11.1.n, align 4, !dbg !14
-// CHECK:STDOUT:   ret i32 %.loc7_11.2, !dbg !15
+// CHECK:STDOUT:   %.loc7_11.1.n = getelementptr inbounds nuw [16 x i8], ptr %a, i32 0, i32 8, !dbg !19
+// CHECK:STDOUT:   %.loc7_11.2 = load i32, ptr %.loc7_11.1.n, align 4, !dbg !19
+// CHECK:STDOUT:   ret i32 %.loc7_11.2, !dbg !20
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define i32 @_CAccessP.Main(ptr %a) #0 !dbg !16 {
+// CHECK:STDOUT: define i32 @_CAccessP.Main(ptr %a) #0 !dbg !21 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc11_12.1.p = getelementptr inbounds nuw [16 x i8], ptr %a, i32 0, i32 8, !dbg !19
-// CHECK:STDOUT:   %.loc11_12.2 = load ptr, ptr %.loc11_12.1.p, align 8, !dbg !19
-// CHECK:STDOUT:   %.loc11_10.2 = load i32, ptr %.loc11_12.2, align 4, !dbg !20
-// CHECK:STDOUT:   ret i32 %.loc11_10.2, !dbg !21
+// CHECK:STDOUT:   %.loc11_12.1.p = getelementptr inbounds nuw [16 x i8], ptr %a, i32 0, i32 8, !dbg !24
+// CHECK:STDOUT:   %.loc11_12.2 = load ptr, ptr %.loc11_12.1.p, align 8, !dbg !24
+// CHECK:STDOUT:   %.loc11_10.2 = load i32, ptr %.loc11_12.2, align 4, !dbg !25
+// CHECK:STDOUT:   ret i32 %.loc11_10.2, !dbg !26
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "access_anon_union.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "AccessN", linkageName: "_CAccessN.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !12)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{!10, !11}
-// CHECK:STDOUT: !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
-// CHECK:STDOUT: !11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
-// CHECK:STDOUT: !12 = !{!13}
-// CHECK:STDOUT: !13 = !DILocalVariable(arg: 1, scope: !7, type: !11)
-// CHECK:STDOUT: !14 = !DILocation(line: 7, column: 10, scope: !7)
-// CHECK:STDOUT: !15 = !DILocation(line: 7, column: 3, scope: !7)
-// CHECK:STDOUT: !16 = distinct !DISubprogram(name: "AccessP", linkageName: "_CAccessP.Main", scope: null, file: !6, line: 10, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !17)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "access_anon_union.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "AccessN", linkageName: "_CAccessN.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !17)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{!15, !16}
+// CHECK:STDOUT: !15 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+// CHECK:STDOUT: !16 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
 // CHECK:STDOUT: !17 = !{!18}
-// CHECK:STDOUT: !18 = !DILocalVariable(arg: 1, scope: !16, type: !11)
-// CHECK:STDOUT: !19 = !DILocation(line: 11, column: 11, scope: !16)
-// CHECK:STDOUT: !20 = !DILocation(line: 11, column: 10, scope: !16)
-// CHECK:STDOUT: !21 = !DILocation(line: 11, column: 3, scope: !16)
+// CHECK:STDOUT: !18 = !DILocalVariable(arg: 1, scope: !12, type: !16)
+// CHECK:STDOUT: !19 = !DILocation(line: 7, column: 10, scope: !12)
+// CHECK:STDOUT: !20 = !DILocation(line: 7, column: 3, scope: !12)
+// CHECK:STDOUT: !21 = distinct !DISubprogram(name: "AccessP", linkageName: "_CAccessP.Main", scope: null, file: !7, line: 10, type: !13, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !22)
+// CHECK:STDOUT: !22 = !{!23}
+// CHECK:STDOUT: !23 = !DILocalVariable(arg: 1, scope: !21, type: !16)
+// CHECK:STDOUT: !24 = !DILocation(line: 11, column: 11, scope: !21)
+// CHECK:STDOUT: !25 = !DILocation(line: 11, column: 10, scope: !21)
+// CHECK:STDOUT: !26 = !DILocation(line: 11, column: 3, scope: !21)

toolchain/lower/testdata/interop/cpp/function_decl.carbon

@@ -138,31 +138,37 @@ fn MyF() -> i32 {
 // CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CMyF.Main() #0 !dbg !7 {
+// CHECK:STDOUT: define void @_CMyF.Main() #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   call void @_Z3foov(), !dbg !10
-// CHECK:STDOUT:   ret void, !dbg !11
+// CHECK:STDOUT:   call void @_Z3foov(), !dbg !15
+// CHECK:STDOUT:   ret void, !dbg !16
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: declare void @_Z3foov()
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "import_function_decl.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{null}
-// CHECK:STDOUT: !10 = !DILocation(line: 7, column: 3, scope: !7)
-// CHECK:STDOUT: !11 = !DILocation(line: 6, column: 1, scope: !7)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "import_function_decl.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{null}
+// CHECK:STDOUT: !15 = !DILocation(line: 7, column: 3, scope: !12)
+// CHECK:STDOUT: !16 = !DILocation(line: 6, column: 1, scope: !12)
 // CHECK:STDOUT: ; ModuleID = 'import_inline_function_decl.carbon'
 // CHECK:STDOUT: source_filename = "import_inline_function_decl.carbon"
 // CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
@@ -171,36 +177,42 @@ fn MyF() -> i32 {
 // CHECK:STDOUT: $_Z3foov = comdat any
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CMyF.Main() #0 !dbg !7 {
+// CHECK:STDOUT: define void @_CMyF.Main() #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   call void @_Z3foov(), !dbg !10
-// CHECK:STDOUT:   ret void, !dbg !11
+// CHECK:STDOUT:   call void @_Z3foov(), !dbg !15
+// CHECK:STDOUT:   ret void, !dbg !16
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: mustprogress noinline nounwind optnone
+// CHECK:STDOUT: ; Function Attrs: inlinehint mustprogress nounwind uwtable
 // CHECK:STDOUT: define linkonce_odr dso_local void @_Z3foov() #1 comdat {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
-// CHECK:STDOUT: attributes #1 = { mustprogress noinline nounwind optnone "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #1 = { inlinehint mustprogress nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "import_inline_function_decl.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{null}
-// CHECK:STDOUT: !10 = !DILocation(line: 7, column: 3, scope: !7)
-// CHECK:STDOUT: !11 = !DILocation(line: 6, column: 1, scope: !7)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "import_inline_function_decl.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{null}
+// CHECK:STDOUT: !15 = !DILocation(line: 7, column: 3, scope: !12)
+// CHECK:STDOUT: !16 = !DILocation(line: 6, column: 1, scope: !12)
 // CHECK:STDOUT: ; ModuleID = 'import_inline_used_function_decl.carbon'
 // CHECK:STDOUT: source_filename = "import_inline_used_function_decl.carbon"
 // CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
@@ -211,13 +223,13 @@ fn MyF() -> i32 {
 // CHECK:STDOUT: @llvm.compiler.used = appending global [1 x ptr] [ptr @_Z3foov], section "llvm.metadata"
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CMyF.Main() #0 !dbg !7 {
+// CHECK:STDOUT: define void @_CMyF.Main() #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   call void @_Z3foov(), !dbg !10
-// CHECK:STDOUT:   ret void, !dbg !11
+// CHECK:STDOUT:   call void @_Z3foov(), !dbg !15
+// CHECK:STDOUT:   ret void, !dbg !16
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: mustprogress noinline nounwind optnone
+// CHECK:STDOUT: ; Function Attrs: inlinehint mustprogress nounwind uwtable
 // CHECK:STDOUT: define linkonce_odr dso_local void @_Z3foov() #1 comdat {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   ret void
@@ -227,23 +239,29 @@ fn MyF() -> i32 {
 // CHECK:STDOUT: uselistorder ptr @_Z3foov, { 1, 0 }
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
-// CHECK:STDOUT: attributes #1 = { mustprogress noinline nounwind optnone "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #1 = { inlinehint mustprogress nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "import_inline_used_function_decl.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{null}
-// CHECK:STDOUT: !10 = !DILocation(line: 7, column: 3, scope: !7)
-// CHECK:STDOUT: !11 = !DILocation(line: 6, column: 1, scope: !7)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "import_inline_used_function_decl.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{null}
+// CHECK:STDOUT: !15 = !DILocation(line: 7, column: 3, scope: !12)
+// CHECK:STDOUT: !16 = !DILocation(line: 6, column: 1, scope: !12)
 // CHECK:STDOUT: ; ModuleID = 'import_multiple_inline_function_decls.carbon'
 // CHECK:STDOUT: source_filename = "import_multiple_inline_function_decls.carbon"
 // CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
@@ -256,52 +274,58 @@ fn MyF() -> i32 {
 // CHECK:STDOUT: $_Z4foo3v = comdat any
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CMyF.Main() #0 !dbg !7 {
+// CHECK:STDOUT: define void @_CMyF.Main() #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   call void @_Z4foo1v(), !dbg !10
-// CHECK:STDOUT:   call void @_Z4foo2v(), !dbg !11
-// CHECK:STDOUT:   call void @_Z4foo3v(), !dbg !12
-// CHECK:STDOUT:   ret void, !dbg !13
+// CHECK:STDOUT:   call void @_Z4foo1v(), !dbg !15
+// CHECK:STDOUT:   call void @_Z4foo2v(), !dbg !16
+// CHECK:STDOUT:   call void @_Z4foo3v(), !dbg !17
+// CHECK:STDOUT:   ret void, !dbg !18
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: mustprogress noinline nounwind optnone
+// CHECK:STDOUT: ; Function Attrs: inlinehint mustprogress nounwind uwtable
 // CHECK:STDOUT: define linkonce_odr dso_local void @_Z4foo1v() #1 comdat {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: mustprogress noinline nounwind optnone
+// CHECK:STDOUT: ; Function Attrs: inlinehint mustprogress nounwind uwtable
 // CHECK:STDOUT: define linkonce_odr dso_local void @_Z4foo2v() #1 comdat {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: mustprogress noinline nounwind optnone
+// CHECK:STDOUT: ; Function Attrs: inlinehint mustprogress nounwind uwtable
 // CHECK:STDOUT: define linkonce_odr dso_local void @_Z4foo3v() #1 comdat {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
-// CHECK:STDOUT: attributes #1 = { mustprogress noinline nounwind optnone "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #1 = { inlinehint mustprogress nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "import_multiple_inline_function_decls.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{null}
-// CHECK:STDOUT: !10 = !DILocation(line: 7, column: 3, scope: !7)
-// CHECK:STDOUT: !11 = !DILocation(line: 8, column: 3, scope: !7)
-// CHECK:STDOUT: !12 = !DILocation(line: 9, column: 3, scope: !7)
-// CHECK:STDOUT: !13 = !DILocation(line: 6, column: 1, scope: !7)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "import_multiple_inline_function_decls.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{null}
+// CHECK:STDOUT: !15 = !DILocation(line: 7, column: 3, scope: !12)
+// CHECK:STDOUT: !16 = !DILocation(line: 8, column: 3, scope: !12)
+// CHECK:STDOUT: !17 = !DILocation(line: 9, column: 3, scope: !12)
+// CHECK:STDOUT: !18 = !DILocation(line: 6, column: 1, scope: !12)
 // CHECK:STDOUT: ; ModuleID = 'import_inline_recursive_function_decl.carbon'
 // CHECK:STDOUT: source_filename = "import_inline_recursive_function_decl.carbon"
 // CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
@@ -312,65 +336,71 @@ fn MyF() -> i32 {
 // CHECK:STDOUT: $_Z4foo1v = comdat any
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CMyF.Main() #0 !dbg !7 {
+// CHECK:STDOUT: define void @_CMyF.Main() #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   call void @_Z4foo2v(), !dbg !10
-// CHECK:STDOUT:   ret void, !dbg !11
+// CHECK:STDOUT:   call void @_Z4foo2v(), !dbg !15
+// CHECK:STDOUT:   ret void, !dbg !16
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: mustprogress noinline optnone
+// CHECK:STDOUT: ; Function Attrs: inlinehint mustprogress uwtable
 // CHECK:STDOUT: define linkonce_odr dso_local void @_Z4foo2v() #1 comdat {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   call void @_Z4foo1v()
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: mustprogress noinline nounwind optnone
+// CHECK:STDOUT: ; Function Attrs: inlinehint mustprogress nounwind uwtable
 // CHECK:STDOUT: define linkonce_odr dso_local void @_Z4foo1v() #2 comdat {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
-// CHECK:STDOUT: attributes #1 = { mustprogress noinline optnone "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
-// CHECK:STDOUT: attributes #2 = { mustprogress noinline nounwind optnone "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #1 = { inlinehint mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #2 = { inlinehint mustprogress nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "import_inline_recursive_function_decl.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{null}
-// CHECK:STDOUT: !10 = !DILocation(line: 8, column: 3, scope: !7)
-// CHECK:STDOUT: !11 = !DILocation(line: 6, column: 1, scope: !7)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "import_inline_recursive_function_decl.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{null}
+// CHECK:STDOUT: !15 = !DILocation(line: 8, column: 3, scope: !12)
+// CHECK:STDOUT: !16 = !DILocation(line: 6, column: 1, scope: !12)
 // CHECK:STDOUT: ; ModuleID = 'call_with_default_args.carbon'
 // CHECK:STDOUT: source_filename = "call_with_default_args.carbon"
 // CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
 // CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define i32 @_CMyF.Main() #0 !dbg !7 {
+// CHECK:STDOUT: define i32 @_CMyF.Main() #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %value.var = alloca i32, align 4, !dbg !11
-// CHECK:STDOUT:   call void @_Z13NoReturnValueii.carbon_thunk0(), !dbg !12
-// CHECK:STDOUT:   call void @_Z13NoReturnValueii.carbon_thunk1(i32 3), !dbg !13
-// CHECK:STDOUT:   call void @_Z13NoReturnValueii(i32 3, i32 4), !dbg !14
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %value.var), !dbg !11
-// CHECK:STDOUT:   %SimpleReturnValue__carbon_thunk.call.loc11 = call i32 @_Z17SimpleReturnValueii.carbon_thunk0(), !dbg !15
-// CHECK:STDOUT:   store i32 %SimpleReturnValue__carbon_thunk.call.loc11, ptr %value.var, align 4, !dbg !11
-// CHECK:STDOUT:   %SimpleReturnValue__carbon_thunk.call.loc12 = call i32 @_Z17SimpleReturnValueii.carbon_thunk1(i32 3), !dbg !16
-// CHECK:STDOUT:   store i32 %SimpleReturnValue__carbon_thunk.call.loc12, ptr %value.var, align 4, !dbg !17
-// CHECK:STDOUT:   %SimpleReturnValue.call = call i32 @_Z17SimpleReturnValueii(i32 3, i32 4), !dbg !18
-// CHECK:STDOUT:   store i32 %SimpleReturnValue.call, ptr %value.var, align 4, !dbg !19
-// CHECK:STDOUT:   %.loc14 = load i32, ptr %value.var, align 4, !dbg !20
-// CHECK:STDOUT:   ret i32 %.loc14, !dbg !21
+// CHECK:STDOUT:   %value.var = alloca i32, align 4, !dbg !16
+// CHECK:STDOUT:   call void @_Z13NoReturnValueii.carbon_thunk0(), !dbg !17
+// CHECK:STDOUT:   call void @_Z13NoReturnValueii.carbon_thunk1(i32 3), !dbg !18
+// CHECK:STDOUT:   call void @_Z13NoReturnValueii(i32 3, i32 4), !dbg !19
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %value.var), !dbg !16
+// CHECK:STDOUT:   %SimpleReturnValue__carbon_thunk.call.loc11 = call i32 @_Z17SimpleReturnValueii.carbon_thunk0(), !dbg !20
+// CHECK:STDOUT:   store i32 %SimpleReturnValue__carbon_thunk.call.loc11, ptr %value.var, align 4, !dbg !16
+// CHECK:STDOUT:   %SimpleReturnValue__carbon_thunk.call.loc12 = call i32 @_Z17SimpleReturnValueii.carbon_thunk1(i32 3), !dbg !21
+// CHECK:STDOUT:   store i32 %SimpleReturnValue__carbon_thunk.call.loc12, ptr %value.var, align 4, !dbg !22
+// CHECK:STDOUT:   %SimpleReturnValue.call = call i32 @_Z17SimpleReturnValueii(i32 3, i32 4), !dbg !23
+// CHECK:STDOUT:   store i32 %SimpleReturnValue.call, ptr %value.var, align 4, !dbg !24
+// CHECK:STDOUT:   %.loc14 = load i32, ptr %value.var, align 4, !dbg !25
+// CHECK:STDOUT:   ret i32 %.loc14, !dbg !26
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: declare void @_Z13NoReturnValueii(i32, i32)
@@ -380,66 +410,72 @@ fn MyF() -> i32 {
 // CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
 // CHECK:STDOUT: declare void @llvm.lifetime.start.p0(ptr captures(none)) #1
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
 // CHECK:STDOUT: define dso_local void @_Z13NoReturnValueii.carbon_thunk0() #2 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   call void @_Z13NoReturnValueii(i32 1, i32 2)
+// CHECK:STDOUT:   call void @_Z13NoReturnValueii(i32 noundef 1, i32 noundef 2)
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local void @_Z13NoReturnValueii.carbon_thunk1(i32 %a) #2 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local void @_Z13NoReturnValueii.carbon_thunk1(i32 noundef %a) #2 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %a.addr = alloca i32, align 4
-// CHECK:STDOUT:   store i32 %a, ptr %a.addr, align 4
-// CHECK:STDOUT:   %0 = load i32, ptr %a.addr, align 4
-// CHECK:STDOUT:   call void @_Z13NoReturnValueii(i32 %0, i32 2)
+// CHECK:STDOUT:   store i32 %a, ptr %a.addr, align 4, !tbaa !8
+// CHECK:STDOUT:   %0 = load i32, ptr %a.addr, align 4, !tbaa !8
+// CHECK:STDOUT:   call void @_Z13NoReturnValueii(i32 noundef %0, i32 noundef 2)
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local i32 @_Z17SimpleReturnValueii.carbon_thunk0() #2 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local noundef i32 @_Z17SimpleReturnValueii.carbon_thunk0() #2 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %call = call i32 @_Z17SimpleReturnValueii(i32 1, i32 2)
+// CHECK:STDOUT:   %call = call noundef i32 @_Z17SimpleReturnValueii(i32 noundef 1, i32 noundef 2)
 // CHECK:STDOUT:   ret i32 %call
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local i32 @_Z17SimpleReturnValueii.carbon_thunk1(i32 %a) #2 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local noundef i32 @_Z17SimpleReturnValueii.carbon_thunk1(i32 noundef %a) #2 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %a.addr = alloca i32, align 4
-// CHECK:STDOUT:   store i32 %a, ptr %a.addr, align 4
-// CHECK:STDOUT:   %0 = load i32, ptr %a.addr, align 4
-// CHECK:STDOUT:   %call = call i32 @_Z17SimpleReturnValueii(i32 %0, i32 2)
+// CHECK:STDOUT:   store i32 %a, ptr %a.addr, align 4, !tbaa !8
+// CHECK:STDOUT:   %0 = load i32, ptr %a.addr, align 4, !tbaa !8
+// CHECK:STDOUT:   %call = call noundef i32 @_Z17SimpleReturnValueii(i32 noundef %0, i32 noundef 2)
 // CHECK:STDOUT:   ret i32 %call
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
-// CHECK:STDOUT: attributes #2 = { alwaysinline mustprogress "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #2 = { alwaysinline mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "call_with_default_args.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{!10}
-// CHECK:STDOUT: !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
-// CHECK:STDOUT: !11 = !DILocation(line: 11, column: 3, scope: !7)
-// CHECK:STDOUT: !12 = !DILocation(line: 7, column: 3, scope: !7)
-// CHECK:STDOUT: !13 = !DILocation(line: 8, column: 3, scope: !7)
-// CHECK:STDOUT: !14 = !DILocation(line: 9, column: 3, scope: !7)
-// CHECK:STDOUT: !15 = !DILocation(line: 11, column: 20, scope: !7)
-// CHECK:STDOUT: !16 = !DILocation(line: 12, column: 11, scope: !7)
-// CHECK:STDOUT: !17 = !DILocation(line: 12, column: 3, scope: !7)
-// CHECK:STDOUT: !18 = !DILocation(line: 13, column: 11, scope: !7)
-// CHECK:STDOUT: !19 = !DILocation(line: 13, column: 3, scope: !7)
-// CHECK:STDOUT: !20 = !DILocation(line: 14, column: 10, scope: !7)
-// CHECK:STDOUT: !21 = !DILocation(line: 14, column: 3, scope: !7)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "call_with_default_args.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{!15}
+// CHECK:STDOUT: !15 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+// CHECK:STDOUT: !16 = !DILocation(line: 11, column: 3, scope: !12)
+// CHECK:STDOUT: !17 = !DILocation(line: 7, column: 3, scope: !12)
+// CHECK:STDOUT: !18 = !DILocation(line: 8, column: 3, scope: !12)
+// CHECK:STDOUT: !19 = !DILocation(line: 9, column: 3, scope: !12)
+// CHECK:STDOUT: !20 = !DILocation(line: 11, column: 20, scope: !12)
+// CHECK:STDOUT: !21 = !DILocation(line: 12, column: 11, scope: !12)
+// CHECK:STDOUT: !22 = !DILocation(line: 12, column: 3, scope: !12)
+// CHECK:STDOUT: !23 = !DILocation(line: 13, column: 11, scope: !12)
+// CHECK:STDOUT: !24 = !DILocation(line: 13, column: 3, scope: !12)
+// CHECK:STDOUT: !25 = !DILocation(line: 14, column: 10, scope: !12)
+// CHECK:STDOUT: !26 = !DILocation(line: 14, column: 3, scope: !12)

toolchain/lower/testdata/interop/cpp/function_in_template.carbon

@@ -38,35 +38,41 @@ fn F() {
 // CHECK:STDOUT: $_ZN1XIiE1fEi = comdat any
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CF.Main() #0 !dbg !7 {
+// CHECK:STDOUT: define void @_CF.Main() #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   call void @_ZN1XIiE1fEi(i32 42), !dbg !10
-// CHECK:STDOUT:   ret void, !dbg !11
+// CHECK:STDOUT:   call void @_ZN1XIiE1fEi(i32 42), !dbg !15
+// CHECK:STDOUT:   ret void, !dbg !16
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: mustprogress noinline nounwind optnone
-// CHECK:STDOUT: define linkonce_odr dso_local void @_ZN1XIiE1fEi(i32 %t) #1 comdat align 2 {
+// CHECK:STDOUT: ; Function Attrs: mustprogress nounwind uwtable
+// CHECK:STDOUT: define linkonce_odr dso_local void @_ZN1XIiE1fEi(i32 noundef %t) #1 comdat align 2 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %t.addr = alloca i32, align 4
-// CHECK:STDOUT:   store i32 %t, ptr %t.addr, align 4
+// CHECK:STDOUT:   store i32 %t, ptr %t.addr, align 4, !tbaa !8
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
-// CHECK:STDOUT: attributes #1 = { mustprogress noinline nounwind optnone "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #1 = { mustprogress nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "use_class_template.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{null}
-// CHECK:STDOUT: !10 = !DILocation(line: 8, column: 3, scope: !7)
-// CHECK:STDOUT: !11 = !DILocation(line: 6, column: 1, scope: !7)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "use_class_template.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{null}
+// CHECK:STDOUT: !15 = !DILocation(line: 8, column: 3, scope: !12)
+// CHECK:STDOUT: !16 = !DILocation(line: 6, column: 1, scope: !12)

toolchain/lower/testdata/interop/cpp/globals.carbon

@@ -164,27 +164,33 @@ fn ReadStaticVarTemplateWithConstructor() -> Cpp.Y* {
 // CHECK:STDOUT: @global = dso_local global %class.C zeroinitializer, align 1
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CMyF.Main() #0 !dbg !7 {
+// CHECK:STDOUT: define void @_CMyF.Main() #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   ret void, !dbg !10
+// CHECK:STDOUT:   ret void, !dbg !15
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "import_global.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{null}
-// CHECK:STDOUT: !10 = !DILocation(line: 6, column: 1, scope: !7)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "import_global.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{null}
+// CHECK:STDOUT: !15 = !DILocation(line: 6, column: 1, scope: !12)
 // CHECK:STDOUT: ; ModuleID = 'import_inline.carbon'
 // CHECK:STDOUT: source_filename = "import_inline.carbon"
 // CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
@@ -201,14 +207,15 @@ fn ReadStaticVarTemplateWithConstructor() -> Cpp.Y* {
 // CHECK:STDOUT: @__dso_handle = external hidden global i8
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CCallF.Main() #0 !dbg !7 {
+// CHECK:STDOUT: define void @_CCallF.Main() #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   call void @_ZN1C1fEv(ptr @inline_global), !dbg !10
-// CHECK:STDOUT:   ret void, !dbg !11
+// CHECK:STDOUT:   call void @_ZN1C1fEv(ptr @inline_global), !dbg !15
+// CHECK:STDOUT:   ret void, !dbg !16
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: declare void @_ZN1C1fEv(ptr)
 // CHECK:STDOUT:
+// CHECK:STDOUT: ; Function Attrs: uwtable
 // CHECK:STDOUT: define internal void @__cxx_global_var_init() #1 section ".text.startup" comdat($inline_global) personality ptr @__gxx_personality_v0 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %exn.slot = alloca ptr, align 8
@@ -223,7 +230,7 @@ fn ReadStaticVarTemplateWithConstructor() -> Cpp.Y* {
 // CHECK:STDOUT:   br i1 %tobool, label %init, label %init.end
 // CHECK:STDOUT:
 // CHECK:STDOUT: init:                                             ; preds = %init.check
-// CHECK:STDOUT:   invoke void @_ZN1CC1Ev(ptr nonnull align 1 dereferenceable(1) @inline_global)
+// CHECK:STDOUT:   invoke void @_ZN1CC1Ev(ptr noundef nonnull align 1 dereferenceable(1) @inline_global)
 // CHECK:STDOUT:           to label %invoke.cont unwind label %lpad
 // CHECK:STDOUT:
 // CHECK:STDOUT: invoke.cont:                                      ; preds = %init
@@ -257,10 +264,10 @@ fn ReadStaticVarTemplateWithConstructor() -> Cpp.Y* {
 // CHECK:STDOUT: ; Function Attrs: nounwind
 // CHECK:STDOUT: declare i32 @__cxa_guard_acquire(ptr) #0
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare void @_ZN1CC1Ev(ptr nonnull align 1 dereferenceable(1)) unnamed_addr #2
+// CHECK:STDOUT: declare void @_ZN1CC1Ev(ptr noundef nonnull align 1 dereferenceable(1)) unnamed_addr #2
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: declare void @_ZN1CD1Ev(ptr nonnull align 1 dereferenceable(1)) unnamed_addr #3
+// CHECK:STDOUT: declare void @_ZN1CD1Ev(ptr noundef nonnull align 1 dereferenceable(1)) unnamed_addr #3
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
 // CHECK:STDOUT: declare i32 @__cxa_atexit(ptr, ptr, ptr) #0
@@ -275,25 +282,31 @@ fn ReadStaticVarTemplateWithConstructor() -> Cpp.Y* {
 // CHECK:STDOUT: uselistorder ptr @inline_global, { 1, 2, 4, 3, 0 }
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
-// CHECK:STDOUT: attributes #1 = { "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
-// CHECK:STDOUT: attributes #2 = { "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
-// CHECK:STDOUT: attributes #3 = { nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #1 = { uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #2 = { "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #3 = { nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "import_inline.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "CallF", linkageName: "_CCallF.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{null}
-// CHECK:STDOUT: !10 = !DILocation(line: 7, column: 3, scope: !7)
-// CHECK:STDOUT: !11 = !DILocation(line: 6, column: 1, scope: !7)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "import_inline.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "CallF", linkageName: "_CCallF.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{null}
+// CHECK:STDOUT: !15 = !DILocation(line: 7, column: 3, scope: !12)
+// CHECK:STDOUT: !16 = !DILocation(line: 6, column: 1, scope: !12)
 // CHECK:STDOUT: ; ModuleID = 'todo_import_thread_local.carbon'
 // CHECK:STDOUT: source_filename = "todo_import_thread_local.carbon"
 // CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
@@ -310,20 +323,21 @@ fn ReadStaticVarTemplateWithConstructor() -> Cpp.Y* {
 // CHECK:STDOUT: @_ZTH29thread_local_global_with_init = dso_local alias void (), ptr @__tls_init
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CThreadLocalStore.Main() #0 !dbg !7 {
+// CHECK:STDOUT: define void @_CThreadLocalStore.Main() #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   store i32 42, ptr @thread_local_global, align 4, !dbg !10
-// CHECK:STDOUT:   ret void, !dbg !11
+// CHECK:STDOUT:   store i32 42, ptr @thread_local_global, align 4, !dbg !15
+// CHECK:STDOUT:   ret void, !dbg !16
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define i32 @_CThreadLocalTriggerInit.Main() #0 !dbg !12 {
+// CHECK:STDOUT: define i32 @_CThreadLocalTriggerInit.Main() #0 !dbg !17 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc14 = load i32, ptr @thread_local_global_with_init, align 4, !dbg !16
-// CHECK:STDOUT:   ret i32 %.loc14, !dbg !17
+// CHECK:STDOUT:   %.loc14 = load i32, ptr @thread_local_global_with_init, align 4, !dbg !21
+// CHECK:STDOUT:   ret i32 %.loc14, !dbg !22
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: define weak_odr hidden ptr @_ZTW19thread_local_global() #1 comdat {
+// CHECK:STDOUT: ; Function Attrs: uwtable
+// CHECK:STDOUT: define weak_odr hidden noundef ptr @_ZTW19thread_local_global() #1 comdat {
 // CHECK:STDOUT:   %1 = call align 4 ptr @llvm.threadlocal.address.p0(ptr align 4 @thread_local_global)
 // CHECK:STDOUT:   ret ptr %1
 // CHECK:STDOUT: }
@@ -331,20 +345,23 @@ fn ReadStaticVarTemplateWithConstructor() -> Cpp.Y* {
 // CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
 // CHECK:STDOUT: declare nonnull ptr @llvm.threadlocal.address.p0(ptr nonnull) #2
 // CHECK:STDOUT:
-// CHECK:STDOUT: define weak_odr hidden ptr @_ZTW29thread_local_global_with_init() #1 comdat {
+// CHECK:STDOUT: ; Function Attrs: uwtable
+// CHECK:STDOUT: define weak_odr hidden noundef ptr @_ZTW29thread_local_global_with_init() #1 comdat {
 // CHECK:STDOUT:   call void @_ZTH29thread_local_global_with_init()
 // CHECK:STDOUT:   %1 = call align 4 ptr @llvm.threadlocal.address.p0(ptr align 4 @thread_local_global_with_init)
 // CHECK:STDOUT:   ret ptr %1
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
+// CHECK:STDOUT: ; Function Attrs: uwtable
 // CHECK:STDOUT: define internal void @__tls_init() #3 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %0 = load i8, ptr @__tls_guard, align 1
 // CHECK:STDOUT:   %guard.uninitialized = icmp eq i8 %0, 0
-// CHECK:STDOUT:   br i1 %guard.uninitialized, label %init, label %exit, !prof !18
+// CHECK:STDOUT:   br i1 %guard.uninitialized, label %init, label %exit, !prof !23
 // CHECK:STDOUT:
 // CHECK:STDOUT: init:                                             ; preds = %entry
 // CHECK:STDOUT:   store i8 1, ptr @__tls_guard, align 1
+// CHECK:STDOUT:   %1 = call ptr @llvm.invariant.start.p0(i64 1, ptr @__tls_guard)
 // CHECK:STDOUT:   call void @__cxx_global_var_init()
 // CHECK:STDOUT:   br label %exit
 // CHECK:STDOUT:
@@ -352,43 +369,55 @@ fn ReadStaticVarTemplateWithConstructor() -> Cpp.Y* {
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
+// CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
+// CHECK:STDOUT: declare ptr @llvm.invariant.start.p0(i64 immarg, ptr captures(none)) #4
+// CHECK:STDOUT:
+// CHECK:STDOUT: ; Function Attrs: uwtable
 // CHECK:STDOUT: define internal void @__cxx_global_var_init() #3 section ".text.startup" {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %call = call i32 @_Z4initv()
+// CHECK:STDOUT:   %call = call noundef i32 @_Z4initv()
 // CHECK:STDOUT:   %0 = call align 4 ptr @llvm.threadlocal.address.p0(ptr align 4 @thread_local_global_with_init)
-// CHECK:STDOUT:   store i32 %call, ptr %0, align 4
+// CHECK:STDOUT:   store i32 %call, ptr %0, align 4, !tbaa !8
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare i32 @_Z4initv() #1
+// CHECK:STDOUT: declare noundef i32 @_Z4initv() #5
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
-// CHECK:STDOUT: attributes #1 = { "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #1 = { uwtable "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
 // CHECK:STDOUT: attributes #2 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
-// CHECK:STDOUT: attributes #3 = { "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #3 = { uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #4 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
+// CHECK:STDOUT: attributes #5 = { "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "todo_import_thread_local.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "ThreadLocalStore", linkageName: "_CThreadLocalStore.Main", scope: null, file: !6, line: 9, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{null}
-// CHECK:STDOUT: !10 = !DILocation(line: 10, column: 3, scope: !7)
-// CHECK:STDOUT: !11 = !DILocation(line: 9, column: 1, scope: !7)
-// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "ThreadLocalTriggerInit", linkageName: "_CThreadLocalTriggerInit.Main", scope: null, file: !6, line: 13, type: !13, spFlags: DISPFlagDefinition, unit: !5)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "todo_import_thread_local.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "ThreadLocalStore", linkageName: "_CThreadLocalStore.Main", scope: null, file: !7, line: 9, type: !13, spFlags: DISPFlagDefinition, unit: !6)
 // CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
-// CHECK:STDOUT: !14 = !{!15}
-// CHECK:STDOUT: !15 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
-// CHECK:STDOUT: !16 = !DILocation(line: 14, column: 10, scope: !12)
-// CHECK:STDOUT: !17 = !DILocation(line: 14, column: 3, scope: !12)
-// CHECK:STDOUT: !18 = !{!"branch_weights", i32 1, i32 1023}
+// CHECK:STDOUT: !14 = !{null}
+// CHECK:STDOUT: !15 = !DILocation(line: 10, column: 3, scope: !12)
+// CHECK:STDOUT: !16 = !DILocation(line: 9, column: 1, scope: !12)
+// CHECK:STDOUT: !17 = distinct !DISubprogram(name: "ThreadLocalTriggerInit", linkageName: "_CThreadLocalTriggerInit.Main", scope: null, file: !7, line: 13, type: !18, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !18 = !DISubroutineType(types: !19)
+// CHECK:STDOUT: !19 = !{!20}
+// CHECK:STDOUT: !20 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+// CHECK:STDOUT: !21 = !DILocation(line: 14, column: 10, scope: !17)
+// CHECK:STDOUT: !22 = !DILocation(line: 14, column: 3, scope: !17)
+// CHECK:STDOUT: !23 = !{!"branch_weights", i32 1, i32 1023}
 // CHECK:STDOUT: ; ModuleID = 'import_static.carbon'
 // CHECK:STDOUT: source_filename = "import_static.carbon"
 // CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
@@ -397,30 +426,36 @@ fn ReadStaticVarTemplateWithConstructor() -> Cpp.Y* {
 // CHECK:STDOUT: @_ZN1X1nE = external global i32
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define i32 @_CReadStatic.Main() #0 !dbg !7 {
+// CHECK:STDOUT: define i32 @_CReadStatic.Main() #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc7 = load i32, ptr @_ZN1X1nE, align 4, !dbg !11
-// CHECK:STDOUT:   ret i32 %.loc7, !dbg !12
+// CHECK:STDOUT:   %.loc7 = load i32, ptr @_ZN1X1nE, align 4, !dbg !16
+// CHECK:STDOUT:   ret i32 %.loc7, !dbg !17
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "import_static.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "ReadStatic", linkageName: "_CReadStatic.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{!10}
-// CHECK:STDOUT: !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
-// CHECK:STDOUT: !11 = !DILocation(line: 7, column: 10, scope: !7)
-// CHECK:STDOUT: !12 = !DILocation(line: 7, column: 3, scope: !7)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "import_static.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "ReadStatic", linkageName: "_CReadStatic.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{!15}
+// CHECK:STDOUT: !15 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+// CHECK:STDOUT: !16 = !DILocation(line: 7, column: 10, scope: !12)
+// CHECK:STDOUT: !17 = !DILocation(line: 7, column: 3, scope: !12)
 // CHECK:STDOUT: ; ModuleID = 'import_var_template.carbon'
 // CHECK:STDOUT: source_filename = "import_var_template.carbon"
 // CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
@@ -432,41 +467,47 @@ fn ReadStaticVarTemplateWithConstructor() -> Cpp.Y* {
 // CHECK:STDOUT: @_Z4tmplI1YE = external global %opaque
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define i32 @_CReadVarTemplate.Main() #0 !dbg !7 {
+// CHECK:STDOUT: define i32 @_CReadVarTemplate.Main() #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc7 = load i32, ptr @_Z4tmplIiE, align 4, !dbg !11
-// CHECK:STDOUT:   ret i32 %.loc7, !dbg !12
+// CHECK:STDOUT:   %.loc7 = load i32, ptr @_Z4tmplIiE, align 4, !dbg !16
+// CHECK:STDOUT:   ret i32 %.loc7, !dbg !17
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define ptr @_CReadVarTemplateWithConstructor.Main() #0 !dbg !13 {
+// CHECK:STDOUT: define ptr @_CReadVarTemplateWithConstructor.Main() #0 !dbg !18 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   ret ptr @_Z4tmplI1YE, !dbg !17
+// CHECK:STDOUT:   ret ptr @_Z4tmplI1YE, !dbg !22
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "import_var_template.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "ReadVarTemplate", linkageName: "_CReadVarTemplate.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{!10}
-// CHECK:STDOUT: !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
-// CHECK:STDOUT: !11 = !DILocation(line: 7, column: 10, scope: !7)
-// CHECK:STDOUT: !12 = !DILocation(line: 7, column: 3, scope: !7)
-// CHECK:STDOUT: !13 = distinct !DISubprogram(name: "ReadVarTemplateWithConstructor", linkageName: "_CReadVarTemplateWithConstructor.Main", scope: null, file: !6, line: 10, type: !14, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !14 = !DISubroutineType(types: !15)
-// CHECK:STDOUT: !15 = !{!16}
-// CHECK:STDOUT: !16 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
-// CHECK:STDOUT: !17 = !DILocation(line: 11, column: 3, scope: !13)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "import_var_template.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "ReadVarTemplate", linkageName: "_CReadVarTemplate.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{!15}
+// CHECK:STDOUT: !15 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+// CHECK:STDOUT: !16 = !DILocation(line: 7, column: 10, scope: !12)
+// CHECK:STDOUT: !17 = !DILocation(line: 7, column: 3, scope: !12)
+// CHECK:STDOUT: !18 = distinct !DISubprogram(name: "ReadVarTemplateWithConstructor", linkageName: "_CReadVarTemplateWithConstructor.Main", scope: null, file: !7, line: 10, type: !19, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !19 = !DISubroutineType(types: !20)
+// CHECK:STDOUT: !20 = !{!21}
+// CHECK:STDOUT: !21 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
+// CHECK:STDOUT: !22 = !DILocation(line: 11, column: 3, scope: !18)
 // CHECK:STDOUT: ; ModuleID = 'import_static_template.carbon'
 // CHECK:STDOUT: source_filename = "import_static_template.carbon"
 // CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
@@ -478,38 +519,44 @@ fn ReadStaticVarTemplateWithConstructor() -> Cpp.Y* {
 // CHECK:STDOUT: @_ZN1X11static_tmplI1YEE = external global %opaque
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define i32 @_CReadStaticVarTemplate.Main() #0 !dbg !7 {
+// CHECK:STDOUT: define i32 @_CReadStaticVarTemplate.Main() #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc7 = load i32, ptr @_ZN1X11static_tmplIiEE, align 4, !dbg !11
-// CHECK:STDOUT:   ret i32 %.loc7, !dbg !12
+// CHECK:STDOUT:   %.loc7 = load i32, ptr @_ZN1X11static_tmplIiEE, align 4, !dbg !16
+// CHECK:STDOUT:   ret i32 %.loc7, !dbg !17
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define ptr @_CReadStaticVarTemplateWithConstructor.Main() #0 !dbg !13 {
+// CHECK:STDOUT: define ptr @_CReadStaticVarTemplateWithConstructor.Main() #0 !dbg !18 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   ret ptr @_ZN1X11static_tmplI1YEE, !dbg !17
+// CHECK:STDOUT:   ret ptr @_ZN1X11static_tmplI1YEE, !dbg !22
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "import_static_template.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "ReadStaticVarTemplate", linkageName: "_CReadStaticVarTemplate.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{!10}
-// CHECK:STDOUT: !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
-// CHECK:STDOUT: !11 = !DILocation(line: 7, column: 10, scope: !7)
-// CHECK:STDOUT: !12 = !DILocation(line: 7, column: 3, scope: !7)
-// CHECK:STDOUT: !13 = distinct !DISubprogram(name: "ReadStaticVarTemplateWithConstructor", linkageName: "_CReadStaticVarTemplateWithConstructor.Main", scope: null, file: !6, line: 10, type: !14, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !14 = !DISubroutineType(types: !15)
-// CHECK:STDOUT: !15 = !{!16}
-// CHECK:STDOUT: !16 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
-// CHECK:STDOUT: !17 = !DILocation(line: 11, column: 3, scope: !13)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "import_static_template.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "ReadStaticVarTemplate", linkageName: "_CReadStaticVarTemplate.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{!15}
+// CHECK:STDOUT: !15 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+// CHECK:STDOUT: !16 = !DILocation(line: 7, column: 10, scope: !12)
+// CHECK:STDOUT: !17 = !DILocation(line: 7, column: 3, scope: !12)
+// CHECK:STDOUT: !18 = distinct !DISubprogram(name: "ReadStaticVarTemplateWithConstructor", linkageName: "_CReadStaticVarTemplateWithConstructor.Main", scope: null, file: !7, line: 10, type: !19, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !19 = !DISubroutineType(types: !20)
+// CHECK:STDOUT: !20 = !{!21}
+// CHECK:STDOUT: !21 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
+// CHECK:STDOUT: !22 = !DILocation(line: 11, column: 3, scope: !18)

toolchain/lower/testdata/interop/cpp/import_inline.carbon

@@ -30,48 +30,57 @@ fn Call() -> i32 {
 // CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define i32 @_CCall.Main() #0 !dbg !7 {
+// CHECK:STDOUT: define i32 @_CCall.Main() #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %n.var = alloca i32, align 4, !dbg !11
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %n.var), !dbg !11
-// CHECK:STDOUT:   store i32 0, ptr %n.var, align 4, !dbg !11
-// CHECK:STDOUT:   call void @_Z1FPi(ptr %n.var), !dbg !12
-// CHECK:STDOUT:   %.loc24 = load i32, ptr %n.var, align 4, !dbg !13
-// CHECK:STDOUT:   ret i32 %.loc24, !dbg !14
+// CHECK:STDOUT:   %n.var = alloca i32, align 4, !dbg !16
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %n.var), !dbg !16
+// CHECK:STDOUT:   store i32 0, ptr %n.var, align 4, !dbg !16
+// CHECK:STDOUT:   call void @_Z1FPi(ptr %n.var), !dbg !17
+// CHECK:STDOUT:   %.loc24 = load i32, ptr %n.var, align 4, !dbg !18
+// CHECK:STDOUT:   ret i32 %.loc24, !dbg !19
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
 // CHECK:STDOUT: declare void @llvm.lifetime.start.p0(ptr captures(none)) #1
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: mustprogress noinline nounwind optnone
-// CHECK:STDOUT: define dso_local void @_Z1FPi(ptr %p) #2 {
+// CHECK:STDOUT: ; Function Attrs: mustprogress nounwind uwtable
+// CHECK:STDOUT: define dso_local void @_Z1FPi(ptr noundef %p) #2 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %p.addr = alloca ptr, align 8
-// CHECK:STDOUT:   store ptr %p, ptr %p.addr, align 8
-// CHECK:STDOUT:   %0 = load ptr, ptr %p.addr, align 8
-// CHECK:STDOUT:   store i32 1, ptr %0, align 4
+// CHECK:STDOUT:   store ptr %p, ptr %p.addr, align 8, !tbaa !20
+// CHECK:STDOUT:   %0 = load ptr, ptr %p.addr, align 8, !tbaa !20
+// CHECK:STDOUT:   store i32 1, ptr %0, align 4, !tbaa !8
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
-// CHECK:STDOUT: attributes #2 = { mustprogress noinline nounwind optnone "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #2 = { mustprogress nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "import_inline.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "Call", linkageName: "_CCall.Main", scope: null, file: !6, line: 21, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{!10}
-// CHECK:STDOUT: !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
-// CHECK:STDOUT: !11 = !DILocation(line: 22, column: 3, scope: !7)
-// CHECK:STDOUT: !12 = !DILocation(line: 23, column: 3, scope: !7)
-// CHECK:STDOUT: !13 = !DILocation(line: 24, column: 10, scope: !7)
-// CHECK:STDOUT: !14 = !DILocation(line: 24, column: 3, scope: !7)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "import_inline.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "Call", linkageName: "_CCall.Main", scope: null, file: !7, line: 21, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{!15}
+// CHECK:STDOUT: !15 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+// CHECK:STDOUT: !16 = !DILocation(line: 22, column: 3, scope: !12)
+// CHECK:STDOUT: !17 = !DILocation(line: 23, column: 3, scope: !12)
+// CHECK:STDOUT: !18 = !DILocation(line: 24, column: 10, scope: !12)
+// CHECK:STDOUT: !19 = !DILocation(line: 24, column: 3, scope: !12)
+// CHECK:STDOUT: !20 = !{!21, !21, i64 0}
+// CHECK:STDOUT: !21 = !{!"p1 int", !22, i64 0}
+// CHECK:STDOUT: !22 = !{!"any pointer", !10, i64 0}

toolchain/lower/testdata/interop/cpp/method.carbon

@@ -84,58 +84,70 @@ fn Call(n: Cpp.NeedThunk) {
 // CHECK:STDOUT: $_ZNK1A6by_valEv = comdat any
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define i32 @_CUseVal.Main(ptr %a) #0 !dbg !7 {
+// CHECK:STDOUT: define i32 @_CUseVal.Main(ptr %a) #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %by_val__carbon_thunk.call = call i32 @_ZNK1A6by_valEv.carbon_thunk(ptr %a), !dbg !14
-// CHECK:STDOUT:   ret i32 %by_val__carbon_thunk.call, !dbg !15
+// CHECK:STDOUT:   %by_val__carbon_thunk.call = call i32 @_ZNK1A6by_valEv.carbon_thunk(ptr %a), !dbg !19
+// CHECK:STDOUT:   ret i32 %by_val__carbon_thunk.call, !dbg !20
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local i32 @_ZNK1A6by_valEv.carbon_thunk(ptr nonnull align 8 dereferenceable(12) %this) #1 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local noundef i32 @_ZNK1A6by_valEv.carbon_thunk(ptr noundef nonnull align 8 dereferenceable(12) %this) #1 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %this.addr = alloca ptr, align 8
-// CHECK:STDOUT:   store ptr %this, ptr %this.addr, align 8
-// CHECK:STDOUT:   %0 = load ptr, ptr %this.addr, align 8, !nonnull !16, !align !17
-// CHECK:STDOUT:   %call = call i32 @_ZNK1A6by_valEv(ptr nonnull align 8 dereferenceable(12) %0)
+// CHECK:STDOUT:   store ptr %this, ptr %this.addr, align 8, !tbaa !21
+// CHECK:STDOUT:   %0 = load ptr, ptr %this.addr, align 8, !tbaa !21, !nonnull !24, !align !25
+// CHECK:STDOUT:   %call = call noundef i32 @_ZNK1A6by_valEv(ptr noundef nonnull align 8 dereferenceable(12) %0)
 // CHECK:STDOUT:   ret i32 %call
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: mustprogress noinline nounwind optnone
-// CHECK:STDOUT: define linkonce_odr dso_local i32 @_ZNK1A6by_valEv(ptr nonnull align 8 dereferenceable(12) %this) #2 comdat align 2 {
+// CHECK:STDOUT: ; Function Attrs: mustprogress nounwind uwtable
+// CHECK:STDOUT: define linkonce_odr dso_local noundef i32 @_ZNK1A6by_valEv(ptr noundef nonnull align 8 dereferenceable(12) %this) #2 comdat align 2 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %this.addr = alloca ptr, align 8
-// CHECK:STDOUT:   store ptr %this, ptr %this.addr, align 8
+// CHECK:STDOUT:   store ptr %this, ptr %this.addr, align 8, !tbaa !21
 // CHECK:STDOUT:   %this1 = load ptr, ptr %this.addr, align 8
 // CHECK:STDOUT:   %n = getelementptr inbounds nuw %struct.A, ptr %this1, i32 0, i32 1
-// CHECK:STDOUT:   %0 = load i32, ptr %n, align 8
+// CHECK:STDOUT:   %0 = load i32, ptr %n, align 8, !tbaa !26
 // CHECK:STDOUT:   ret i32 %0
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
-// CHECK:STDOUT: attributes #1 = { alwaysinline mustprogress "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
-// CHECK:STDOUT: attributes #2 = { mustprogress noinline nounwind optnone "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #1 = { alwaysinline mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #2 = { mustprogress nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "call_by_val.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "UseVal", linkageName: "_CUseVal.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !12)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{!10, !11}
-// CHECK:STDOUT: !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
-// CHECK:STDOUT: !11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
-// CHECK:STDOUT: !12 = !{!13}
-// CHECK:STDOUT: !13 = !DILocalVariable(arg: 1, scope: !7, type: !11)
-// CHECK:STDOUT: !14 = !DILocation(line: 7, column: 10, scope: !7)
-// CHECK:STDOUT: !15 = !DILocation(line: 7, column: 3, scope: !7)
-// CHECK:STDOUT: !16 = !{}
-// CHECK:STDOUT: !17 = !{i64 8}
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "call_by_val.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "UseVal", linkageName: "_CUseVal.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !17)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{!15, !16}
+// CHECK:STDOUT: !15 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+// CHECK:STDOUT: !16 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
+// CHECK:STDOUT: !17 = !{!18}
+// CHECK:STDOUT: !18 = !DILocalVariable(arg: 1, scope: !12, type: !16)
+// CHECK:STDOUT: !19 = !DILocation(line: 7, column: 10, scope: !12)
+// CHECK:STDOUT: !20 = !DILocation(line: 7, column: 3, scope: !12)
+// CHECK:STDOUT: !21 = !{!22, !22, i64 0}
+// CHECK:STDOUT: !22 = !{!"p1 _ZTS1A", !23, i64 0}
+// CHECK:STDOUT: !23 = !{!"any pointer", !10, i64 0}
+// CHECK:STDOUT: !24 = !{}
+// CHECK:STDOUT: !25 = !{i64 8}
+// CHECK:STDOUT: !26 = !{!27, !9, i64 8}
+// CHECK:STDOUT: !27 = !{!"_ZTS1A", !28, i64 0, !9, i64 8}
+// CHECK:STDOUT: !28 = !{!"_ZTS4Base"}
 // CHECK:STDOUT: ; ModuleID = 'call_by_ref.carbon'
 // CHECK:STDOUT: source_filename = "call_by_ref.carbon"
 // CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
@@ -147,63 +159,75 @@ fn Call(n: Cpp.NeedThunk) {
 // CHECK:STDOUT: $_ZN1A6by_refEv = comdat any
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define i32 @_CUseVal.Main(ptr %a) #0 !dbg !7 {
+// CHECK:STDOUT: define i32 @_CUseVal.Main(ptr %a) #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %A.by_ref.call = call i32 @_ZN1A6by_refEv(ptr %a), !dbg !14
-// CHECK:STDOUT:   ret i32 %A.by_ref.call, !dbg !15
+// CHECK:STDOUT:   %A.by_ref.call = call i32 @_ZN1A6by_refEv(ptr %a), !dbg !19
+// CHECK:STDOUT:   ret i32 %A.by_ref.call, !dbg !20
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: mustprogress noinline nounwind optnone
-// CHECK:STDOUT: define linkonce_odr dso_local i32 @_ZN1A6by_refEv(ptr nonnull align 8 dereferenceable(12) %this) #1 comdat align 2 {
+// CHECK:STDOUT: ; Function Attrs: mustprogress nounwind uwtable
+// CHECK:STDOUT: define linkonce_odr dso_local noundef i32 @_ZN1A6by_refEv(ptr noundef nonnull align 8 dereferenceable(12) %this) #1 comdat align 2 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %this.addr = alloca ptr, align 8
-// CHECK:STDOUT:   store ptr %this, ptr %this.addr, align 8
+// CHECK:STDOUT:   store ptr %this, ptr %this.addr, align 8, !tbaa !21
 // CHECK:STDOUT:   %this1 = load ptr, ptr %this.addr, align 8
 // CHECK:STDOUT:   %n = getelementptr inbounds nuw %struct.A, ptr %this1, i32 0, i32 1
-// CHECK:STDOUT:   %0 = load i32, ptr %n, align 8
+// CHECK:STDOUT:   %0 = load i32, ptr %n, align 8, !tbaa !24
 // CHECK:STDOUT:   ret i32 %0
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
-// CHECK:STDOUT: attributes #1 = { mustprogress noinline nounwind optnone "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #1 = { mustprogress nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "call_by_ref.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "UseVal", linkageName: "_CUseVal.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !12)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{!10, !11}
-// CHECK:STDOUT: !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
-// CHECK:STDOUT: !11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
-// CHECK:STDOUT: !12 = !{!13}
-// CHECK:STDOUT: !13 = !DILocalVariable(arg: 1, scope: !7, type: !11)
-// CHECK:STDOUT: !14 = !DILocation(line: 7, column: 10, scope: !7)
-// CHECK:STDOUT: !15 = !DILocation(line: 7, column: 3, scope: !7)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "call_by_ref.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "UseVal", linkageName: "_CUseVal.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !17)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{!15, !16}
+// CHECK:STDOUT: !15 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+// CHECK:STDOUT: !16 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
+// CHECK:STDOUT: !17 = !{!18}
+// CHECK:STDOUT: !18 = !DILocalVariable(arg: 1, scope: !12, type: !16)
+// CHECK:STDOUT: !19 = !DILocation(line: 7, column: 10, scope: !12)
+// CHECK:STDOUT: !20 = !DILocation(line: 7, column: 3, scope: !12)
+// CHECK:STDOUT: !21 = !{!22, !22, i64 0}
+// CHECK:STDOUT: !22 = !{!"p1 _ZTS1A", !23, i64 0}
+// CHECK:STDOUT: !23 = !{!"any pointer", !10, i64 0}
+// CHECK:STDOUT: !24 = !{!25, !9, i64 8}
+// CHECK:STDOUT: !25 = !{!"_ZTS1A", !26, i64 0, !9, i64 8}
+// CHECK:STDOUT: !26 = !{!"_ZTS4Base"}
 // CHECK:STDOUT: ; ModuleID = 'call_virtual.carbon'
 // CHECK:STDOUT: source_filename = "call_virtual.carbon"
 // CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
 // CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CUseVal.Main(ptr %a) #0 !dbg !7 {
+// CHECK:STDOUT: define void @_CUseVal.Main(ptr %a) #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc7_4.2.base = getelementptr inbounds nuw [16 x i8], ptr %a, i32 0, i32 0, !dbg !13
-// CHECK:STDOUT:   %Base.virt0.call.vtable = load ptr, ptr %.loc7_4.2.base, align 8, !dbg !13
-// CHECK:STDOUT:   %Base.virt0.call = getelementptr ptr, ptr %Base.virt0.call.vtable, i32 0, !dbg !13
-// CHECK:STDOUT:   %Base.virt0.call.memptr.virtualfn = load ptr, ptr %Base.virt0.call, align 8, !dbg !13
-// CHECK:STDOUT:   call void %Base.virt0.call.memptr.virtualfn(ptr %.loc7_4.2.base), !dbg !13
-// CHECK:STDOUT:   %A.virt1.call.vtable = load ptr, ptr %a, align 8, !dbg !14
-// CHECK:STDOUT:   %A.virt1.call = getelementptr ptr, ptr %A.virt1.call.vtable, i32 1, !dbg !14
-// CHECK:STDOUT:   %A.virt1.call.memptr.virtualfn = load ptr, ptr %A.virt1.call, align 8, !dbg !14
-// CHECK:STDOUT:   call void %A.virt1.call.memptr.virtualfn(ptr %a), !dbg !14
-// CHECK:STDOUT:   ret void, !dbg !15
+// CHECK:STDOUT:   %.loc7_4.2.base = getelementptr inbounds nuw [16 x i8], ptr %a, i32 0, i32 0, !dbg !18
+// CHECK:STDOUT:   %Base.virt0.call.vtable = load ptr, ptr %.loc7_4.2.base, align 8, !dbg !18
+// CHECK:STDOUT:   %Base.virt0.call = getelementptr ptr, ptr %Base.virt0.call.vtable, i32 0, !dbg !18
+// CHECK:STDOUT:   %Base.virt0.call.memptr.virtualfn = load ptr, ptr %Base.virt0.call, align 8, !dbg !18
+// CHECK:STDOUT:   call void %Base.virt0.call.memptr.virtualfn(ptr %.loc7_4.2.base), !dbg !18
+// CHECK:STDOUT:   %A.virt1.call.vtable = load ptr, ptr %a, align 8, !dbg !19
+// CHECK:STDOUT:   %A.virt1.call = getelementptr ptr, ptr %A.virt1.call.vtable, i32 1, !dbg !19
+// CHECK:STDOUT:   %A.virt1.call.memptr.virtualfn = load ptr, ptr %A.virt1.call, align 8, !dbg !19
+// CHECK:STDOUT:   call void %A.virt1.call.memptr.virtualfn(ptr %a), !dbg !19
+// CHECK:STDOUT:   ret void, !dbg !20
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: declare void @_ZN4Base5virt0Ev(ptr)
@@ -212,25 +236,31 @@ fn Call(n: Cpp.NeedThunk) {
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "call_virtual.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "UseVal", linkageName: "_CUseVal.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !11)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{null, !10}
-// CHECK:STDOUT: !10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
-// CHECK:STDOUT: !11 = !{!12}
-// CHECK:STDOUT: !12 = !DILocalVariable(arg: 1, scope: !7, type: !10)
-// CHECK:STDOUT: !13 = !DILocation(line: 7, column: 3, scope: !7)
-// CHECK:STDOUT: !14 = !DILocation(line: 8, column: 3, scope: !7)
-// CHECK:STDOUT: !15 = !DILocation(line: 6, column: 1, scope: !7)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "call_virtual.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "UseVal", linkageName: "_CUseVal.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !16)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{null, !15}
+// CHECK:STDOUT: !15 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
+// CHECK:STDOUT: !16 = !{!17}
+// CHECK:STDOUT: !17 = !DILocalVariable(arg: 1, scope: !12, type: !15)
+// CHECK:STDOUT: !18 = !DILocation(line: 7, column: 3, scope: !12)
+// CHECK:STDOUT: !19 = !DILocation(line: 8, column: 3, scope: !12)
+// CHECK:STDOUT: !20 = !DILocation(line: 6, column: 1, scope: !12)
 // CHECK:STDOUT: ; ModuleID = 'call_thunk.carbon'
 // CHECK:STDOUT: source_filename = "call_thunk.carbon"
 // CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
@@ -239,82 +269,94 @@ fn Call(n: Cpp.NeedThunk) {
 // CHECK:STDOUT: %struct.NeedThunk = type { i8 }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CCall.Main(ptr %n) #0 !dbg !7 {
+// CHECK:STDOUT: define void @_CCall.Main(ptr %n) #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc7_14.3.temp = alloca i8, align 1, !dbg !13
-// CHECK:STDOUT:   %.loc8_14.3.temp = alloca i8, align 1, !dbg !14
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc7_14.3.temp), !dbg !13
-// CHECK:STDOUT:   store i8 1, ptr %.loc7_14.3.temp, align 1, !dbg !13
-// CHECK:STDOUT:   call void @_ZNK9NeedThunk8ImplicitEa.carbon_thunk(ptr %n, ptr %.loc7_14.3.temp), !dbg !15
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc8_14.3.temp), !dbg !14
-// CHECK:STDOUT:   store i8 1, ptr %.loc8_14.3.temp, align 1, !dbg !14
-// CHECK:STDOUT:   call void @_ZNH9NeedThunk8ExplicitES_a.carbon_thunk(ptr %n, ptr %.loc8_14.3.temp), !dbg !16
-// CHECK:STDOUT:   ret void, !dbg !17
+// CHECK:STDOUT:   %.loc7_14.3.temp = alloca i8, align 1, !dbg !18
+// CHECK:STDOUT:   %.loc8_14.3.temp = alloca i8, align 1, !dbg !19
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc7_14.3.temp), !dbg !18
+// CHECK:STDOUT:   store i8 1, ptr %.loc7_14.3.temp, align 1, !dbg !18
+// CHECK:STDOUT:   call void @_ZNK9NeedThunk8ImplicitEa.carbon_thunk(ptr %n, ptr %.loc7_14.3.temp), !dbg !20
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc8_14.3.temp), !dbg !19
+// CHECK:STDOUT:   store i8 1, ptr %.loc8_14.3.temp, align 1, !dbg !19
+// CHECK:STDOUT:   call void @_ZNH9NeedThunk8ExplicitES_a.carbon_thunk(ptr %n, ptr %.loc8_14.3.temp), !dbg !21
+// CHECK:STDOUT:   ret void, !dbg !22
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
 // CHECK:STDOUT: declare void @llvm.lifetime.start.p0(ptr captures(none)) #1
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local void @_ZNK9NeedThunk8ImplicitEa.carbon_thunk(ptr nonnull align 1 dereferenceable(1) %this, ptr %c) #2 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local void @_ZNK9NeedThunk8ImplicitEa.carbon_thunk(ptr noundef nonnull align 1 dereferenceable(1) %this, ptr noundef %c) #2 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %this.addr = alloca ptr, align 8
 // CHECK:STDOUT:   %c.addr = alloca ptr, align 8
-// CHECK:STDOUT:   store ptr %this, ptr %this.addr, align 8
-// CHECK:STDOUT:   store ptr %c, ptr %c.addr, align 8
-// CHECK:STDOUT:   %0 = load ptr, ptr %this.addr, align 8, !nonnull !18
-// CHECK:STDOUT:   %1 = load ptr, ptr %c.addr, align 8
-// CHECK:STDOUT:   %2 = load i8, ptr %1, align 1
-// CHECK:STDOUT:   call void @_ZNK9NeedThunk8ImplicitEa(ptr nonnull align 1 dereferenceable(1) %0, i8 signext %2)
+// CHECK:STDOUT:   store ptr %this, ptr %this.addr, align 8, !tbaa !23
+// CHECK:STDOUT:   store ptr %c, ptr %c.addr, align 8, !tbaa !26
+// CHECK:STDOUT:   %0 = load ptr, ptr %this.addr, align 8, !tbaa !23, !nonnull !28
+// CHECK:STDOUT:   %1 = load ptr, ptr %c.addr, align 8, !tbaa !26
+// CHECK:STDOUT:   %2 = load i8, ptr %1, align 1, !tbaa !29
+// CHECK:STDOUT:   call void @_ZNK9NeedThunk8ImplicitEa(ptr noundef nonnull align 1 dereferenceable(1) %0, i8 noundef signext %2)
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare void @_ZNK9NeedThunk8ImplicitEa(ptr nonnull align 1 dereferenceable(1), i8 signext) #3
+// CHECK:STDOUT: declare void @_ZNK9NeedThunk8ImplicitEa(ptr noundef nonnull align 1 dereferenceable(1), i8 noundef signext) #3
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local void @_ZNH9NeedThunk8ExplicitES_a.carbon_thunk(ptr %0, ptr %c) #2 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local void @_ZNH9NeedThunk8ExplicitES_a.carbon_thunk(ptr noundef %0, ptr noundef %c) #2 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %.addr = alloca ptr, align 8
 // CHECK:STDOUT:   %c.addr = alloca ptr, align 8
 // CHECK:STDOUT:   %agg.tmp = alloca %struct.NeedThunk, align 1
-// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8
-// CHECK:STDOUT:   store ptr %c, ptr %c.addr, align 8
-// CHECK:STDOUT:   %1 = load ptr, ptr %.addr, align 8
-// CHECK:STDOUT:   %2 = load ptr, ptr %c.addr, align 8
-// CHECK:STDOUT:   %3 = load i8, ptr %2, align 1
-// CHECK:STDOUT:   call void @_ZNH9NeedThunk8ExplicitES_a(i8 signext %3)
+// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8, !tbaa !23
+// CHECK:STDOUT:   store ptr %c, ptr %c.addr, align 8, !tbaa !26
+// CHECK:STDOUT:   %1 = load ptr, ptr %.addr, align 8, !tbaa !23
+// CHECK:STDOUT:   %2 = load ptr, ptr %c.addr, align 8, !tbaa !26
+// CHECK:STDOUT:   %3 = load i8, ptr %2, align 1, !tbaa !29
+// CHECK:STDOUT:   call void @_ZNH9NeedThunk8ExplicitES_a(i8 noundef signext %3)
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare void @_ZNH9NeedThunk8ExplicitES_a(i8 signext) #3
+// CHECK:STDOUT: declare void @_ZNH9NeedThunk8ExplicitES_a(i8 noundef signext) #3
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; uselistorder directives
 // CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 1, 0 }
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
-// CHECK:STDOUT: attributes #2 = { alwaysinline mustprogress "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
-// CHECK:STDOUT: attributes #3 = { "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #2 = { alwaysinline mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #3 = { "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "call_thunk.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "Call", linkageName: "_CCall.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !11)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{null, !10}
-// CHECK:STDOUT: !10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
-// CHECK:STDOUT: !11 = !{!12}
-// CHECK:STDOUT: !12 = !DILocalVariable(arg: 1, scope: !7, type: !10)
-// CHECK:STDOUT: !13 = !DILocation(line: 7, column: 14, scope: !7)
-// CHECK:STDOUT: !14 = !DILocation(line: 8, column: 14, scope: !7)
-// CHECK:STDOUT: !15 = !DILocation(line: 7, column: 3, scope: !7)
-// CHECK:STDOUT: !16 = !DILocation(line: 8, column: 3, scope: !7)
-// CHECK:STDOUT: !17 = !DILocation(line: 6, column: 1, scope: !7)
-// CHECK:STDOUT: !18 = !{}
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "call_thunk.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "Call", linkageName: "_CCall.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !16)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{null, !15}
+// CHECK:STDOUT: !15 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
+// CHECK:STDOUT: !16 = !{!17}
+// CHECK:STDOUT: !17 = !DILocalVariable(arg: 1, scope: !12, type: !15)
+// CHECK:STDOUT: !18 = !DILocation(line: 7, column: 14, scope: !12)
+// CHECK:STDOUT: !19 = !DILocation(line: 8, column: 14, scope: !12)
+// CHECK:STDOUT: !20 = !DILocation(line: 7, column: 3, scope: !12)
+// CHECK:STDOUT: !21 = !DILocation(line: 8, column: 3, scope: !12)
+// CHECK:STDOUT: !22 = !DILocation(line: 6, column: 1, scope: !12)
+// CHECK:STDOUT: !23 = !{!24, !24, i64 0}
+// CHECK:STDOUT: !24 = !{!"p1 _ZTS9NeedThunk", !25, i64 0}
+// CHECK:STDOUT: !25 = !{!"any pointer", !10, i64 0}
+// CHECK:STDOUT: !26 = !{!27, !27, i64 0}
+// CHECK:STDOUT: !27 = !{!"p1 omnipotent char", !25, i64 0}
+// CHECK:STDOUT: !28 = !{}
+// CHECK:STDOUT: !29 = !{!10, !10, i64 0}

toolchain/lower/testdata/interop/cpp/nullptr.carbon

@@ -55,20 +55,20 @@ fn ConvertNullptrConstant() -> Core.Optional(i32*) {
 // CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CPassNullptr.Main() #0 !dbg !7 {
+// CHECK:STDOUT: define void @_CPassNullptr.Main() #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc12_18.2.temp = alloca ptr, align 8, !dbg !10
-// CHECK:STDOUT:   %.loc14_22.1.temp = alloca ptr, align 8, !dbg !11
-// CHECK:STDOUT:   %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.95db8d3a03540861.Core.b88d1103f417c6d4"(ptr poison), !dbg !10
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc12_18.2.temp), !dbg !10
-// CHECK:STDOUT:   store ptr %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call, ptr %.loc12_18.2.temp, align 8, !dbg !10
-// CHECK:STDOUT:   %.loc12_18.4 = load ptr, ptr %.loc12_18.2.temp, align 8, !dbg !10
-// CHECK:STDOUT:   call void @_Z7TakePtrPi(ptr %.loc12_18.4), !dbg !12
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc14_22.1.temp), !dbg !11
-// CHECK:STDOUT:   %Cpp.nullptr_t.as.Copy.impl.Op.call = call ptr @"_COp.NullptrT.CppCompat.Core:Copy.Core"(ptr poison), !dbg !11
-// CHECK:STDOUT:   store ptr %Cpp.nullptr_t.as.Copy.impl.Op.call, ptr %.loc14_22.1.temp, align 8, !dbg !11
-// CHECK:STDOUT:   call void @_Z11TakeNullptrDn.carbon_thunk(ptr %.loc14_22.1.temp), !dbg !13
-// CHECK:STDOUT:   ret void, !dbg !14
+// CHECK:STDOUT:   %.loc12_18.2.temp = alloca ptr, align 8, !dbg !15
+// CHECK:STDOUT:   %.loc14_22.1.temp = alloca ptr, align 8, !dbg !16
+// CHECK:STDOUT:   %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.95db8d3a03540861.Core.b88d1103f417c6d4"(ptr poison), !dbg !15
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc12_18.2.temp), !dbg !15
+// CHECK:STDOUT:   store ptr %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call, ptr %.loc12_18.2.temp, align 8, !dbg !15
+// CHECK:STDOUT:   %.loc12_18.4 = load ptr, ptr %.loc12_18.2.temp, align 8, !dbg !15
+// CHECK:STDOUT:   call void @_Z7TakePtrPi(ptr %.loc12_18.4), !dbg !17
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc14_22.1.temp), !dbg !16
+// CHECK:STDOUT:   %Cpp.nullptr_t.as.Copy.impl.Op.call = call ptr @"_COp.NullptrT.CppCompat.Core:Copy.Core"(ptr poison), !dbg !16
+// CHECK:STDOUT:   store ptr %Cpp.nullptr_t.as.Copy.impl.Op.call, ptr %.loc14_22.1.temp, align 8, !dbg !16
+// CHECK:STDOUT:   call void @_Z11TakeNullptrDn.carbon_thunk(ptr %.loc14_22.1.temp), !dbg !18
+// CHECK:STDOUT:   ret void, !dbg !19
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: declare void @_Z7TakePtrPi(ptr)
@@ -76,61 +76,61 @@ fn ConvertNullptrConstant() -> Core.Optional(i32*) {
 // CHECK:STDOUT: declare ptr @"_COp.NullptrT.CppCompat.Core:Copy.Core"(ptr)
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define ptr @_CReturnNullptr.Main() #0 !dbg !15 {
+// CHECK:STDOUT: define ptr @_CReturnNullptr.Main() #0 !dbg !20 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %Cpp.nullptr_t.as.Copy.impl.Op.call = call ptr @"_COp.NullptrT.CppCompat.Core:Copy.Core"(ptr poison), !dbg !19
-// CHECK:STDOUT:   ret ptr %Cpp.nullptr_t.as.Copy.impl.Op.call, !dbg !20
+// CHECK:STDOUT:   %Cpp.nullptr_t.as.Copy.impl.Op.call = call ptr @"_COp.NullptrT.CppCompat.Core:Copy.Core"(ptr poison), !dbg !24
+// CHECK:STDOUT:   ret ptr %Cpp.nullptr_t.as.Copy.impl.Op.call, !dbg !25
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define ptr @_CReturnNullptrCopy.Main() #0 !dbg !21 {
-// CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %a.var = alloca ptr, align 8, !dbg !22
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %a.var), !dbg !22
-// CHECK:STDOUT:   %Cpp.nullptr_t.as.Copy.impl.Op.call.loc22 = call ptr @"_COp.NullptrT.CppCompat.Core:Copy.Core"(ptr poison), !dbg !23
-// CHECK:STDOUT:   store ptr %Cpp.nullptr_t.as.Copy.impl.Op.call.loc22, ptr %a.var, align 8, !dbg !22
-// CHECK:STDOUT:   %.loc23 = load ptr, ptr %a.var, align 8, !dbg !24
-// CHECK:STDOUT:   %Cpp.nullptr_t.as.Copy.impl.Op.call.loc23 = call ptr @"_COp.NullptrT.CppCompat.Core:Copy.Core"(ptr %.loc23), !dbg !24
-// CHECK:STDOUT:   ret ptr %Cpp.nullptr_t.as.Copy.impl.Op.call.loc23, !dbg !25
-// CHECK:STDOUT: }
-// CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define ptr @_CReturnConvertedNullptrIndirectly.Main() #0 !dbg !26 {
+// CHECK:STDOUT: define ptr @_CReturnNullptrCopy.Main() #0 !dbg !26 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %a.var = alloca ptr, align 8, !dbg !27
-// CHECK:STDOUT:   %.loc27_44.1.temp = alloca ptr, align 8, !dbg !28
 // CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %a.var), !dbg !27
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc27_44.1.temp), !dbg !28
-// CHECK:STDOUT:   call void @_Z13ReturnNullptrv.carbon_thunk(ptr %.loc27_44.1.temp), !dbg !28
-// CHECK:STDOUT:   %.loc27_44.2 = load ptr, ptr %.loc27_44.1.temp, align 8, !dbg !28
-// CHECK:STDOUT:   store ptr %.loc27_44.2, ptr %a.var, align 8, !dbg !27
-// CHECK:STDOUT:   %.loc28_10 = load ptr, ptr %a.var, align 8, !dbg !29
-// CHECK:STDOUT:   %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.95db8d3a03540861.Core.b88d1103f417c6d4"(ptr %.loc28_10), !dbg !30
-// CHECK:STDOUT:   ret ptr %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call, !dbg !30
+// CHECK:STDOUT:   %Cpp.nullptr_t.as.Copy.impl.Op.call.loc22 = call ptr @"_COp.NullptrT.CppCompat.Core:Copy.Core"(ptr poison), !dbg !28
+// CHECK:STDOUT:   store ptr %Cpp.nullptr_t.as.Copy.impl.Op.call.loc22, ptr %a.var, align 8, !dbg !27
+// CHECK:STDOUT:   %.loc23 = load ptr, ptr %a.var, align 8, !dbg !29
+// CHECK:STDOUT:   %Cpp.nullptr_t.as.Copy.impl.Op.call.loc23 = call ptr @"_COp.NullptrT.CppCompat.Core:Copy.Core"(ptr %.loc23), !dbg !29
+// CHECK:STDOUT:   ret ptr %Cpp.nullptr_t.as.Copy.impl.Op.call.loc23, !dbg !30
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define ptr @_CReturnConvertedNullptrDirectly.Main() #0 !dbg !31 {
+// CHECK:STDOUT: define ptr @_CReturnConvertedNullptrIndirectly.Main() #0 !dbg !31 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc32_28.1.temp = alloca ptr, align 8, !dbg !32
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc32_28.1.temp), !dbg !32
-// CHECK:STDOUT:   call void @_Z13ReturnNullptrv.carbon_thunk(ptr %.loc32_28.1.temp), !dbg !32
-// CHECK:STDOUT:   %.loc32_28.2 = load ptr, ptr %.loc32_28.1.temp, align 8, !dbg !32
-// CHECK:STDOUT:   %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.95db8d3a03540861.Core.b88d1103f417c6d4"(ptr %.loc32_28.2), !dbg !33
-// CHECK:STDOUT:   ret ptr %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call, !dbg !33
-// CHECK:STDOUT: }
-// CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define ptr @_CConvertNullptrConstant.Main() #0 !dbg !34 {
-// CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.95db8d3a03540861.Core.b88d1103f417c6d4"(ptr poison), !dbg !35
+// CHECK:STDOUT:   %a.var = alloca ptr, align 8, !dbg !32
+// CHECK:STDOUT:   %.loc27_44.1.temp = alloca ptr, align 8, !dbg !33
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %a.var), !dbg !32
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc27_44.1.temp), !dbg !33
+// CHECK:STDOUT:   call void @_Z13ReturnNullptrv.carbon_thunk(ptr %.loc27_44.1.temp), !dbg !33
+// CHECK:STDOUT:   %.loc27_44.2 = load ptr, ptr %.loc27_44.1.temp, align 8, !dbg !33
+// CHECK:STDOUT:   store ptr %.loc27_44.2, ptr %a.var, align 8, !dbg !32
+// CHECK:STDOUT:   %.loc28_10 = load ptr, ptr %a.var, align 8, !dbg !34
+// CHECK:STDOUT:   %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.95db8d3a03540861.Core.b88d1103f417c6d4"(ptr %.loc28_10), !dbg !35
 // CHECK:STDOUT:   ret ptr %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call, !dbg !35
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define linkonce_odr ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.95db8d3a03540861.Core.b88d1103f417c6d4"(ptr %self) #0 !dbg !36 {
-// CHECK:STDOUT:   %1 = call ptr @_CNone.Optional.Core.7bfe1822cd6dd563(), !dbg !42
-// CHECK:STDOUT:   ret ptr %1, !dbg !43
+// CHECK:STDOUT: define ptr @_CReturnConvertedNullptrDirectly.Main() #0 !dbg !36 {
+// CHECK:STDOUT: entry:
+// CHECK:STDOUT:   %.loc32_28.1.temp = alloca ptr, align 8, !dbg !37
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc32_28.1.temp), !dbg !37
+// CHECK:STDOUT:   call void @_Z13ReturnNullptrv.carbon_thunk(ptr %.loc32_28.1.temp), !dbg !37
+// CHECK:STDOUT:   %.loc32_28.2 = load ptr, ptr %.loc32_28.1.temp, align 8, !dbg !37
+// CHECK:STDOUT:   %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.95db8d3a03540861.Core.b88d1103f417c6d4"(ptr %.loc32_28.2), !dbg !38
+// CHECK:STDOUT:   ret ptr %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call, !dbg !38
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: ; Function Attrs: nounwind
+// CHECK:STDOUT: define ptr @_CConvertNullptrConstant.Main() #0 !dbg !39 {
+// CHECK:STDOUT: entry:
+// CHECK:STDOUT:   %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.95db8d3a03540861.Core.b88d1103f417c6d4"(ptr poison), !dbg !40
+// CHECK:STDOUT:   ret ptr %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call, !dbg !40
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: ; Function Attrs: nounwind
+// CHECK:STDOUT: define linkonce_odr ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.95db8d3a03540861.Core.b88d1103f417c6d4"(ptr %self) #0 !dbg !41 {
+// CHECK:STDOUT:   %1 = call ptr @_CNone.Optional.Core.7bfe1822cd6dd563(), !dbg !47
+// CHECK:STDOUT:   ret ptr %1, !dbg !48
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
@@ -139,30 +139,30 @@ fn ConvertNullptrConstant() -> Core.Optional(i32*) {
 // CHECK:STDOUT: declare ptr @_CMake.NullptrT.CppCompat.Core()
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define linkonce_odr ptr @_CNone.Optional.Core.7bfe1822cd6dd563() #0 !dbg !44 {
-// CHECK:STDOUT:   ret ptr null, !dbg !46
+// CHECK:STDOUT: define linkonce_odr ptr @_CNone.Optional.Core.7bfe1822cd6dd563() #0 !dbg !49 {
+// CHECK:STDOUT:   ret ptr null, !dbg !51
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local void @_Z11TakeNullptrDn.carbon_thunk(ptr %n) #2 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local void @_Z11TakeNullptrDn.carbon_thunk(ptr noundef %n) #2 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %n.addr = alloca ptr, align 8
-// CHECK:STDOUT:   store ptr %n, ptr %n.addr, align 8
-// CHECK:STDOUT:   %0 = load ptr, ptr %n.addr, align 8
+// CHECK:STDOUT:   store ptr %n, ptr %n.addr, align 8, !tbaa !52
+// CHECK:STDOUT:   %0 = load ptr, ptr %n.addr, align 8, !tbaa !52
 // CHECK:STDOUT:   call void @_Z11TakeNullptrDn(ptr null)
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: declare void @_Z11TakeNullptrDn(ptr) #3
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local void @_Z13ReturnNullptrv.carbon_thunk(ptr %return) #2 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local void @_Z13ReturnNullptrv.carbon_thunk(ptr noundef %return) #2 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %return.addr = alloca ptr, align 8
-// CHECK:STDOUT:   store ptr %return, ptr %return.addr, align 8
-// CHECK:STDOUT:   %0 = load ptr, ptr %return.addr, align 8
+// CHECK:STDOUT:   store ptr %return, ptr %return.addr, align 8, !tbaa !52
+// CHECK:STDOUT:   %0 = load ptr, ptr %return.addr, align 8, !tbaa !52
 // CHECK:STDOUT:   %call = call ptr @_Z13ReturnNullptrv()
-// CHECK:STDOUT:   store ptr %call, ptr %0, align 8
+// CHECK:STDOUT:   store ptr %call, ptr %0, align 8, !tbaa !55
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -174,56 +174,67 @@ fn ConvertNullptrConstant() -> Core.Optional(i32*) {
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
-// CHECK:STDOUT: attributes #2 = { alwaysinline mustprogress "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
-// CHECK:STDOUT: attributes #3 = { "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #2 = { alwaysinline mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #3 = { "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "simple.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "PassNullptr", linkageName: "_CPassNullptr.Main", scope: null, file: !6, line: 11, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{null}
-// CHECK:STDOUT: !10 = !DILocation(line: 12, column: 15, scope: !7)
-// CHECK:STDOUT: !11 = !DILocation(line: 14, column: 19, scope: !7)
-// CHECK:STDOUT: !12 = !DILocation(line: 12, column: 3, scope: !7)
-// CHECK:STDOUT: !13 = !DILocation(line: 14, column: 3, scope: !7)
-// CHECK:STDOUT: !14 = !DILocation(line: 11, column: 1, scope: !7)
-// CHECK:STDOUT: !15 = distinct !DISubprogram(name: "ReturnNullptr", linkageName: "_CReturnNullptr.Main", scope: null, file: !6, line: 17, type: !16, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !16 = !DISubroutineType(types: !17)
-// CHECK:STDOUT: !17 = !{!18}
-// CHECK:STDOUT: !18 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
-// CHECK:STDOUT: !19 = !DILocation(line: 18, column: 10, scope: !15)
-// CHECK:STDOUT: !20 = !DILocation(line: 18, column: 3, scope: !15)
-// CHECK:STDOUT: !21 = distinct !DISubprogram(name: "ReturnNullptrCopy", linkageName: "_CReturnNullptrCopy.Main", scope: null, file: !6, line: 21, type: !16, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !22 = !DILocation(line: 22, column: 3, scope: !21)
-// CHECK:STDOUT: !23 = !DILocation(line: 22, column: 26, scope: !21)
-// CHECK:STDOUT: !24 = !DILocation(line: 23, column: 10, scope: !21)
-// CHECK:STDOUT: !25 = !DILocation(line: 23, column: 3, scope: !21)
-// CHECK:STDOUT: !26 = distinct !DISubprogram(name: "ReturnConvertedNullptrIndirectly", linkageName: "_CReturnConvertedNullptrIndirectly.Main", scope: null, file: !6, line: 26, type: !16, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !27 = !DILocation(line: 27, column: 3, scope: !26)
-// CHECK:STDOUT: !28 = !DILocation(line: 27, column: 26, scope: !26)
-// CHECK:STDOUT: !29 = !DILocation(line: 28, column: 10, scope: !26)
-// CHECK:STDOUT: !30 = !DILocation(line: 28, column: 3, scope: !26)
-// CHECK:STDOUT: !31 = distinct !DISubprogram(name: "ReturnConvertedNullptrDirectly", linkageName: "_CReturnConvertedNullptrDirectly.Main", scope: null, file: !6, line: 31, type: !16, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !32 = !DILocation(line: 32, column: 10, scope: !31)
-// CHECK:STDOUT: !33 = !DILocation(line: 32, column: 3, scope: !31)
-// CHECK:STDOUT: !34 = distinct !DISubprogram(name: "ConvertNullptrConstant", linkageName: "_CConvertNullptrConstant.Main", scope: null, file: !6, line: 35, type: !16, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !35 = !DILocation(line: 36, column: 3, scope: !34)
-// CHECK:STDOUT: !36 = distinct !DISubprogram(name: "Convert", linkageName: "_CConvert.NullptrT.CppCompat.Core:ImplicitAs.95db8d3a03540861.Core.b88d1103f417c6d4", scope: null, file: !37, line: 46, type: !38, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !40)
-// CHECK:STDOUT: !37 = !DIFile(filename: "{{.*}}/prelude/types/cpp/nullptr.carbon", directory: "")
-// CHECK:STDOUT: !38 = !DISubroutineType(types: !39)
-// CHECK:STDOUT: !39 = !{!18, !18}
-// CHECK:STDOUT: !40 = !{!41}
-// CHECK:STDOUT: !41 = !DILocalVariable(arg: 1, scope: !36, type: !18)
-// CHECK:STDOUT: !42 = !DILocation(line: 47, column: 14, scope: !36)
-// CHECK:STDOUT: !43 = !DILocation(line: 47, column: 7, scope: !36)
-// CHECK:STDOUT: !44 = distinct !DISubprogram(name: "None", linkageName: "_CNone.Optional.Core.7bfe1822cd6dd563", scope: null, file: !45, line: 26, type: !16, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !45 = !DIFile(filename: "{{.*}}/prelude/types/optional.carbon", directory: "")
-// CHECK:STDOUT: !46 = !DILocation(line: 27, column: 5, scope: !44)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "simple.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "PassNullptr", linkageName: "_CPassNullptr.Main", scope: null, file: !7, line: 11, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{null}
+// CHECK:STDOUT: !15 = !DILocation(line: 12, column: 15, scope: !12)
+// CHECK:STDOUT: !16 = !DILocation(line: 14, column: 19, scope: !12)
+// CHECK:STDOUT: !17 = !DILocation(line: 12, column: 3, scope: !12)
+// CHECK:STDOUT: !18 = !DILocation(line: 14, column: 3, scope: !12)
+// CHECK:STDOUT: !19 = !DILocation(line: 11, column: 1, scope: !12)
+// CHECK:STDOUT: !20 = distinct !DISubprogram(name: "ReturnNullptr", linkageName: "_CReturnNullptr.Main", scope: null, file: !7, line: 17, type: !21, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !21 = !DISubroutineType(types: !22)
+// CHECK:STDOUT: !22 = !{!23}
+// CHECK:STDOUT: !23 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
+// CHECK:STDOUT: !24 = !DILocation(line: 18, column: 10, scope: !20)
+// CHECK:STDOUT: !25 = !DILocation(line: 18, column: 3, scope: !20)
+// CHECK:STDOUT: !26 = distinct !DISubprogram(name: "ReturnNullptrCopy", linkageName: "_CReturnNullptrCopy.Main", scope: null, file: !7, line: 21, type: !21, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !27 = !DILocation(line: 22, column: 3, scope: !26)
+// CHECK:STDOUT: !28 = !DILocation(line: 22, column: 26, scope: !26)
+// CHECK:STDOUT: !29 = !DILocation(line: 23, column: 10, scope: !26)
+// CHECK:STDOUT: !30 = !DILocation(line: 23, column: 3, scope: !26)
+// CHECK:STDOUT: !31 = distinct !DISubprogram(name: "ReturnConvertedNullptrIndirectly", linkageName: "_CReturnConvertedNullptrIndirectly.Main", scope: null, file: !7, line: 26, type: !21, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !32 = !DILocation(line: 27, column: 3, scope: !31)
+// CHECK:STDOUT: !33 = !DILocation(line: 27, column: 26, scope: !31)
+// CHECK:STDOUT: !34 = !DILocation(line: 28, column: 10, scope: !31)
+// CHECK:STDOUT: !35 = !DILocation(line: 28, column: 3, scope: !31)
+// CHECK:STDOUT: !36 = distinct !DISubprogram(name: "ReturnConvertedNullptrDirectly", linkageName: "_CReturnConvertedNullptrDirectly.Main", scope: null, file: !7, line: 31, type: !21, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !37 = !DILocation(line: 32, column: 10, scope: !36)
+// CHECK:STDOUT: !38 = !DILocation(line: 32, column: 3, scope: !36)
+// CHECK:STDOUT: !39 = distinct !DISubprogram(name: "ConvertNullptrConstant", linkageName: "_CConvertNullptrConstant.Main", scope: null, file: !7, line: 35, type: !21, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !40 = !DILocation(line: 36, column: 3, scope: !39)
+// CHECK:STDOUT: !41 = distinct !DISubprogram(name: "Convert", linkageName: "_CConvert.NullptrT.CppCompat.Core:ImplicitAs.95db8d3a03540861.Core.b88d1103f417c6d4", scope: null, file: !42, line: 46, type: !43, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !45)
+// CHECK:STDOUT: !42 = !DIFile(filename: "{{.*}}/prelude/types/cpp/nullptr.carbon", directory: "")
+// CHECK:STDOUT: !43 = !DISubroutineType(types: !44)
+// CHECK:STDOUT: !44 = !{!23, !23}
+// CHECK:STDOUT: !45 = !{!46}
+// CHECK:STDOUT: !46 = !DILocalVariable(arg: 1, scope: !41, type: !23)
+// CHECK:STDOUT: !47 = !DILocation(line: 47, column: 14, scope: !41)
+// CHECK:STDOUT: !48 = !DILocation(line: 47, column: 7, scope: !41)
+// CHECK:STDOUT: !49 = distinct !DISubprogram(name: "None", linkageName: "_CNone.Optional.Core.7bfe1822cd6dd563", scope: null, file: !50, line: 26, type: !21, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !50 = !DIFile(filename: "{{.*}}/prelude/types/optional.carbon", directory: "")
+// CHECK:STDOUT: !51 = !DILocation(line: 27, column: 5, scope: !49)
+// CHECK:STDOUT: !52 = !{!53, !53, i64 0}
+// CHECK:STDOUT: !53 = !{!"p1 std::nullptr_t", !54, i64 0}
+// CHECK:STDOUT: !54 = !{!"any pointer", !10, i64 0}
+// CHECK:STDOUT: !55 = !{!56, !56, i64 0}
+// CHECK:STDOUT: !56 = !{!"std::nullptr_t", !10, i64 0}

toolchain/lower/testdata/interop/cpp/parameters.carbon

@@ -116,159 +116,175 @@ fn PassValueExpr(y: Cpp.Y) {
 // CHECK:STDOUT: @_Cc.Main = global i16 0
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CMyF.Main() #0 !dbg !7 {
+// CHECK:STDOUT: define void @_CMyF.Main() #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc7_19.3.temp = alloca i8, align 1, !dbg !10
-// CHECK:STDOUT:   %.loc7_22.3.temp = alloca i16, align 2, !dbg !11
-// CHECK:STDOUT:   %.loc9_21.3.temp = alloca i8, align 1, !dbg !12
-// CHECK:STDOUT:   %.loc9_24.3.temp = alloca i16, align 2, !dbg !13
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc7_19.3.temp), !dbg !10
-// CHECK:STDOUT:   store i8 1, ptr %.loc7_19.3.temp, align 1, !dbg !10
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc7_22.3.temp), !dbg !11
-// CHECK:STDOUT:   store i16 2, ptr %.loc7_22.3.temp, align 2, !dbg !11
-// CHECK:STDOUT:   call void @_Z11pass_signedasil.carbon_thunk(ptr %.loc7_19.3.temp, ptr %.loc7_22.3.temp, i32 3, i64 4), !dbg !14
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc9_21.3.temp), !dbg !12
-// CHECK:STDOUT:   store i8 1, ptr %.loc9_21.3.temp, align 1, !dbg !12
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc9_24.3.temp), !dbg !13
-// CHECK:STDOUT:   store i16 2, ptr %.loc9_24.3.temp, align 2, !dbg !13
-// CHECK:STDOUT:   call void @_Z13pass_unsignedhtjm.carbon_thunk(ptr %.loc9_21.3.temp, ptr %.loc9_24.3.temp, i32 3, i64 4), !dbg !15
-// CHECK:STDOUT:   ret void, !dbg !16
+// CHECK:STDOUT:   %.loc7_19.3.temp = alloca i8, align 1, !dbg !15
+// CHECK:STDOUT:   %.loc7_22.3.temp = alloca i16, align 2, !dbg !16
+// CHECK:STDOUT:   %.loc9_21.3.temp = alloca i8, align 1, !dbg !17
+// CHECK:STDOUT:   %.loc9_24.3.temp = alloca i16, align 2, !dbg !18
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc7_19.3.temp), !dbg !15
+// CHECK:STDOUT:   store i8 1, ptr %.loc7_19.3.temp, align 1, !dbg !15
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc7_22.3.temp), !dbg !16
+// CHECK:STDOUT:   store i16 2, ptr %.loc7_22.3.temp, align 2, !dbg !16
+// CHECK:STDOUT:   call void @_Z11pass_signedasil.carbon_thunk(ptr %.loc7_19.3.temp, ptr %.loc7_22.3.temp, i32 3, i64 4), !dbg !19
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc9_21.3.temp), !dbg !17
+// CHECK:STDOUT:   store i8 1, ptr %.loc9_21.3.temp, align 1, !dbg !17
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc9_24.3.temp), !dbg !18
+// CHECK:STDOUT:   store i16 2, ptr %.loc9_24.3.temp, align 2, !dbg !18
+// CHECK:STDOUT:   call void @_Z13pass_unsignedhtjm.carbon_thunk(ptr %.loc9_21.3.temp, ptr %.loc9_24.3.temp, i32 3, i64 4), !dbg !20
+// CHECK:STDOUT:   ret void, !dbg !21
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: declare i16 @_CMakeShort.Main()
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CPassShort.Main(i16 %a, ptr %b) #0 !dbg !17 {
+// CHECK:STDOUT: define void @_CPassShort.Main(i16 %a, ptr %b) #0 !dbg !22 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc17_18.1.temp = alloca i16, align 2, !dbg !25
-// CHECK:STDOUT:   %.loc18_18.3.temp = alloca i16, align 2, !dbg !26
-// CHECK:STDOUT:   %.loc19_18.2.temp = alloca i16, align 2, !dbg !27
-// CHECK:STDOUT:   %.loc20_28.3.temp = alloca i16, align 2, !dbg !28
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc17_18.1.temp), !dbg !25
-// CHECK:STDOUT:   store i16 %a, ptr %.loc17_18.1.temp, align 2, !dbg !25
-// CHECK:STDOUT:   call void @_Z10pass_shorts.carbon_thunk(ptr %.loc17_18.1.temp), !dbg !29
-// CHECK:STDOUT:   %.loc18_18.2 = load i16, ptr %b, align 2, !dbg !26
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc18_18.3.temp), !dbg !26
-// CHECK:STDOUT:   store i16 %.loc18_18.2, ptr %.loc18_18.3.temp, align 2, !dbg !26
-// CHECK:STDOUT:   call void @_Z10pass_shorts.carbon_thunk(ptr %.loc18_18.3.temp), !dbg !30
-// CHECK:STDOUT:   %.loc19_18.1 = load i16, ptr @_Cc.Main, align 2, !dbg !27
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc19_18.2.temp), !dbg !27
-// CHECK:STDOUT:   store i16 %.loc19_18.1, ptr %.loc19_18.2.temp, align 2, !dbg !27
-// CHECK:STDOUT:   call void @_Z10pass_shorts.carbon_thunk(ptr %.loc19_18.2.temp), !dbg !31
-// CHECK:STDOUT:   %MakeShort.call = call i16 @_CMakeShort.Main(), !dbg !28
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc20_28.3.temp), !dbg !28
-// CHECK:STDOUT:   store i16 %MakeShort.call, ptr %.loc20_28.3.temp, align 2, !dbg !28
-// CHECK:STDOUT:   call void @_Z10pass_shorts.carbon_thunk(ptr %.loc20_28.3.temp), !dbg !32
-// CHECK:STDOUT:   ret void, !dbg !33
+// CHECK:STDOUT:   %.loc17_18.1.temp = alloca i16, align 2, !dbg !30
+// CHECK:STDOUT:   %.loc18_18.3.temp = alloca i16, align 2, !dbg !31
+// CHECK:STDOUT:   %.loc19_18.2.temp = alloca i16, align 2, !dbg !32
+// CHECK:STDOUT:   %.loc20_28.3.temp = alloca i16, align 2, !dbg !33
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc17_18.1.temp), !dbg !30
+// CHECK:STDOUT:   store i16 %a, ptr %.loc17_18.1.temp, align 2, !dbg !30
+// CHECK:STDOUT:   call void @_Z10pass_shorts.carbon_thunk(ptr %.loc17_18.1.temp), !dbg !34
+// CHECK:STDOUT:   %.loc18_18.2 = load i16, ptr %b, align 2, !dbg !31
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc18_18.3.temp), !dbg !31
+// CHECK:STDOUT:   store i16 %.loc18_18.2, ptr %.loc18_18.3.temp, align 2, !dbg !31
+// CHECK:STDOUT:   call void @_Z10pass_shorts.carbon_thunk(ptr %.loc18_18.3.temp), !dbg !35
+// CHECK:STDOUT:   %.loc19_18.1 = load i16, ptr @_Cc.Main, align 2, !dbg !32
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc19_18.2.temp), !dbg !32
+// CHECK:STDOUT:   store i16 %.loc19_18.1, ptr %.loc19_18.2.temp, align 2, !dbg !32
+// CHECK:STDOUT:   call void @_Z10pass_shorts.carbon_thunk(ptr %.loc19_18.2.temp), !dbg !36
+// CHECK:STDOUT:   %MakeShort.call = call i16 @_CMakeShort.Main(), !dbg !33
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc20_28.3.temp), !dbg !33
+// CHECK:STDOUT:   store i16 %MakeShort.call, ptr %.loc20_28.3.temp, align 2, !dbg !33
+// CHECK:STDOUT:   call void @_Z10pass_shorts.carbon_thunk(ptr %.loc20_28.3.temp), !dbg !37
+// CHECK:STDOUT:   ret void, !dbg !38
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
 // CHECK:STDOUT: declare void @llvm.lifetime.start.p0(ptr captures(none)) #1
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local void @_Z11pass_signedasil.carbon_thunk(ptr %0, ptr %1, i32 %2, i64 %3) #2 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local void @_Z11pass_signedasil.carbon_thunk(ptr noundef %0, ptr noundef %1, i32 noundef %2, i64 noundef %3) #2 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %.addr = alloca ptr, align 8
 // CHECK:STDOUT:   %.addr1 = alloca ptr, align 8
 // CHECK:STDOUT:   %.addr2 = alloca i32, align 4
 // CHECK:STDOUT:   %.addr3 = alloca i64, align 8
-// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8
-// CHECK:STDOUT:   store ptr %1, ptr %.addr1, align 8
-// CHECK:STDOUT:   store i32 %2, ptr %.addr2, align 4
-// CHECK:STDOUT:   store i64 %3, ptr %.addr3, align 8
-// CHECK:STDOUT:   %4 = load ptr, ptr %.addr, align 8
-// CHECK:STDOUT:   %5 = load i8, ptr %4, align 1
-// CHECK:STDOUT:   %6 = load ptr, ptr %.addr1, align 8
-// CHECK:STDOUT:   %7 = load i16, ptr %6, align 2
-// CHECK:STDOUT:   %8 = load i32, ptr %.addr2, align 4
-// CHECK:STDOUT:   %9 = load i64, ptr %.addr3, align 8
-// CHECK:STDOUT:   call void @_Z11pass_signedasil(i8 signext %5, i16 signext %7, i32 %8, i64 %9)
+// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8, !tbaa !39
+// CHECK:STDOUT:   store ptr %1, ptr %.addr1, align 8, !tbaa !42
+// CHECK:STDOUT:   store i32 %2, ptr %.addr2, align 4, !tbaa !8
+// CHECK:STDOUT:   store i64 %3, ptr %.addr3, align 8, !tbaa !44
+// CHECK:STDOUT:   %4 = load ptr, ptr %.addr, align 8, !tbaa !39
+// CHECK:STDOUT:   %5 = load i8, ptr %4, align 1, !tbaa !46
+// CHECK:STDOUT:   %6 = load ptr, ptr %.addr1, align 8, !tbaa !42
+// CHECK:STDOUT:   %7 = load i16, ptr %6, align 2, !tbaa !47
+// CHECK:STDOUT:   %8 = load i32, ptr %.addr2, align 4, !tbaa !8
+// CHECK:STDOUT:   %9 = load i64, ptr %.addr3, align 8, !tbaa !44
+// CHECK:STDOUT:   call void @_Z11pass_signedasil(i8 noundef signext %5, i16 noundef signext %7, i32 noundef %8, i64 noundef %9)
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare void @_Z11pass_signedasil(i8 signext, i16 signext, i32, i64) #3
+// CHECK:STDOUT: declare void @_Z11pass_signedasil(i8 noundef signext, i16 noundef signext, i32 noundef, i64 noundef) #3
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local void @_Z13pass_unsignedhtjm.carbon_thunk(ptr %0, ptr %1, i32 %2, i64 %3) #2 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local void @_Z13pass_unsignedhtjm.carbon_thunk(ptr noundef %0, ptr noundef %1, i32 noundef %2, i64 noundef %3) #2 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %.addr = alloca ptr, align 8
 // CHECK:STDOUT:   %.addr1 = alloca ptr, align 8
 // CHECK:STDOUT:   %.addr2 = alloca i32, align 4
 // CHECK:STDOUT:   %.addr3 = alloca i64, align 8
-// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8
-// CHECK:STDOUT:   store ptr %1, ptr %.addr1, align 8
-// CHECK:STDOUT:   store i32 %2, ptr %.addr2, align 4
-// CHECK:STDOUT:   store i64 %3, ptr %.addr3, align 8
-// CHECK:STDOUT:   %4 = load ptr, ptr %.addr, align 8
-// CHECK:STDOUT:   %5 = load i8, ptr %4, align 1
-// CHECK:STDOUT:   %6 = load ptr, ptr %.addr1, align 8
-// CHECK:STDOUT:   %7 = load i16, ptr %6, align 2
-// CHECK:STDOUT:   %8 = load i32, ptr %.addr2, align 4
-// CHECK:STDOUT:   %9 = load i64, ptr %.addr3, align 8
-// CHECK:STDOUT:   call void @_Z13pass_unsignedhtjm(i8 zeroext %5, i16 zeroext %7, i32 %8, i64 %9)
+// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8, !tbaa !39
+// CHECK:STDOUT:   store ptr %1, ptr %.addr1, align 8, !tbaa !42
+// CHECK:STDOUT:   store i32 %2, ptr %.addr2, align 4, !tbaa !8
+// CHECK:STDOUT:   store i64 %3, ptr %.addr3, align 8, !tbaa !44
+// CHECK:STDOUT:   %4 = load ptr, ptr %.addr, align 8, !tbaa !39
+// CHECK:STDOUT:   %5 = load i8, ptr %4, align 1, !tbaa !46
+// CHECK:STDOUT:   %6 = load ptr, ptr %.addr1, align 8, !tbaa !42
+// CHECK:STDOUT:   %7 = load i16, ptr %6, align 2, !tbaa !47
+// CHECK:STDOUT:   %8 = load i32, ptr %.addr2, align 4, !tbaa !8
+// CHECK:STDOUT:   %9 = load i64, ptr %.addr3, align 8, !tbaa !44
+// CHECK:STDOUT:   call void @_Z13pass_unsignedhtjm(i8 noundef zeroext %5, i16 noundef zeroext %7, i32 noundef %8, i64 noundef %9)
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare void @_Z13pass_unsignedhtjm(i8 zeroext, i16 zeroext, i32, i64) #3
+// CHECK:STDOUT: declare void @_Z13pass_unsignedhtjm(i8 noundef zeroext, i16 noundef zeroext, i32 noundef, i64 noundef) #3
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local void @_Z10pass_shorts.carbon_thunk(ptr %0) #2 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local void @_Z10pass_shorts.carbon_thunk(ptr noundef %0) #2 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %.addr = alloca ptr, align 8
-// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8
-// CHECK:STDOUT:   %1 = load ptr, ptr %.addr, align 8
-// CHECK:STDOUT:   %2 = load i16, ptr %1, align 2
-// CHECK:STDOUT:   call void @_Z10pass_shorts(i16 signext %2)
+// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8, !tbaa !42
+// CHECK:STDOUT:   %1 = load ptr, ptr %.addr, align 8, !tbaa !42
+// CHECK:STDOUT:   %2 = load i16, ptr %1, align 2, !tbaa !47
+// CHECK:STDOUT:   call void @_Z10pass_shorts(i16 noundef signext %2)
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare void @_Z10pass_shorts(i16 signext) #3
+// CHECK:STDOUT: declare void @_Z10pass_shorts(i16 noundef signext) #3
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; uselistorder directives
 // CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 7, 6, 5, 4, 3, 2, 1, 0 }
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
-// CHECK:STDOUT: attributes #2 = { alwaysinline mustprogress "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
-// CHECK:STDOUT: attributes #3 = { "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #2 = { alwaysinline mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #3 = { "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "import_ints.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{null}
-// CHECK:STDOUT: !10 = !DILocation(line: 7, column: 19, scope: !7)
-// CHECK:STDOUT: !11 = !DILocation(line: 7, column: 22, scope: !7)
-// CHECK:STDOUT: !12 = !DILocation(line: 9, column: 21, scope: !7)
-// CHECK:STDOUT: !13 = !DILocation(line: 9, column: 24, scope: !7)
-// CHECK:STDOUT: !14 = !DILocation(line: 7, column: 3, scope: !7)
-// CHECK:STDOUT: !15 = !DILocation(line: 9, column: 3, scope: !7)
-// CHECK:STDOUT: !16 = !DILocation(line: 6, column: 1, scope: !7)
-// CHECK:STDOUT: !17 = distinct !DISubprogram(name: "PassShort", linkageName: "_CPassShort.Main", scope: null, file: !6, line: 16, type: !18, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !22)
-// CHECK:STDOUT: !18 = !DISubroutineType(types: !19)
-// CHECK:STDOUT: !19 = !{null, !20, !21}
-// CHECK:STDOUT: !20 = !DIBasicType(name: "int", size: 16, encoding: DW_ATE_signed)
-// CHECK:STDOUT: !21 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
-// CHECK:STDOUT: !22 = !{!23, !24}
-// CHECK:STDOUT: !23 = !DILocalVariable(arg: 1, scope: !17, type: !20)
-// CHECK:STDOUT: !24 = !DILocalVariable(arg: 2, scope: !17, type: !21)
-// CHECK:STDOUT: !25 = !DILocation(line: 17, column: 18, scope: !17)
-// CHECK:STDOUT: !26 = !DILocation(line: 18, column: 18, scope: !17)
-// CHECK:STDOUT: !27 = !DILocation(line: 19, column: 18, scope: !17)
-// CHECK:STDOUT: !28 = !DILocation(line: 20, column: 18, scope: !17)
-// CHECK:STDOUT: !29 = !DILocation(line: 17, column: 3, scope: !17)
-// CHECK:STDOUT: !30 = !DILocation(line: 18, column: 3, scope: !17)
-// CHECK:STDOUT: !31 = !DILocation(line: 19, column: 3, scope: !17)
-// CHECK:STDOUT: !32 = !DILocation(line: 20, column: 3, scope: !17)
-// CHECK:STDOUT: !33 = !DILocation(line: 16, column: 1, scope: !17)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "import_ints.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{null}
+// CHECK:STDOUT: !15 = !DILocation(line: 7, column: 19, scope: !12)
+// CHECK:STDOUT: !16 = !DILocation(line: 7, column: 22, scope: !12)
+// CHECK:STDOUT: !17 = !DILocation(line: 9, column: 21, scope: !12)
+// CHECK:STDOUT: !18 = !DILocation(line: 9, column: 24, scope: !12)
+// CHECK:STDOUT: !19 = !DILocation(line: 7, column: 3, scope: !12)
+// CHECK:STDOUT: !20 = !DILocation(line: 9, column: 3, scope: !12)
+// CHECK:STDOUT: !21 = !DILocation(line: 6, column: 1, scope: !12)
+// CHECK:STDOUT: !22 = distinct !DISubprogram(name: "PassShort", linkageName: "_CPassShort.Main", scope: null, file: !7, line: 16, type: !23, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !27)
+// CHECK:STDOUT: !23 = !DISubroutineType(types: !24)
+// CHECK:STDOUT: !24 = !{null, !25, !26}
+// CHECK:STDOUT: !25 = !DIBasicType(name: "int", size: 16, encoding: DW_ATE_signed)
+// CHECK:STDOUT: !26 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
+// CHECK:STDOUT: !27 = !{!28, !29}
+// CHECK:STDOUT: !28 = !DILocalVariable(arg: 1, scope: !22, type: !25)
+// CHECK:STDOUT: !29 = !DILocalVariable(arg: 2, scope: !22, type: !26)
+// CHECK:STDOUT: !30 = !DILocation(line: 17, column: 18, scope: !22)
+// CHECK:STDOUT: !31 = !DILocation(line: 18, column: 18, scope: !22)
+// CHECK:STDOUT: !32 = !DILocation(line: 19, column: 18, scope: !22)
+// CHECK:STDOUT: !33 = !DILocation(line: 20, column: 18, scope: !22)
+// CHECK:STDOUT: !34 = !DILocation(line: 17, column: 3, scope: !22)
+// CHECK:STDOUT: !35 = !DILocation(line: 18, column: 3, scope: !22)
+// CHECK:STDOUT: !36 = !DILocation(line: 19, column: 3, scope: !22)
+// CHECK:STDOUT: !37 = !DILocation(line: 20, column: 3, scope: !22)
+// CHECK:STDOUT: !38 = !DILocation(line: 16, column: 1, scope: !22)
+// CHECK:STDOUT: !39 = !{!40, !40, i64 0}
+// CHECK:STDOUT: !40 = !{!"p1 omnipotent char", !41, i64 0}
+// CHECK:STDOUT: !41 = !{!"any pointer", !10, i64 0}
+// CHECK:STDOUT: !42 = !{!43, !43, i64 0}
+// CHECK:STDOUT: !43 = !{!"p1 short", !41, i64 0}
+// CHECK:STDOUT: !44 = !{!45, !45, i64 0}
+// CHECK:STDOUT: !45 = !{!"long", !10, i64 0}
+// CHECK:STDOUT: !46 = !{!10, !10, i64 0}
+// CHECK:STDOUT: !47 = !{!48, !48, i64 0}
+// CHECK:STDOUT: !48 = !{!"short", !10, i64 0}
 // CHECK:STDOUT: ; ModuleID = 'import_struct.carbon'
 // CHECK:STDOUT: source_filename = "import_struct.carbon"
 // CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
@@ -277,32 +293,32 @@ fn PassValueExpr(y: Cpp.Y) {
 // CHECK:STDOUT: %struct.X = type { i32, i32, i32 }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CTest.Main() #0 !dbg !7 {
+// CHECK:STDOUT: define void @_CTest.Main() #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %x.var = alloca [12 x i8], align 1, !dbg !10
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %x.var), !dbg !10
-// CHECK:STDOUT:   %.loc8_4.a = getelementptr inbounds nuw [12 x i8], ptr %x.var, i32 0, i32 0, !dbg !11
-// CHECK:STDOUT:   store i32 1, ptr %.loc8_4.a, align 4, !dbg !11
-// CHECK:STDOUT:   %.loc9_4.b = getelementptr inbounds nuw [12 x i8], ptr %x.var, i32 0, i32 4, !dbg !12
-// CHECK:STDOUT:   store i32 2, ptr %.loc9_4.b, align 4, !dbg !12
-// CHECK:STDOUT:   %.loc10_4.c = getelementptr inbounds nuw [12 x i8], ptr %x.var, i32 0, i32 8, !dbg !13
-// CHECK:STDOUT:   store i32 3, ptr %.loc10_4.c, align 4, !dbg !13
-// CHECK:STDOUT:   call void @_Z11pass_struct1X.carbon_thunk(ptr %x.var), !dbg !14
-// CHECK:STDOUT:   ret void, !dbg !15
+// CHECK:STDOUT:   %x.var = alloca [12 x i8], align 1, !dbg !15
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %x.var), !dbg !15
+// CHECK:STDOUT:   %.loc8_4.a = getelementptr inbounds nuw [12 x i8], ptr %x.var, i32 0, i32 0, !dbg !16
+// CHECK:STDOUT:   store i32 1, ptr %.loc8_4.a, align 4, !dbg !16
+// CHECK:STDOUT:   %.loc9_4.b = getelementptr inbounds nuw [12 x i8], ptr %x.var, i32 0, i32 4, !dbg !17
+// CHECK:STDOUT:   store i32 2, ptr %.loc9_4.b, align 4, !dbg !17
+// CHECK:STDOUT:   %.loc10_4.c = getelementptr inbounds nuw [12 x i8], ptr %x.var, i32 0, i32 8, !dbg !18
+// CHECK:STDOUT:   store i32 3, ptr %.loc10_4.c, align 4, !dbg !18
+// CHECK:STDOUT:   call void @_Z11pass_struct1X.carbon_thunk(ptr %x.var), !dbg !19
+// CHECK:STDOUT:   ret void, !dbg !20
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
 // CHECK:STDOUT: declare void @llvm.lifetime.start.p0(ptr captures(none)) #1
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local void @_Z11pass_struct1X.carbon_thunk(ptr %0) #2 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local void @_Z11pass_struct1X.carbon_thunk(ptr noundef %0) #2 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %.addr = alloca ptr, align 8
 // CHECK:STDOUT:   %agg.tmp = alloca %struct.X, align 4
 // CHECK:STDOUT:   %agg.tmp.coerce = alloca { i64, i32 }, align 4
-// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8
-// CHECK:STDOUT:   %1 = load ptr, ptr %.addr, align 8
-// CHECK:STDOUT:   call void @llvm.memcpy.p0.p0.i64(ptr align 4 %agg.tmp, ptr align 4 %1, i64 12, i1 false)
+// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8, !tbaa !21
+// CHECK:STDOUT:   %1 = load ptr, ptr %.addr, align 8, !tbaa !21
+// CHECK:STDOUT:   call void @llvm.memcpy.p0.p0.i64(ptr align 4 %agg.tmp, ptr align 4 %1, i64 12, i1 false), !tbaa.struct !24
 // CHECK:STDOUT:   call void @llvm.memcpy.p0.p0.i64(ptr align 4 %agg.tmp.coerce, ptr align 4 %agg.tmp, i64 12, i1 false)
 // CHECK:STDOUT:   %2 = getelementptr inbounds nuw { i64, i32 }, ptr %agg.tmp.coerce, i32 0, i32 0
 // CHECK:STDOUT:   %3 = load i64, ptr %2, align 4
@@ -322,29 +338,39 @@ fn PassValueExpr(y: Cpp.Y) {
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
-// CHECK:STDOUT: attributes #2 = { alwaysinline mustprogress "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #2 = { alwaysinline mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
 // CHECK:STDOUT: attributes #3 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
-// CHECK:STDOUT: attributes #4 = { "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #4 = { "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "import_struct.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "Test", linkageName: "_CTest.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{null}
-// CHECK:STDOUT: !10 = !DILocation(line: 7, column: 3, scope: !7)
-// CHECK:STDOUT: !11 = !DILocation(line: 8, column: 3, scope: !7)
-// CHECK:STDOUT: !12 = !DILocation(line: 9, column: 3, scope: !7)
-// CHECK:STDOUT: !13 = !DILocation(line: 10, column: 3, scope: !7)
-// CHECK:STDOUT: !14 = !DILocation(line: 11, column: 3, scope: !7)
-// CHECK:STDOUT: !15 = !DILocation(line: 6, column: 1, scope: !7)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "import_struct.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "Test", linkageName: "_CTest.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{null}
+// CHECK:STDOUT: !15 = !DILocation(line: 7, column: 3, scope: !12)
+// CHECK:STDOUT: !16 = !DILocation(line: 8, column: 3, scope: !12)
+// CHECK:STDOUT: !17 = !DILocation(line: 9, column: 3, scope: !12)
+// CHECK:STDOUT: !18 = !DILocation(line: 10, column: 3, scope: !12)
+// CHECK:STDOUT: !19 = !DILocation(line: 11, column: 3, scope: !12)
+// CHECK:STDOUT: !20 = !DILocation(line: 6, column: 1, scope: !12)
+// CHECK:STDOUT: !21 = !{!22, !22, i64 0}
+// CHECK:STDOUT: !22 = !{!"p1 _ZTS1X", !23, i64 0}
+// CHECK:STDOUT: !23 = !{!"any pointer", !10, i64 0}
+// CHECK:STDOUT: !24 = !{i64 0, i64 4, !8, i64 4, i64 4, !8, i64 8, i64 4, !8}
 // CHECK:STDOUT: ; ModuleID = 'import_class_with_nontrivial_copy.carbon'
 // CHECK:STDOUT: source_filename = "import_class_with_nontrivial_copy.carbon"
 // CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
@@ -353,94 +379,103 @@ fn PassValueExpr(y: Cpp.Y) {
 // CHECK:STDOUT: %class.Y = type { i32, i32, i32 }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CPassRefExpr.Main() #0 !dbg !7 {
+// CHECK:STDOUT: define void @_CPassRefExpr.Main() #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %y.var = alloca [12 x i8], align 1, !dbg !10
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %y.var), !dbg !10
-// CHECK:STDOUT:   %.loc8_4.a = getelementptr inbounds nuw [12 x i8], ptr %y.var, i32 0, i32 0, !dbg !11
-// CHECK:STDOUT:   store i32 1, ptr %.loc8_4.a, align 4, !dbg !11
-// CHECK:STDOUT:   %.loc9_4.b = getelementptr inbounds nuw [12 x i8], ptr %y.var, i32 0, i32 4, !dbg !12
-// CHECK:STDOUT:   store i32 2, ptr %.loc9_4.b, align 4, !dbg !12
-// CHECK:STDOUT:   %.loc10_4.c = getelementptr inbounds nuw [12 x i8], ptr %y.var, i32 0, i32 8, !dbg !13
-// CHECK:STDOUT:   store i32 3, ptr %.loc10_4.c, align 4, !dbg !13
-// CHECK:STDOUT:   call void @_Z11pass_struct1Y.carbon_thunk(ptr %y.var), !dbg !14
-// CHECK:STDOUT:   ret void, !dbg !15
+// CHECK:STDOUT:   %y.var = alloca [12 x i8], align 1, !dbg !15
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %y.var), !dbg !15
+// CHECK:STDOUT:   %.loc8_4.a = getelementptr inbounds nuw [12 x i8], ptr %y.var, i32 0, i32 0, !dbg !16
+// CHECK:STDOUT:   store i32 1, ptr %.loc8_4.a, align 4, !dbg !16
+// CHECK:STDOUT:   %.loc9_4.b = getelementptr inbounds nuw [12 x i8], ptr %y.var, i32 0, i32 4, !dbg !17
+// CHECK:STDOUT:   store i32 2, ptr %.loc9_4.b, align 4, !dbg !17
+// CHECK:STDOUT:   %.loc10_4.c = getelementptr inbounds nuw [12 x i8], ptr %y.var, i32 0, i32 8, !dbg !18
+// CHECK:STDOUT:   store i32 3, ptr %.loc10_4.c, align 4, !dbg !18
+// CHECK:STDOUT:   call void @_Z11pass_struct1Y.carbon_thunk(ptr %y.var), !dbg !19
+// CHECK:STDOUT:   ret void, !dbg !20
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: declare void @_CMake.Main(ptr sret([12 x i8]))
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CPassInitExpr.Main() #0 !dbg !16 {
+// CHECK:STDOUT: define void @_CPassInitExpr.Main() #0 !dbg !21 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc17_24.1.temp = alloca [12 x i8], align 1, !dbg !17
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc17_24.1.temp), !dbg !17
-// CHECK:STDOUT:   call void @_CMake.Main(ptr %.loc17_24.1.temp), !dbg !17
-// CHECK:STDOUT:   call void @_Z11pass_struct1Y.carbon_thunk(ptr %.loc17_24.1.temp), !dbg !18
-// CHECK:STDOUT:   ret void, !dbg !19
+// CHECK:STDOUT:   %.loc17_24.1.temp = alloca [12 x i8], align 1, !dbg !22
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc17_24.1.temp), !dbg !22
+// CHECK:STDOUT:   call void @_CMake.Main(ptr %.loc17_24.1.temp), !dbg !22
+// CHECK:STDOUT:   call void @_Z11pass_struct1Y.carbon_thunk(ptr %.loc17_24.1.temp), !dbg !23
+// CHECK:STDOUT:   ret void, !dbg !24
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CPassValueExpr.Main(ptr %y) #0 !dbg !20 {
+// CHECK:STDOUT: define void @_CPassValueExpr.Main(ptr %y) #0 !dbg !25 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   call void @_Z11pass_struct1Y.carbon_thunk(ptr %y), !dbg !26
-// CHECK:STDOUT:   ret void, !dbg !27
+// CHECK:STDOUT:   call void @_Z11pass_struct1Y.carbon_thunk(ptr %y), !dbg !31
+// CHECK:STDOUT:   ret void, !dbg !32
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
 // CHECK:STDOUT: declare void @llvm.lifetime.start.p0(ptr captures(none)) #1
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local void @_Z11pass_struct1Y.carbon_thunk(ptr %0) #2 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local void @_Z11pass_struct1Y.carbon_thunk(ptr noundef %0) #2 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %.addr = alloca ptr, align 8
 // CHECK:STDOUT:   %agg.tmp = alloca %class.Y, align 4
-// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8
-// CHECK:STDOUT:   %1 = load ptr, ptr %.addr, align 8
-// CHECK:STDOUT:   call void @_ZN1YC1ERKS_(ptr nonnull align 4 dereferenceable(12) %agg.tmp, ptr nonnull align 4 dereferenceable(12) %1)
-// CHECK:STDOUT:   call void @_Z11pass_struct1Y(ptr dead_on_return %agg.tmp)
+// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8, !tbaa !33
+// CHECK:STDOUT:   %1 = load ptr, ptr %.addr, align 8, !tbaa !33
+// CHECK:STDOUT:   call void @_ZN1YC1ERKS_(ptr noundef nonnull align 4 dereferenceable(12) %agg.tmp, ptr noundef nonnull align 4 dereferenceable(12) %1)
+// CHECK:STDOUT:   call void @_Z11pass_struct1Y(ptr dead_on_return noundef %agg.tmp)
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare void @_ZN1YC1ERKS_(ptr nonnull align 4 dereferenceable(12), ptr nonnull align 4 dereferenceable(12)) unnamed_addr #3
+// CHECK:STDOUT: declare void @_ZN1YC1ERKS_(ptr noundef nonnull align 4 dereferenceable(12), ptr noundef nonnull align 4 dereferenceable(12)) unnamed_addr #3
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare void @_Z11pass_struct1Y(ptr dead_on_return) #3
+// CHECK:STDOUT: declare void @_Z11pass_struct1Y(ptr dead_on_return noundef) #3
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; uselistorder directives
 // CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 1, 0 }
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
-// CHECK:STDOUT: attributes #2 = { alwaysinline mustprogress "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
-// CHECK:STDOUT: attributes #3 = { "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #2 = { alwaysinline mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #3 = { "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "import_class_with_nontrivial_copy.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "PassRefExpr", linkageName: "_CPassRefExpr.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{null}
-// CHECK:STDOUT: !10 = !DILocation(line: 7, column: 3, scope: !7)
-// CHECK:STDOUT: !11 = !DILocation(line: 8, column: 3, scope: !7)
-// CHECK:STDOUT: !12 = !DILocation(line: 9, column: 3, scope: !7)
-// CHECK:STDOUT: !13 = !DILocation(line: 10, column: 3, scope: !7)
-// CHECK:STDOUT: !14 = !DILocation(line: 11, column: 3, scope: !7)
-// CHECK:STDOUT: !15 = !DILocation(line: 6, column: 1, scope: !7)
-// CHECK:STDOUT: !16 = distinct !DISubprogram(name: "PassInitExpr", linkageName: "_CPassInitExpr.Main", scope: null, file: !6, line: 16, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !17 = !DILocation(line: 17, column: 19, scope: !16)
-// CHECK:STDOUT: !18 = !DILocation(line: 17, column: 3, scope: !16)
-// CHECK:STDOUT: !19 = !DILocation(line: 16, column: 1, scope: !16)
-// CHECK:STDOUT: !20 = distinct !DISubprogram(name: "PassValueExpr", linkageName: "_CPassValueExpr.Main", scope: null, file: !6, line: 20, type: !21, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !24)
-// CHECK:STDOUT: !21 = !DISubroutineType(types: !22)
-// CHECK:STDOUT: !22 = !{null, !23}
-// CHECK:STDOUT: !23 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
-// CHECK:STDOUT: !24 = !{!25}
-// CHECK:STDOUT: !25 = !DILocalVariable(arg: 1, scope: !20, type: !23)
-// CHECK:STDOUT: !26 = !DILocation(line: 21, column: 3, scope: !20)
-// CHECK:STDOUT: !27 = !DILocation(line: 20, column: 1, scope: !20)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "import_class_with_nontrivial_copy.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "PassRefExpr", linkageName: "_CPassRefExpr.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{null}
+// CHECK:STDOUT: !15 = !DILocation(line: 7, column: 3, scope: !12)
+// CHECK:STDOUT: !16 = !DILocation(line: 8, column: 3, scope: !12)
+// CHECK:STDOUT: !17 = !DILocation(line: 9, column: 3, scope: !12)
+// CHECK:STDOUT: !18 = !DILocation(line: 10, column: 3, scope: !12)
+// CHECK:STDOUT: !19 = !DILocation(line: 11, column: 3, scope: !12)
+// CHECK:STDOUT: !20 = !DILocation(line: 6, column: 1, scope: !12)
+// CHECK:STDOUT: !21 = distinct !DISubprogram(name: "PassInitExpr", linkageName: "_CPassInitExpr.Main", scope: null, file: !7, line: 16, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !22 = !DILocation(line: 17, column: 19, scope: !21)
+// CHECK:STDOUT: !23 = !DILocation(line: 17, column: 3, scope: !21)
+// CHECK:STDOUT: !24 = !DILocation(line: 16, column: 1, scope: !21)
+// CHECK:STDOUT: !25 = distinct !DISubprogram(name: "PassValueExpr", linkageName: "_CPassValueExpr.Main", scope: null, file: !7, line: 20, type: !26, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !29)
+// CHECK:STDOUT: !26 = !DISubroutineType(types: !27)
+// CHECK:STDOUT: !27 = !{null, !28}
+// CHECK:STDOUT: !28 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
+// CHECK:STDOUT: !29 = !{!30}
+// CHECK:STDOUT: !30 = !DILocalVariable(arg: 1, scope: !25, type: !28)
+// CHECK:STDOUT: !31 = !DILocation(line: 21, column: 3, scope: !25)
+// CHECK:STDOUT: !32 = !DILocation(line: 20, column: 1, scope: !25)
+// CHECK:STDOUT: !33 = !{!34, !34, i64 0}
+// CHECK:STDOUT: !34 = !{!"p1 _ZTS1Y", !35, i64 0}
+// CHECK:STDOUT: !35 = !{!"any pointer", !10, i64 0}

toolchain/lower/testdata/interop/cpp/pointer.carbon

@@ -96,113 +96,9 @@ fn ReturnPtrWithThunk() -> Core.Optional(Cpp.C*) {
 // CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CPassPtr.Main(ptr %p) #0 !dbg !7 {
+// CHECK:STDOUT: define void @_CPassPtr.Main(ptr %p) #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   call void @_Z7TakePtrP1C(ptr %p), !dbg !13
-// CHECK:STDOUT:   ret void, !dbg !14
-// CHECK:STDOUT: }
-// CHECK:STDOUT:
-// CHECK:STDOUT: declare void @_Z7TakePtrP1C(ptr)
-// CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define ptr @_CReturnPtr.Main() #0 !dbg !15 {
-// CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %ReturnPtr.call = call ptr @_Z9ReturnPtrv(), !dbg !18
-// CHECK:STDOUT:   ret ptr %ReturnPtr.call, !dbg !19
-// CHECK:STDOUT: }
-// CHECK:STDOUT:
-// CHECK:STDOUT: declare ptr @_Z9ReturnPtrv()
-// CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CPassPtrWithThunk.Main(ptr %p) #0 !dbg !20 {
-// CHECK:STDOUT: entry:
-// CHECK:STDOUT:   call void @_Z16TakePtrWithThunkP1Ci.carbon_thunk1(ptr %p), !dbg !23
-// CHECK:STDOUT:   ret void, !dbg !24
-// CHECK:STDOUT: }
-// CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define ptr @_CReturnPtrWithThunk.Main() #0 !dbg !25 {
-// CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %ReturnPtrWithThunk__carbon_thunk.call = call ptr @_Z18ReturnPtrWithThunki.carbon_thunk0(), !dbg !26
-// CHECK:STDOUT:   ret ptr %ReturnPtrWithThunk__carbon_thunk.call, !dbg !27
-// CHECK:STDOUT: }
-// CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local void @_Z16TakePtrWithThunkP1Ci.carbon_thunk1(ptr %0) #1 {
-// CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.addr = alloca ptr, align 8
-// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8
-// CHECK:STDOUT:   %1 = load ptr, ptr %.addr, align 8
-// CHECK:STDOUT:   call void @_Z16TakePtrWithThunkP1Ci(ptr %1, i32 0)
-// CHECK:STDOUT:   ret void
-// CHECK:STDOUT: }
-// CHECK:STDOUT:
-// CHECK:STDOUT: declare void @_Z16TakePtrWithThunkP1Ci(ptr, i32) #2
-// CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local ptr @_Z18ReturnPtrWithThunki.carbon_thunk0() #1 {
-// CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %call = call ptr @_Z18ReturnPtrWithThunki(i32 0)
-// CHECK:STDOUT:   ret ptr %call
-// CHECK:STDOUT: }
-// CHECK:STDOUT:
-// CHECK:STDOUT: declare ptr @_Z18ReturnPtrWithThunki(i32) #2
-// CHECK:STDOUT:
-// CHECK:STDOUT: attributes #0 = { nounwind }
-// CHECK:STDOUT: attributes #1 = { alwaysinline mustprogress "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
-// CHECK:STDOUT: attributes #2 = { "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
-// CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
-// CHECK:STDOUT:
-// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
-// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
-// CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
-// CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
-// CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "nonnull.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "PassPtr", linkageName: "_CPassPtr.Main", scope: null, file: !6, line: 14, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !11)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{null, !10}
-// CHECK:STDOUT: !10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
-// CHECK:STDOUT: !11 = !{!12}
-// CHECK:STDOUT: !12 = !DILocalVariable(arg: 1, scope: !7, type: !10)
-// CHECK:STDOUT: !13 = !DILocation(line: 15, column: 3, scope: !7)
-// CHECK:STDOUT: !14 = !DILocation(line: 14, column: 1, scope: !7)
-// CHECK:STDOUT: !15 = distinct !DISubprogram(name: "ReturnPtr", linkageName: "_CReturnPtr.Main", scope: null, file: !6, line: 18, type: !16, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !16 = !DISubroutineType(types: !17)
-// CHECK:STDOUT: !17 = !{!10}
-// CHECK:STDOUT: !18 = !DILocation(line: 19, column: 10, scope: !15)
-// CHECK:STDOUT: !19 = !DILocation(line: 19, column: 3, scope: !15)
-// CHECK:STDOUT: !20 = distinct !DISubprogram(name: "PassPtrWithThunk", linkageName: "_CPassPtrWithThunk.Main", scope: null, file: !6, line: 22, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !21)
-// CHECK:STDOUT: !21 = !{!22}
-// CHECK:STDOUT: !22 = !DILocalVariable(arg: 1, scope: !20, type: !10)
-// CHECK:STDOUT: !23 = !DILocation(line: 23, column: 3, scope: !20)
-// CHECK:STDOUT: !24 = !DILocation(line: 22, column: 1, scope: !20)
-// CHECK:STDOUT: !25 = distinct !DISubprogram(name: "ReturnPtrWithThunk", linkageName: "_CReturnPtrWithThunk.Main", scope: null, file: !6, line: 26, type: !16, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !26 = !DILocation(line: 27, column: 10, scope: !25)
-// CHECK:STDOUT: !27 = !DILocation(line: 27, column: 3, scope: !25)
-// CHECK:STDOUT: ; ModuleID = 'nullable.carbon'
-// CHECK:STDOUT: source_filename = "nullable.carbon"
-// CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
-// CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
-// CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CPassPtr.Main(ptr %_) #0 !dbg !7 {
-// CHECK:STDOUT: entry:
-// CHECK:STDOUT:   ret void, !dbg !13
-// CHECK:STDOUT: }
-// CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CPassNonnullPtr.Main(ptr %p) #0 !dbg !14 {
-// CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc22_15.2.temp = alloca ptr, align 8, !dbg !17
-// CHECK:STDOUT:   %U.binding.as_type.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.e5cf8fcbb4feaae2:ImplicitAs.0f95c9e18c91e00a.Core.5b1b7c6bb83e5c41"(ptr %p), !dbg !17
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc22_15.2.temp), !dbg !17
-// CHECK:STDOUT:   store ptr %U.binding.as_type.as.ImplicitAs.impl.Convert.call, ptr %.loc22_15.2.temp, align 8, !dbg !17
-// CHECK:STDOUT:   %.loc22_15.4 = load ptr, ptr %.loc22_15.2.temp, align 8, !dbg !17
-// CHECK:STDOUT:   call void @_Z7TakePtrP1C(ptr %.loc22_15.4), !dbg !18
+// CHECK:STDOUT:   call void @_Z7TakePtrP1C(ptr %p), !dbg !18
 // CHECK:STDOUT:   ret void, !dbg !19
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -218,80 +114,193 @@ fn ReturnPtrWithThunk() -> Core.Optional(Cpp.C*) {
 // CHECK:STDOUT: declare ptr @_Z9ReturnPtrv()
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CPassPtrWithThunk.Main(ptr %_) #0 !dbg !25 {
+// CHECK:STDOUT: define void @_CPassPtrWithThunk.Main(ptr %p) #0 !dbg !25 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   ret void, !dbg !28
+// CHECK:STDOUT:   call void @_Z16TakePtrWithThunkP1Ci.carbon_thunk1(ptr %p), !dbg !28
+// CHECK:STDOUT:   ret void, !dbg !29
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CPassNonnullPtrWithThunk.Main(ptr %p) #0 !dbg !29 {
+// CHECK:STDOUT: define ptr @_CReturnPtrWithThunk.Main() #0 !dbg !30 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc35_24.2.temp = alloca ptr, align 8, !dbg !32
-// CHECK:STDOUT:   %U.binding.as_type.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.e5cf8fcbb4feaae2:ImplicitAs.0f95c9e18c91e00a.Core.5b1b7c6bb83e5c41"(ptr %p), !dbg !32
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc35_24.2.temp), !dbg !32
-// CHECK:STDOUT:   store ptr %U.binding.as_type.as.ImplicitAs.impl.Convert.call, ptr %.loc35_24.2.temp, align 8, !dbg !32
-// CHECK:STDOUT:   %.loc35_24.4 = load ptr, ptr %.loc35_24.2.temp, align 8, !dbg !32
-// CHECK:STDOUT:   call void @_Z16TakePtrWithThunkP1Ci.carbon_thunk1(ptr %.loc35_24.4), !dbg !33
-// CHECK:STDOUT:   ret void, !dbg !34
+// CHECK:STDOUT:   %ReturnPtrWithThunk__carbon_thunk.call = call ptr @_Z18ReturnPtrWithThunki.carbon_thunk0(), !dbg !31
+// CHECK:STDOUT:   ret ptr %ReturnPtrWithThunk__carbon_thunk.call, !dbg !32
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local void @_Z16TakePtrWithThunkP1Ci.carbon_thunk1(ptr noundef %0) #1 {
+// CHECK:STDOUT: entry:
+// CHECK:STDOUT:   %.addr = alloca ptr, align 8
+// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8, !tbaa !33
+// CHECK:STDOUT:   %1 = load ptr, ptr %.addr, align 8, !tbaa !33
+// CHECK:STDOUT:   call void @_Z16TakePtrWithThunkP1Ci(ptr noundef %1, i32 noundef 0)
+// CHECK:STDOUT:   ret void
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: declare void @_Z16TakePtrWithThunkP1Ci(ptr noundef, i32 noundef) #2
+// CHECK:STDOUT:
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local noundef ptr @_Z18ReturnPtrWithThunki.carbon_thunk0() #1 {
+// CHECK:STDOUT: entry:
+// CHECK:STDOUT:   %call = call noundef ptr @_Z18ReturnPtrWithThunki(i32 noundef 0)
+// CHECK:STDOUT:   ret ptr %call
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: declare noundef ptr @_Z18ReturnPtrWithThunki(i32 noundef) #2
+// CHECK:STDOUT:
+// CHECK:STDOUT: attributes #0 = { nounwind }
+// CHECK:STDOUT: attributes #1 = { alwaysinline mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #2 = { "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT:
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
+// CHECK:STDOUT:
+// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
+// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
+// CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
+// CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
+// CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "nonnull.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "PassPtr", linkageName: "_CPassPtr.Main", scope: null, file: !7, line: 14, type: !13, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !16)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{null, !15}
+// CHECK:STDOUT: !15 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
+// CHECK:STDOUT: !16 = !{!17}
+// CHECK:STDOUT: !17 = !DILocalVariable(arg: 1, scope: !12, type: !15)
+// CHECK:STDOUT: !18 = !DILocation(line: 15, column: 3, scope: !12)
+// CHECK:STDOUT: !19 = !DILocation(line: 14, column: 1, scope: !12)
+// CHECK:STDOUT: !20 = distinct !DISubprogram(name: "ReturnPtr", linkageName: "_CReturnPtr.Main", scope: null, file: !7, line: 18, type: !21, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !21 = !DISubroutineType(types: !22)
+// CHECK:STDOUT: !22 = !{!15}
+// CHECK:STDOUT: !23 = !DILocation(line: 19, column: 10, scope: !20)
+// CHECK:STDOUT: !24 = !DILocation(line: 19, column: 3, scope: !20)
+// CHECK:STDOUT: !25 = distinct !DISubprogram(name: "PassPtrWithThunk", linkageName: "_CPassPtrWithThunk.Main", scope: null, file: !7, line: 22, type: !13, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !26)
+// CHECK:STDOUT: !26 = !{!27}
+// CHECK:STDOUT: !27 = !DILocalVariable(arg: 1, scope: !25, type: !15)
+// CHECK:STDOUT: !28 = !DILocation(line: 23, column: 3, scope: !25)
+// CHECK:STDOUT: !29 = !DILocation(line: 22, column: 1, scope: !25)
+// CHECK:STDOUT: !30 = distinct !DISubprogram(name: "ReturnPtrWithThunk", linkageName: "_CReturnPtrWithThunk.Main", scope: null, file: !7, line: 26, type: !21, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !31 = !DILocation(line: 27, column: 10, scope: !30)
+// CHECK:STDOUT: !32 = !DILocation(line: 27, column: 3, scope: !30)
+// CHECK:STDOUT: !33 = !{!34, !34, i64 0}
+// CHECK:STDOUT: !34 = !{!"p1 _ZTS1C", !35, i64 0}
+// CHECK:STDOUT: !35 = !{!"any pointer", !10, i64 0}
+// CHECK:STDOUT: ; ModuleID = 'nullable.carbon'
+// CHECK:STDOUT: source_filename = "nullable.carbon"
+// CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
+// CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
+// CHECK:STDOUT:
+// CHECK:STDOUT: ; Function Attrs: nounwind
+// CHECK:STDOUT: define void @_CPassPtr.Main(ptr %_) #0 !dbg !12 {
+// CHECK:STDOUT: entry:
+// CHECK:STDOUT:   ret void, !dbg !18
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define ptr @_CReturnPtrWithThunk.Main() #0 !dbg !35 {
+// CHECK:STDOUT: define void @_CPassNonnullPtr.Main(ptr %p) #0 !dbg !19 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %ReturnPtrWithThunk__carbon_thunk.call = call ptr @_Z18ReturnPtrWithThunki.carbon_thunk0(), !dbg !36
-// CHECK:STDOUT:   ret ptr %ReturnPtrWithThunk__carbon_thunk.call, !dbg !37
+// CHECK:STDOUT:   %.loc22_15.2.temp = alloca ptr, align 8, !dbg !22
+// CHECK:STDOUT:   %U.binding.as_type.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.e5cf8fcbb4feaae2:ImplicitAs.0f95c9e18c91e00a.Core.5b1b7c6bb83e5c41"(ptr %p), !dbg !22
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc22_15.2.temp), !dbg !22
+// CHECK:STDOUT:   store ptr %U.binding.as_type.as.ImplicitAs.impl.Convert.call, ptr %.loc22_15.2.temp, align 8, !dbg !22
+// CHECK:STDOUT:   %.loc22_15.4 = load ptr, ptr %.loc22_15.2.temp, align 8, !dbg !22
+// CHECK:STDOUT:   call void @_Z7TakePtrP1C(ptr %.loc22_15.4), !dbg !23
+// CHECK:STDOUT:   ret void, !dbg !24
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: declare void @_Z7TakePtrP1C(ptr)
+// CHECK:STDOUT:
+// CHECK:STDOUT: ; Function Attrs: nounwind
+// CHECK:STDOUT: define ptr @_CReturnPtr.Main() #0 !dbg !25 {
+// CHECK:STDOUT: entry:
+// CHECK:STDOUT:   %ReturnPtr.call = call ptr @_Z9ReturnPtrv(), !dbg !28
+// CHECK:STDOUT:   ret ptr %ReturnPtr.call, !dbg !29
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: declare ptr @_Z9ReturnPtrv()
+// CHECK:STDOUT:
+// CHECK:STDOUT: ; Function Attrs: nounwind
+// CHECK:STDOUT: define void @_CPassPtrWithThunk.Main(ptr %_) #0 !dbg !30 {
+// CHECK:STDOUT: entry:
+// CHECK:STDOUT:   ret void, !dbg !33
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define linkonce_odr ptr @"_CConvert.e5cf8fcbb4feaae2:ImplicitAs.0f95c9e18c91e00a.Core.5b1b7c6bb83e5c41"(ptr %self) #0 !dbg !38 {
-// CHECK:STDOUT:   %1 = call ptr @"_CConvert.90961d7b1ce4f089:OptionalAs.0e326e799dad0c64.Core.ea71e3f17b6b4efb"(ptr %self), !dbg !44
-// CHECK:STDOUT:   ret ptr %1, !dbg !45
+// CHECK:STDOUT: define void @_CPassNonnullPtrWithThunk.Main(ptr %p) #0 !dbg !34 {
+// CHECK:STDOUT: entry:
+// CHECK:STDOUT:   %.loc35_24.2.temp = alloca ptr, align 8, !dbg !37
+// CHECK:STDOUT:   %U.binding.as_type.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.e5cf8fcbb4feaae2:ImplicitAs.0f95c9e18c91e00a.Core.5b1b7c6bb83e5c41"(ptr %p), !dbg !37
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc35_24.2.temp), !dbg !37
+// CHECK:STDOUT:   store ptr %U.binding.as_type.as.ImplicitAs.impl.Convert.call, ptr %.loc35_24.2.temp, align 8, !dbg !37
+// CHECK:STDOUT:   %.loc35_24.4 = load ptr, ptr %.loc35_24.2.temp, align 8, !dbg !37
+// CHECK:STDOUT:   call void @_Z16TakePtrWithThunkP1Ci.carbon_thunk1(ptr %.loc35_24.4), !dbg !38
+// CHECK:STDOUT:   ret void, !dbg !39
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: ; Function Attrs: nounwind
+// CHECK:STDOUT: define ptr @_CReturnPtrWithThunk.Main() #0 !dbg !40 {
+// CHECK:STDOUT: entry:
+// CHECK:STDOUT:   %ReturnPtrWithThunk__carbon_thunk.call = call ptr @_Z18ReturnPtrWithThunki.carbon_thunk0(), !dbg !41
+// CHECK:STDOUT:   ret ptr %ReturnPtrWithThunk__carbon_thunk.call, !dbg !42
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: ; Function Attrs: nounwind
+// CHECK:STDOUT: define linkonce_odr ptr @"_CConvert.e5cf8fcbb4feaae2:ImplicitAs.0f95c9e18c91e00a.Core.5b1b7c6bb83e5c41"(ptr %self) #0 !dbg !43 {
+// CHECK:STDOUT:   %1 = call ptr @"_CConvert.90961d7b1ce4f089:OptionalAs.0e326e799dad0c64.Core.ea71e3f17b6b4efb"(ptr %self), !dbg !49
+// CHECK:STDOUT:   ret ptr %1, !dbg !50
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
 // CHECK:STDOUT: declare void @llvm.lifetime.start.p0(ptr captures(none)) #1
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define linkonce_odr ptr @"_CConvert.90961d7b1ce4f089:OptionalAs.0e326e799dad0c64.Core.ea71e3f17b6b4efb"(ptr %self) #0 !dbg !46 {
-// CHECK:STDOUT:   %1 = call ptr @_CSome.Optional.Core.ea71e3f17b6b4efb(ptr %self), !dbg !49
-// CHECK:STDOUT:   ret ptr %1, !dbg !50
-// CHECK:STDOUT: }
-// CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define linkonce_odr ptr @_CSome.Optional.Core.ea71e3f17b6b4efb(ptr %value) #0 !dbg !51 {
-// CHECK:STDOUT:   %1 = call ptr @"_CSome.e8f8f92d3d08d149:OptionalStorage.Core.f53db17714b9f655"(ptr %value), !dbg !54
+// CHECK:STDOUT: define linkonce_odr ptr @"_CConvert.90961d7b1ce4f089:OptionalAs.0e326e799dad0c64.Core.ea71e3f17b6b4efb"(ptr %self) #0 !dbg !51 {
+// CHECK:STDOUT:   %1 = call ptr @_CSome.Optional.Core.ea71e3f17b6b4efb(ptr %self), !dbg !54
 // CHECK:STDOUT:   ret ptr %1, !dbg !55
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define linkonce_odr ptr @"_CSome.e8f8f92d3d08d149:OptionalStorage.Core.f53db17714b9f655"(ptr %self) #0 !dbg !56 {
-// CHECK:STDOUT:   %1 = alloca ptr, align 8, !dbg !59
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %1), !dbg !59
-// CHECK:STDOUT:   store ptr %self, ptr %1, align 8, !dbg !60
-// CHECK:STDOUT:   %2 = load ptr, ptr %1, align 8, !dbg !61
-// CHECK:STDOUT:   ret ptr %2, !dbg !62
+// CHECK:STDOUT: define linkonce_odr ptr @_CSome.Optional.Core.ea71e3f17b6b4efb(ptr %value) #0 !dbg !56 {
+// CHECK:STDOUT:   %1 = call ptr @"_CSome.e8f8f92d3d08d149:OptionalStorage.Core.f53db17714b9f655"(ptr %value), !dbg !59
+// CHECK:STDOUT:   ret ptr %1, !dbg !60
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local void @_Z16TakePtrWithThunkP1Ci.carbon_thunk1(ptr %0) #2 {
+// CHECK:STDOUT: ; Function Attrs: nounwind
+// CHECK:STDOUT: define linkonce_odr ptr @"_CSome.e8f8f92d3d08d149:OptionalStorage.Core.f53db17714b9f655"(ptr %self) #0 !dbg !61 {
+// CHECK:STDOUT:   %1 = alloca ptr, align 8, !dbg !64
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %1), !dbg !64
+// CHECK:STDOUT:   store ptr %self, ptr %1, align 8, !dbg !65
+// CHECK:STDOUT:   %2 = load ptr, ptr %1, align 8, !dbg !66
+// CHECK:STDOUT:   ret ptr %2, !dbg !67
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local void @_Z16TakePtrWithThunkP1Ci.carbon_thunk1(ptr noundef %0) #2 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %.addr = alloca ptr, align 8
-// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8
-// CHECK:STDOUT:   %1 = load ptr, ptr %.addr, align 8
-// CHECK:STDOUT:   call void @_Z16TakePtrWithThunkP1Ci(ptr %1, i32 0)
+// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8, !tbaa !68
+// CHECK:STDOUT:   %1 = load ptr, ptr %.addr, align 8, !tbaa !68
+// CHECK:STDOUT:   call void @_Z16TakePtrWithThunkP1Ci(ptr noundef %1, i32 noundef 0)
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare void @_Z16TakePtrWithThunkP1Ci(ptr, i32) #3
+// CHECK:STDOUT: declare void @_Z16TakePtrWithThunkP1Ci(ptr noundef, i32 noundef) #3
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local ptr @_Z18ReturnPtrWithThunki.carbon_thunk0() #2 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local noundef ptr @_Z18ReturnPtrWithThunki.carbon_thunk0() #2 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %call = call ptr @_Z18ReturnPtrWithThunki(i32 0)
+// CHECK:STDOUT:   %call = call noundef ptr @_Z18ReturnPtrWithThunki(i32 noundef 0)
 // CHECK:STDOUT:   ret ptr %call
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare ptr @_Z18ReturnPtrWithThunki(i32) #3
+// CHECK:STDOUT: declare noundef ptr @_Z18ReturnPtrWithThunki(i32 noundef) #3
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; uselistorder directives
 // CHECK:STDOUT: uselistorder ptr @"_CConvert.e5cf8fcbb4feaae2:ImplicitAs.0f95c9e18c91e00a.Core.5b1b7c6bb83e5c41", { 1, 0 }
@@ -299,72 +308,81 @@ fn ReturnPtrWithThunk() -> Core.Optional(Cpp.C*) {
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
-// CHECK:STDOUT: attributes #2 = { alwaysinline mustprogress "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
-// CHECK:STDOUT: attributes #3 = { "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #2 = { alwaysinline mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #3 = { "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "nullable.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "PassPtr", linkageName: "_CPassPtr.Main", scope: null, file: !6, line: 14, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !11)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{null, !10}
-// CHECK:STDOUT: !10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
-// CHECK:STDOUT: !11 = !{!12}
-// CHECK:STDOUT: !12 = !DILocalVariable(arg: 1, scope: !7, type: !10)
-// CHECK:STDOUT: !13 = !DILocation(line: 14, column: 1, scope: !7)
-// CHECK:STDOUT: !14 = distinct !DISubprogram(name: "PassNonnullPtr", linkageName: "_CPassNonnullPtr.Main", scope: null, file: !6, line: 19, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !15)
-// CHECK:STDOUT: !15 = !{!16}
-// CHECK:STDOUT: !16 = !DILocalVariable(arg: 1, scope: !14, type: !10)
-// CHECK:STDOUT: !17 = !DILocation(line: 22, column: 15, scope: !14)
-// CHECK:STDOUT: !18 = !DILocation(line: 22, column: 3, scope: !14)
-// CHECK:STDOUT: !19 = !DILocation(line: 19, column: 1, scope: !14)
-// CHECK:STDOUT: !20 = distinct !DISubprogram(name: "ReturnPtr", linkageName: "_CReturnPtr.Main", scope: null, file: !6, line: 25, type: !21, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !21 = !DISubroutineType(types: !22)
-// CHECK:STDOUT: !22 = !{!10}
-// CHECK:STDOUT: !23 = !DILocation(line: 26, column: 10, scope: !20)
-// CHECK:STDOUT: !24 = !DILocation(line: 26, column: 3, scope: !20)
-// CHECK:STDOUT: !25 = distinct !DISubprogram(name: "PassPtrWithThunk", linkageName: "_CPassPtrWithThunk.Main", scope: null, file: !6, line: 29, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !26)
-// CHECK:STDOUT: !26 = !{!27}
-// CHECK:STDOUT: !27 = !DILocalVariable(arg: 1, scope: !25, type: !10)
-// CHECK:STDOUT: !28 = !DILocation(line: 29, column: 1, scope: !25)
-// CHECK:STDOUT: !29 = distinct !DISubprogram(name: "PassNonnullPtrWithThunk", linkageName: "_CPassNonnullPtrWithThunk.Main", scope: null, file: !6, line: 34, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !30)
-// CHECK:STDOUT: !30 = !{!31}
-// CHECK:STDOUT: !31 = !DILocalVariable(arg: 1, scope: !29, type: !10)
-// CHECK:STDOUT: !32 = !DILocation(line: 35, column: 24, scope: !29)
-// CHECK:STDOUT: !33 = !DILocation(line: 35, column: 3, scope: !29)
-// CHECK:STDOUT: !34 = !DILocation(line: 34, column: 1, scope: !29)
-// CHECK:STDOUT: !35 = distinct !DISubprogram(name: "ReturnPtrWithThunk", linkageName: "_CReturnPtrWithThunk.Main", scope: null, file: !6, line: 38, type: !21, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !36 = !DILocation(line: 39, column: 10, scope: !35)
-// CHECK:STDOUT: !37 = !DILocation(line: 39, column: 3, scope: !35)
-// CHECK:STDOUT: !38 = distinct !DISubprogram(name: "Convert", linkageName: "_CConvert.e5cf8fcbb4feaae2:ImplicitAs.0f95c9e18c91e00a.Core.5b1b7c6bb83e5c41", scope: null, file: !39, line: 93, type: !40, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !42)
-// CHECK:STDOUT: !39 = !DIFile(filename: "{{.*}}/prelude/types/optional.carbon", directory: "")
-// CHECK:STDOUT: !40 = !DISubroutineType(types: !41)
-// CHECK:STDOUT: !41 = !{!10, !10}
-// CHECK:STDOUT: !42 = !{!43}
-// CHECK:STDOUT: !43 = !DILocalVariable(arg: 1, scope: !38, type: !10)
-// CHECK:STDOUT: !44 = !DILocation(line: 94, column: 12, scope: !38)
-// CHECK:STDOUT: !45 = !DILocation(line: 94, column: 5, scope: !38)
-// CHECK:STDOUT: !46 = distinct !DISubprogram(name: "Convert", linkageName: "_CConvert.90961d7b1ce4f089:OptionalAs.0e326e799dad0c64.Core.ea71e3f17b6b4efb", scope: null, file: !39, line: 68, type: !40, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !47)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "nullable.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "PassPtr", linkageName: "_CPassPtr.Main", scope: null, file: !7, line: 14, type: !13, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !16)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{null, !15}
+// CHECK:STDOUT: !15 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
+// CHECK:STDOUT: !16 = !{!17}
+// CHECK:STDOUT: !17 = !DILocalVariable(arg: 1, scope: !12, type: !15)
+// CHECK:STDOUT: !18 = !DILocation(line: 14, column: 1, scope: !12)
+// CHECK:STDOUT: !19 = distinct !DISubprogram(name: "PassNonnullPtr", linkageName: "_CPassNonnullPtr.Main", scope: null, file: !7, line: 19, type: !13, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !20)
+// CHECK:STDOUT: !20 = !{!21}
+// CHECK:STDOUT: !21 = !DILocalVariable(arg: 1, scope: !19, type: !15)
+// CHECK:STDOUT: !22 = !DILocation(line: 22, column: 15, scope: !19)
+// CHECK:STDOUT: !23 = !DILocation(line: 22, column: 3, scope: !19)
+// CHECK:STDOUT: !24 = !DILocation(line: 19, column: 1, scope: !19)
+// CHECK:STDOUT: !25 = distinct !DISubprogram(name: "ReturnPtr", linkageName: "_CReturnPtr.Main", scope: null, file: !7, line: 25, type: !26, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !26 = !DISubroutineType(types: !27)
+// CHECK:STDOUT: !27 = !{!15}
+// CHECK:STDOUT: !28 = !DILocation(line: 26, column: 10, scope: !25)
+// CHECK:STDOUT: !29 = !DILocation(line: 26, column: 3, scope: !25)
+// CHECK:STDOUT: !30 = distinct !DISubprogram(name: "PassPtrWithThunk", linkageName: "_CPassPtrWithThunk.Main", scope: null, file: !7, line: 29, type: !13, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !31)
+// CHECK:STDOUT: !31 = !{!32}
+// CHECK:STDOUT: !32 = !DILocalVariable(arg: 1, scope: !30, type: !15)
+// CHECK:STDOUT: !33 = !DILocation(line: 29, column: 1, scope: !30)
+// CHECK:STDOUT: !34 = distinct !DISubprogram(name: "PassNonnullPtrWithThunk", linkageName: "_CPassNonnullPtrWithThunk.Main", scope: null, file: !7, line: 34, type: !13, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !35)
+// CHECK:STDOUT: !35 = !{!36}
+// CHECK:STDOUT: !36 = !DILocalVariable(arg: 1, scope: !34, type: !15)
+// CHECK:STDOUT: !37 = !DILocation(line: 35, column: 24, scope: !34)
+// CHECK:STDOUT: !38 = !DILocation(line: 35, column: 3, scope: !34)
+// CHECK:STDOUT: !39 = !DILocation(line: 34, column: 1, scope: !34)
+// CHECK:STDOUT: !40 = distinct !DISubprogram(name: "ReturnPtrWithThunk", linkageName: "_CReturnPtrWithThunk.Main", scope: null, file: !7, line: 38, type: !26, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !41 = !DILocation(line: 39, column: 10, scope: !40)
+// CHECK:STDOUT: !42 = !DILocation(line: 39, column: 3, scope: !40)
+// CHECK:STDOUT: !43 = distinct !DISubprogram(name: "Convert", linkageName: "_CConvert.e5cf8fcbb4feaae2:ImplicitAs.0f95c9e18c91e00a.Core.5b1b7c6bb83e5c41", scope: null, file: !44, line: 93, type: !45, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !47)
+// CHECK:STDOUT: !44 = !DIFile(filename: "{{.*}}/prelude/types/optional.carbon", directory: "")
+// CHECK:STDOUT: !45 = !DISubroutineType(types: !46)
+// CHECK:STDOUT: !46 = !{!15, !15}
 // CHECK:STDOUT: !47 = !{!48}
-// CHECK:STDOUT: !48 = !DILocalVariable(arg: 1, scope: !46, type: !10)
-// CHECK:STDOUT: !49 = !DILocation(line: 69, column: 12, scope: !46)
-// CHECK:STDOUT: !50 = !DILocation(line: 69, column: 5, scope: !46)
-// CHECK:STDOUT: !51 = distinct !DISubprogram(name: "Some", linkageName: "_CSome.Optional.Core.ea71e3f17b6b4efb", scope: null, file: !39, line: 29, type: !40, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !52)
+// CHECK:STDOUT: !48 = !DILocalVariable(arg: 1, scope: !43, type: !15)
+// CHECK:STDOUT: !49 = !DILocation(line: 94, column: 12, scope: !43)
+// CHECK:STDOUT: !50 = !DILocation(line: 94, column: 5, scope: !43)
+// CHECK:STDOUT: !51 = distinct !DISubprogram(name: "Convert", linkageName: "_CConvert.90961d7b1ce4f089:OptionalAs.0e326e799dad0c64.Core.ea71e3f17b6b4efb", scope: null, file: !44, line: 68, type: !45, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !52)
 // CHECK:STDOUT: !52 = !{!53}
-// CHECK:STDOUT: !53 = !DILocalVariable(arg: 1, scope: !51, type: !10)
-// CHECK:STDOUT: !54 = !DILocation(line: 30, column: 12, scope: !51)
-// CHECK:STDOUT: !55 = !DILocation(line: 30, column: 5, scope: !51)
-// CHECK:STDOUT: !56 = distinct !DISubprogram(name: "Some", linkageName: "_CSome.e8f8f92d3d08d149:OptionalStorage.Core.f53db17714b9f655", scope: null, file: !39, line: 138, type: !40, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !57)
+// CHECK:STDOUT: !53 = !DILocalVariable(arg: 1, scope: !51, type: !15)
+// CHECK:STDOUT: !54 = !DILocation(line: 69, column: 12, scope: !51)
+// CHECK:STDOUT: !55 = !DILocation(line: 69, column: 5, scope: !51)
+// CHECK:STDOUT: !56 = distinct !DISubprogram(name: "Some", linkageName: "_CSome.Optional.Core.ea71e3f17b6b4efb", scope: null, file: !44, line: 29, type: !45, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !57)
 // CHECK:STDOUT: !57 = !{!58}
-// CHECK:STDOUT: !58 = !DILocalVariable(arg: 1, scope: !56, type: !10)
-// CHECK:STDOUT: !59 = !DILocation(line: 139, column: 14, scope: !56)
-// CHECK:STDOUT: !60 = !DILocation(line: 140, column: 5, scope: !56)
-// CHECK:STDOUT: !61 = !DILocation(line: 139, column: 18, scope: !56)
-// CHECK:STDOUT: !62 = !DILocation(line: 141, column: 5, scope: !56)
+// CHECK:STDOUT: !58 = !DILocalVariable(arg: 1, scope: !56, type: !15)
+// CHECK:STDOUT: !59 = !DILocation(line: 30, column: 12, scope: !56)
+// CHECK:STDOUT: !60 = !DILocation(line: 30, column: 5, scope: !56)
+// CHECK:STDOUT: !61 = distinct !DISubprogram(name: "Some", linkageName: "_CSome.e8f8f92d3d08d149:OptionalStorage.Core.f53db17714b9f655", scope: null, file: !44, line: 138, type: !45, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !62)
+// CHECK:STDOUT: !62 = !{!63}
+// CHECK:STDOUT: !63 = !DILocalVariable(arg: 1, scope: !61, type: !15)
+// CHECK:STDOUT: !64 = !DILocation(line: 139, column: 14, scope: !61)
+// CHECK:STDOUT: !65 = !DILocation(line: 140, column: 5, scope: !61)
+// CHECK:STDOUT: !66 = !DILocation(line: 139, column: 18, scope: !61)
+// CHECK:STDOUT: !67 = !DILocation(line: 141, column: 5, scope: !61)
+// CHECK:STDOUT: !68 = !{!69, !69, i64 0}
+// CHECK:STDOUT: !69 = !{!"p1 _ZTS1C", !70, i64 0}
+// CHECK:STDOUT: !70 = !{!"any pointer", !10, i64 0}

toolchain/lower/testdata/interop/cpp/reference.carbon

@@ -136,29 +136,29 @@ fn GetRefs() {
 // CHECK:STDOUT: @C.val.loc19_18.3 = internal constant {} zeroinitializer
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CPassRefs.Main() #0 !dbg !7 {
+// CHECK:STDOUT: define void @_CPassRefs.Main() #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %c.var = alloca {}, align 8, !dbg !10
-// CHECK:STDOUT:   %.loc19_18.2.temp = alloca {}, align 8, !dbg !11
-// CHECK:STDOUT:   %n.var = alloca i32, align 4, !dbg !12
-// CHECK:STDOUT:   %.loc24_22.3.temp = alloca i32, align 4, !dbg !13
-// CHECK:STDOUT:   %.loc25_23.2.temp = alloca i32, align 4, !dbg !14
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %c.var), !dbg !10
-// CHECK:STDOUT:   call void @_Z8TakeCRefR1C(ptr %c.var), !dbg !15
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc19_18.2.temp), !dbg !11
-// CHECK:STDOUT:   call void @llvm.memcpy.p0.p0.i64(ptr align 1 %.loc19_18.2.temp, ptr align 1 @C.val.loc19_18.3, i64 0, i1 false), !dbg !11
-// CHECK:STDOUT:   call void @_Z9TakeCRRefO1C.carbon_thunk(ptr %.loc19_18.2.temp), !dbg !16
-// CHECK:STDOUT:   call void @_Z13TakeConstCRefRK1C.carbon_thunk(ptr %c.var), !dbg !17
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %n.var), !dbg !12
-// CHECK:STDOUT:   call void @_Z10TakeIntRefRi(ptr %n.var), !dbg !18
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc24_22.3.temp), !dbg !13
-// CHECK:STDOUT:   store i32 42, ptr %.loc24_22.3.temp, align 4, !dbg !13
-// CHECK:STDOUT:   call void @_Z11TakeIntRRefOi.carbon_thunk(ptr %.loc24_22.3.temp), !dbg !19
-// CHECK:STDOUT:   %.loc25_23.1 = load i32, ptr %n.var, align 4, !dbg !14
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc25_23.2.temp), !dbg !14
-// CHECK:STDOUT:   store i32 %.loc25_23.1, ptr %.loc25_23.2.temp, align 4, !dbg !14
-// CHECK:STDOUT:   call void @_Z15TakeConstIntRefRKi.carbon_thunk(ptr %.loc25_23.2.temp), !dbg !20
-// CHECK:STDOUT:   ret void, !dbg !21
+// CHECK:STDOUT:   %c.var = alloca {}, align 8, !dbg !15
+// CHECK:STDOUT:   %.loc19_18.2.temp = alloca {}, align 8, !dbg !16
+// CHECK:STDOUT:   %n.var = alloca i32, align 4, !dbg !17
+// CHECK:STDOUT:   %.loc24_22.3.temp = alloca i32, align 4, !dbg !18
+// CHECK:STDOUT:   %.loc25_23.2.temp = alloca i32, align 4, !dbg !19
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %c.var), !dbg !15
+// CHECK:STDOUT:   call void @_Z8TakeCRefR1C(ptr %c.var), !dbg !20
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc19_18.2.temp), !dbg !16
+// CHECK:STDOUT:   call void @llvm.memcpy.p0.p0.i64(ptr align 1 %.loc19_18.2.temp, ptr align 1 @C.val.loc19_18.3, i64 0, i1 false), !dbg !16
+// CHECK:STDOUT:   call void @_Z9TakeCRRefO1C.carbon_thunk(ptr %.loc19_18.2.temp), !dbg !21
+// CHECK:STDOUT:   call void @_Z13TakeConstCRefRK1C.carbon_thunk(ptr %c.var), !dbg !22
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %n.var), !dbg !17
+// CHECK:STDOUT:   call void @_Z10TakeIntRefRi(ptr %n.var), !dbg !23
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc24_22.3.temp), !dbg !18
+// CHECK:STDOUT:   store i32 42, ptr %.loc24_22.3.temp, align 4, !dbg !18
+// CHECK:STDOUT:   call void @_Z11TakeIntRRefOi.carbon_thunk(ptr %.loc24_22.3.temp), !dbg !24
+// CHECK:STDOUT:   %.loc25_23.1 = load i32, ptr %n.var, align 4, !dbg !19
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc25_23.2.temp), !dbg !19
+// CHECK:STDOUT:   store i32 %.loc25_23.1, ptr %.loc25_23.2.temp, align 4, !dbg !19
+// CHECK:STDOUT:   call void @_Z15TakeConstIntRefRKi.carbon_thunk(ptr %.loc25_23.2.temp), !dbg !25
+// CHECK:STDOUT:   ret void, !dbg !26
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: declare void @_Z8TakeCRefR1C(ptr)
@@ -171,53 +171,53 @@ fn GetRefs() {
 // CHECK:STDOUT: ; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
 // CHECK:STDOUT: declare void @llvm.memcpy.p0.p0.i64(ptr noalias writeonly captures(none), ptr noalias readonly captures(none), i64, i1 immarg) #2
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local void @_Z9TakeCRRefO1C.carbon_thunk(ptr %0) #3 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local void @_Z9TakeCRRefO1C.carbon_thunk(ptr noundef %0) #3 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %.addr = alloca ptr, align 8
-// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8
-// CHECK:STDOUT:   %1 = load ptr, ptr %.addr, align 8
-// CHECK:STDOUT:   call void @_Z9TakeCRRefO1C(ptr nonnull align 1 dereferenceable(1) %1)
+// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8, !tbaa !27
+// CHECK:STDOUT:   %1 = load ptr, ptr %.addr, align 8, !tbaa !27
+// CHECK:STDOUT:   call void @_Z9TakeCRRefO1C(ptr noundef nonnull align 1 dereferenceable(1) %1)
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare void @_Z9TakeCRRefO1C(ptr nonnull align 1 dereferenceable(1)) #4
+// CHECK:STDOUT: declare void @_Z9TakeCRRefO1C(ptr noundef nonnull align 1 dereferenceable(1)) #4
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local void @_Z13TakeConstCRefRK1C.carbon_thunk(ptr %0) #3 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local void @_Z13TakeConstCRefRK1C.carbon_thunk(ptr noundef %0) #3 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %.addr = alloca ptr, align 8
-// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8
-// CHECK:STDOUT:   %1 = load ptr, ptr %.addr, align 8
-// CHECK:STDOUT:   call void @_Z13TakeConstCRefRK1C(ptr nonnull align 1 dereferenceable(1) %1)
+// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8, !tbaa !27
+// CHECK:STDOUT:   %1 = load ptr, ptr %.addr, align 8, !tbaa !27
+// CHECK:STDOUT:   call void @_Z13TakeConstCRefRK1C(ptr noundef nonnull align 1 dereferenceable(1) %1)
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare void @_Z13TakeConstCRefRK1C(ptr nonnull align 1 dereferenceable(1)) #4
+// CHECK:STDOUT: declare void @_Z13TakeConstCRefRK1C(ptr noundef nonnull align 1 dereferenceable(1)) #4
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local void @_Z11TakeIntRRefOi.carbon_thunk(ptr %0) #3 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local void @_Z11TakeIntRRefOi.carbon_thunk(ptr noundef %0) #3 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %.addr = alloca ptr, align 8
-// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8
-// CHECK:STDOUT:   %1 = load ptr, ptr %.addr, align 8
-// CHECK:STDOUT:   call void @_Z11TakeIntRRefOi(ptr nonnull align 4 dereferenceable(4) %1)
+// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8, !tbaa !30
+// CHECK:STDOUT:   %1 = load ptr, ptr %.addr, align 8, !tbaa !30
+// CHECK:STDOUT:   call void @_Z11TakeIntRRefOi(ptr noundef nonnull align 4 dereferenceable(4) %1)
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare void @_Z11TakeIntRRefOi(ptr nonnull align 4 dereferenceable(4)) #4
+// CHECK:STDOUT: declare void @_Z11TakeIntRRefOi(ptr noundef nonnull align 4 dereferenceable(4)) #4
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local void @_Z15TakeConstIntRefRKi.carbon_thunk(ptr %0) #3 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local void @_Z15TakeConstIntRefRKi.carbon_thunk(ptr noundef %0) #3 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %.addr = alloca ptr, align 8
-// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8
-// CHECK:STDOUT:   %1 = load ptr, ptr %.addr, align 8
-// CHECK:STDOUT:   call void @_Z15TakeConstIntRefRKi(ptr nonnull align 4 dereferenceable(4) %1)
+// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8, !tbaa !30
+// CHECK:STDOUT:   %1 = load ptr, ptr %.addr, align 8, !tbaa !30
+// CHECK:STDOUT:   call void @_Z15TakeConstIntRefRKi(ptr noundef nonnull align 4 dereferenceable(4) %1)
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare void @_Z15TakeConstIntRefRKi(ptr nonnull align 4 dereferenceable(4)) #4
+// CHECK:STDOUT: declare void @_Z15TakeConstIntRefRKi(ptr noundef nonnull align 4 dereferenceable(4)) #4
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; uselistorder directives
 // CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 4, 3, 2, 1, 0 }
@@ -225,34 +225,45 @@ fn GetRefs() {
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
 // CHECK:STDOUT: attributes #2 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
-// CHECK:STDOUT: attributes #3 = { alwaysinline mustprogress "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
-// CHECK:STDOUT: attributes #4 = { "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #3 = { alwaysinline mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #4 = { "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "pass_references.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "PassRefs", linkageName: "_CPassRefs.Main", scope: null, file: !6, line: 16, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{null}
-// CHECK:STDOUT: !10 = !DILocation(line: 17, column: 3, scope: !7)
-// CHECK:STDOUT: !11 = !DILocation(line: 19, column: 17, scope: !7)
-// CHECK:STDOUT: !12 = !DILocation(line: 22, column: 3, scope: !7)
-// CHECK:STDOUT: !13 = !DILocation(line: 24, column: 19, scope: !7)
-// CHECK:STDOUT: !14 = !DILocation(line: 25, column: 23, scope: !7)
-// CHECK:STDOUT: !15 = !DILocation(line: 18, column: 3, scope: !7)
-// CHECK:STDOUT: !16 = !DILocation(line: 19, column: 3, scope: !7)
-// CHECK:STDOUT: !17 = !DILocation(line: 20, column: 3, scope: !7)
-// CHECK:STDOUT: !18 = !DILocation(line: 23, column: 3, scope: !7)
-// CHECK:STDOUT: !19 = !DILocation(line: 24, column: 3, scope: !7)
-// CHECK:STDOUT: !20 = !DILocation(line: 25, column: 3, scope: !7)
-// CHECK:STDOUT: !21 = !DILocation(line: 16, column: 1, scope: !7)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "pass_references.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "PassRefs", linkageName: "_CPassRefs.Main", scope: null, file: !7, line: 16, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{null}
+// CHECK:STDOUT: !15 = !DILocation(line: 17, column: 3, scope: !12)
+// CHECK:STDOUT: !16 = !DILocation(line: 19, column: 17, scope: !12)
+// CHECK:STDOUT: !17 = !DILocation(line: 22, column: 3, scope: !12)
+// CHECK:STDOUT: !18 = !DILocation(line: 24, column: 19, scope: !12)
+// CHECK:STDOUT: !19 = !DILocation(line: 25, column: 23, scope: !12)
+// CHECK:STDOUT: !20 = !DILocation(line: 18, column: 3, scope: !12)
+// CHECK:STDOUT: !21 = !DILocation(line: 19, column: 3, scope: !12)
+// CHECK:STDOUT: !22 = !DILocation(line: 20, column: 3, scope: !12)
+// CHECK:STDOUT: !23 = !DILocation(line: 23, column: 3, scope: !12)
+// CHECK:STDOUT: !24 = !DILocation(line: 24, column: 3, scope: !12)
+// CHECK:STDOUT: !25 = !DILocation(line: 25, column: 3, scope: !12)
+// CHECK:STDOUT: !26 = !DILocation(line: 16, column: 1, scope: !12)
+// CHECK:STDOUT: !27 = !{!28, !28, i64 0}
+// CHECK:STDOUT: !28 = !{!"p1 _ZTS1C", !29, i64 0}
+// CHECK:STDOUT: !29 = !{!"any pointer", !10, i64 0}
+// CHECK:STDOUT: !30 = !{!31, !31, i64 0}
+// CHECK:STDOUT: !31 = !{!"p1 int", !29, i64 0}
 // CHECK:STDOUT: ; ModuleID = 'pass_references_via_thunk.carbon'
 // CHECK:STDOUT: source_filename = "pass_references_via_thunk.carbon"
 // CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
@@ -263,29 +274,29 @@ fn GetRefs() {
 // CHECK:STDOUT: @C.val.loc20_18.3 = internal constant {} zeroinitializer
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CPassRefs.Main() #0 !dbg !7 {
+// CHECK:STDOUT: define void @_CPassRefs.Main() #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %c.var = alloca {}, align 8, !dbg !10
-// CHECK:STDOUT:   %.loc20_18.2.temp = alloca {}, align 8, !dbg !11
-// CHECK:STDOUT:   %n.var = alloca i32, align 4, !dbg !12
-// CHECK:STDOUT:   %.loc25_22.3.temp = alloca i32, align 4, !dbg !13
-// CHECK:STDOUT:   %.loc26_23.2.temp = alloca i32, align 4, !dbg !14
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %c.var), !dbg !10
-// CHECK:STDOUT:   call void @_Z8TakeCRefR1C10ForceThunk.carbon_thunk1(ptr %c.var), !dbg !15
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc20_18.2.temp), !dbg !11
-// CHECK:STDOUT:   call void @llvm.memcpy.p0.p0.i64(ptr align 1 %.loc20_18.2.temp, ptr align 1 @C.val.loc20_18.3, i64 0, i1 false), !dbg !11
-// CHECK:STDOUT:   call void @_Z9TakeCRRefRK1C10ForceThunk.carbon_thunk1(ptr %.loc20_18.2.temp), !dbg !16
-// CHECK:STDOUT:   call void @_Z13TakeConstCRefRK1C10ForceThunk.carbon_thunk1(ptr %c.var), !dbg !17
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %n.var), !dbg !12
-// CHECK:STDOUT:   call void @_Z10TakeIntRefRi10ForceThunk.carbon_thunk1(ptr %n.var), !dbg !18
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc25_22.3.temp), !dbg !13
-// CHECK:STDOUT:   store i32 42, ptr %.loc25_22.3.temp, align 4, !dbg !13
-// CHECK:STDOUT:   call void @_Z11TakeIntRRefOi10ForceThunk.carbon_thunk1(ptr %.loc25_22.3.temp), !dbg !19
-// CHECK:STDOUT:   %.loc26_23.1 = load i32, ptr %n.var, align 4, !dbg !14
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc26_23.2.temp), !dbg !14
-// CHECK:STDOUT:   store i32 %.loc26_23.1, ptr %.loc26_23.2.temp, align 4, !dbg !14
-// CHECK:STDOUT:   call void @_Z15TakeConstIntRefRKi10ForceThunk.carbon_thunk1(ptr %.loc26_23.2.temp), !dbg !20
-// CHECK:STDOUT:   ret void, !dbg !21
+// CHECK:STDOUT:   %c.var = alloca {}, align 8, !dbg !15
+// CHECK:STDOUT:   %.loc20_18.2.temp = alloca {}, align 8, !dbg !16
+// CHECK:STDOUT:   %n.var = alloca i32, align 4, !dbg !17
+// CHECK:STDOUT:   %.loc25_22.3.temp = alloca i32, align 4, !dbg !18
+// CHECK:STDOUT:   %.loc26_23.2.temp = alloca i32, align 4, !dbg !19
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %c.var), !dbg !15
+// CHECK:STDOUT:   call void @_Z8TakeCRefR1C10ForceThunk.carbon_thunk1(ptr %c.var), !dbg !20
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc20_18.2.temp), !dbg !16
+// CHECK:STDOUT:   call void @llvm.memcpy.p0.p0.i64(ptr align 1 %.loc20_18.2.temp, ptr align 1 @C.val.loc20_18.3, i64 0, i1 false), !dbg !16
+// CHECK:STDOUT:   call void @_Z9TakeCRRefRK1C10ForceThunk.carbon_thunk1(ptr %.loc20_18.2.temp), !dbg !21
+// CHECK:STDOUT:   call void @_Z13TakeConstCRefRK1C10ForceThunk.carbon_thunk1(ptr %c.var), !dbg !22
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %n.var), !dbg !17
+// CHECK:STDOUT:   call void @_Z10TakeIntRefRi10ForceThunk.carbon_thunk1(ptr %n.var), !dbg !23
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc25_22.3.temp), !dbg !18
+// CHECK:STDOUT:   store i32 42, ptr %.loc25_22.3.temp, align 4, !dbg !18
+// CHECK:STDOUT:   call void @_Z11TakeIntRRefOi10ForceThunk.carbon_thunk1(ptr %.loc25_22.3.temp), !dbg !24
+// CHECK:STDOUT:   %.loc26_23.1 = load i32, ptr %n.var, align 4, !dbg !19
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc26_23.2.temp), !dbg !19
+// CHECK:STDOUT:   store i32 %.loc26_23.1, ptr %.loc26_23.2.temp, align 4, !dbg !19
+// CHECK:STDOUT:   call void @_Z15TakeConstIntRefRKi10ForceThunk.carbon_thunk1(ptr %.loc26_23.2.temp), !dbg !25
+// CHECK:STDOUT:   ret void, !dbg !26
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
@@ -294,83 +305,83 @@ fn GetRefs() {
 // CHECK:STDOUT: ; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
 // CHECK:STDOUT: declare void @llvm.memcpy.p0.p0.i64(ptr noalias writeonly captures(none), ptr noalias readonly captures(none), i64, i1 immarg) #2
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local void @_Z8TakeCRefR1C10ForceThunk.carbon_thunk1(ptr nonnull align 1 dereferenceable(1) %0) #3 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local void @_Z8TakeCRefR1C10ForceThunk.carbon_thunk1(ptr noundef nonnull align 1 dereferenceable(1) %0) #3 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %.addr = alloca ptr, align 8
 // CHECK:STDOUT:   %agg.tmp = alloca %class.ForceThunk, align 1
-// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8
-// CHECK:STDOUT:   %1 = load ptr, ptr %.addr, align 8, !nonnull !22
-// CHECK:STDOUT:   call void @_Z8TakeCRefR1C10ForceThunk(ptr nonnull align 1 dereferenceable(1) %1)
+// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8, !tbaa !27
+// CHECK:STDOUT:   %1 = load ptr, ptr %.addr, align 8, !tbaa !27, !nonnull !30
+// CHECK:STDOUT:   call void @_Z8TakeCRefR1C10ForceThunk(ptr noundef nonnull align 1 dereferenceable(1) %1)
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare void @_Z8TakeCRefR1C10ForceThunk(ptr nonnull align 1 dereferenceable(1)) #4
+// CHECK:STDOUT: declare void @_Z8TakeCRefR1C10ForceThunk(ptr noundef nonnull align 1 dereferenceable(1)) #4
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local void @_Z9TakeCRRefRK1C10ForceThunk.carbon_thunk1(ptr %0) #3 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local void @_Z9TakeCRRefRK1C10ForceThunk.carbon_thunk1(ptr noundef %0) #3 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %.addr = alloca ptr, align 8
 // CHECK:STDOUT:   %agg.tmp = alloca %class.ForceThunk, align 1
-// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8
-// CHECK:STDOUT:   %1 = load ptr, ptr %.addr, align 8
-// CHECK:STDOUT:   call void @_Z9TakeCRRefRK1C10ForceThunk(ptr nonnull align 1 dereferenceable(1) %1)
+// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8, !tbaa !27
+// CHECK:STDOUT:   %1 = load ptr, ptr %.addr, align 8, !tbaa !27
+// CHECK:STDOUT:   call void @_Z9TakeCRRefRK1C10ForceThunk(ptr noundef nonnull align 1 dereferenceable(1) %1)
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare void @_Z9TakeCRRefRK1C10ForceThunk(ptr nonnull align 1 dereferenceable(1)) #4
+// CHECK:STDOUT: declare void @_Z9TakeCRRefRK1C10ForceThunk(ptr noundef nonnull align 1 dereferenceable(1)) #4
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local void @_Z13TakeConstCRefRK1C10ForceThunk.carbon_thunk1(ptr %0) #3 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local void @_Z13TakeConstCRefRK1C10ForceThunk.carbon_thunk1(ptr noundef %0) #3 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %.addr = alloca ptr, align 8
 // CHECK:STDOUT:   %agg.tmp = alloca %class.ForceThunk, align 1
-// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8
-// CHECK:STDOUT:   %1 = load ptr, ptr %.addr, align 8
-// CHECK:STDOUT:   call void @_Z13TakeConstCRefRK1C10ForceThunk(ptr nonnull align 1 dereferenceable(1) %1)
+// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8, !tbaa !27
+// CHECK:STDOUT:   %1 = load ptr, ptr %.addr, align 8, !tbaa !27
+// CHECK:STDOUT:   call void @_Z13TakeConstCRefRK1C10ForceThunk(ptr noundef nonnull align 1 dereferenceable(1) %1)
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare void @_Z13TakeConstCRefRK1C10ForceThunk(ptr nonnull align 1 dereferenceable(1)) #4
+// CHECK:STDOUT: declare void @_Z13TakeConstCRefRK1C10ForceThunk(ptr noundef nonnull align 1 dereferenceable(1)) #4
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local void @_Z10TakeIntRefRi10ForceThunk.carbon_thunk1(ptr nonnull align 4 dereferenceable(4) %0) #3 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local void @_Z10TakeIntRefRi10ForceThunk.carbon_thunk1(ptr noundef nonnull align 4 dereferenceable(4) %0) #3 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %.addr = alloca ptr, align 8
 // CHECK:STDOUT:   %agg.tmp = alloca %class.ForceThunk, align 1
-// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8
-// CHECK:STDOUT:   %1 = load ptr, ptr %.addr, align 8, !nonnull !22, !align !23
-// CHECK:STDOUT:   call void @_Z10TakeIntRefRi10ForceThunk(ptr nonnull align 4 dereferenceable(4) %1)
+// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8, !tbaa !31
+// CHECK:STDOUT:   %1 = load ptr, ptr %.addr, align 8, !tbaa !31, !nonnull !30, !align !33
+// CHECK:STDOUT:   call void @_Z10TakeIntRefRi10ForceThunk(ptr noundef nonnull align 4 dereferenceable(4) %1)
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare void @_Z10TakeIntRefRi10ForceThunk(ptr nonnull align 4 dereferenceable(4)) #4
+// CHECK:STDOUT: declare void @_Z10TakeIntRefRi10ForceThunk(ptr noundef nonnull align 4 dereferenceable(4)) #4
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local void @_Z11TakeIntRRefOi10ForceThunk.carbon_thunk1(ptr %0) #3 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local void @_Z11TakeIntRRefOi10ForceThunk.carbon_thunk1(ptr noundef %0) #3 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %.addr = alloca ptr, align 8
 // CHECK:STDOUT:   %agg.tmp = alloca %class.ForceThunk, align 1
-// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8
-// CHECK:STDOUT:   %1 = load ptr, ptr %.addr, align 8
-// CHECK:STDOUT:   call void @_Z11TakeIntRRefOi10ForceThunk(ptr nonnull align 4 dereferenceable(4) %1)
+// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8, !tbaa !31
+// CHECK:STDOUT:   %1 = load ptr, ptr %.addr, align 8, !tbaa !31
+// CHECK:STDOUT:   call void @_Z11TakeIntRRefOi10ForceThunk(ptr noundef nonnull align 4 dereferenceable(4) %1)
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare void @_Z11TakeIntRRefOi10ForceThunk(ptr nonnull align 4 dereferenceable(4)) #4
+// CHECK:STDOUT: declare void @_Z11TakeIntRRefOi10ForceThunk(ptr noundef nonnull align 4 dereferenceable(4)) #4
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local void @_Z15TakeConstIntRefRKi10ForceThunk.carbon_thunk1(ptr %0) #3 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local void @_Z15TakeConstIntRefRKi10ForceThunk.carbon_thunk1(ptr noundef %0) #3 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %.addr = alloca ptr, align 8
 // CHECK:STDOUT:   %agg.tmp = alloca %class.ForceThunk, align 1
-// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8
-// CHECK:STDOUT:   %1 = load ptr, ptr %.addr, align 8
-// CHECK:STDOUT:   call void @_Z15TakeConstIntRefRKi10ForceThunk(ptr nonnull align 4 dereferenceable(4) %1)
+// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8, !tbaa !31
+// CHECK:STDOUT:   %1 = load ptr, ptr %.addr, align 8, !tbaa !31
+// CHECK:STDOUT:   call void @_Z15TakeConstIntRefRKi10ForceThunk(ptr noundef nonnull align 4 dereferenceable(4) %1)
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare void @_Z15TakeConstIntRefRKi10ForceThunk(ptr nonnull align 4 dereferenceable(4)) #4
+// CHECK:STDOUT: declare void @_Z15TakeConstIntRefRKi10ForceThunk(ptr noundef nonnull align 4 dereferenceable(4)) #4
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; uselistorder directives
 // CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 4, 3, 2, 1, 0 }
@@ -378,69 +389,80 @@ fn GetRefs() {
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
 // CHECK:STDOUT: attributes #2 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
-// CHECK:STDOUT: attributes #3 = { alwaysinline mustprogress "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
-// CHECK:STDOUT: attributes #4 = { "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #3 = { alwaysinline mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #4 = { "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "pass_references_via_thunk.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "PassRefs", linkageName: "_CPassRefs.Main", scope: null, file: !6, line: 17, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{null}
-// CHECK:STDOUT: !10 = !DILocation(line: 18, column: 3, scope: !7)
-// CHECK:STDOUT: !11 = !DILocation(line: 20, column: 17, scope: !7)
-// CHECK:STDOUT: !12 = !DILocation(line: 23, column: 3, scope: !7)
-// CHECK:STDOUT: !13 = !DILocation(line: 25, column: 19, scope: !7)
-// CHECK:STDOUT: !14 = !DILocation(line: 26, column: 23, scope: !7)
-// CHECK:STDOUT: !15 = !DILocation(line: 19, column: 3, scope: !7)
-// CHECK:STDOUT: !16 = !DILocation(line: 20, column: 3, scope: !7)
-// CHECK:STDOUT: !17 = !DILocation(line: 21, column: 3, scope: !7)
-// CHECK:STDOUT: !18 = !DILocation(line: 24, column: 3, scope: !7)
-// CHECK:STDOUT: !19 = !DILocation(line: 25, column: 3, scope: !7)
-// CHECK:STDOUT: !20 = !DILocation(line: 26, column: 3, scope: !7)
-// CHECK:STDOUT: !21 = !DILocation(line: 17, column: 1, scope: !7)
-// CHECK:STDOUT: !22 = !{}
-// CHECK:STDOUT: !23 = !{i64 4}
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "pass_references_via_thunk.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "PassRefs", linkageName: "_CPassRefs.Main", scope: null, file: !7, line: 17, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{null}
+// CHECK:STDOUT: !15 = !DILocation(line: 18, column: 3, scope: !12)
+// CHECK:STDOUT: !16 = !DILocation(line: 20, column: 17, scope: !12)
+// CHECK:STDOUT: !17 = !DILocation(line: 23, column: 3, scope: !12)
+// CHECK:STDOUT: !18 = !DILocation(line: 25, column: 19, scope: !12)
+// CHECK:STDOUT: !19 = !DILocation(line: 26, column: 23, scope: !12)
+// CHECK:STDOUT: !20 = !DILocation(line: 19, column: 3, scope: !12)
+// CHECK:STDOUT: !21 = !DILocation(line: 20, column: 3, scope: !12)
+// CHECK:STDOUT: !22 = !DILocation(line: 21, column: 3, scope: !12)
+// CHECK:STDOUT: !23 = !DILocation(line: 24, column: 3, scope: !12)
+// CHECK:STDOUT: !24 = !DILocation(line: 25, column: 3, scope: !12)
+// CHECK:STDOUT: !25 = !DILocation(line: 26, column: 3, scope: !12)
+// CHECK:STDOUT: !26 = !DILocation(line: 17, column: 1, scope: !12)
+// CHECK:STDOUT: !27 = !{!28, !28, i64 0}
+// CHECK:STDOUT: !28 = !{!"p1 _ZTS1C", !29, i64 0}
+// CHECK:STDOUT: !29 = !{!"any pointer", !10, i64 0}
+// CHECK:STDOUT: !30 = !{}
+// CHECK:STDOUT: !31 = !{!32, !32, i64 0}
+// CHECK:STDOUT: !32 = !{!"p1 int", !29, i64 0}
+// CHECK:STDOUT: !33 = !{i64 4}
 // CHECK:STDOUT: ; ModuleID = 'return_references.carbon'
 // CHECK:STDOUT: source_filename = "return_references.carbon"
 // CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
 // CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CGetRefs.Main() #0 !dbg !7 {
+// CHECK:STDOUT: define void @_CGetRefs.Main() #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %_.var.loc17 = alloca ptr, align 8, !dbg !10
-// CHECK:STDOUT:   %_.var.loc18 = alloca ptr, align 8, !dbg !11
-// CHECK:STDOUT:   %_.var.loc19 = alloca ptr, align 8, !dbg !12
-// CHECK:STDOUT:   %_.var.loc21 = alloca ptr, align 8, !dbg !13
-// CHECK:STDOUT:   %_.var.loc22 = alloca ptr, align 8, !dbg !14
-// CHECK:STDOUT:   %_.var.loc23 = alloca ptr, align 8, !dbg !15
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %_.var.loc17), !dbg !10
-// CHECK:STDOUT:   %ReturnCRef.call = call ptr @_Z10ReturnCRefv(), !dbg !16
-// CHECK:STDOUT:   store ptr %ReturnCRef.call, ptr %_.var.loc17, align 8, !dbg !10
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %_.var.loc18), !dbg !11
-// CHECK:STDOUT:   %ReturnCRRef.call = call ptr @_Z11ReturnCRRefv(), !dbg !17
-// CHECK:STDOUT:   store ptr %ReturnCRRef.call, ptr %_.var.loc18, align 8, !dbg !11
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %_.var.loc19), !dbg !12
-// CHECK:STDOUT:   %ReturnConstCRef.call = call ptr @_Z15ReturnConstCRefv(), !dbg !18
-// CHECK:STDOUT:   store ptr %ReturnConstCRef.call, ptr %_.var.loc19, align 8, !dbg !12
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %_.var.loc21), !dbg !13
-// CHECK:STDOUT:   %ReturnIntRef.call = call ptr @_Z12ReturnIntRefv(), !dbg !19
-// CHECK:STDOUT:   store ptr %ReturnIntRef.call, ptr %_.var.loc21, align 8, !dbg !13
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %_.var.loc22), !dbg !14
-// CHECK:STDOUT:   %ReturnIntRRef.call = call ptr @_Z13ReturnIntRRefv(), !dbg !20
-// CHECK:STDOUT:   store ptr %ReturnIntRRef.call, ptr %_.var.loc22, align 8, !dbg !14
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %_.var.loc23), !dbg !15
-// CHECK:STDOUT:   %ReturnConstIntRef.call = call ptr @_Z17ReturnConstIntRefv(), !dbg !21
-// CHECK:STDOUT:   store ptr %ReturnConstIntRef.call, ptr %_.var.loc23, align 8, !dbg !15
-// CHECK:STDOUT:   ret void, !dbg !22
+// CHECK:STDOUT:   %_.var.loc17 = alloca ptr, align 8, !dbg !15
+// CHECK:STDOUT:   %_.var.loc18 = alloca ptr, align 8, !dbg !16
+// CHECK:STDOUT:   %_.var.loc19 = alloca ptr, align 8, !dbg !17
+// CHECK:STDOUT:   %_.var.loc21 = alloca ptr, align 8, !dbg !18
+// CHECK:STDOUT:   %_.var.loc22 = alloca ptr, align 8, !dbg !19
+// CHECK:STDOUT:   %_.var.loc23 = alloca ptr, align 8, !dbg !20
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %_.var.loc17), !dbg !15
+// CHECK:STDOUT:   %ReturnCRef.call = call ptr @_Z10ReturnCRefv(), !dbg !21
+// CHECK:STDOUT:   store ptr %ReturnCRef.call, ptr %_.var.loc17, align 8, !dbg !15
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %_.var.loc18), !dbg !16
+// CHECK:STDOUT:   %ReturnCRRef.call = call ptr @_Z11ReturnCRRefv(), !dbg !22
+// CHECK:STDOUT:   store ptr %ReturnCRRef.call, ptr %_.var.loc18, align 8, !dbg !16
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %_.var.loc19), !dbg !17
+// CHECK:STDOUT:   %ReturnConstCRef.call = call ptr @_Z15ReturnConstCRefv(), !dbg !23
+// CHECK:STDOUT:   store ptr %ReturnConstCRef.call, ptr %_.var.loc19, align 8, !dbg !17
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %_.var.loc21), !dbg !18
+// CHECK:STDOUT:   %ReturnIntRef.call = call ptr @_Z12ReturnIntRefv(), !dbg !24
+// CHECK:STDOUT:   store ptr %ReturnIntRef.call, ptr %_.var.loc21, align 8, !dbg !18
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %_.var.loc22), !dbg !19
+// CHECK:STDOUT:   %ReturnIntRRef.call = call ptr @_Z13ReturnIntRRefv(), !dbg !25
+// CHECK:STDOUT:   store ptr %ReturnIntRRef.call, ptr %_.var.loc22, align 8, !dbg !19
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %_.var.loc23), !dbg !20
+// CHECK:STDOUT:   %ReturnConstIntRef.call = call ptr @_Z17ReturnConstIntRefv(), !dbg !26
+// CHECK:STDOUT:   store ptr %ReturnConstIntRef.call, ptr %_.var.loc23, align 8, !dbg !20
+// CHECK:STDOUT:   ret void, !dbg !27
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: declare ptr @_Z10ReturnCRefv()
@@ -464,32 +486,38 @@ fn GetRefs() {
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "return_references.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "GetRefs", linkageName: "_CGetRefs.Main", scope: null, file: !6, line: 16, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{null}
-// CHECK:STDOUT: !10 = !DILocation(line: 17, column: 3, scope: !7)
-// CHECK:STDOUT: !11 = !DILocation(line: 18, column: 3, scope: !7)
-// CHECK:STDOUT: !12 = !DILocation(line: 19, column: 3, scope: !7)
-// CHECK:STDOUT: !13 = !DILocation(line: 21, column: 3, scope: !7)
-// CHECK:STDOUT: !14 = !DILocation(line: 22, column: 3, scope: !7)
-// CHECK:STDOUT: !15 = !DILocation(line: 23, column: 3, scope: !7)
-// CHECK:STDOUT: !16 = !DILocation(line: 17, column: 19, scope: !7)
-// CHECK:STDOUT: !17 = !DILocation(line: 18, column: 19, scope: !7)
-// CHECK:STDOUT: !18 = !DILocation(line: 19, column: 25, scope: !7)
-// CHECK:STDOUT: !19 = !DILocation(line: 21, column: 17, scope: !7)
-// CHECK:STDOUT: !20 = !DILocation(line: 22, column: 17, scope: !7)
-// CHECK:STDOUT: !21 = !DILocation(line: 23, column: 23, scope: !7)
-// CHECK:STDOUT: !22 = !DILocation(line: 16, column: 1, scope: !7)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "return_references.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "GetRefs", linkageName: "_CGetRefs.Main", scope: null, file: !7, line: 16, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{null}
+// CHECK:STDOUT: !15 = !DILocation(line: 17, column: 3, scope: !12)
+// CHECK:STDOUT: !16 = !DILocation(line: 18, column: 3, scope: !12)
+// CHECK:STDOUT: !17 = !DILocation(line: 19, column: 3, scope: !12)
+// CHECK:STDOUT: !18 = !DILocation(line: 21, column: 3, scope: !12)
+// CHECK:STDOUT: !19 = !DILocation(line: 22, column: 3, scope: !12)
+// CHECK:STDOUT: !20 = !DILocation(line: 23, column: 3, scope: !12)
+// CHECK:STDOUT: !21 = !DILocation(line: 17, column: 19, scope: !12)
+// CHECK:STDOUT: !22 = !DILocation(line: 18, column: 19, scope: !12)
+// CHECK:STDOUT: !23 = !DILocation(line: 19, column: 25, scope: !12)
+// CHECK:STDOUT: !24 = !DILocation(line: 21, column: 17, scope: !12)
+// CHECK:STDOUT: !25 = !DILocation(line: 22, column: 17, scope: !12)
+// CHECK:STDOUT: !26 = !DILocation(line: 23, column: 23, scope: !12)
+// CHECK:STDOUT: !27 = !DILocation(line: 16, column: 1, scope: !12)
 // CHECK:STDOUT: ; ModuleID = 'return_references_via_thunk.carbon'
 // CHECK:STDOUT: source_filename = "return_references_via_thunk.carbon"
 // CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
@@ -498,129 +526,135 @@ fn GetRefs() {
 // CHECK:STDOUT: %class.ForceThunk = type { i8 }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CGetRefs.Main() #0 !dbg !7 {
+// CHECK:STDOUT: define void @_CGetRefs.Main() #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %_.var.loc18 = alloca ptr, align 8, !dbg !10
-// CHECK:STDOUT:   %_.var.loc19 = alloca ptr, align 8, !dbg !11
-// CHECK:STDOUT:   %_.var.loc20 = alloca ptr, align 8, !dbg !12
-// CHECK:STDOUT:   %_.var.loc22 = alloca ptr, align 8, !dbg !13
-// CHECK:STDOUT:   %_.var.loc23 = alloca ptr, align 8, !dbg !14
-// CHECK:STDOUT:   %_.var.loc24 = alloca ptr, align 8, !dbg !15
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %_.var.loc18), !dbg !10
-// CHECK:STDOUT:   %ReturnCRef__carbon_thunk.call = call ptr @_Z10ReturnCRef10ForceThunk.carbon_thunk0(), !dbg !16
-// CHECK:STDOUT:   store ptr %ReturnCRef__carbon_thunk.call, ptr %_.var.loc18, align 8, !dbg !10
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %_.var.loc19), !dbg !11
-// CHECK:STDOUT:   %ReturnCRRef__carbon_thunk.call = call ptr @_Z11ReturnCRRef10ForceThunk.carbon_thunk0(), !dbg !17
-// CHECK:STDOUT:   store ptr %ReturnCRRef__carbon_thunk.call, ptr %_.var.loc19, align 8, !dbg !11
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %_.var.loc20), !dbg !12
-// CHECK:STDOUT:   %ReturnConstCRef__carbon_thunk.call = call ptr @_Z15ReturnConstCRef10ForceThunk.carbon_thunk0(), !dbg !18
-// CHECK:STDOUT:   store ptr %ReturnConstCRef__carbon_thunk.call, ptr %_.var.loc20, align 8, !dbg !12
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %_.var.loc22), !dbg !13
-// CHECK:STDOUT:   %ReturnIntRef__carbon_thunk.call = call ptr @_Z12ReturnIntRef10ForceThunk.carbon_thunk0(), !dbg !19
-// CHECK:STDOUT:   store ptr %ReturnIntRef__carbon_thunk.call, ptr %_.var.loc22, align 8, !dbg !13
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %_.var.loc23), !dbg !14
-// CHECK:STDOUT:   %ReturnIntRRef__carbon_thunk.call = call ptr @_Z13ReturnIntRRef10ForceThunk.carbon_thunk0(), !dbg !20
-// CHECK:STDOUT:   store ptr %ReturnIntRRef__carbon_thunk.call, ptr %_.var.loc23, align 8, !dbg !14
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %_.var.loc24), !dbg !15
-// CHECK:STDOUT:   %ReturnConstIntRef__carbon_thunk.call = call ptr @_Z17ReturnConstIntRef10ForceThunk.carbon_thunk0(), !dbg !21
-// CHECK:STDOUT:   store ptr %ReturnConstIntRef__carbon_thunk.call, ptr %_.var.loc24, align 8, !dbg !15
-// CHECK:STDOUT:   ret void, !dbg !22
+// CHECK:STDOUT:   %_.var.loc18 = alloca ptr, align 8, !dbg !15
+// CHECK:STDOUT:   %_.var.loc19 = alloca ptr, align 8, !dbg !16
+// CHECK:STDOUT:   %_.var.loc20 = alloca ptr, align 8, !dbg !17
+// CHECK:STDOUT:   %_.var.loc22 = alloca ptr, align 8, !dbg !18
+// CHECK:STDOUT:   %_.var.loc23 = alloca ptr, align 8, !dbg !19
+// CHECK:STDOUT:   %_.var.loc24 = alloca ptr, align 8, !dbg !20
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %_.var.loc18), !dbg !15
+// CHECK:STDOUT:   %ReturnCRef__carbon_thunk.call = call ptr @_Z10ReturnCRef10ForceThunk.carbon_thunk0(), !dbg !21
+// CHECK:STDOUT:   store ptr %ReturnCRef__carbon_thunk.call, ptr %_.var.loc18, align 8, !dbg !15
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %_.var.loc19), !dbg !16
+// CHECK:STDOUT:   %ReturnCRRef__carbon_thunk.call = call ptr @_Z11ReturnCRRef10ForceThunk.carbon_thunk0(), !dbg !22
+// CHECK:STDOUT:   store ptr %ReturnCRRef__carbon_thunk.call, ptr %_.var.loc19, align 8, !dbg !16
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %_.var.loc20), !dbg !17
+// CHECK:STDOUT:   %ReturnConstCRef__carbon_thunk.call = call ptr @_Z15ReturnConstCRef10ForceThunk.carbon_thunk0(), !dbg !23
+// CHECK:STDOUT:   store ptr %ReturnConstCRef__carbon_thunk.call, ptr %_.var.loc20, align 8, !dbg !17
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %_.var.loc22), !dbg !18
+// CHECK:STDOUT:   %ReturnIntRef__carbon_thunk.call = call ptr @_Z12ReturnIntRef10ForceThunk.carbon_thunk0(), !dbg !24
+// CHECK:STDOUT:   store ptr %ReturnIntRef__carbon_thunk.call, ptr %_.var.loc22, align 8, !dbg !18
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %_.var.loc23), !dbg !19
+// CHECK:STDOUT:   %ReturnIntRRef__carbon_thunk.call = call ptr @_Z13ReturnIntRRef10ForceThunk.carbon_thunk0(), !dbg !25
+// CHECK:STDOUT:   store ptr %ReturnIntRRef__carbon_thunk.call, ptr %_.var.loc23, align 8, !dbg !19
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %_.var.loc24), !dbg !20
+// CHECK:STDOUT:   %ReturnConstIntRef__carbon_thunk.call = call ptr @_Z17ReturnConstIntRef10ForceThunk.carbon_thunk0(), !dbg !26
+// CHECK:STDOUT:   store ptr %ReturnConstIntRef__carbon_thunk.call, ptr %_.var.loc24, align 8, !dbg !20
+// CHECK:STDOUT:   ret void, !dbg !27
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
 // CHECK:STDOUT: declare void @llvm.lifetime.start.p0(ptr captures(none)) #1
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local nonnull align 1 dereferenceable(1) ptr @_Z10ReturnCRef10ForceThunk.carbon_thunk0() #2 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local noundef nonnull align 1 dereferenceable(1) ptr @_Z10ReturnCRef10ForceThunk.carbon_thunk0() #2 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %agg.tmp = alloca %class.ForceThunk, align 1
-// CHECK:STDOUT:   %call = call nonnull align 1 dereferenceable(1) ptr @_Z10ReturnCRef10ForceThunk()
+// CHECK:STDOUT:   %call = call noundef nonnull align 1 dereferenceable(1) ptr @_Z10ReturnCRef10ForceThunk()
 // CHECK:STDOUT:   ret ptr %call
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare nonnull align 1 dereferenceable(1) ptr @_Z10ReturnCRef10ForceThunk() #3
+// CHECK:STDOUT: declare noundef nonnull align 1 dereferenceable(1) ptr @_Z10ReturnCRef10ForceThunk() #3
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local nonnull align 1 dereferenceable(1) ptr @_Z11ReturnCRRef10ForceThunk.carbon_thunk0() #2 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local noundef nonnull align 1 dereferenceable(1) ptr @_Z11ReturnCRRef10ForceThunk.carbon_thunk0() #2 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %agg.tmp = alloca %class.ForceThunk, align 1
-// CHECK:STDOUT:   %call = call nonnull align 1 dereferenceable(1) ptr @_Z11ReturnCRRef10ForceThunk()
+// CHECK:STDOUT:   %call = call noundef nonnull align 1 dereferenceable(1) ptr @_Z11ReturnCRRef10ForceThunk()
 // CHECK:STDOUT:   ret ptr %call
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare nonnull align 1 dereferenceable(1) ptr @_Z11ReturnCRRef10ForceThunk() #3
+// CHECK:STDOUT: declare noundef nonnull align 1 dereferenceable(1) ptr @_Z11ReturnCRRef10ForceThunk() #3
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local nonnull align 1 dereferenceable(1) ptr @_Z15ReturnConstCRef10ForceThunk.carbon_thunk0() #2 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local noundef nonnull align 1 dereferenceable(1) ptr @_Z15ReturnConstCRef10ForceThunk.carbon_thunk0() #2 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %agg.tmp = alloca %class.ForceThunk, align 1
-// CHECK:STDOUT:   %call = call nonnull align 1 dereferenceable(1) ptr @_Z15ReturnConstCRef10ForceThunk()
+// CHECK:STDOUT:   %call = call noundef nonnull align 1 dereferenceable(1) ptr @_Z15ReturnConstCRef10ForceThunk()
 // CHECK:STDOUT:   ret ptr %call
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare nonnull align 1 dereferenceable(1) ptr @_Z15ReturnConstCRef10ForceThunk() #3
+// CHECK:STDOUT: declare noundef nonnull align 1 dereferenceable(1) ptr @_Z15ReturnConstCRef10ForceThunk() #3
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local nonnull align 4 dereferenceable(4) ptr @_Z12ReturnIntRef10ForceThunk.carbon_thunk0() #2 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local noundef nonnull align 4 dereferenceable(4) ptr @_Z12ReturnIntRef10ForceThunk.carbon_thunk0() #2 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %agg.tmp = alloca %class.ForceThunk, align 1
-// CHECK:STDOUT:   %call = call nonnull align 4 dereferenceable(4) ptr @_Z12ReturnIntRef10ForceThunk()
+// CHECK:STDOUT:   %call = call noundef nonnull align 4 dereferenceable(4) ptr @_Z12ReturnIntRef10ForceThunk()
 // CHECK:STDOUT:   ret ptr %call
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare nonnull align 4 dereferenceable(4) ptr @_Z12ReturnIntRef10ForceThunk() #3
+// CHECK:STDOUT: declare noundef nonnull align 4 dereferenceable(4) ptr @_Z12ReturnIntRef10ForceThunk() #3
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local nonnull align 4 dereferenceable(4) ptr @_Z13ReturnIntRRef10ForceThunk.carbon_thunk0() #2 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local noundef nonnull align 4 dereferenceable(4) ptr @_Z13ReturnIntRRef10ForceThunk.carbon_thunk0() #2 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %agg.tmp = alloca %class.ForceThunk, align 1
-// CHECK:STDOUT:   %call = call nonnull align 4 dereferenceable(4) ptr @_Z13ReturnIntRRef10ForceThunk()
+// CHECK:STDOUT:   %call = call noundef nonnull align 4 dereferenceable(4) ptr @_Z13ReturnIntRRef10ForceThunk()
 // CHECK:STDOUT:   ret ptr %call
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare nonnull align 4 dereferenceable(4) ptr @_Z13ReturnIntRRef10ForceThunk() #3
+// CHECK:STDOUT: declare noundef nonnull align 4 dereferenceable(4) ptr @_Z13ReturnIntRRef10ForceThunk() #3
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local nonnull align 4 dereferenceable(4) ptr @_Z17ReturnConstIntRef10ForceThunk.carbon_thunk0() #2 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local noundef nonnull align 4 dereferenceable(4) ptr @_Z17ReturnConstIntRef10ForceThunk.carbon_thunk0() #2 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %agg.tmp = alloca %class.ForceThunk, align 1
-// CHECK:STDOUT:   %call = call nonnull align 4 dereferenceable(4) ptr @_Z17ReturnConstIntRef10ForceThunk()
+// CHECK:STDOUT:   %call = call noundef nonnull align 4 dereferenceable(4) ptr @_Z17ReturnConstIntRef10ForceThunk()
 // CHECK:STDOUT:   ret ptr %call
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare nonnull align 4 dereferenceable(4) ptr @_Z17ReturnConstIntRef10ForceThunk() #3
+// CHECK:STDOUT: declare noundef nonnull align 4 dereferenceable(4) ptr @_Z17ReturnConstIntRef10ForceThunk() #3
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; uselistorder directives
 // CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 5, 4, 3, 2, 1, 0 }
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
-// CHECK:STDOUT: attributes #2 = { alwaysinline mustprogress "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
-// CHECK:STDOUT: attributes #3 = { "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #2 = { alwaysinline mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #3 = { "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "return_references_via_thunk.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "GetRefs", linkageName: "_CGetRefs.Main", scope: null, file: !6, line: 17, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{null}
-// CHECK:STDOUT: !10 = !DILocation(line: 18, column: 3, scope: !7)
-// CHECK:STDOUT: !11 = !DILocation(line: 19, column: 3, scope: !7)
-// CHECK:STDOUT: !12 = !DILocation(line: 20, column: 3, scope: !7)
-// CHECK:STDOUT: !13 = !DILocation(line: 22, column: 3, scope: !7)
-// CHECK:STDOUT: !14 = !DILocation(line: 23, column: 3, scope: !7)
-// CHECK:STDOUT: !15 = !DILocation(line: 24, column: 3, scope: !7)
-// CHECK:STDOUT: !16 = !DILocation(line: 18, column: 19, scope: !7)
-// CHECK:STDOUT: !17 = !DILocation(line: 19, column: 19, scope: !7)
-// CHECK:STDOUT: !18 = !DILocation(line: 20, column: 25, scope: !7)
-// CHECK:STDOUT: !19 = !DILocation(line: 22, column: 17, scope: !7)
-// CHECK:STDOUT: !20 = !DILocation(line: 23, column: 17, scope: !7)
-// CHECK:STDOUT: !21 = !DILocation(line: 24, column: 23, scope: !7)
-// CHECK:STDOUT: !22 = !DILocation(line: 17, column: 1, scope: !7)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "return_references_via_thunk.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "GetRefs", linkageName: "_CGetRefs.Main", scope: null, file: !7, line: 17, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{null}
+// CHECK:STDOUT: !15 = !DILocation(line: 18, column: 3, scope: !12)
+// CHECK:STDOUT: !16 = !DILocation(line: 19, column: 3, scope: !12)
+// CHECK:STDOUT: !17 = !DILocation(line: 20, column: 3, scope: !12)
+// CHECK:STDOUT: !18 = !DILocation(line: 22, column: 3, scope: !12)
+// CHECK:STDOUT: !19 = !DILocation(line: 23, column: 3, scope: !12)
+// CHECK:STDOUT: !20 = !DILocation(line: 24, column: 3, scope: !12)
+// CHECK:STDOUT: !21 = !DILocation(line: 18, column: 19, scope: !12)
+// CHECK:STDOUT: !22 = !DILocation(line: 19, column: 19, scope: !12)
+// CHECK:STDOUT: !23 = !DILocation(line: 20, column: 25, scope: !12)
+// CHECK:STDOUT: !24 = !DILocation(line: 22, column: 17, scope: !12)
+// CHECK:STDOUT: !25 = !DILocation(line: 23, column: 17, scope: !12)
+// CHECK:STDOUT: !26 = !DILocation(line: 24, column: 23, scope: !12)
+// CHECK:STDOUT: !27 = !DILocation(line: 17, column: 1, scope: !12)

toolchain/lower/testdata/interop/cpp/return.carbon

@@ -118,77 +118,77 @@ fn Call(x: Cpp.D) -> Cpp.C {
 // CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define i8 @_CGetU8.Main() #0 !dbg !7 {
+// CHECK:STDOUT: define i8 @_CGetU8.Main() #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc6_40.1.temp = alloca i8, align 1, !dbg !11
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc6_40.1.temp), !dbg !11
-// CHECK:STDOUT:   call void @_Z8ReturnU8v.carbon_thunk(ptr %.loc6_40.1.temp), !dbg !11
-// CHECK:STDOUT:   %.loc6_40.2 = load i8, ptr %.loc6_40.1.temp, align 1, !dbg !11
-// CHECK:STDOUT:   ret i8 %.loc6_40.2, !dbg !12
+// CHECK:STDOUT:   %.loc6_40.1.temp = alloca i8, align 1, !dbg !16
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc6_40.1.temp), !dbg !16
+// CHECK:STDOUT:   call void @_Z8ReturnU8v.carbon_thunk(ptr %.loc6_40.1.temp), !dbg !16
+// CHECK:STDOUT:   %.loc6_40.2 = load i8, ptr %.loc6_40.1.temp, align 1, !dbg !16
+// CHECK:STDOUT:   ret i8 %.loc6_40.2, !dbg !17
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define i16 @_CGetU16.Main() #0 !dbg !13 {
+// CHECK:STDOUT: define i16 @_CGetU16.Main() #0 !dbg !18 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc7_43.1.temp = alloca i16, align 2, !dbg !17
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc7_43.1.temp), !dbg !17
-// CHECK:STDOUT:   call void @_Z9ReturnU16v.carbon_thunk(ptr %.loc7_43.1.temp), !dbg !17
-// CHECK:STDOUT:   %.loc7_43.2 = load i16, ptr %.loc7_43.1.temp, align 2, !dbg !17
-// CHECK:STDOUT:   ret i16 %.loc7_43.2, !dbg !18
+// CHECK:STDOUT:   %.loc7_43.1.temp = alloca i16, align 2, !dbg !22
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc7_43.1.temp), !dbg !22
+// CHECK:STDOUT:   call void @_Z9ReturnU16v.carbon_thunk(ptr %.loc7_43.1.temp), !dbg !22
+// CHECK:STDOUT:   %.loc7_43.2 = load i16, ptr %.loc7_43.1.temp, align 2, !dbg !22
+// CHECK:STDOUT:   ret i16 %.loc7_43.2, !dbg !23
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define i32 @_CGetU32.Main() #0 !dbg !19 {
+// CHECK:STDOUT: define i32 @_CGetU32.Main() #0 !dbg !24 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %ReturnU32.call = call i32 @_Z9ReturnU32v(), !dbg !23
-// CHECK:STDOUT:   ret i32 %ReturnU32.call, !dbg !24
+// CHECK:STDOUT:   %ReturnU32.call = call i32 @_Z9ReturnU32v(), !dbg !28
+// CHECK:STDOUT:   ret i32 %ReturnU32.call, !dbg !29
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: declare i32 @_Z9ReturnU32v()
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define i64 @_CGetU64.Main() #0 !dbg !25 {
+// CHECK:STDOUT: define i64 @_CGetU64.Main() #0 !dbg !30 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %ReturnU64.call = call i64 @_Z9ReturnU64v(), !dbg !29
-// CHECK:STDOUT:   ret i64 %ReturnU64.call, !dbg !30
+// CHECK:STDOUT:   %ReturnU64.call = call i64 @_Z9ReturnU64v(), !dbg !34
+// CHECK:STDOUT:   ret i64 %ReturnU64.call, !dbg !35
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: declare i64 @_Z9ReturnU64v()
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define i8 @_CGetI8.Main() #0 !dbg !31 {
+// CHECK:STDOUT: define i8 @_CGetI8.Main() #0 !dbg !36 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc11_40.1.temp = alloca i8, align 1, !dbg !35
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc11_40.1.temp), !dbg !35
-// CHECK:STDOUT:   call void @_Z8ReturnI8v.carbon_thunk(ptr %.loc11_40.1.temp), !dbg !35
-// CHECK:STDOUT:   %.loc11_40.2 = load i8, ptr %.loc11_40.1.temp, align 1, !dbg !35
-// CHECK:STDOUT:   ret i8 %.loc11_40.2, !dbg !36
+// CHECK:STDOUT:   %.loc11_40.1.temp = alloca i8, align 1, !dbg !40
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc11_40.1.temp), !dbg !40
+// CHECK:STDOUT:   call void @_Z8ReturnI8v.carbon_thunk(ptr %.loc11_40.1.temp), !dbg !40
+// CHECK:STDOUT:   %.loc11_40.2 = load i8, ptr %.loc11_40.1.temp, align 1, !dbg !40
+// CHECK:STDOUT:   ret i8 %.loc11_40.2, !dbg !41
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define i16 @_CGetI16.Main() #0 !dbg !37 {
+// CHECK:STDOUT: define i16 @_CGetI16.Main() #0 !dbg !42 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc12_43.1.temp = alloca i16, align 2, !dbg !41
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc12_43.1.temp), !dbg !41
-// CHECK:STDOUT:   call void @_Z9ReturnI16v.carbon_thunk(ptr %.loc12_43.1.temp), !dbg !41
-// CHECK:STDOUT:   %.loc12_43.2 = load i16, ptr %.loc12_43.1.temp, align 2, !dbg !41
-// CHECK:STDOUT:   ret i16 %.loc12_43.2, !dbg !42
+// CHECK:STDOUT:   %.loc12_43.1.temp = alloca i16, align 2, !dbg !46
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc12_43.1.temp), !dbg !46
+// CHECK:STDOUT:   call void @_Z9ReturnI16v.carbon_thunk(ptr %.loc12_43.1.temp), !dbg !46
+// CHECK:STDOUT:   %.loc12_43.2 = load i16, ptr %.loc12_43.1.temp, align 2, !dbg !46
+// CHECK:STDOUT:   ret i16 %.loc12_43.2, !dbg !47
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define i32 @_CGetI32.Main() #0 !dbg !43 {
+// CHECK:STDOUT: define i32 @_CGetI32.Main() #0 !dbg !48 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %ReturnI32.call = call i32 @_Z9ReturnI32v(), !dbg !47
-// CHECK:STDOUT:   ret i32 %ReturnI32.call, !dbg !48
+// CHECK:STDOUT:   %ReturnI32.call = call i32 @_Z9ReturnI32v(), !dbg !52
+// CHECK:STDOUT:   ret i32 %ReturnI32.call, !dbg !53
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: declare i32 @_Z9ReturnI32v()
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define i64 @_CGetI64.Main() #0 !dbg !49 {
+// CHECK:STDOUT: define i64 @_CGetI64.Main() #0 !dbg !54 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %ReturnI64.call = call i64 @_Z9ReturnI64v(), !dbg !53
-// CHECK:STDOUT:   ret i64 %ReturnI64.call, !dbg !54
+// CHECK:STDOUT:   %ReturnI64.call = call i64 @_Z9ReturnI64v(), !dbg !58
+// CHECK:STDOUT:   ret i64 %ReturnI64.call, !dbg !59
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: declare i64 @_Z9ReturnI64v()
@@ -196,252 +196,266 @@ fn Call(x: Cpp.D) -> Cpp.C {
 // CHECK:STDOUT: declare void @_CUse.Main(i8, i16, i32, i64, i8, i16, i32, i64)
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CLets.Main() #0 !dbg !55 {
+// CHECK:STDOUT: define void @_CLets.Main() #0 !dbg !60 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc19_32.1.temp = alloca i8, align 1, !dbg !58
-// CHECK:STDOUT:   %.loc20_35.1.temp = alloca i16, align 2, !dbg !59
-// CHECK:STDOUT:   %.loc24_32.1.temp = alloca i8, align 1, !dbg !60
-// CHECK:STDOUT:   %.loc25_35.1.temp = alloca i16, align 2, !dbg !61
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc19_32.1.temp), !dbg !58
-// CHECK:STDOUT:   call void @_Z8ReturnU8v.carbon_thunk(ptr %.loc19_32.1.temp), !dbg !58
-// CHECK:STDOUT:   %.loc19_32.2 = load i8, ptr %.loc19_32.1.temp, align 1, !dbg !58
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc20_35.1.temp), !dbg !59
-// CHECK:STDOUT:   call void @_Z9ReturnU16v.carbon_thunk(ptr %.loc20_35.1.temp), !dbg !59
-// CHECK:STDOUT:   %.loc20_35.2 = load i16, ptr %.loc20_35.1.temp, align 2, !dbg !59
-// CHECK:STDOUT:   %ReturnU32.call = call i32 @_Z9ReturnU32v(), !dbg !62
-// CHECK:STDOUT:   %ReturnU64.call = call i64 @_Z9ReturnU64v(), !dbg !63
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc24_32.1.temp), !dbg !60
-// CHECK:STDOUT:   call void @_Z8ReturnI8v.carbon_thunk(ptr %.loc24_32.1.temp), !dbg !60
-// CHECK:STDOUT:   %.loc24_32.2 = load i8, ptr %.loc24_32.1.temp, align 1, !dbg !60
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc25_35.1.temp), !dbg !61
-// CHECK:STDOUT:   call void @_Z9ReturnI16v.carbon_thunk(ptr %.loc25_35.1.temp), !dbg !61
-// CHECK:STDOUT:   %.loc25_35.2 = load i16, ptr %.loc25_35.1.temp, align 2, !dbg !61
-// CHECK:STDOUT:   %ReturnI32.call = call i32 @_Z9ReturnI32v(), !dbg !64
-// CHECK:STDOUT:   %ReturnI64.call = call i64 @_Z9ReturnI64v(), !dbg !65
-// CHECK:STDOUT:   call void @_CUse.Main(i8 %.loc19_32.2, i16 %.loc20_35.2, i32 %ReturnU32.call, i64 %ReturnU64.call, i8 %.loc24_32.2, i16 %.loc25_35.2, i32 %ReturnI32.call, i64 %ReturnI64.call), !dbg !66
-// CHECK:STDOUT:   ret void, !dbg !67
+// CHECK:STDOUT:   %.loc19_32.1.temp = alloca i8, align 1, !dbg !63
+// CHECK:STDOUT:   %.loc20_35.1.temp = alloca i16, align 2, !dbg !64
+// CHECK:STDOUT:   %.loc24_32.1.temp = alloca i8, align 1, !dbg !65
+// CHECK:STDOUT:   %.loc25_35.1.temp = alloca i16, align 2, !dbg !66
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc19_32.1.temp), !dbg !63
+// CHECK:STDOUT:   call void @_Z8ReturnU8v.carbon_thunk(ptr %.loc19_32.1.temp), !dbg !63
+// CHECK:STDOUT:   %.loc19_32.2 = load i8, ptr %.loc19_32.1.temp, align 1, !dbg !63
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc20_35.1.temp), !dbg !64
+// CHECK:STDOUT:   call void @_Z9ReturnU16v.carbon_thunk(ptr %.loc20_35.1.temp), !dbg !64
+// CHECK:STDOUT:   %.loc20_35.2 = load i16, ptr %.loc20_35.1.temp, align 2, !dbg !64
+// CHECK:STDOUT:   %ReturnU32.call = call i32 @_Z9ReturnU32v(), !dbg !67
+// CHECK:STDOUT:   %ReturnU64.call = call i64 @_Z9ReturnU64v(), !dbg !68
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc24_32.1.temp), !dbg !65
+// CHECK:STDOUT:   call void @_Z8ReturnI8v.carbon_thunk(ptr %.loc24_32.1.temp), !dbg !65
+// CHECK:STDOUT:   %.loc24_32.2 = load i8, ptr %.loc24_32.1.temp, align 1, !dbg !65
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc25_35.1.temp), !dbg !66
+// CHECK:STDOUT:   call void @_Z9ReturnI16v.carbon_thunk(ptr %.loc25_35.1.temp), !dbg !66
+// CHECK:STDOUT:   %.loc25_35.2 = load i16, ptr %.loc25_35.1.temp, align 2, !dbg !66
+// CHECK:STDOUT:   %ReturnI32.call = call i32 @_Z9ReturnI32v(), !dbg !69
+// CHECK:STDOUT:   %ReturnI64.call = call i64 @_Z9ReturnI64v(), !dbg !70
+// CHECK:STDOUT:   call void @_CUse.Main(i8 %.loc19_32.2, i16 %.loc20_35.2, i32 %ReturnU32.call, i64 %ReturnU64.call, i8 %.loc24_32.2, i16 %.loc25_35.2, i32 %ReturnI32.call, i64 %ReturnI64.call), !dbg !71
+// CHECK:STDOUT:   ret void, !dbg !72
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CVars.Main() #0 !dbg !68 {
+// CHECK:STDOUT: define void @_CVars.Main() #0 !dbg !73 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %my_u8.var = alloca i8, align 1, !dbg !69
-// CHECK:STDOUT:   %.loc33_32.1.temp = alloca i8, align 1, !dbg !70
-// CHECK:STDOUT:   %my_u16.var = alloca i16, align 2, !dbg !71
-// CHECK:STDOUT:   %.loc34_35.1.temp = alloca i16, align 2, !dbg !72
-// CHECK:STDOUT:   %my_u32.var = alloca i32, align 4, !dbg !73
-// CHECK:STDOUT:   %my_u64.var = alloca i64, align 8, !dbg !74
-// CHECK:STDOUT:   %my_i8.var = alloca i8, align 1, !dbg !75
-// CHECK:STDOUT:   %.loc38_32.1.temp = alloca i8, align 1, !dbg !76
-// CHECK:STDOUT:   %my_i16.var = alloca i16, align 2, !dbg !77
-// CHECK:STDOUT:   %.loc39_35.1.temp = alloca i16, align 2, !dbg !78
-// CHECK:STDOUT:   %my_i32.var = alloca i32, align 4, !dbg !79
-// CHECK:STDOUT:   %my_i64.var = alloca i64, align 8, !dbg !80
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %my_u8.var), !dbg !69
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc33_32.1.temp), !dbg !70
-// CHECK:STDOUT:   call void @_Z8ReturnU8v.carbon_thunk(ptr %.loc33_32.1.temp), !dbg !70
-// CHECK:STDOUT:   %.loc33_32.2 = load i8, ptr %.loc33_32.1.temp, align 1, !dbg !70
-// CHECK:STDOUT:   store i8 %.loc33_32.2, ptr %my_u8.var, align 1, !dbg !69
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %my_u16.var), !dbg !71
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc34_35.1.temp), !dbg !72
-// CHECK:STDOUT:   call void @_Z9ReturnU16v.carbon_thunk(ptr %.loc34_35.1.temp), !dbg !72
-// CHECK:STDOUT:   %.loc34_35.2 = load i16, ptr %.loc34_35.1.temp, align 2, !dbg !72
-// CHECK:STDOUT:   store i16 %.loc34_35.2, ptr %my_u16.var, align 2, !dbg !71
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %my_u32.var), !dbg !73
-// CHECK:STDOUT:   %ReturnU32.call = call i32 @_Z9ReturnU32v(), !dbg !81
-// CHECK:STDOUT:   store i32 %ReturnU32.call, ptr %my_u32.var, align 4, !dbg !73
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %my_u64.var), !dbg !74
-// CHECK:STDOUT:   %ReturnU64.call = call i64 @_Z9ReturnU64v(), !dbg !82
-// CHECK:STDOUT:   store i64 %ReturnU64.call, ptr %my_u64.var, align 4, !dbg !74
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %my_i8.var), !dbg !75
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc38_32.1.temp), !dbg !76
-// CHECK:STDOUT:   call void @_Z8ReturnI8v.carbon_thunk(ptr %.loc38_32.1.temp), !dbg !76
-// CHECK:STDOUT:   %.loc38_32.2 = load i8, ptr %.loc38_32.1.temp, align 1, !dbg !76
-// CHECK:STDOUT:   store i8 %.loc38_32.2, ptr %my_i8.var, align 1, !dbg !75
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %my_i16.var), !dbg !77
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc39_35.1.temp), !dbg !78
-// CHECK:STDOUT:   call void @_Z9ReturnI16v.carbon_thunk(ptr %.loc39_35.1.temp), !dbg !78
-// CHECK:STDOUT:   %.loc39_35.2 = load i16, ptr %.loc39_35.1.temp, align 2, !dbg !78
-// CHECK:STDOUT:   store i16 %.loc39_35.2, ptr %my_i16.var, align 2, !dbg !77
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %my_i32.var), !dbg !79
-// CHECK:STDOUT:   %ReturnI32.call = call i32 @_Z9ReturnI32v(), !dbg !83
-// CHECK:STDOUT:   store i32 %ReturnI32.call, ptr %my_i32.var, align 4, !dbg !79
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %my_i64.var), !dbg !80
-// CHECK:STDOUT:   %ReturnI64.call = call i64 @_Z9ReturnI64v(), !dbg !84
-// CHECK:STDOUT:   store i64 %ReturnI64.call, ptr %my_i64.var, align 4, !dbg !80
-// CHECK:STDOUT:   %.loc43_7 = load i8, ptr %my_u8.var, align 1, !dbg !85
-// CHECK:STDOUT:   %.loc43_14 = load i16, ptr %my_u16.var, align 2, !dbg !86
-// CHECK:STDOUT:   %.loc43_22 = load i32, ptr %my_u32.var, align 4, !dbg !87
-// CHECK:STDOUT:   %.loc43_30 = load i64, ptr %my_u64.var, align 4, !dbg !88
-// CHECK:STDOUT:   %.loc43_38 = load i8, ptr %my_i8.var, align 1, !dbg !89
-// CHECK:STDOUT:   %.loc43_45 = load i16, ptr %my_i16.var, align 2, !dbg !90
-// CHECK:STDOUT:   %.loc43_53 = load i32, ptr %my_i32.var, align 4, !dbg !91
-// CHECK:STDOUT:   %.loc43_61 = load i64, ptr %my_i64.var, align 4, !dbg !92
-// CHECK:STDOUT:   call void @_CUse.Main(i8 %.loc43_7, i16 %.loc43_14, i32 %.loc43_22, i64 %.loc43_30, i8 %.loc43_38, i16 %.loc43_45, i32 %.loc43_53, i64 %.loc43_61), !dbg !93
-// CHECK:STDOUT:   ret void, !dbg !94
+// CHECK:STDOUT:   %my_u8.var = alloca i8, align 1, !dbg !74
+// CHECK:STDOUT:   %.loc33_32.1.temp = alloca i8, align 1, !dbg !75
+// CHECK:STDOUT:   %my_u16.var = alloca i16, align 2, !dbg !76
+// CHECK:STDOUT:   %.loc34_35.1.temp = alloca i16, align 2, !dbg !77
+// CHECK:STDOUT:   %my_u32.var = alloca i32, align 4, !dbg !78
+// CHECK:STDOUT:   %my_u64.var = alloca i64, align 8, !dbg !79
+// CHECK:STDOUT:   %my_i8.var = alloca i8, align 1, !dbg !80
+// CHECK:STDOUT:   %.loc38_32.1.temp = alloca i8, align 1, !dbg !81
+// CHECK:STDOUT:   %my_i16.var = alloca i16, align 2, !dbg !82
+// CHECK:STDOUT:   %.loc39_35.1.temp = alloca i16, align 2, !dbg !83
+// CHECK:STDOUT:   %my_i32.var = alloca i32, align 4, !dbg !84
+// CHECK:STDOUT:   %my_i64.var = alloca i64, align 8, !dbg !85
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %my_u8.var), !dbg !74
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc33_32.1.temp), !dbg !75
+// CHECK:STDOUT:   call void @_Z8ReturnU8v.carbon_thunk(ptr %.loc33_32.1.temp), !dbg !75
+// CHECK:STDOUT:   %.loc33_32.2 = load i8, ptr %.loc33_32.1.temp, align 1, !dbg !75
+// CHECK:STDOUT:   store i8 %.loc33_32.2, ptr %my_u8.var, align 1, !dbg !74
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %my_u16.var), !dbg !76
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc34_35.1.temp), !dbg !77
+// CHECK:STDOUT:   call void @_Z9ReturnU16v.carbon_thunk(ptr %.loc34_35.1.temp), !dbg !77
+// CHECK:STDOUT:   %.loc34_35.2 = load i16, ptr %.loc34_35.1.temp, align 2, !dbg !77
+// CHECK:STDOUT:   store i16 %.loc34_35.2, ptr %my_u16.var, align 2, !dbg !76
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %my_u32.var), !dbg !78
+// CHECK:STDOUT:   %ReturnU32.call = call i32 @_Z9ReturnU32v(), !dbg !86
+// CHECK:STDOUT:   store i32 %ReturnU32.call, ptr %my_u32.var, align 4, !dbg !78
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %my_u64.var), !dbg !79
+// CHECK:STDOUT:   %ReturnU64.call = call i64 @_Z9ReturnU64v(), !dbg !87
+// CHECK:STDOUT:   store i64 %ReturnU64.call, ptr %my_u64.var, align 4, !dbg !79
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %my_i8.var), !dbg !80
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc38_32.1.temp), !dbg !81
+// CHECK:STDOUT:   call void @_Z8ReturnI8v.carbon_thunk(ptr %.loc38_32.1.temp), !dbg !81
+// CHECK:STDOUT:   %.loc38_32.2 = load i8, ptr %.loc38_32.1.temp, align 1, !dbg !81
+// CHECK:STDOUT:   store i8 %.loc38_32.2, ptr %my_i8.var, align 1, !dbg !80
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %my_i16.var), !dbg !82
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc39_35.1.temp), !dbg !83
+// CHECK:STDOUT:   call void @_Z9ReturnI16v.carbon_thunk(ptr %.loc39_35.1.temp), !dbg !83
+// CHECK:STDOUT:   %.loc39_35.2 = load i16, ptr %.loc39_35.1.temp, align 2, !dbg !83
+// CHECK:STDOUT:   store i16 %.loc39_35.2, ptr %my_i16.var, align 2, !dbg !82
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %my_i32.var), !dbg !84
+// CHECK:STDOUT:   %ReturnI32.call = call i32 @_Z9ReturnI32v(), !dbg !88
+// CHECK:STDOUT:   store i32 %ReturnI32.call, ptr %my_i32.var, align 4, !dbg !84
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %my_i64.var), !dbg !85
+// CHECK:STDOUT:   %ReturnI64.call = call i64 @_Z9ReturnI64v(), !dbg !89
+// CHECK:STDOUT:   store i64 %ReturnI64.call, ptr %my_i64.var, align 4, !dbg !85
+// CHECK:STDOUT:   %.loc43_7 = load i8, ptr %my_u8.var, align 1, !dbg !90
+// CHECK:STDOUT:   %.loc43_14 = load i16, ptr %my_u16.var, align 2, !dbg !91
+// CHECK:STDOUT:   %.loc43_22 = load i32, ptr %my_u32.var, align 4, !dbg !92
+// CHECK:STDOUT:   %.loc43_30 = load i64, ptr %my_u64.var, align 4, !dbg !93
+// CHECK:STDOUT:   %.loc43_38 = load i8, ptr %my_i8.var, align 1, !dbg !94
+// CHECK:STDOUT:   %.loc43_45 = load i16, ptr %my_i16.var, align 2, !dbg !95
+// CHECK:STDOUT:   %.loc43_53 = load i32, ptr %my_i32.var, align 4, !dbg !96
+// CHECK:STDOUT:   %.loc43_61 = load i64, ptr %my_i64.var, align 4, !dbg !97
+// CHECK:STDOUT:   call void @_CUse.Main(i8 %.loc43_7, i16 %.loc43_14, i32 %.loc43_22, i64 %.loc43_30, i8 %.loc43_38, i16 %.loc43_45, i32 %.loc43_53, i64 %.loc43_61), !dbg !98
+// CHECK:STDOUT:   ret void, !dbg !99
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
 // CHECK:STDOUT: declare void @llvm.lifetime.start.p0(ptr captures(none)) #1
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local void @_Z8ReturnU8v.carbon_thunk(ptr %return) #2 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local void @_Z8ReturnU8v.carbon_thunk(ptr noundef %return) #2 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %return.addr = alloca ptr, align 8
-// CHECK:STDOUT:   store ptr %return, ptr %return.addr, align 8
-// CHECK:STDOUT:   %0 = load ptr, ptr %return.addr, align 8
-// CHECK:STDOUT:   %call = call zeroext i8 @_Z8ReturnU8v()
-// CHECK:STDOUT:   store i8 %call, ptr %0, align 1
+// CHECK:STDOUT:   store ptr %return, ptr %return.addr, align 8, !tbaa !100
+// CHECK:STDOUT:   %0 = load ptr, ptr %return.addr, align 8, !tbaa !100
+// CHECK:STDOUT:   %call = call noundef zeroext i8 @_Z8ReturnU8v()
+// CHECK:STDOUT:   store i8 %call, ptr %0, align 1, !tbaa !103
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare zeroext i8 @_Z8ReturnU8v() #3
+// CHECK:STDOUT: declare noundef zeroext i8 @_Z8ReturnU8v() #3
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local void @_Z9ReturnU16v.carbon_thunk(ptr %return) #2 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local void @_Z9ReturnU16v.carbon_thunk(ptr noundef %return) #2 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %return.addr = alloca ptr, align 8
-// CHECK:STDOUT:   store ptr %return, ptr %return.addr, align 8
-// CHECK:STDOUT:   %0 = load ptr, ptr %return.addr, align 8
-// CHECK:STDOUT:   %call = call zeroext i16 @_Z9ReturnU16v()
-// CHECK:STDOUT:   store i16 %call, ptr %0, align 2
+// CHECK:STDOUT:   store ptr %return, ptr %return.addr, align 8, !tbaa !104
+// CHECK:STDOUT:   %0 = load ptr, ptr %return.addr, align 8, !tbaa !104
+// CHECK:STDOUT:   %call = call noundef zeroext i16 @_Z9ReturnU16v()
+// CHECK:STDOUT:   store i16 %call, ptr %0, align 2, !tbaa !106
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare zeroext i16 @_Z9ReturnU16v() #3
+// CHECK:STDOUT: declare noundef zeroext i16 @_Z9ReturnU16v() #3
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local void @_Z8ReturnI8v.carbon_thunk(ptr %return) #2 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local void @_Z8ReturnI8v.carbon_thunk(ptr noundef %return) #2 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %return.addr = alloca ptr, align 8
-// CHECK:STDOUT:   store ptr %return, ptr %return.addr, align 8
-// CHECK:STDOUT:   %0 = load ptr, ptr %return.addr, align 8
-// CHECK:STDOUT:   %call = call signext i8 @_Z8ReturnI8v()
-// CHECK:STDOUT:   store i8 %call, ptr %0, align 1
+// CHECK:STDOUT:   store ptr %return, ptr %return.addr, align 8, !tbaa !100
+// CHECK:STDOUT:   %0 = load ptr, ptr %return.addr, align 8, !tbaa !100
+// CHECK:STDOUT:   %call = call noundef signext i8 @_Z8ReturnI8v()
+// CHECK:STDOUT:   store i8 %call, ptr %0, align 1, !tbaa !103
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare signext i8 @_Z8ReturnI8v() #3
+// CHECK:STDOUT: declare noundef signext i8 @_Z8ReturnI8v() #3
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local void @_Z9ReturnI16v.carbon_thunk(ptr %return) #2 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local void @_Z9ReturnI16v.carbon_thunk(ptr noundef %return) #2 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %return.addr = alloca ptr, align 8
-// CHECK:STDOUT:   store ptr %return, ptr %return.addr, align 8
-// CHECK:STDOUT:   %0 = load ptr, ptr %return.addr, align 8
-// CHECK:STDOUT:   %call = call signext i16 @_Z9ReturnI16v()
-// CHECK:STDOUT:   store i16 %call, ptr %0, align 2
+// CHECK:STDOUT:   store ptr %return, ptr %return.addr, align 8, !tbaa !104
+// CHECK:STDOUT:   %0 = load ptr, ptr %return.addr, align 8, !tbaa !104
+// CHECK:STDOUT:   %call = call noundef signext i16 @_Z9ReturnI16v()
+// CHECK:STDOUT:   store i16 %call, ptr %0, align 2, !tbaa !106
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare signext i16 @_Z9ReturnI16v() #3
+// CHECK:STDOUT: declare noundef signext i16 @_Z9ReturnI16v() #3
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; uselistorder directives
 // CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0 }
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
-// CHECK:STDOUT: attributes #2 = { alwaysinline mustprogress "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
-// CHECK:STDOUT: attributes #3 = { "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #2 = { alwaysinline mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #3 = { "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "import_ints.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "GetU8", linkageName: "_CGetU8.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{!10}
-// CHECK:STDOUT: !10 = !DIBasicType(name: "int", size: 8, encoding: DW_ATE_unsigned)
-// CHECK:STDOUT: !11 = !DILocation(line: 6, column: 27, scope: !7)
-// CHECK:STDOUT: !12 = !DILocation(line: 6, column: 20, scope: !7)
-// CHECK:STDOUT: !13 = distinct !DISubprogram(name: "GetU16", linkageName: "_CGetU16.Main", scope: null, file: !6, line: 7, type: !14, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !14 = !DISubroutineType(types: !15)
-// CHECK:STDOUT: !15 = !{!16}
-// CHECK:STDOUT: !16 = !DIBasicType(name: "int", size: 16, encoding: DW_ATE_unsigned)
-// CHECK:STDOUT: !17 = !DILocation(line: 7, column: 29, scope: !13)
-// CHECK:STDOUT: !18 = !DILocation(line: 7, column: 22, scope: !13)
-// CHECK:STDOUT: !19 = distinct !DISubprogram(name: "GetU32", linkageName: "_CGetU32.Main", scope: null, file: !6, line: 8, type: !20, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !20 = !DISubroutineType(types: !21)
-// CHECK:STDOUT: !21 = !{!22}
-// CHECK:STDOUT: !22 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_unsigned)
-// CHECK:STDOUT: !23 = !DILocation(line: 8, column: 29, scope: !19)
-// CHECK:STDOUT: !24 = !DILocation(line: 8, column: 22, scope: !19)
-// CHECK:STDOUT: !25 = distinct !DISubprogram(name: "GetU64", linkageName: "_CGetU64.Main", scope: null, file: !6, line: 9, type: !26, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !26 = !DISubroutineType(types: !27)
-// CHECK:STDOUT: !27 = !{!28}
-// CHECK:STDOUT: !28 = !DIBasicType(name: "int", size: 64, encoding: DW_ATE_unsigned)
-// CHECK:STDOUT: !29 = !DILocation(line: 9, column: 29, scope: !25)
-// CHECK:STDOUT: !30 = !DILocation(line: 9, column: 22, scope: !25)
-// CHECK:STDOUT: !31 = distinct !DISubprogram(name: "GetI8", linkageName: "_CGetI8.Main", scope: null, file: !6, line: 11, type: !32, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !32 = !DISubroutineType(types: !33)
-// CHECK:STDOUT: !33 = !{!34}
-// CHECK:STDOUT: !34 = !DIBasicType(name: "int", size: 8, encoding: DW_ATE_signed)
-// CHECK:STDOUT: !35 = !DILocation(line: 11, column: 27, scope: !31)
-// CHECK:STDOUT: !36 = !DILocation(line: 11, column: 20, scope: !31)
-// CHECK:STDOUT: !37 = distinct !DISubprogram(name: "GetI16", linkageName: "_CGetI16.Main", scope: null, file: !6, line: 12, type: !38, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !38 = !DISubroutineType(types: !39)
-// CHECK:STDOUT: !39 = !{!40}
-// CHECK:STDOUT: !40 = !DIBasicType(name: "int", size: 16, encoding: DW_ATE_signed)
-// CHECK:STDOUT: !41 = !DILocation(line: 12, column: 29, scope: !37)
-// CHECK:STDOUT: !42 = !DILocation(line: 12, column: 22, scope: !37)
-// CHECK:STDOUT: !43 = distinct !DISubprogram(name: "GetI32", linkageName: "_CGetI32.Main", scope: null, file: !6, line: 13, type: !44, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !44 = !DISubroutineType(types: !45)
-// CHECK:STDOUT: !45 = !{!46}
-// CHECK:STDOUT: !46 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
-// CHECK:STDOUT: !47 = !DILocation(line: 13, column: 29, scope: !43)
-// CHECK:STDOUT: !48 = !DILocation(line: 13, column: 22, scope: !43)
-// CHECK:STDOUT: !49 = distinct !DISubprogram(name: "GetI64", linkageName: "_CGetI64.Main", scope: null, file: !6, line: 14, type: !50, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !50 = !DISubroutineType(types: !51)
-// CHECK:STDOUT: !51 = !{!52}
-// CHECK:STDOUT: !52 = !DIBasicType(name: "int", size: 64, encoding: DW_ATE_signed)
-// CHECK:STDOUT: !53 = !DILocation(line: 14, column: 29, scope: !49)
-// CHECK:STDOUT: !54 = !DILocation(line: 14, column: 22, scope: !49)
-// CHECK:STDOUT: !55 = distinct !DISubprogram(name: "Lets", linkageName: "_CLets.Main", scope: null, file: !6, line: 18, type: !56, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !56 = !DISubroutineType(types: !57)
-// CHECK:STDOUT: !57 = !{null}
-// CHECK:STDOUT: !58 = !DILocation(line: 19, column: 19, scope: !55)
-// CHECK:STDOUT: !59 = !DILocation(line: 20, column: 21, scope: !55)
-// CHECK:STDOUT: !60 = !DILocation(line: 24, column: 19, scope: !55)
-// CHECK:STDOUT: !61 = !DILocation(line: 25, column: 21, scope: !55)
-// CHECK:STDOUT: !62 = !DILocation(line: 21, column: 21, scope: !55)
-// CHECK:STDOUT: !63 = !DILocation(line: 22, column: 21, scope: !55)
-// CHECK:STDOUT: !64 = !DILocation(line: 26, column: 21, scope: !55)
-// CHECK:STDOUT: !65 = !DILocation(line: 27, column: 21, scope: !55)
-// CHECK:STDOUT: !66 = !DILocation(line: 29, column: 3, scope: !55)
-// CHECK:STDOUT: !67 = !DILocation(line: 18, column: 1, scope: !55)
-// CHECK:STDOUT: !68 = distinct !DISubprogram(name: "Vars", linkageName: "_CVars.Main", scope: null, file: !6, line: 32, type: !56, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !69 = !DILocation(line: 33, column: 3, scope: !68)
-// CHECK:STDOUT: !70 = !DILocation(line: 33, column: 19, scope: !68)
-// CHECK:STDOUT: !71 = !DILocation(line: 34, column: 3, scope: !68)
-// CHECK:STDOUT: !72 = !DILocation(line: 34, column: 21, scope: !68)
-// CHECK:STDOUT: !73 = !DILocation(line: 35, column: 3, scope: !68)
-// CHECK:STDOUT: !74 = !DILocation(line: 36, column: 3, scope: !68)
-// CHECK:STDOUT: !75 = !DILocation(line: 38, column: 3, scope: !68)
-// CHECK:STDOUT: !76 = !DILocation(line: 38, column: 19, scope: !68)
-// CHECK:STDOUT: !77 = !DILocation(line: 39, column: 3, scope: !68)
-// CHECK:STDOUT: !78 = !DILocation(line: 39, column: 21, scope: !68)
-// CHECK:STDOUT: !79 = !DILocation(line: 40, column: 3, scope: !68)
-// CHECK:STDOUT: !80 = !DILocation(line: 41, column: 3, scope: !68)
-// CHECK:STDOUT: !81 = !DILocation(line: 35, column: 21, scope: !68)
-// CHECK:STDOUT: !82 = !DILocation(line: 36, column: 21, scope: !68)
-// CHECK:STDOUT: !83 = !DILocation(line: 40, column: 21, scope: !68)
-// CHECK:STDOUT: !84 = !DILocation(line: 41, column: 21, scope: !68)
-// CHECK:STDOUT: !85 = !DILocation(line: 43, column: 7, scope: !68)
-// CHECK:STDOUT: !86 = !DILocation(line: 43, column: 14, scope: !68)
-// CHECK:STDOUT: !87 = !DILocation(line: 43, column: 22, scope: !68)
-// CHECK:STDOUT: !88 = !DILocation(line: 43, column: 30, scope: !68)
-// CHECK:STDOUT: !89 = !DILocation(line: 43, column: 38, scope: !68)
-// CHECK:STDOUT: !90 = !DILocation(line: 43, column: 45, scope: !68)
-// CHECK:STDOUT: !91 = !DILocation(line: 43, column: 53, scope: !68)
-// CHECK:STDOUT: !92 = !DILocation(line: 43, column: 61, scope: !68)
-// CHECK:STDOUT: !93 = !DILocation(line: 43, column: 3, scope: !68)
-// CHECK:STDOUT: !94 = !DILocation(line: 32, column: 1, scope: !68)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "import_ints.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "GetU8", linkageName: "_CGetU8.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{!15}
+// CHECK:STDOUT: !15 = !DIBasicType(name: "int", size: 8, encoding: DW_ATE_unsigned)
+// CHECK:STDOUT: !16 = !DILocation(line: 6, column: 27, scope: !12)
+// CHECK:STDOUT: !17 = !DILocation(line: 6, column: 20, scope: !12)
+// CHECK:STDOUT: !18 = distinct !DISubprogram(name: "GetU16", linkageName: "_CGetU16.Main", scope: null, file: !7, line: 7, type: !19, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !19 = !DISubroutineType(types: !20)
+// CHECK:STDOUT: !20 = !{!21}
+// CHECK:STDOUT: !21 = !DIBasicType(name: "int", size: 16, encoding: DW_ATE_unsigned)
+// CHECK:STDOUT: !22 = !DILocation(line: 7, column: 29, scope: !18)
+// CHECK:STDOUT: !23 = !DILocation(line: 7, column: 22, scope: !18)
+// CHECK:STDOUT: !24 = distinct !DISubprogram(name: "GetU32", linkageName: "_CGetU32.Main", scope: null, file: !7, line: 8, type: !25, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !25 = !DISubroutineType(types: !26)
+// CHECK:STDOUT: !26 = !{!27}
+// CHECK:STDOUT: !27 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_unsigned)
+// CHECK:STDOUT: !28 = !DILocation(line: 8, column: 29, scope: !24)
+// CHECK:STDOUT: !29 = !DILocation(line: 8, column: 22, scope: !24)
+// CHECK:STDOUT: !30 = distinct !DISubprogram(name: "GetU64", linkageName: "_CGetU64.Main", scope: null, file: !7, line: 9, type: !31, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !31 = !DISubroutineType(types: !32)
+// CHECK:STDOUT: !32 = !{!33}
+// CHECK:STDOUT: !33 = !DIBasicType(name: "int", size: 64, encoding: DW_ATE_unsigned)
+// CHECK:STDOUT: !34 = !DILocation(line: 9, column: 29, scope: !30)
+// CHECK:STDOUT: !35 = !DILocation(line: 9, column: 22, scope: !30)
+// CHECK:STDOUT: !36 = distinct !DISubprogram(name: "GetI8", linkageName: "_CGetI8.Main", scope: null, file: !7, line: 11, type: !37, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !37 = !DISubroutineType(types: !38)
+// CHECK:STDOUT: !38 = !{!39}
+// CHECK:STDOUT: !39 = !DIBasicType(name: "int", size: 8, encoding: DW_ATE_signed)
+// CHECK:STDOUT: !40 = !DILocation(line: 11, column: 27, scope: !36)
+// CHECK:STDOUT: !41 = !DILocation(line: 11, column: 20, scope: !36)
+// CHECK:STDOUT: !42 = distinct !DISubprogram(name: "GetI16", linkageName: "_CGetI16.Main", scope: null, file: !7, line: 12, type: !43, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !43 = !DISubroutineType(types: !44)
+// CHECK:STDOUT: !44 = !{!45}
+// CHECK:STDOUT: !45 = !DIBasicType(name: "int", size: 16, encoding: DW_ATE_signed)
+// CHECK:STDOUT: !46 = !DILocation(line: 12, column: 29, scope: !42)
+// CHECK:STDOUT: !47 = !DILocation(line: 12, column: 22, scope: !42)
+// CHECK:STDOUT: !48 = distinct !DISubprogram(name: "GetI32", linkageName: "_CGetI32.Main", scope: null, file: !7, line: 13, type: !49, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !49 = !DISubroutineType(types: !50)
+// CHECK:STDOUT: !50 = !{!51}
+// CHECK:STDOUT: !51 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+// CHECK:STDOUT: !52 = !DILocation(line: 13, column: 29, scope: !48)
+// CHECK:STDOUT: !53 = !DILocation(line: 13, column: 22, scope: !48)
+// CHECK:STDOUT: !54 = distinct !DISubprogram(name: "GetI64", linkageName: "_CGetI64.Main", scope: null, file: !7, line: 14, type: !55, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !55 = !DISubroutineType(types: !56)
+// CHECK:STDOUT: !56 = !{!57}
+// CHECK:STDOUT: !57 = !DIBasicType(name: "int", size: 64, encoding: DW_ATE_signed)
+// CHECK:STDOUT: !58 = !DILocation(line: 14, column: 29, scope: !54)
+// CHECK:STDOUT: !59 = !DILocation(line: 14, column: 22, scope: !54)
+// CHECK:STDOUT: !60 = distinct !DISubprogram(name: "Lets", linkageName: "_CLets.Main", scope: null, file: !7, line: 18, type: !61, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !61 = !DISubroutineType(types: !62)
+// CHECK:STDOUT: !62 = !{null}
+// CHECK:STDOUT: !63 = !DILocation(line: 19, column: 19, scope: !60)
+// CHECK:STDOUT: !64 = !DILocation(line: 20, column: 21, scope: !60)
+// CHECK:STDOUT: !65 = !DILocation(line: 24, column: 19, scope: !60)
+// CHECK:STDOUT: !66 = !DILocation(line: 25, column: 21, scope: !60)
+// CHECK:STDOUT: !67 = !DILocation(line: 21, column: 21, scope: !60)
+// CHECK:STDOUT: !68 = !DILocation(line: 22, column: 21, scope: !60)
+// CHECK:STDOUT: !69 = !DILocation(line: 26, column: 21, scope: !60)
+// CHECK:STDOUT: !70 = !DILocation(line: 27, column: 21, scope: !60)
+// CHECK:STDOUT: !71 = !DILocation(line: 29, column: 3, scope: !60)
+// CHECK:STDOUT: !72 = !DILocation(line: 18, column: 1, scope: !60)
+// CHECK:STDOUT: !73 = distinct !DISubprogram(name: "Vars", linkageName: "_CVars.Main", scope: null, file: !7, line: 32, type: !61, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !74 = !DILocation(line: 33, column: 3, scope: !73)
+// CHECK:STDOUT: !75 = !DILocation(line: 33, column: 19, scope: !73)
+// CHECK:STDOUT: !76 = !DILocation(line: 34, column: 3, scope: !73)
+// CHECK:STDOUT: !77 = !DILocation(line: 34, column: 21, scope: !73)
+// CHECK:STDOUT: !78 = !DILocation(line: 35, column: 3, scope: !73)
+// CHECK:STDOUT: !79 = !DILocation(line: 36, column: 3, scope: !73)
+// CHECK:STDOUT: !80 = !DILocation(line: 38, column: 3, scope: !73)
+// CHECK:STDOUT: !81 = !DILocation(line: 38, column: 19, scope: !73)
+// CHECK:STDOUT: !82 = !DILocation(line: 39, column: 3, scope: !73)
+// CHECK:STDOUT: !83 = !DILocation(line: 39, column: 21, scope: !73)
+// CHECK:STDOUT: !84 = !DILocation(line: 40, column: 3, scope: !73)
+// CHECK:STDOUT: !85 = !DILocation(line: 41, column: 3, scope: !73)
+// CHECK:STDOUT: !86 = !DILocation(line: 35, column: 21, scope: !73)
+// CHECK:STDOUT: !87 = !DILocation(line: 36, column: 21, scope: !73)
+// CHECK:STDOUT: !88 = !DILocation(line: 40, column: 21, scope: !73)
+// CHECK:STDOUT: !89 = !DILocation(line: 41, column: 21, scope: !73)
+// CHECK:STDOUT: !90 = !DILocation(line: 43, column: 7, scope: !73)
+// CHECK:STDOUT: !91 = !DILocation(line: 43, column: 14, scope: !73)
+// CHECK:STDOUT: !92 = !DILocation(line: 43, column: 22, scope: !73)
+// CHECK:STDOUT: !93 = !DILocation(line: 43, column: 30, scope: !73)
+// CHECK:STDOUT: !94 = !DILocation(line: 43, column: 38, scope: !73)
+// CHECK:STDOUT: !95 = !DILocation(line: 43, column: 45, scope: !73)
+// CHECK:STDOUT: !96 = !DILocation(line: 43, column: 53, scope: !73)
+// CHECK:STDOUT: !97 = !DILocation(line: 43, column: 61, scope: !73)
+// CHECK:STDOUT: !98 = !DILocation(line: 43, column: 3, scope: !73)
+// CHECK:STDOUT: !99 = !DILocation(line: 32, column: 1, scope: !73)
+// CHECK:STDOUT: !100 = !{!101, !101, i64 0}
+// CHECK:STDOUT: !101 = !{!"p1 omnipotent char", !102, i64 0}
+// CHECK:STDOUT: !102 = !{!"any pointer", !10, i64 0}
+// CHECK:STDOUT: !103 = !{!10, !10, i64 0}
+// CHECK:STDOUT: !104 = !{!105, !105, i64 0}
+// CHECK:STDOUT: !105 = !{!"p1 short", !102, i64 0}
+// CHECK:STDOUT: !106 = !{!107, !107, i64 0}
+// CHECK:STDOUT: !107 = !{!"short", !10, i64 0}
 // CHECK:STDOUT: ; ModuleID = 'import_class.carbon'
 // CHECK:STDOUT: source_filename = "import_class.carbon"
 // CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
@@ -450,43 +464,43 @@ fn Call(x: Cpp.D) -> Cpp.C {
 // CHECK:STDOUT: %struct.X = type { ptr, ptr }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CGetX.Main(ptr sret([16 x i8]) %return) #0 !dbg !7 {
+// CHECK:STDOUT: define void @_CGetX.Main(ptr sret([16 x i8]) %return) #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   call void @_Z4Makev.carbon_thunk(ptr %return), !dbg !11
-// CHECK:STDOUT:   ret void, !dbg !12
+// CHECK:STDOUT:   call void @_Z4Makev.carbon_thunk(ptr %return), !dbg !16
+// CHECK:STDOUT:   ret void, !dbg !17
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CLet.Main() #0 !dbg !13 {
+// CHECK:STDOUT: define void @_CLet.Main() #0 !dbg !18 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc9_27.1.temp = alloca [16 x i8], align 1, !dbg !16
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc9_27.1.temp), !dbg !16
-// CHECK:STDOUT:   call void @_Z4Makev.carbon_thunk(ptr %.loc9_27.1.temp), !dbg !16
-// CHECK:STDOUT:   call void @_ZN1XD1Ev(ptr %.loc9_27.1.temp), !dbg !16
-// CHECK:STDOUT:   ret void, !dbg !17
+// CHECK:STDOUT:   %.loc9_27.1.temp = alloca [16 x i8], align 1, !dbg !21
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc9_27.1.temp), !dbg !21
+// CHECK:STDOUT:   call void @_Z4Makev.carbon_thunk(ptr %.loc9_27.1.temp), !dbg !21
+// CHECK:STDOUT:   call void @_ZN1XD1Ev(ptr %.loc9_27.1.temp), !dbg !21
+// CHECK:STDOUT:   ret void, !dbg !22
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: declare void @_ZN1XD1Ev(ptr)
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CVar.Main() #0 !dbg !18 {
+// CHECK:STDOUT: define void @_CVar.Main() #0 !dbg !23 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %_.var = alloca [16 x i8], align 1, !dbg !19
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %_.var), !dbg !19
-// CHECK:STDOUT:   call void @_Z4Makev.carbon_thunk(ptr %_.var), !dbg !20
-// CHECK:STDOUT:   call void @_ZN1XD1Ev(ptr %_.var), !dbg !19
-// CHECK:STDOUT:   ret void, !dbg !21
+// CHECK:STDOUT:   %_.var = alloca [16 x i8], align 1, !dbg !24
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %_.var), !dbg !24
+// CHECK:STDOUT:   call void @_Z4Makev.carbon_thunk(ptr %_.var), !dbg !25
+// CHECK:STDOUT:   call void @_ZN1XD1Ev(ptr %_.var), !dbg !24
+// CHECK:STDOUT:   ret void, !dbg !26
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
 // CHECK:STDOUT: declare void @llvm.lifetime.start.p0(ptr captures(none)) #1
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local void @_Z4Makev.carbon_thunk(ptr %return) #2 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local void @_Z4Makev.carbon_thunk(ptr noundef %return) #2 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %return.addr = alloca ptr, align 8
-// CHECK:STDOUT:   store ptr %return, ptr %return.addr, align 8
-// CHECK:STDOUT:   %0 = load ptr, ptr %return.addr, align 8
+// CHECK:STDOUT:   store ptr %return, ptr %return.addr, align 8, !tbaa !27
+// CHECK:STDOUT:   %0 = load ptr, ptr %return.addr, align 8, !tbaa !27
 // CHECK:STDOUT:   call void @_Z4Makev(ptr dead_on_unwind writable sret(%struct.X) align 8 %0)
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
@@ -498,34 +512,43 @@ fn Call(x: Cpp.D) -> Cpp.C {
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
-// CHECK:STDOUT: attributes #2 = { alwaysinline mustprogress "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
-// CHECK:STDOUT: attributes #3 = { "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #2 = { alwaysinline mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #3 = { "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "import_class.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "GetX", linkageName: "_CGetX.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{!10}
-// CHECK:STDOUT: !10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
-// CHECK:STDOUT: !11 = !DILocation(line: 6, column: 29, scope: !7)
-// CHECK:STDOUT: !12 = !DILocation(line: 6, column: 22, scope: !7)
-// CHECK:STDOUT: !13 = distinct !DISubprogram(name: "Let", linkageName: "_CLet.Main", scope: null, file: !6, line: 8, type: !14, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !14 = !DISubroutineType(types: !15)
-// CHECK:STDOUT: !15 = !{null}
-// CHECK:STDOUT: !16 = !DILocation(line: 9, column: 18, scope: !13)
-// CHECK:STDOUT: !17 = !DILocation(line: 8, column: 1, scope: !13)
-// CHECK:STDOUT: !18 = distinct !DISubprogram(name: "Var", linkageName: "_CVar.Main", scope: null, file: !6, line: 12, type: !14, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !19 = !DILocation(line: 13, column: 3, scope: !18)
-// CHECK:STDOUT: !20 = !DILocation(line: 13, column: 18, scope: !18)
-// CHECK:STDOUT: !21 = !DILocation(line: 12, column: 1, scope: !18)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "import_class.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "GetX", linkageName: "_CGetX.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{!15}
+// CHECK:STDOUT: !15 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
+// CHECK:STDOUT: !16 = !DILocation(line: 6, column: 29, scope: !12)
+// CHECK:STDOUT: !17 = !DILocation(line: 6, column: 22, scope: !12)
+// CHECK:STDOUT: !18 = distinct !DISubprogram(name: "Let", linkageName: "_CLet.Main", scope: null, file: !7, line: 8, type: !19, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !19 = !DISubroutineType(types: !20)
+// CHECK:STDOUT: !20 = !{null}
+// CHECK:STDOUT: !21 = !DILocation(line: 9, column: 18, scope: !18)
+// CHECK:STDOUT: !22 = !DILocation(line: 8, column: 1, scope: !18)
+// CHECK:STDOUT: !23 = distinct !DISubprogram(name: "Var", linkageName: "_CVar.Main", scope: null, file: !7, line: 12, type: !19, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !24 = !DILocation(line: 13, column: 3, scope: !23)
+// CHECK:STDOUT: !25 = !DILocation(line: 13, column: 18, scope: !23)
+// CHECK:STDOUT: !26 = !DILocation(line: 12, column: 1, scope: !23)
+// CHECK:STDOUT: !27 = !{!28, !28, i64 0}
+// CHECK:STDOUT: !28 = !{!"p1 _ZTS1X", !29, i64 0}
+// CHECK:STDOUT: !29 = !{!"any pointer", !10, i64 0}
 // CHECK:STDOUT: ; ModuleID = 'indirect_return_with_args.carbon'
 // CHECK:STDOUT: source_filename = "indirect_return_with_args.carbon"
 // CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
@@ -534,23 +557,23 @@ fn Call(x: Cpp.D) -> Cpp.C {
 // CHECK:STDOUT: %class.D = type { i8 }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CCall.Main(ptr sret({}) %return, ptr %x) #0 !dbg !7 {
+// CHECK:STDOUT: define void @_CCall.Main(ptr sret({}) %return, ptr %x) #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   call void @_Z1f1D.carbon_thunk(ptr %x, ptr %return), !dbg !13
-// CHECK:STDOUT:   ret void, !dbg !14
+// CHECK:STDOUT:   call void @_Z1f1D.carbon_thunk(ptr %x, ptr %return), !dbg !18
+// CHECK:STDOUT:   ret void, !dbg !19
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local void @_Z1f1D.carbon_thunk(ptr %0, ptr %return) #1 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local void @_Z1f1D.carbon_thunk(ptr noundef %0, ptr noundef %return) #1 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %.addr = alloca ptr, align 8
 // CHECK:STDOUT:   %return.addr = alloca ptr, align 8
 // CHECK:STDOUT:   %agg.tmp = alloca %class.D, align 1
 // CHECK:STDOUT:   %undef.agg.tmp = alloca %class.D, align 1
-// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8
-// CHECK:STDOUT:   store ptr %return, ptr %return.addr, align 8
-// CHECK:STDOUT:   %1 = load ptr, ptr %return.addr, align 8
-// CHECK:STDOUT:   %2 = load ptr, ptr %.addr, align 8
+// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8, !tbaa !20
+// CHECK:STDOUT:   store ptr %return, ptr %return.addr, align 8, !tbaa !23
+// CHECK:STDOUT:   %1 = load ptr, ptr %return.addr, align 8, !tbaa !23
+// CHECK:STDOUT:   %2 = load ptr, ptr %.addr, align 8, !tbaa !20
 // CHECK:STDOUT:   call void @_Z1f1D()
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
@@ -558,24 +581,35 @@ fn Call(x: Cpp.D) -> Cpp.C {
 // CHECK:STDOUT: declare void @_Z1f1D() #2
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
-// CHECK:STDOUT: attributes #1 = { alwaysinline mustprogress "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
-// CHECK:STDOUT: attributes #2 = { "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #1 = { alwaysinline mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #2 = { "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "indirect_return_with_args.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "Call", linkageName: "_CCall.Main", scope: null, file: !6, line: 10, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !11)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{!10, !10}
-// CHECK:STDOUT: !10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
-// CHECK:STDOUT: !11 = !{!12}
-// CHECK:STDOUT: !12 = !DILocalVariable(arg: 1, scope: !7, type: !10)
-// CHECK:STDOUT: !13 = !DILocation(line: 11, column: 10, scope: !7)
-// CHECK:STDOUT: !14 = !DILocation(line: 11, column: 3, scope: !7)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "indirect_return_with_args.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "Call", linkageName: "_CCall.Main", scope: null, file: !7, line: 10, type: !13, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !16)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{!15, !15}
+// CHECK:STDOUT: !15 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
+// CHECK:STDOUT: !16 = !{!17}
+// CHECK:STDOUT: !17 = !DILocalVariable(arg: 1, scope: !12, type: !15)
+// CHECK:STDOUT: !18 = !DILocation(line: 11, column: 10, scope: !12)
+// CHECK:STDOUT: !19 = !DILocation(line: 11, column: 3, scope: !12)
+// CHECK:STDOUT: !20 = !{!21, !21, i64 0}
+// CHECK:STDOUT: !21 = !{!"p1 _ZTS1D", !22, i64 0}
+// CHECK:STDOUT: !22 = !{!"any pointer", !10, i64 0}
+// CHECK:STDOUT: !23 = !{!24, !24, i64 0}
+// CHECK:STDOUT: !24 = !{!"p1 _ZTS1C", !22, i64 0}

toolchain/lower/testdata/interop/cpp/template.carbon

@@ -97,135 +97,150 @@ fn Call3() {
 // CHECK:STDOUT: $_Z8identityIiET_S0_ = comdat any
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define i32 @_CPassI32.Main(i32 %a) #0 !dbg !7 {
+// CHECK:STDOUT: define i32 @_CPassI32.Main(i32 %a) #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %identity.call = call i32 @_Z8identityIiET_S0_(i32 %a), !dbg !13
-// CHECK:STDOUT:   ret i32 %identity.call, !dbg !14
+// CHECK:STDOUT:   %identity.call = call i32 @_Z8identityIiET_S0_(i32 %a), !dbg !18
+// CHECK:STDOUT:   ret i32 %identity.call, !dbg !19
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CPassClass.Main(ptr sret({}) %return, ptr %a) #0 !dbg !15 {
+// CHECK:STDOUT: define void @_CPassClass.Main(ptr sret({}) %return, ptr %a) #0 !dbg !20 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   call void @_Z8identityI5ClassET_S1_.carbon_thunk(ptr %a, ptr %return), !dbg !21
-// CHECK:STDOUT:   ret void, !dbg !22
+// CHECK:STDOUT:   call void @_Z8identityI5ClassET_S1_.carbon_thunk(ptr %a, ptr %return), !dbg !26
+// CHECK:STDOUT:   ret void, !dbg !27
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local void @_Z8identityI5ClassET_S1_.carbon_thunk(ptr %x, ptr %return) #1 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local void @_Z8identityI5ClassET_S1_.carbon_thunk(ptr noundef %x, ptr noundef %return) #1 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %x.addr = alloca ptr, align 8
 // CHECK:STDOUT:   %return.addr = alloca ptr, align 8
 // CHECK:STDOUT:   %agg.tmp = alloca %class.Class, align 1
 // CHECK:STDOUT:   %undef.agg.tmp = alloca %class.Class, align 1
-// CHECK:STDOUT:   store ptr %x, ptr %x.addr, align 8
-// CHECK:STDOUT:   store ptr %return, ptr %return.addr, align 8
-// CHECK:STDOUT:   %0 = load ptr, ptr %return.addr, align 8
-// CHECK:STDOUT:   %1 = load ptr, ptr %x.addr, align 8
+// CHECK:STDOUT:   store ptr %x, ptr %x.addr, align 8, !tbaa !28
+// CHECK:STDOUT:   store ptr %return, ptr %return.addr, align 8, !tbaa !28
+// CHECK:STDOUT:   %0 = load ptr, ptr %return.addr, align 8, !tbaa !28
+// CHECK:STDOUT:   %1 = load ptr, ptr %x.addr, align 8, !tbaa !28
 // CHECK:STDOUT:   call void @_Z8identityI5ClassET_S1_()
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: mustprogress noinline nounwind optnone
+// CHECK:STDOUT: ; Function Attrs: mustprogress nounwind uwtable
 // CHECK:STDOUT: define linkonce_odr dso_local void @_Z8identityI5ClassET_S1_() #2 comdat {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %x = alloca %class.Class, align 1
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: mustprogress noinline nounwind optnone
-// CHECK:STDOUT: define linkonce_odr dso_local i32 @_Z8identityIiET_S0_(i32 %x) #2 comdat {
+// CHECK:STDOUT: ; Function Attrs: mustprogress nounwind uwtable
+// CHECK:STDOUT: define linkonce_odr dso_local noundef i32 @_Z8identityIiET_S0_(i32 noundef %x) #2 comdat {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %x.addr = alloca i32, align 4
-// CHECK:STDOUT:   store i32 %x, ptr %x.addr, align 4
-// CHECK:STDOUT:   %0 = load i32, ptr %x.addr, align 4
+// CHECK:STDOUT:   store i32 %x, ptr %x.addr, align 4, !tbaa !8
+// CHECK:STDOUT:   %0 = load i32, ptr %x.addr, align 4, !tbaa !8
 // CHECK:STDOUT:   ret i32 %0
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
-// CHECK:STDOUT: attributes #1 = { alwaysinline mustprogress "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
-// CHECK:STDOUT: attributes #2 = { mustprogress noinline nounwind optnone "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #1 = { alwaysinline mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #2 = { mustprogress nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "call.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "PassI32", linkageName: "_CPassI32.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !11)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{!10, !10}
-// CHECK:STDOUT: !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
-// CHECK:STDOUT: !11 = !{!12}
-// CHECK:STDOUT: !12 = !DILocalVariable(arg: 1, scope: !7, type: !10)
-// CHECK:STDOUT: !13 = !DILocation(line: 7, column: 10, scope: !7)
-// CHECK:STDOUT: !14 = !DILocation(line: 7, column: 3, scope: !7)
-// CHECK:STDOUT: !15 = distinct !DISubprogram(name: "PassClass", linkageName: "_CPassClass.Main", scope: null, file: !6, line: 10, type: !16, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !19)
-// CHECK:STDOUT: !16 = !DISubroutineType(types: !17)
-// CHECK:STDOUT: !17 = !{!18, !18}
-// CHECK:STDOUT: !18 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
-// CHECK:STDOUT: !19 = !{!20}
-// CHECK:STDOUT: !20 = !DILocalVariable(arg: 1, scope: !15, type: !18)
-// CHECK:STDOUT: !21 = !DILocation(line: 11, column: 10, scope: !15)
-// CHECK:STDOUT: !22 = !DILocation(line: 11, column: 3, scope: !15)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "call.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "PassI32", linkageName: "_CPassI32.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !16)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{!15, !15}
+// CHECK:STDOUT: !15 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+// CHECK:STDOUT: !16 = !{!17}
+// CHECK:STDOUT: !17 = !DILocalVariable(arg: 1, scope: !12, type: !15)
+// CHECK:STDOUT: !18 = !DILocation(line: 7, column: 10, scope: !12)
+// CHECK:STDOUT: !19 = !DILocation(line: 7, column: 3, scope: !12)
+// CHECK:STDOUT: !20 = distinct !DISubprogram(name: "PassClass", linkageName: "_CPassClass.Main", scope: null, file: !7, line: 10, type: !21, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !24)
+// CHECK:STDOUT: !21 = !DISubroutineType(types: !22)
+// CHECK:STDOUT: !22 = !{!23, !23}
+// CHECK:STDOUT: !23 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
+// CHECK:STDOUT: !24 = !{!25}
+// CHECK:STDOUT: !25 = !DILocalVariable(arg: 1, scope: !20, type: !23)
+// CHECK:STDOUT: !26 = !DILocation(line: 11, column: 10, scope: !20)
+// CHECK:STDOUT: !27 = !DILocation(line: 11, column: 3, scope: !20)
+// CHECK:STDOUT: !28 = !{!29, !29, i64 0}
+// CHECK:STDOUT: !29 = !{!"p1 _ZTS5Class", !30, i64 0}
+// CHECK:STDOUT: !30 = !{!"any pointer", !10, i64 0}
 // CHECK:STDOUT: ; ModuleID = 'variadic.carbon'
 // CHECK:STDOUT: source_filename = "variadic.carbon"
 // CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
 // CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CCall1.Main() #0 !dbg !7 {
+// CHECK:STDOUT: define void @_CCall1.Main() #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   call void @_Z3fooIJEEviDpT_(i32 1), !dbg !10
-// CHECK:STDOUT:   ret void, !dbg !11
+// CHECK:STDOUT:   call void @_Z3fooIJEEviDpT_(i32 1), !dbg !15
+// CHECK:STDOUT:   ret void, !dbg !16
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: declare void @_Z3fooIJEEviDpT_(i32)
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CCall2.Main() #0 !dbg !12 {
+// CHECK:STDOUT: define void @_CCall2.Main() #0 !dbg !17 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   call void @_Z3fooIJiEEviDpT_(i32 1, i32 2), !dbg !13
-// CHECK:STDOUT:   ret void, !dbg !14
+// CHECK:STDOUT:   call void @_Z3fooIJiEEviDpT_(i32 1, i32 2), !dbg !18
+// CHECK:STDOUT:   ret void, !dbg !19
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: declare void @_Z3fooIJiEEviDpT_(i32, i32)
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CCall3.Main() #0 !dbg !15 {
+// CHECK:STDOUT: define void @_CCall3.Main() #0 !dbg !20 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   call void @_Z3fooIJiiEEviDpT_(i32 1, i32 2, i32 3), !dbg !16
-// CHECK:STDOUT:   ret void, !dbg !17
+// CHECK:STDOUT:   call void @_Z3fooIJiiEEviDpT_(i32 1, i32 2, i32 3), !dbg !21
+// CHECK:STDOUT:   ret void, !dbg !22
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: declare void @_Z3fooIJiiEEviDpT_(i32, i32, i32)
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "variadic.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "Call1", linkageName: "_CCall1.Main", scope: null, file: !6, line: 9, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{null}
-// CHECK:STDOUT: !10 = !DILocation(line: 11, column: 3, scope: !7)
-// CHECK:STDOUT: !11 = !DILocation(line: 9, column: 1, scope: !7)
-// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "Call2", linkageName: "_CCall2.Main", scope: null, file: !6, line: 15, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !13 = !DILocation(line: 17, column: 3, scope: !12)
-// CHECK:STDOUT: !14 = !DILocation(line: 15, column: 1, scope: !12)
-// CHECK:STDOUT: !15 = distinct !DISubprogram(name: "Call3", linkageName: "_CCall3.Main", scope: null, file: !6, line: 21, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !16 = !DILocation(line: 23, column: 3, scope: !15)
-// CHECK:STDOUT: !17 = !DILocation(line: 21, column: 1, scope: !15)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "variadic.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "Call1", linkageName: "_CCall1.Main", scope: null, file: !7, line: 9, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{null}
+// CHECK:STDOUT: !15 = !DILocation(line: 11, column: 3, scope: !12)
+// CHECK:STDOUT: !16 = !DILocation(line: 9, column: 1, scope: !12)
+// CHECK:STDOUT: !17 = distinct !DISubprogram(name: "Call2", linkageName: "_CCall2.Main", scope: null, file: !7, line: 15, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !18 = !DILocation(line: 17, column: 3, scope: !17)
+// CHECK:STDOUT: !19 = !DILocation(line: 15, column: 1, scope: !17)
+// CHECK:STDOUT: !20 = distinct !DISubprogram(name: "Call3", linkageName: "_CCall3.Main", scope: null, file: !7, line: 21, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !21 = !DILocation(line: 23, column: 3, scope: !20)
+// CHECK:STDOUT: !22 = !DILocation(line: 21, column: 1, scope: !20)
 // CHECK:STDOUT: ; ModuleID = 'variadic_thunk.carbon'
 // CHECK:STDOUT: source_filename = "variadic_thunk.carbon"
 // CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
@@ -236,33 +251,33 @@ fn Call3() {
 // CHECK:STDOUT: @X.val.loc12_12.3 = internal constant {} zeroinitializer
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CCall1.Main() #0 !dbg !7 {
+// CHECK:STDOUT: define void @_CCall1.Main() #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc12_12.2.temp = alloca {}, align 8, !dbg !10
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc12_12.2.temp), !dbg !10
-// CHECK:STDOUT:   call void @llvm.memcpy.p0.p0.i64(ptr align 1 %.loc12_12.2.temp, ptr align 1 @X.val.loc12_12.3, i64 0, i1 false), !dbg !10
-// CHECK:STDOUT:   call void @_Z3fooIJEEv1XDpT_.carbon_thunk(ptr %.loc12_12.2.temp), !dbg !11
-// CHECK:STDOUT:   ret void, !dbg !12
+// CHECK:STDOUT:   %.loc12_12.2.temp = alloca {}, align 8, !dbg !15
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc12_12.2.temp), !dbg !15
+// CHECK:STDOUT:   call void @llvm.memcpy.p0.p0.i64(ptr align 1 %.loc12_12.2.temp, ptr align 1 @X.val.loc12_12.3, i64 0, i1 false), !dbg !15
+// CHECK:STDOUT:   call void @_Z3fooIJEEv1XDpT_.carbon_thunk(ptr %.loc12_12.2.temp), !dbg !16
+// CHECK:STDOUT:   ret void, !dbg !17
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CCall2.Main() #0 !dbg !13 {
+// CHECK:STDOUT: define void @_CCall2.Main() #0 !dbg !18 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc18_12.2.temp = alloca {}, align 8, !dbg !14
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc18_12.2.temp), !dbg !14
-// CHECK:STDOUT:   call void @llvm.memcpy.p0.p0.i64(ptr align 1 %.loc18_12.2.temp, ptr align 1 @X.val.loc12_12.3, i64 0, i1 false), !dbg !14
-// CHECK:STDOUT:   call void @_Z3fooIJiEEv1XDpT_.carbon_thunk(ptr %.loc18_12.2.temp, i32 2), !dbg !15
-// CHECK:STDOUT:   ret void, !dbg !16
+// CHECK:STDOUT:   %.loc18_12.2.temp = alloca {}, align 8, !dbg !19
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc18_12.2.temp), !dbg !19
+// CHECK:STDOUT:   call void @llvm.memcpy.p0.p0.i64(ptr align 1 %.loc18_12.2.temp, ptr align 1 @X.val.loc12_12.3, i64 0, i1 false), !dbg !19
+// CHECK:STDOUT:   call void @_Z3fooIJiEEv1XDpT_.carbon_thunk(ptr %.loc18_12.2.temp, i32 2), !dbg !20
+// CHECK:STDOUT:   ret void, !dbg !21
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CCall3.Main() #0 !dbg !17 {
+// CHECK:STDOUT: define void @_CCall3.Main() #0 !dbg !22 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc24_12.2.temp = alloca {}, align 8, !dbg !18
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc24_12.2.temp), !dbg !18
-// CHECK:STDOUT:   call void @llvm.memcpy.p0.p0.i64(ptr align 1 %.loc24_12.2.temp, ptr align 1 @X.val.loc12_12.3, i64 0, i1 false), !dbg !18
-// CHECK:STDOUT:   call void @_Z3fooIJiiEEv1XDpT_.carbon_thunk(ptr %.loc24_12.2.temp, i32 2, i32 3), !dbg !19
-// CHECK:STDOUT:   ret void, !dbg !20
+// CHECK:STDOUT:   %.loc24_12.2.temp = alloca {}, align 8, !dbg !23
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc24_12.2.temp), !dbg !23
+// CHECK:STDOUT:   call void @llvm.memcpy.p0.p0.i64(ptr align 1 %.loc24_12.2.temp, ptr align 1 @X.val.loc12_12.3, i64 0, i1 false), !dbg !23
+// CHECK:STDOUT:   call void @_Z3fooIJiiEEv1XDpT_.carbon_thunk(ptr %.loc24_12.2.temp, i32 2, i32 3), !dbg !24
+// CHECK:STDOUT:   ret void, !dbg !25
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
@@ -271,53 +286,53 @@ fn Call3() {
 // CHECK:STDOUT: ; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
 // CHECK:STDOUT: declare void @llvm.memcpy.p0.p0.i64(ptr noalias writeonly captures(none), ptr noalias readonly captures(none), i64, i1 immarg) #2
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local void @_Z3fooIJEEv1XDpT_.carbon_thunk(ptr %0) #3 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local void @_Z3fooIJEEv1XDpT_.carbon_thunk(ptr noundef %0) #3 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %.addr = alloca ptr, align 8
 // CHECK:STDOUT:   %agg.tmp = alloca %class.X, align 1
-// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8
-// CHECK:STDOUT:   %1 = load ptr, ptr %.addr, align 8
+// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8, !tbaa !26
+// CHECK:STDOUT:   %1 = load ptr, ptr %.addr, align 8, !tbaa !26
 // CHECK:STDOUT:   call void @_Z3fooIJEEv1XDpT_()
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: declare void @_Z3fooIJEEv1XDpT_() #4
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local void @_Z3fooIJiEEv1XDpT_.carbon_thunk(ptr %0, i32 %1) #3 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local void @_Z3fooIJiEEv1XDpT_.carbon_thunk(ptr noundef %0, i32 noundef %1) #3 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %.addr = alloca ptr, align 8
 // CHECK:STDOUT:   %.addr1 = alloca i32, align 4
 // CHECK:STDOUT:   %agg.tmp = alloca %class.X, align 1
-// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8
-// CHECK:STDOUT:   store i32 %1, ptr %.addr1, align 4
-// CHECK:STDOUT:   %2 = load ptr, ptr %.addr, align 8
-// CHECK:STDOUT:   %3 = load i32, ptr %.addr1, align 4
-// CHECK:STDOUT:   call void @_Z3fooIJiEEv1XDpT_(i32 %3)
+// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8, !tbaa !26
+// CHECK:STDOUT:   store i32 %1, ptr %.addr1, align 4, !tbaa !8
+// CHECK:STDOUT:   %2 = load ptr, ptr %.addr, align 8, !tbaa !26
+// CHECK:STDOUT:   %3 = load i32, ptr %.addr1, align 4, !tbaa !8
+// CHECK:STDOUT:   call void @_Z3fooIJiEEv1XDpT_(i32 noundef %3)
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare void @_Z3fooIJiEEv1XDpT_(i32) #4
+// CHECK:STDOUT: declare void @_Z3fooIJiEEv1XDpT_(i32 noundef) #4
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local void @_Z3fooIJiiEEv1XDpT_.carbon_thunk(ptr %0, i32 %1, i32 %2) #3 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local void @_Z3fooIJiiEEv1XDpT_.carbon_thunk(ptr noundef %0, i32 noundef %1, i32 noundef %2) #3 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %.addr = alloca ptr, align 8
 // CHECK:STDOUT:   %.addr1 = alloca i32, align 4
 // CHECK:STDOUT:   %.addr2 = alloca i32, align 4
 // CHECK:STDOUT:   %agg.tmp = alloca %class.X, align 1
-// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8
-// CHECK:STDOUT:   store i32 %1, ptr %.addr1, align 4
-// CHECK:STDOUT:   store i32 %2, ptr %.addr2, align 4
-// CHECK:STDOUT:   %3 = load ptr, ptr %.addr, align 8
-// CHECK:STDOUT:   %4 = load i32, ptr %.addr1, align 4
-// CHECK:STDOUT:   %5 = load i32, ptr %.addr2, align 4
-// CHECK:STDOUT:   call void @_Z3fooIJiiEEv1XDpT_(i32 %4, i32 %5)
+// CHECK:STDOUT:   store ptr %0, ptr %.addr, align 8, !tbaa !26
+// CHECK:STDOUT:   store i32 %1, ptr %.addr1, align 4, !tbaa !8
+// CHECK:STDOUT:   store i32 %2, ptr %.addr2, align 4, !tbaa !8
+// CHECK:STDOUT:   %3 = load ptr, ptr %.addr, align 8, !tbaa !26
+// CHECK:STDOUT:   %4 = load i32, ptr %.addr1, align 4, !tbaa !8
+// CHECK:STDOUT:   %5 = load i32, ptr %.addr2, align 4, !tbaa !8
+// CHECK:STDOUT:   call void @_Z3fooIJiiEEv1XDpT_(i32 noundef %4, i32 noundef %5)
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare void @_Z3fooIJiiEEv1XDpT_(i32, i32) #4
+// CHECK:STDOUT: declare void @_Z3fooIJiiEEv1XDpT_(i32 noundef, i32 noundef) #4
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; uselistorder directives
 // CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 2, 1, 0 }
@@ -326,30 +341,39 @@ fn Call3() {
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
 // CHECK:STDOUT: attributes #2 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
-// CHECK:STDOUT: attributes #3 = { alwaysinline mustprogress "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
-// CHECK:STDOUT: attributes #4 = { "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #3 = { alwaysinline mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #4 = { "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "variadic_thunk.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "Call1", linkageName: "_CCall1.Main", scope: null, file: !6, line: 10, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{null}
-// CHECK:STDOUT: !10 = !DILocation(line: 12, column: 11, scope: !7)
-// CHECK:STDOUT: !11 = !DILocation(line: 12, column: 3, scope: !7)
-// CHECK:STDOUT: !12 = !DILocation(line: 10, column: 1, scope: !7)
-// CHECK:STDOUT: !13 = distinct !DISubprogram(name: "Call2", linkageName: "_CCall2.Main", scope: null, file: !6, line: 16, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !14 = !DILocation(line: 18, column: 11, scope: !13)
-// CHECK:STDOUT: !15 = !DILocation(line: 18, column: 3, scope: !13)
-// CHECK:STDOUT: !16 = !DILocation(line: 16, column: 1, scope: !13)
-// CHECK:STDOUT: !17 = distinct !DISubprogram(name: "Call3", linkageName: "_CCall3.Main", scope: null, file: !6, line: 22, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !18 = !DILocation(line: 24, column: 11, scope: !17)
-// CHECK:STDOUT: !19 = !DILocation(line: 24, column: 3, scope: !17)
-// CHECK:STDOUT: !20 = !DILocation(line: 22, column: 1, scope: !17)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "variadic_thunk.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "Call1", linkageName: "_CCall1.Main", scope: null, file: !7, line: 10, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{null}
+// CHECK:STDOUT: !15 = !DILocation(line: 12, column: 11, scope: !12)
+// CHECK:STDOUT: !16 = !DILocation(line: 12, column: 3, scope: !12)
+// CHECK:STDOUT: !17 = !DILocation(line: 10, column: 1, scope: !12)
+// CHECK:STDOUT: !18 = distinct !DISubprogram(name: "Call2", linkageName: "_CCall2.Main", scope: null, file: !7, line: 16, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !19 = !DILocation(line: 18, column: 11, scope: !18)
+// CHECK:STDOUT: !20 = !DILocation(line: 18, column: 3, scope: !18)
+// CHECK:STDOUT: !21 = !DILocation(line: 16, column: 1, scope: !18)
+// CHECK:STDOUT: !22 = distinct !DISubprogram(name: "Call3", linkageName: "_CCall3.Main", scope: null, file: !7, line: 22, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !23 = !DILocation(line: 24, column: 11, scope: !22)
+// CHECK:STDOUT: !24 = !DILocation(line: 24, column: 3, scope: !22)
+// CHECK:STDOUT: !25 = !DILocation(line: 22, column: 1, scope: !22)
+// CHECK:STDOUT: !26 = !{!27, !27, i64 0}
+// CHECK:STDOUT: !27 = !{!"p1 _ZTS1X", !28, i64 0}
+// CHECK:STDOUT: !28 = !{!"any pointer", !10, i64 0}

toolchain/lower/testdata/interop/cpp/virtual_base.carbon

@@ -109,57 +109,57 @@ fn AccessD(d: Cpp.D) -> i32 {
 // CHECK:STDOUT: @_ZTS1D = linkonce_odr dso_local constant [3 x i8] c"1D\00", comdat, align 1
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CMake.Main() #0 !dbg !7 {
+// CHECK:STDOUT: define void @_CMake.Main() #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %_.var = alloca [40 x i8], align 1, !dbg !10
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %_.var), !dbg !10
-// CHECK:STDOUT:   call void @_ZN1DC1Ev.carbon_thunk(ptr %_.var), !dbg !11
-// CHECK:STDOUT:   ret void, !dbg !12
+// CHECK:STDOUT:   %_.var = alloca [40 x i8], align 1, !dbg !15
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %_.var), !dbg !15
+// CHECK:STDOUT:   call void @_ZN1DC1Ev.carbon_thunk(ptr %_.var), !dbg !16
+// CHECK:STDOUT:   ret void, !dbg !17
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define i32 @_CAccessD.Main(ptr %d) #0 !dbg !13 {
+// CHECK:STDOUT: define i32 @_CAccessD.Main(ptr %d) #0 !dbg !18 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc16_11.1.d = getelementptr inbounds nuw [40 x i8], ptr %d, i32 0, i32 28, !dbg !20
-// CHECK:STDOUT:   %.loc16_11.2 = load i32, ptr %.loc16_11.1.d, align 4, !dbg !20
-// CHECK:STDOUT:   ret i32 %.loc16_11.2, !dbg !21
+// CHECK:STDOUT:   %.loc16_11.1.d = getelementptr inbounds nuw [40 x i8], ptr %d, i32 0, i32 28, !dbg !25
+// CHECK:STDOUT:   %.loc16_11.2 = load i32, ptr %.loc16_11.1.d, align 4, !dbg !25
+// CHECK:STDOUT:   ret i32 %.loc16_11.2, !dbg !26
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
 // CHECK:STDOUT: declare void @llvm.lifetime.start.p0(ptr captures(none)) #1
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
-// CHECK:STDOUT: define dso_local void @_ZN1DC1Ev.carbon_thunk(ptr %return) #2 {
+// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
+// CHECK:STDOUT: define dso_local void @_ZN1DC1Ev.carbon_thunk(ptr noundef %return) #2 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %return.addr = alloca ptr, align 8
-// CHECK:STDOUT:   store ptr %return, ptr %return.addr, align 8
-// CHECK:STDOUT:   %0 = load ptr, ptr %return.addr, align 8
-// CHECK:STDOUT:   call void @_ZN1DC1Ev(ptr nonnull align 8 dereferenceable(32) %0)
+// CHECK:STDOUT:   store ptr %return, ptr %return.addr, align 8, !tbaa !27
+// CHECK:STDOUT:   %0 = load ptr, ptr %return.addr, align 8, !tbaa !27
+// CHECK:STDOUT:   call void @_ZN1DC1Ev(ptr noundef nonnull align 8 dereferenceable(32) %0)
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: mustprogress noinline optnone
-// CHECK:STDOUT: define linkonce_odr dso_local void @_ZN1DC1Ev(ptr nonnull align 8 dereferenceable(32) %this) unnamed_addr #3 comdat align 2 {
+// CHECK:STDOUT: ; Function Attrs: inlinehint mustprogress uwtable
+// CHECK:STDOUT: define linkonce_odr dso_local void @_ZN1DC1Ev(ptr noundef nonnull align 8 dereferenceable(32) %this) unnamed_addr #3 comdat align 2 {
 // CHECK:STDOUT: entry:
 // CHECK:STDOUT:   %this.addr = alloca ptr, align 8
-// CHECK:STDOUT:   store ptr %this, ptr %this.addr, align 8
+// CHECK:STDOUT:   store ptr %this, ptr %this.addr, align 8, !tbaa !27
 // CHECK:STDOUT:   %this1 = load ptr, ptr %this.addr, align 8
 // CHECK:STDOUT:   %0 = getelementptr inbounds i8, ptr %this1, i64 32
-// CHECK:STDOUT:   call void @_ZN1AC2Ev(ptr nonnull align 4 dereferenceable(4) %0)
-// CHECK:STDOUT:   call void @_ZN1BC2Ev(ptr nonnull align 8 dereferenceable(12) %this1, ptr getelementptr inbounds ([4 x ptr], ptr @_ZTT1D, i64 0, i64 1))
+// CHECK:STDOUT:   call void @_ZN1AC2Ev(ptr noundef nonnull align 4 dereferenceable(4) %0)
+// CHECK:STDOUT:   call void @_ZN1BC2Ev(ptr noundef nonnull align 8 dereferenceable(12) %this1, ptr noundef getelementptr inbounds ([4 x ptr], ptr @_ZTT1D, i64 0, i64 1))
 // CHECK:STDOUT:   %1 = getelementptr inbounds i8, ptr %this1, i64 16
-// CHECK:STDOUT:   call void @_ZN1CC2Ev(ptr nonnull align 8 dereferenceable(12) %1, ptr getelementptr inbounds ([4 x ptr], ptr @_ZTT1D, i64 0, i64 2))
-// CHECK:STDOUT:   store ptr getelementptr inbounds inrange(-24, 0) ({ [3 x ptr], [3 x ptr] }, ptr @_ZTV1D, i32 0, i32 0, i32 3), ptr %this1, align 8
+// CHECK:STDOUT:   call void @_ZN1CC2Ev(ptr noundef nonnull align 8 dereferenceable(12) %1, ptr noundef getelementptr inbounds ([4 x ptr], ptr @_ZTT1D, i64 0, i64 2))
+// CHECK:STDOUT:   store ptr getelementptr inbounds inrange(-24, 0) ({ [3 x ptr], [3 x ptr] }, ptr @_ZTV1D, i32 0, i32 0, i32 3), ptr %this1, align 8, !tbaa !30
 // CHECK:STDOUT:   %add.ptr = getelementptr inbounds i8, ptr %this1, i64 16
-// CHECK:STDOUT:   store ptr getelementptr inbounds inrange(-24, 0) ({ [3 x ptr], [3 x ptr] }, ptr @_ZTV1D, i32 0, i32 1, i32 3), ptr %add.ptr, align 8
+// CHECK:STDOUT:   store ptr getelementptr inbounds inrange(-24, 0) ({ [3 x ptr], [3 x ptr] }, ptr @_ZTV1D, i32 0, i32 1, i32 3), ptr %add.ptr, align 8, !tbaa !30
 // CHECK:STDOUT:   ret void
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare void @_ZN1AC2Ev(ptr nonnull align 4 dereferenceable(4)) unnamed_addr #4
+// CHECK:STDOUT: declare void @_ZN1AC2Ev(ptr noundef nonnull align 4 dereferenceable(4)) unnamed_addr #4
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare void @_ZN1BC2Ev(ptr nonnull align 8 dereferenceable(12), ptr) unnamed_addr #4
+// CHECK:STDOUT: declare void @_ZN1BC2Ev(ptr noundef nonnull align 8 dereferenceable(12), ptr noundef) unnamed_addr #4
 // CHECK:STDOUT:
-// CHECK:STDOUT: declare void @_ZN1CC2Ev(ptr nonnull align 8 dereferenceable(12), ptr) unnamed_addr #4
+// CHECK:STDOUT: declare void @_ZN1CC2Ev(ptr noundef nonnull align 8 dereferenceable(12), ptr noundef) unnamed_addr #4
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; uselistorder directives
 // CHECK:STDOUT: uselistorder ptr getelementptr inbounds inrange(-24, 0) ({ [3 x ptr], [3 x ptr] }, ptr @_ZTV1D, i32 0, i32 0, i32 3), { 1, 0 }
@@ -172,32 +172,43 @@ fn AccessD(d: Cpp.D) -> i32 {
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
-// CHECK:STDOUT: attributes #2 = { alwaysinline mustprogress "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
-// CHECK:STDOUT: attributes #3 = { mustprogress noinline optnone "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
-// CHECK:STDOUT: attributes #4 = { "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #2 = { alwaysinline mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #3 = { inlinehint mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+// CHECK:STDOUT: attributes #4 = { "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "use_diamond.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "Make", linkageName: "_CMake.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{null}
-// CHECK:STDOUT: !10 = !DILocation(line: 11, column: 3, scope: !7)
-// CHECK:STDOUT: !11 = !DILocation(line: 11, column: 18, scope: !7)
-// CHECK:STDOUT: !12 = !DILocation(line: 6, column: 1, scope: !7)
-// CHECK:STDOUT: !13 = distinct !DISubprogram(name: "AccessD", linkageName: "_CAccessD.Main", scope: null, file: !6, line: 14, type: !14, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !18)
-// CHECK:STDOUT: !14 = !DISubroutineType(types: !15)
-// CHECK:STDOUT: !15 = !{!16, !17}
-// CHECK:STDOUT: !16 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
-// CHECK:STDOUT: !17 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
-// CHECK:STDOUT: !18 = !{!19}
-// CHECK:STDOUT: !19 = !DILocalVariable(arg: 1, scope: !13, type: !17)
-// CHECK:STDOUT: !20 = !DILocation(line: 16, column: 10, scope: !13)
-// CHECK:STDOUT: !21 = !DILocation(line: 16, column: 3, scope: !13)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "use_diamond.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "Make", linkageName: "_CMake.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{null}
+// CHECK:STDOUT: !15 = !DILocation(line: 11, column: 3, scope: !12)
+// CHECK:STDOUT: !16 = !DILocation(line: 11, column: 18, scope: !12)
+// CHECK:STDOUT: !17 = !DILocation(line: 6, column: 1, scope: !12)
+// CHECK:STDOUT: !18 = distinct !DISubprogram(name: "AccessD", linkageName: "_CAccessD.Main", scope: null, file: !7, line: 14, type: !19, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !23)
+// CHECK:STDOUT: !19 = !DISubroutineType(types: !20)
+// CHECK:STDOUT: !20 = !{!21, !22}
+// CHECK:STDOUT: !21 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+// CHECK:STDOUT: !22 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
+// CHECK:STDOUT: !23 = !{!24}
+// CHECK:STDOUT: !24 = !DILocalVariable(arg: 1, scope: !18, type: !22)
+// CHECK:STDOUT: !25 = !DILocation(line: 16, column: 10, scope: !18)
+// CHECK:STDOUT: !26 = !DILocation(line: 16, column: 3, scope: !18)
+// CHECK:STDOUT: !27 = !{!28, !28, i64 0}
+// CHECK:STDOUT: !28 = !{!"p1 _ZTS1D", !29, i64 0}
+// CHECK:STDOUT: !29 = !{!"any pointer", !10, i64 0}
+// CHECK:STDOUT: !30 = !{!31, !31, i64 0}
+// CHECK:STDOUT: !31 = !{!"vtable pointer", !11, i64 0}

toolchain/lower/testdata/interop/cpp/void.carbon

@@ -62,123 +62,123 @@ fn ConvertFromConstVoidPtr(p: const Cpp.void*) -> const i32* {
 // CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CPassVoidPtr.Main(ptr %a) #0 !dbg !7 {
+// CHECK:STDOUT: define void @_CPassVoidPtr.Main(ptr %a) #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc7_21.2.temp = alloca ptr, align 8, !dbg !13
-// CHECK:STDOUT:   %U.binding.as_type.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.e5cf8fcbb4feaae2:ImplicitAs.0f95c9e18c91e00a.Core.5c62f2dbad753cd9"(ptr %a), !dbg !13
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc7_21.2.temp), !dbg !13
-// CHECK:STDOUT:   store ptr %U.binding.as_type.as.ImplicitAs.impl.Convert.call, ptr %.loc7_21.2.temp, align 8, !dbg !13
-// CHECK:STDOUT:   %.loc7_21.4 = load ptr, ptr %.loc7_21.2.temp, align 8, !dbg !13
-// CHECK:STDOUT:   call void @_Z13take_void_ptrPv(ptr %.loc7_21.4), !dbg !14
-// CHECK:STDOUT:   ret void, !dbg !15
+// CHECK:STDOUT:   %.loc7_21.2.temp = alloca ptr, align 8, !dbg !18
+// CHECK:STDOUT:   %U.binding.as_type.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.e5cf8fcbb4feaae2:ImplicitAs.0f95c9e18c91e00a.Core.5c62f2dbad753cd9"(ptr %a), !dbg !18
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc7_21.2.temp), !dbg !18
+// CHECK:STDOUT:   store ptr %U.binding.as_type.as.ImplicitAs.impl.Convert.call, ptr %.loc7_21.2.temp, align 8, !dbg !18
+// CHECK:STDOUT:   %.loc7_21.4 = load ptr, ptr %.loc7_21.2.temp, align 8, !dbg !18
+// CHECK:STDOUT:   call void @_Z13take_void_ptrPv(ptr %.loc7_21.4), !dbg !19
+// CHECK:STDOUT:   ret void, !dbg !20
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: declare void @_Z13take_void_ptrPv(ptr)
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CPassIntPtr.Main(ptr %a) #0 !dbg !16 {
+// CHECK:STDOUT: define void @_CPassIntPtr.Main(ptr %a) #0 !dbg !21 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc11_21.2.temp = alloca ptr, align 8, !dbg !19
-// CHECK:STDOUT:   %U.binding.as_type.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.e5cf8fcbb4feaae2:ImplicitAs.0f95c9e18c91e00a.Core.63e244d930b21b2a"(ptr %a), !dbg !19
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc11_21.2.temp), !dbg !19
-// CHECK:STDOUT:   store ptr %U.binding.as_type.as.ImplicitAs.impl.Convert.call, ptr %.loc11_21.2.temp, align 8, !dbg !19
-// CHECK:STDOUT:   %.loc11_21.4 = load ptr, ptr %.loc11_21.2.temp, align 8, !dbg !19
-// CHECK:STDOUT:   call void @_Z13take_void_ptrPv(ptr %.loc11_21.4), !dbg !20
-// CHECK:STDOUT:   ret void, !dbg !21
+// CHECK:STDOUT:   %.loc11_21.2.temp = alloca ptr, align 8, !dbg !24
+// CHECK:STDOUT:   %U.binding.as_type.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.e5cf8fcbb4feaae2:ImplicitAs.0f95c9e18c91e00a.Core.63e244d930b21b2a"(ptr %a), !dbg !24
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc11_21.2.temp), !dbg !24
+// CHECK:STDOUT:   store ptr %U.binding.as_type.as.ImplicitAs.impl.Convert.call, ptr %.loc11_21.2.temp, align 8, !dbg !24
+// CHECK:STDOUT:   %.loc11_21.4 = load ptr, ptr %.loc11_21.2.temp, align 8, !dbg !24
+// CHECK:STDOUT:   call void @_Z13take_void_ptrPv(ptr %.loc11_21.4), !dbg !25
+// CHECK:STDOUT:   ret void, !dbg !26
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CPassIntPtrToConstVoidPtr.Main(ptr %a) #0 !dbg !22 {
+// CHECK:STDOUT: define void @_CPassIntPtrToConstVoidPtr.Main(ptr %a) #0 !dbg !27 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc15_27.2.temp = alloca ptr, align 8, !dbg !25
-// CHECK:STDOUT:   %U.binding.as_type.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.e5cf8fcbb4feaae2:ImplicitAs.0f95c9e18c91e00a.Core.3fcbaa3d70c86d44"(ptr %a), !dbg !25
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc15_27.2.temp), !dbg !25
-// CHECK:STDOUT:   store ptr %U.binding.as_type.as.ImplicitAs.impl.Convert.call, ptr %.loc15_27.2.temp, align 8, !dbg !25
-// CHECK:STDOUT:   %.loc15_27.4 = load ptr, ptr %.loc15_27.2.temp, align 8, !dbg !25
-// CHECK:STDOUT:   call void @_Z19take_const_void_ptrPKv(ptr %.loc15_27.4), !dbg !26
-// CHECK:STDOUT:   ret void, !dbg !27
+// CHECK:STDOUT:   %.loc15_27.2.temp = alloca ptr, align 8, !dbg !30
+// CHECK:STDOUT:   %U.binding.as_type.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.e5cf8fcbb4feaae2:ImplicitAs.0f95c9e18c91e00a.Core.3fcbaa3d70c86d44"(ptr %a), !dbg !30
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc15_27.2.temp), !dbg !30
+// CHECK:STDOUT:   store ptr %U.binding.as_type.as.ImplicitAs.impl.Convert.call, ptr %.loc15_27.2.temp, align 8, !dbg !30
+// CHECK:STDOUT:   %.loc15_27.4 = load ptr, ptr %.loc15_27.2.temp, align 8, !dbg !30
+// CHECK:STDOUT:   call void @_Z19take_const_void_ptrPKv(ptr %.loc15_27.4), !dbg !31
+// CHECK:STDOUT:   ret void, !dbg !32
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: declare void @_Z19take_const_void_ptrPKv(ptr)
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define void @_CPassConstIntPtrToConstVoidPtr.Main(ptr %a) #0 !dbg !28 {
+// CHECK:STDOUT: define void @_CPassConstIntPtrToConstVoidPtr.Main(ptr %a) #0 !dbg !33 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %.loc19_27.2.temp = alloca ptr, align 8, !dbg !31
-// CHECK:STDOUT:   %U.binding.as_type.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.e5cf8fcbb4feaae2:ImplicitAs.0f95c9e18c91e00a.Core.3fcbaa3d70c86d44"(ptr %a), !dbg !31
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc19_27.2.temp), !dbg !31
-// CHECK:STDOUT:   store ptr %U.binding.as_type.as.ImplicitAs.impl.Convert.call, ptr %.loc19_27.2.temp, align 8, !dbg !31
-// CHECK:STDOUT:   %.loc19_27.4 = load ptr, ptr %.loc19_27.2.temp, align 8, !dbg !31
-// CHECK:STDOUT:   call void @_Z19take_const_void_ptrPKv(ptr %.loc19_27.4), !dbg !32
-// CHECK:STDOUT:   ret void, !dbg !33
+// CHECK:STDOUT:   %.loc19_27.2.temp = alloca ptr, align 8, !dbg !36
+// CHECK:STDOUT:   %U.binding.as_type.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.e5cf8fcbb4feaae2:ImplicitAs.0f95c9e18c91e00a.Core.3fcbaa3d70c86d44"(ptr %a), !dbg !36
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc19_27.2.temp), !dbg !36
+// CHECK:STDOUT:   store ptr %U.binding.as_type.as.ImplicitAs.impl.Convert.call, ptr %.loc19_27.2.temp, align 8, !dbg !36
+// CHECK:STDOUT:   %.loc19_27.4 = load ptr, ptr %.loc19_27.2.temp, align 8, !dbg !36
+// CHECK:STDOUT:   call void @_Z19take_const_void_ptrPKv(ptr %.loc19_27.4), !dbg !37
+// CHECK:STDOUT:   ret void, !dbg !38
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define linkonce_odr ptr @"_CConvert.e5cf8fcbb4feaae2:ImplicitAs.0f95c9e18c91e00a.Core.5c62f2dbad753cd9"(ptr %self) #0 !dbg !34 {
-// CHECK:STDOUT:   %1 = call ptr @"_CConvert.90961d7b1ce4f089:OptionalAs.0e326e799dad0c64.Core.d2075df181ac34c1"(ptr %self), !dbg !40
-// CHECK:STDOUT:   ret ptr %1, !dbg !41
+// CHECK:STDOUT: define linkonce_odr ptr @"_CConvert.e5cf8fcbb4feaae2:ImplicitAs.0f95c9e18c91e00a.Core.5c62f2dbad753cd9"(ptr %self) #0 !dbg !39 {
+// CHECK:STDOUT:   %1 = call ptr @"_CConvert.90961d7b1ce4f089:OptionalAs.0e326e799dad0c64.Core.d2075df181ac34c1"(ptr %self), !dbg !45
+// CHECK:STDOUT:   ret ptr %1, !dbg !46
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
 // CHECK:STDOUT: declare void @llvm.lifetime.start.p0(ptr captures(none)) #1
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define linkonce_odr ptr @"_CConvert.e5cf8fcbb4feaae2:ImplicitAs.0f95c9e18c91e00a.Core.63e244d930b21b2a"(ptr %self) #0 !dbg !42 {
-// CHECK:STDOUT:   %1 = call ptr @"_CConvert.3667eb502d1ddfa9:OptionalAs.c7a50af9bdd61b43.Core.599fcf6815ccd825"(ptr %self), !dbg !45
-// CHECK:STDOUT:   ret ptr %1, !dbg !46
-// CHECK:STDOUT: }
-// CHECK:STDOUT:
-// CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define linkonce_odr ptr @"_CConvert.e5cf8fcbb4feaae2:ImplicitAs.0f95c9e18c91e00a.Core.3fcbaa3d70c86d44"(ptr %self) #0 !dbg !47 {
-// CHECK:STDOUT:   %1 = call ptr @"_CConvert.3667eb502d1ddfa9:OptionalAs.c7a50af9bdd61b43.Core.40332936f52138f0"(ptr %self), !dbg !50
+// CHECK:STDOUT: define linkonce_odr ptr @"_CConvert.e5cf8fcbb4feaae2:ImplicitAs.0f95c9e18c91e00a.Core.63e244d930b21b2a"(ptr %self) #0 !dbg !47 {
+// CHECK:STDOUT:   %1 = call ptr @"_CConvert.3667eb502d1ddfa9:OptionalAs.c7a50af9bdd61b43.Core.599fcf6815ccd825"(ptr %self), !dbg !50
 // CHECK:STDOUT:   ret ptr %1, !dbg !51
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define linkonce_odr ptr @"_CConvert.90961d7b1ce4f089:OptionalAs.0e326e799dad0c64.Core.d2075df181ac34c1"(ptr %self) #0 !dbg !52 {
-// CHECK:STDOUT:   %1 = call ptr @_CSome.Optional.Core.d2075df181ac34c1(ptr %self), !dbg !55
+// CHECK:STDOUT: define linkonce_odr ptr @"_CConvert.e5cf8fcbb4feaae2:ImplicitAs.0f95c9e18c91e00a.Core.3fcbaa3d70c86d44"(ptr %self) #0 !dbg !52 {
+// CHECK:STDOUT:   %1 = call ptr @"_CConvert.3667eb502d1ddfa9:OptionalAs.c7a50af9bdd61b43.Core.40332936f52138f0"(ptr %self), !dbg !55
 // CHECK:STDOUT:   ret ptr %1, !dbg !56
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define linkonce_odr ptr @"_CConvert.3667eb502d1ddfa9:OptionalAs.c7a50af9bdd61b43.Core.599fcf6815ccd825"(ptr %self) #0 !dbg !57 {
-// CHECK:STDOUT:   %temp = alloca ptr, align 8, !dbg !60
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %temp), !dbg !60
-// CHECK:STDOUT:   store ptr %self, ptr %temp, align 8, !dbg !60
-// CHECK:STDOUT:   %1 = load ptr, ptr %temp, align 8, !dbg !60
-// CHECK:STDOUT:   %2 = call ptr @_CSome.Optional.Core.d2075df181ac34c1(ptr %1), !dbg !61
-// CHECK:STDOUT:   ret ptr %2, !dbg !62
+// CHECK:STDOUT: define linkonce_odr ptr @"_CConvert.90961d7b1ce4f089:OptionalAs.0e326e799dad0c64.Core.d2075df181ac34c1"(ptr %self) #0 !dbg !57 {
+// CHECK:STDOUT:   %1 = call ptr @_CSome.Optional.Core.d2075df181ac34c1(ptr %self), !dbg !60
+// CHECK:STDOUT:   ret ptr %1, !dbg !61
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define linkonce_odr ptr @"_CConvert.3667eb502d1ddfa9:OptionalAs.c7a50af9bdd61b43.Core.40332936f52138f0"(ptr %self) #0 !dbg !63 {
-// CHECK:STDOUT:   %temp = alloca ptr, align 8, !dbg !66
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %temp), !dbg !66
-// CHECK:STDOUT:   %1 = call ptr @"_CConvert:thunk.e8f8f92d3d08d149:ImplicitAs.ffd58aeb29886b72.Core.b88d1103f417c6d4"(ptr %self), !dbg !66
-// CHECK:STDOUT:   store ptr %1, ptr %temp, align 8, !dbg !66
-// CHECK:STDOUT:   %2 = load ptr, ptr %temp, align 8, !dbg !66
-// CHECK:STDOUT:   %3 = call ptr @_CSome.Optional.Core.d2075df181ac34c1(ptr %2), !dbg !67
-// CHECK:STDOUT:   ret ptr %3, !dbg !68
+// CHECK:STDOUT: define linkonce_odr ptr @"_CConvert.3667eb502d1ddfa9:OptionalAs.c7a50af9bdd61b43.Core.599fcf6815ccd825"(ptr %self) #0 !dbg !62 {
+// CHECK:STDOUT:   %temp = alloca ptr, align 8, !dbg !65
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %temp), !dbg !65
+// CHECK:STDOUT:   store ptr %self, ptr %temp, align 8, !dbg !65
+// CHECK:STDOUT:   %1 = load ptr, ptr %temp, align 8, !dbg !65
+// CHECK:STDOUT:   %2 = call ptr @_CSome.Optional.Core.d2075df181ac34c1(ptr %1), !dbg !66
+// CHECK:STDOUT:   ret ptr %2, !dbg !67
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define linkonce_odr ptr @_CSome.Optional.Core.d2075df181ac34c1(ptr %value) #0 !dbg !69 {
-// CHECK:STDOUT:   %1 = call ptr @"_CSome.e8f8f92d3d08d149:OptionalStorage.Core.a3238f3d1f6ba299"(ptr %value), !dbg !72
-// CHECK:STDOUT:   ret ptr %1, !dbg !73
+// CHECK:STDOUT: define linkonce_odr ptr @"_CConvert.3667eb502d1ddfa9:OptionalAs.c7a50af9bdd61b43.Core.40332936f52138f0"(ptr %self) #0 !dbg !68 {
+// CHECK:STDOUT:   %temp = alloca ptr, align 8, !dbg !71
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %temp), !dbg !71
+// CHECK:STDOUT:   %1 = call ptr @"_CConvert:thunk.e8f8f92d3d08d149:ImplicitAs.ffd58aeb29886b72.Core.b88d1103f417c6d4"(ptr %self), !dbg !71
+// CHECK:STDOUT:   store ptr %1, ptr %temp, align 8, !dbg !71
+// CHECK:STDOUT:   %2 = load ptr, ptr %temp, align 8, !dbg !71
+// CHECK:STDOUT:   %3 = call ptr @_CSome.Optional.Core.d2075df181ac34c1(ptr %2), !dbg !72
+// CHECK:STDOUT:   ret ptr %3, !dbg !73
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: ; Function Attrs: nounwind
+// CHECK:STDOUT: define linkonce_odr ptr @_CSome.Optional.Core.d2075df181ac34c1(ptr %value) #0 !dbg !74 {
+// CHECK:STDOUT:   %1 = call ptr @"_CSome.e8f8f92d3d08d149:OptionalStorage.Core.a3238f3d1f6ba299"(ptr %value), !dbg !77
+// CHECK:STDOUT:   ret ptr %1, !dbg !78
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: alwaysinline nounwind
-// CHECK:STDOUT: define linkonce_odr ptr @"_CConvert:thunk.e8f8f92d3d08d149:ImplicitAs.ffd58aeb29886b72.Core.b88d1103f417c6d4"(ptr %self) #2 !dbg !74 {
-// CHECK:STDOUT:   ret ptr %self, !dbg !78
+// CHECK:STDOUT: define linkonce_odr ptr @"_CConvert:thunk.e8f8f92d3d08d149:ImplicitAs.ffd58aeb29886b72.Core.b88d1103f417c6d4"(ptr %self) #2 !dbg !79 {
+// CHECK:STDOUT:   ret ptr %self, !dbg !83
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define linkonce_odr ptr @"_CSome.e8f8f92d3d08d149:OptionalStorage.Core.a3238f3d1f6ba299"(ptr %self) #0 !dbg !79 {
-// CHECK:STDOUT:   %1 = alloca ptr, align 8, !dbg !82
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %1), !dbg !82
-// CHECK:STDOUT:   store ptr %self, ptr %1, align 8, !dbg !83
-// CHECK:STDOUT:   %2 = load ptr, ptr %1, align 8, !dbg !84
-// CHECK:STDOUT:   ret ptr %2, !dbg !85
+// CHECK:STDOUT: define linkonce_odr ptr @"_CSome.e8f8f92d3d08d149:OptionalStorage.Core.a3238f3d1f6ba299"(ptr %self) #0 !dbg !84 {
+// CHECK:STDOUT:   %1 = alloca ptr, align 8, !dbg !87
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %1), !dbg !87
+// CHECK:STDOUT:   store ptr %self, ptr %1, align 8, !dbg !88
+// CHECK:STDOUT:   %2 = load ptr, ptr %1, align 8, !dbg !89
+// CHECK:STDOUT:   ret ptr %2, !dbg !90
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; uselistorder directives
@@ -190,146 +190,158 @@ fn ConvertFromConstVoidPtr(p: const Cpp.void*) -> const i32* {
 // CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
 // CHECK:STDOUT: attributes #2 = { alwaysinline nounwind }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "pass.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "PassVoidPtr", linkageName: "_CPassVoidPtr.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !11)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{null, !10}
-// CHECK:STDOUT: !10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
-// CHECK:STDOUT: !11 = !{!12}
-// CHECK:STDOUT: !12 = !DILocalVariable(arg: 1, scope: !7, type: !10)
-// CHECK:STDOUT: !13 = !DILocation(line: 7, column: 21, scope: !7)
-// CHECK:STDOUT: !14 = !DILocation(line: 7, column: 3, scope: !7)
-// CHECK:STDOUT: !15 = !DILocation(line: 6, column: 1, scope: !7)
-// CHECK:STDOUT: !16 = distinct !DISubprogram(name: "PassIntPtr", linkageName: "_CPassIntPtr.Main", scope: null, file: !6, line: 10, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !17)
-// CHECK:STDOUT: !17 = !{!18}
-// CHECK:STDOUT: !18 = !DILocalVariable(arg: 1, scope: !16, type: !10)
-// CHECK:STDOUT: !19 = !DILocation(line: 11, column: 21, scope: !16)
-// CHECK:STDOUT: !20 = !DILocation(line: 11, column: 3, scope: !16)
-// CHECK:STDOUT: !21 = !DILocation(line: 10, column: 1, scope: !16)
-// CHECK:STDOUT: !22 = distinct !DISubprogram(name: "PassIntPtrToConstVoidPtr", linkageName: "_CPassIntPtrToConstVoidPtr.Main", scope: null, file: !6, line: 14, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !23)
-// CHECK:STDOUT: !23 = !{!24}
-// CHECK:STDOUT: !24 = !DILocalVariable(arg: 1, scope: !22, type: !10)
-// CHECK:STDOUT: !25 = !DILocation(line: 15, column: 27, scope: !22)
-// CHECK:STDOUT: !26 = !DILocation(line: 15, column: 3, scope: !22)
-// CHECK:STDOUT: !27 = !DILocation(line: 14, column: 1, scope: !22)
-// CHECK:STDOUT: !28 = distinct !DISubprogram(name: "PassConstIntPtrToConstVoidPtr", linkageName: "_CPassConstIntPtrToConstVoidPtr.Main", scope: null, file: !6, line: 18, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !29)
-// CHECK:STDOUT: !29 = !{!30}
-// CHECK:STDOUT: !30 = !DILocalVariable(arg: 1, scope: !28, type: !10)
-// CHECK:STDOUT: !31 = !DILocation(line: 19, column: 27, scope: !28)
-// CHECK:STDOUT: !32 = !DILocation(line: 19, column: 3, scope: !28)
-// CHECK:STDOUT: !33 = !DILocation(line: 18, column: 1, scope: !28)
-// CHECK:STDOUT: !34 = distinct !DISubprogram(name: "Convert", linkageName: "_CConvert.e5cf8fcbb4feaae2:ImplicitAs.0f95c9e18c91e00a.Core.5c62f2dbad753cd9", scope: null, file: !35, line: 93, type: !36, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !38)
-// CHECK:STDOUT: !35 = !DIFile(filename: "{{.*}}/prelude/types/optional.carbon", directory: "")
-// CHECK:STDOUT: !36 = !DISubroutineType(types: !37)
-// CHECK:STDOUT: !37 = !{!10, !10}
-// CHECK:STDOUT: !38 = !{!39}
-// CHECK:STDOUT: !39 = !DILocalVariable(arg: 1, scope: !34, type: !10)
-// CHECK:STDOUT: !40 = !DILocation(line: 94, column: 12, scope: !34)
-// CHECK:STDOUT: !41 = !DILocation(line: 94, column: 5, scope: !34)
-// CHECK:STDOUT: !42 = distinct !DISubprogram(name: "Convert", linkageName: "_CConvert.e5cf8fcbb4feaae2:ImplicitAs.0f95c9e18c91e00a.Core.63e244d930b21b2a", scope: null, file: !35, line: 93, type: !36, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !43)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "pass.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "PassVoidPtr", linkageName: "_CPassVoidPtr.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !16)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{null, !15}
+// CHECK:STDOUT: !15 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
+// CHECK:STDOUT: !16 = !{!17}
+// CHECK:STDOUT: !17 = !DILocalVariable(arg: 1, scope: !12, type: !15)
+// CHECK:STDOUT: !18 = !DILocation(line: 7, column: 21, scope: !12)
+// CHECK:STDOUT: !19 = !DILocation(line: 7, column: 3, scope: !12)
+// CHECK:STDOUT: !20 = !DILocation(line: 6, column: 1, scope: !12)
+// CHECK:STDOUT: !21 = distinct !DISubprogram(name: "PassIntPtr", linkageName: "_CPassIntPtr.Main", scope: null, file: !7, line: 10, type: !13, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !22)
+// CHECK:STDOUT: !22 = !{!23}
+// CHECK:STDOUT: !23 = !DILocalVariable(arg: 1, scope: !21, type: !15)
+// CHECK:STDOUT: !24 = !DILocation(line: 11, column: 21, scope: !21)
+// CHECK:STDOUT: !25 = !DILocation(line: 11, column: 3, scope: !21)
+// CHECK:STDOUT: !26 = !DILocation(line: 10, column: 1, scope: !21)
+// CHECK:STDOUT: !27 = distinct !DISubprogram(name: "PassIntPtrToConstVoidPtr", linkageName: "_CPassIntPtrToConstVoidPtr.Main", scope: null, file: !7, line: 14, type: !13, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !28)
+// CHECK:STDOUT: !28 = !{!29}
+// CHECK:STDOUT: !29 = !DILocalVariable(arg: 1, scope: !27, type: !15)
+// CHECK:STDOUT: !30 = !DILocation(line: 15, column: 27, scope: !27)
+// CHECK:STDOUT: !31 = !DILocation(line: 15, column: 3, scope: !27)
+// CHECK:STDOUT: !32 = !DILocation(line: 14, column: 1, scope: !27)
+// CHECK:STDOUT: !33 = distinct !DISubprogram(name: "PassConstIntPtrToConstVoidPtr", linkageName: "_CPassConstIntPtrToConstVoidPtr.Main", scope: null, file: !7, line: 18, type: !13, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !34)
+// CHECK:STDOUT: !34 = !{!35}
+// CHECK:STDOUT: !35 = !DILocalVariable(arg: 1, scope: !33, type: !15)
+// CHECK:STDOUT: !36 = !DILocation(line: 19, column: 27, scope: !33)
+// CHECK:STDOUT: !37 = !DILocation(line: 19, column: 3, scope: !33)
+// CHECK:STDOUT: !38 = !DILocation(line: 18, column: 1, scope: !33)
+// CHECK:STDOUT: !39 = distinct !DISubprogram(name: "Convert", linkageName: "_CConvert.e5cf8fcbb4feaae2:ImplicitAs.0f95c9e18c91e00a.Core.5c62f2dbad753cd9", scope: null, file: !40, line: 93, type: !41, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !43)
+// CHECK:STDOUT: !40 = !DIFile(filename: "{{.*}}/prelude/types/optional.carbon", directory: "")
+// CHECK:STDOUT: !41 = !DISubroutineType(types: !42)
+// CHECK:STDOUT: !42 = !{!15, !15}
 // CHECK:STDOUT: !43 = !{!44}
-// CHECK:STDOUT: !44 = !DILocalVariable(arg: 1, scope: !42, type: !10)
-// CHECK:STDOUT: !45 = !DILocation(line: 94, column: 12, scope: !42)
-// CHECK:STDOUT: !46 = !DILocation(line: 94, column: 5, scope: !42)
-// CHECK:STDOUT: !47 = distinct !DISubprogram(name: "Convert", linkageName: "_CConvert.e5cf8fcbb4feaae2:ImplicitAs.0f95c9e18c91e00a.Core.3fcbaa3d70c86d44", scope: null, file: !35, line: 93, type: !36, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !48)
+// CHECK:STDOUT: !44 = !DILocalVariable(arg: 1, scope: !39, type: !15)
+// CHECK:STDOUT: !45 = !DILocation(line: 94, column: 12, scope: !39)
+// CHECK:STDOUT: !46 = !DILocation(line: 94, column: 5, scope: !39)
+// CHECK:STDOUT: !47 = distinct !DISubprogram(name: "Convert", linkageName: "_CConvert.e5cf8fcbb4feaae2:ImplicitAs.0f95c9e18c91e00a.Core.63e244d930b21b2a", scope: null, file: !40, line: 93, type: !41, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !48)
 // CHECK:STDOUT: !48 = !{!49}
-// CHECK:STDOUT: !49 = !DILocalVariable(arg: 1, scope: !47, type: !10)
+// CHECK:STDOUT: !49 = !DILocalVariable(arg: 1, scope: !47, type: !15)
 // CHECK:STDOUT: !50 = !DILocation(line: 94, column: 12, scope: !47)
 // CHECK:STDOUT: !51 = !DILocation(line: 94, column: 5, scope: !47)
-// CHECK:STDOUT: !52 = distinct !DISubprogram(name: "Convert", linkageName: "_CConvert.90961d7b1ce4f089:OptionalAs.0e326e799dad0c64.Core.d2075df181ac34c1", scope: null, file: !35, line: 68, type: !36, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !53)
+// CHECK:STDOUT: !52 = distinct !DISubprogram(name: "Convert", linkageName: "_CConvert.e5cf8fcbb4feaae2:ImplicitAs.0f95c9e18c91e00a.Core.3fcbaa3d70c86d44", scope: null, file: !40, line: 93, type: !41, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !53)
 // CHECK:STDOUT: !53 = !{!54}
-// CHECK:STDOUT: !54 = !DILocalVariable(arg: 1, scope: !52, type: !10)
-// CHECK:STDOUT: !55 = !DILocation(line: 69, column: 12, scope: !52)
-// CHECK:STDOUT: !56 = !DILocation(line: 69, column: 5, scope: !52)
-// CHECK:STDOUT: !57 = distinct !DISubprogram(name: "Convert", linkageName: "_CConvert.3667eb502d1ddfa9:OptionalAs.c7a50af9bdd61b43.Core.599fcf6815ccd825", scope: null, file: !35, line: 75, type: !36, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !58)
+// CHECK:STDOUT: !54 = !DILocalVariable(arg: 1, scope: !52, type: !15)
+// CHECK:STDOUT: !55 = !DILocation(line: 94, column: 12, scope: !52)
+// CHECK:STDOUT: !56 = !DILocation(line: 94, column: 5, scope: !52)
+// CHECK:STDOUT: !57 = distinct !DISubprogram(name: "Convert", linkageName: "_CConvert.90961d7b1ce4f089:OptionalAs.0e326e799dad0c64.Core.d2075df181ac34c1", scope: null, file: !40, line: 68, type: !41, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !58)
 // CHECK:STDOUT: !58 = !{!59}
-// CHECK:STDOUT: !59 = !DILocalVariable(arg: 1, scope: !57, type: !10)
-// CHECK:STDOUT: !60 = !DILocation(line: 76, column: 29, scope: !57)
-// CHECK:STDOUT: !61 = !DILocation(line: 76, column: 12, scope: !57)
-// CHECK:STDOUT: !62 = !DILocation(line: 76, column: 5, scope: !57)
-// CHECK:STDOUT: !63 = distinct !DISubprogram(name: "Convert", linkageName: "_CConvert.3667eb502d1ddfa9:OptionalAs.c7a50af9bdd61b43.Core.40332936f52138f0", scope: null, file: !35, line: 75, type: !36, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !64)
-// CHECK:STDOUT: !64 = !{!65}
-// CHECK:STDOUT: !65 = !DILocalVariable(arg: 1, scope: !63, type: !10)
-// CHECK:STDOUT: !66 = !DILocation(line: 76, column: 29, scope: !63)
-// CHECK:STDOUT: !67 = !DILocation(line: 76, column: 12, scope: !63)
-// CHECK:STDOUT: !68 = !DILocation(line: 76, column: 5, scope: !63)
-// CHECK:STDOUT: !69 = distinct !DISubprogram(name: "Some", linkageName: "_CSome.Optional.Core.d2075df181ac34c1", scope: null, file: !35, line: 29, type: !36, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !70)
-// CHECK:STDOUT: !70 = !{!71}
-// CHECK:STDOUT: !71 = !DILocalVariable(arg: 1, scope: !69, type: !10)
-// CHECK:STDOUT: !72 = !DILocation(line: 30, column: 12, scope: !69)
-// CHECK:STDOUT: !73 = !DILocation(line: 30, column: 5, scope: !69)
-// CHECK:STDOUT: !74 = distinct !DISubprogram(name: "Convert", linkageName: "_CConvert:thunk.e8f8f92d3d08d149:ImplicitAs.ffd58aeb29886b72.Core.b88d1103f417c6d4", scope: null, file: !75, line: 40, type: !36, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !76)
-// CHECK:STDOUT: !75 = !DIFile(filename: "{{.*}}/prelude/types/cpp/void.carbon", directory: "")
-// CHECK:STDOUT: !76 = !{!77}
-// CHECK:STDOUT: !77 = !DILocalVariable(arg: 1, scope: !74, type: !10)
-// CHECK:STDOUT: !78 = !DILocation(line: 40, column: 3, scope: !74)
-// CHECK:STDOUT: !79 = distinct !DISubprogram(name: "Some", linkageName: "_CSome.e8f8f92d3d08d149:OptionalStorage.Core.a3238f3d1f6ba299", scope: null, file: !35, line: 138, type: !36, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !80)
-// CHECK:STDOUT: !80 = !{!81}
-// CHECK:STDOUT: !81 = !DILocalVariable(arg: 1, scope: !79, type: !10)
-// CHECK:STDOUT: !82 = !DILocation(line: 139, column: 14, scope: !79)
-// CHECK:STDOUT: !83 = !DILocation(line: 140, column: 5, scope: !79)
-// CHECK:STDOUT: !84 = !DILocation(line: 139, column: 18, scope: !79)
-// CHECK:STDOUT: !85 = !DILocation(line: 141, column: 5, scope: !79)
+// CHECK:STDOUT: !59 = !DILocalVariable(arg: 1, scope: !57, type: !15)
+// CHECK:STDOUT: !60 = !DILocation(line: 69, column: 12, scope: !57)
+// CHECK:STDOUT: !61 = !DILocation(line: 69, column: 5, scope: !57)
+// CHECK:STDOUT: !62 = distinct !DISubprogram(name: "Convert", linkageName: "_CConvert.3667eb502d1ddfa9:OptionalAs.c7a50af9bdd61b43.Core.599fcf6815ccd825", scope: null, file: !40, line: 75, type: !41, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !63)
+// CHECK:STDOUT: !63 = !{!64}
+// CHECK:STDOUT: !64 = !DILocalVariable(arg: 1, scope: !62, type: !15)
+// CHECK:STDOUT: !65 = !DILocation(line: 76, column: 29, scope: !62)
+// CHECK:STDOUT: !66 = !DILocation(line: 76, column: 12, scope: !62)
+// CHECK:STDOUT: !67 = !DILocation(line: 76, column: 5, scope: !62)
+// CHECK:STDOUT: !68 = distinct !DISubprogram(name: "Convert", linkageName: "_CConvert.3667eb502d1ddfa9:OptionalAs.c7a50af9bdd61b43.Core.40332936f52138f0", scope: null, file: !40, line: 75, type: !41, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !69)
+// CHECK:STDOUT: !69 = !{!70}
+// CHECK:STDOUT: !70 = !DILocalVariable(arg: 1, scope: !68, type: !15)
+// CHECK:STDOUT: !71 = !DILocation(line: 76, column: 29, scope: !68)
+// CHECK:STDOUT: !72 = !DILocation(line: 76, column: 12, scope: !68)
+// CHECK:STDOUT: !73 = !DILocation(line: 76, column: 5, scope: !68)
+// CHECK:STDOUT: !74 = distinct !DISubprogram(name: "Some", linkageName: "_CSome.Optional.Core.d2075df181ac34c1", scope: null, file: !40, line: 29, type: !41, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !75)
+// CHECK:STDOUT: !75 = !{!76}
+// CHECK:STDOUT: !76 = !DILocalVariable(arg: 1, scope: !74, type: !15)
+// CHECK:STDOUT: !77 = !DILocation(line: 30, column: 12, scope: !74)
+// CHECK:STDOUT: !78 = !DILocation(line: 30, column: 5, scope: !74)
+// CHECK:STDOUT: !79 = distinct !DISubprogram(name: "Convert", linkageName: "_CConvert:thunk.e8f8f92d3d08d149:ImplicitAs.ffd58aeb29886b72.Core.b88d1103f417c6d4", scope: null, file: !80, line: 40, type: !41, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !81)
+// CHECK:STDOUT: !80 = !DIFile(filename: "{{.*}}/prelude/types/cpp/void.carbon", directory: "")
+// CHECK:STDOUT: !81 = !{!82}
+// CHECK:STDOUT: !82 = !DILocalVariable(arg: 1, scope: !79, type: !15)
+// CHECK:STDOUT: !83 = !DILocation(line: 40, column: 3, scope: !79)
+// CHECK:STDOUT: !84 = distinct !DISubprogram(name: "Some", linkageName: "_CSome.e8f8f92d3d08d149:OptionalStorage.Core.a3238f3d1f6ba299", scope: null, file: !40, line: 138, type: !41, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !85)
+// CHECK:STDOUT: !85 = !{!86}
+// CHECK:STDOUT: !86 = !DILocalVariable(arg: 1, scope: !84, type: !15)
+// CHECK:STDOUT: !87 = !DILocation(line: 139, column: 14, scope: !84)
+// CHECK:STDOUT: !88 = !DILocation(line: 140, column: 5, scope: !84)
+// CHECK:STDOUT: !89 = !DILocation(line: 139, column: 18, scope: !84)
+// CHECK:STDOUT: !90 = !DILocation(line: 141, column: 5, scope: !84)
 // CHECK:STDOUT: ; ModuleID = 'receive.carbon'
 // CHECK:STDOUT: source_filename = "receive.carbon"
 // CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
 // CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define ptr @_CReceiveVoidPtr.Main() #0 !dbg !7 {
+// CHECK:STDOUT: define ptr @_CReceiveVoidPtr.Main() #0 !dbg !12 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %return_void_ptr.call = call ptr @_Z15return_void_ptrv(), !dbg !11
-// CHECK:STDOUT:   ret ptr %return_void_ptr.call, !dbg !12
+// CHECK:STDOUT:   %return_void_ptr.call = call ptr @_Z15return_void_ptrv(), !dbg !16
+// CHECK:STDOUT:   ret ptr %return_void_ptr.call, !dbg !17
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: declare ptr @_Z15return_void_ptrv()
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define ptr @_CConvertFromVoidPtr.Main(ptr %p) #0 !dbg !13 {
+// CHECK:STDOUT: define ptr @_CConvertFromVoidPtr.Main(ptr %p) #0 !dbg !18 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   ret ptr %p, !dbg !18
+// CHECK:STDOUT:   ret ptr %p, !dbg !23
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nounwind
-// CHECK:STDOUT: define ptr @_CConvertFromConstVoidPtr.Main(ptr %p) #0 !dbg !19 {
+// CHECK:STDOUT: define ptr @_CConvertFromConstVoidPtr.Main(ptr %p) #0 !dbg !24 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   ret ptr %p, !dbg !22
+// CHECK:STDOUT:   ret ptr %p, !dbg !27
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nounwind }
 // CHECK:STDOUT:
-// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
-// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
+// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
+// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
+// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
 // CHECK:STDOUT:
 // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
 // CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
 // CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
-// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
-// CHECK:STDOUT: !6 = !DIFile(filename: "receive.carbon", directory: "")
-// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "ReceiveVoidPtr", linkageName: "_CReceiveVoidPtr.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
-// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
-// CHECK:STDOUT: !9 = !{!10}
-// CHECK:STDOUT: !10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
-// CHECK:STDOUT: !11 = !DILocation(line: 7, column: 10, scope: !7)
-// CHECK:STDOUT: !12 = !DILocation(line: 7, column: 3, scope: !7)
-// CHECK:STDOUT: !13 = distinct !DISubprogram(name: "ConvertFromVoidPtr", linkageName: "_CConvertFromVoidPtr.Main", scope: null, file: !6, line: 10, type: !14, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !16)
-// CHECK:STDOUT: !14 = !DISubroutineType(types: !15)
-// CHECK:STDOUT: !15 = !{!10, !10}
-// CHECK:STDOUT: !16 = !{!17}
-// CHECK:STDOUT: !17 = !DILocalVariable(arg: 1, scope: !13, type: !10)
-// CHECK:STDOUT: !18 = !DILocation(line: 11, column: 3, scope: !13)
-// CHECK:STDOUT: !19 = distinct !DISubprogram(name: "ConvertFromConstVoidPtr", linkageName: "_CConvertFromConstVoidPtr.Main", scope: null, file: !6, line: 14, type: !14, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !20)
-// CHECK:STDOUT: !20 = !{!21}
-// CHECK:STDOUT: !21 = !DILocalVariable(arg: 1, scope: !19, type: !10)
-// CHECK:STDOUT: !22 = !DILocation(line: 15, column: 3, scope: !19)
+// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
+// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !7 = !DIFile(filename: "receive.carbon", directory: "")
+// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
+// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
+// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
+// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
+// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "ReceiveVoidPtr", linkageName: "_CReceiveVoidPtr.Main", scope: null, file: !7, line: 6, type: !13, spFlags: DISPFlagDefinition, unit: !6)
+// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
+// CHECK:STDOUT: !14 = !{!15}
+// CHECK:STDOUT: !15 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
+// CHECK:STDOUT: !16 = !DILocation(line: 7, column: 10, scope: !12)
+// CHECK:STDOUT: !17 = !DILocation(line: 7, column: 3, scope: !12)
+// CHECK:STDOUT: !18 = distinct !DISubprogram(name: "ConvertFromVoidPtr", linkageName: "_CConvertFromVoidPtr.Main", scope: null, file: !7, line: 10, type: !19, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !21)
+// CHECK:STDOUT: !19 = !DISubroutineType(types: !20)
+// CHECK:STDOUT: !20 = !{!15, !15}
+// CHECK:STDOUT: !21 = !{!22}
+// CHECK:STDOUT: !22 = !DILocalVariable(arg: 1, scope: !18, type: !15)
+// CHECK:STDOUT: !23 = !DILocation(line: 11, column: 3, scope: !18)
+// CHECK:STDOUT: !24 = distinct !DISubprogram(name: "ConvertFromConstVoidPtr", linkageName: "_CConvertFromConstVoidPtr.Main", scope: null, file: !7, line: 14, type: !19, spFlags: DISPFlagDefinition, unit: !6, retainedNodes: !25)
+// CHECK:STDOUT: !25 = !{!26}
+// CHECK:STDOUT: !26 = !DILocalVariable(arg: 1, scope: !24, type: !15)
+// CHECK:STDOUT: !27 = !DILocation(line: 15, column: 3, scope: !24)

toolchain/sem_ir/BUILD

@@ -70,8 +70,11 @@ cc_library(
         "//common:check",
         "@llvm-project//clang:ast",
         "@llvm-project//clang:basic",
+        "@llvm-project//clang:codegen",
         "@llvm-project//clang:frontend",
+        "@llvm-project//clang:lex",
         "@llvm-project//clang:sema",
+        "@llvm-project//llvm:Core",
         "@llvm-project//llvm:Support",
     ],
 )

toolchain/sem_ir/cpp_file.h

@@ -5,9 +5,13 @@
 #ifndef CARBON_TOOLCHAIN_SEM_IR_CPP_FILE_H_
 #define CARBON_TOOLCHAIN_SEM_IR_CPP_FILE_H_
 
+#include "clang/Basic/CodeGenOptions.h"
 #include "clang/Basic/Diagnostic.h"
+#include "clang/CodeGen/ModuleBuilder.h"
 #include "clang/Frontend/CompilerInstance.h"
+#include "clang/Lex/PreprocessorOptions.h"
 #include "llvm/ADT/IntrusiveRefCntPtr.h"
+#include "llvm/IR/Module.h"
 #include "llvm/Support/FileSystem.h"
 
 namespace Carbon::SemIR {
@@ -16,8 +20,9 @@ namespace Carbon::SemIR {
 // imported C++ headers and any inline C++ fragments.
 class CppFile {
  public:
-  explicit CppFile(std::unique_ptr<clang::CompilerInstance> clang)
-      : clang_(std::move(clang)) {}
+  explicit CppFile(std::unique_ptr<clang::CompilerInstance> clang,
+                   llvm::LLVMContext* llvm_context)
+      : clang_(std::move(clang)), llvm_context_(llvm_context) {}
 
   // Access to compilation options.
   auto diagnostic_options() const -> const clang::DiagnosticOptions& {
@@ -46,17 +51,20 @@ class CppFile {
     return clang_->getASTContext();
   }
 
-  // A list of all the top-level decl groups produced in this compilation.
-  auto decl_groups() -> llvm::SmallVector<clang::DeclGroupRef>& {
-    return decl_groups_;
+  auto llvm_context() const -> llvm::LLVMContext* { return llvm_context_; }
+  auto SetCodeGenerator(clang::CodeGenerator* code_generator) -> void {
+    code_generator_ = code_generator;
   }
-  auto decl_groups() const -> const llvm::SmallVector<clang::DeclGroupRef>& {
-    return decl_groups_;
+  auto GetCodeGenerator() const -> clang::CodeGenerator* {
+    // Clang code generation should not actually modify the AST, but isn't
+    // const-correct.
+    return code_generator_;
   }
 
  private:
   std::unique_ptr<clang::CompilerInstance> clang_;
-  llvm::SmallVector<clang::DeclGroupRef> decl_groups_;
+  llvm::LLVMContext* llvm_context_;
+  clang::CodeGenerator* code_generator_ = nullptr;
 };
 
 }  // namespace Carbon::SemIR