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aa69a484eb0774d1b00107bc145bf46c0f871256
carbon-lang/toolchain/lower/testdata/function/generic/self_canonical.carbon
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Richard SmithDana JansensChandler Carruth
 aa69a484eb Add support for running LLVM optimizer. (#6225) 
Adds a flag `--optimize=<mode>` that specifies what to optimize for:

* `--optimize=none` turns off the optimizer as much as possible, but
still respects always_inline.
* `--optimize=debug` aims to be the equivalent of `-Og` / `-O1`, and
provides optimizations that don't affect the ability to debug the
program. This is the default.
* `--optimize=size` optimizes for the size of the produced program, and
aims to be the equivalent of `-Oz`.
* `--optimize=speed` optimizes for the execution time of the produced
program, and aims to be the equivalent of `-O3`.

Following the approach taken by Clang, the optimization level feeds into
both the configuration of the LLVM pass pipeline and the attributes
added to function definitions generated by the frontend.

Optimization is performed in a new phase, `optimize`, which runs between
`lower` and `codegen`.

---------

Co-authored-by: Dana Jansens <danakj@orodu.net>
Co-authored-by: Chandler Carruth <chandlerc@gmail.com>
2025-11-05 00:15:14 +00:00

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// 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/destroy.carbon
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/lower/testdata/function/generic/self_canonical.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/function/generic/self_canonical.carbon
// In this test, specific46 becomes canonical for others. Then, specific42 is
// found to be equivalent to specific46 and it becomes its canonical.
// Then through another equivalence from other specifics that point to
// specific46, specific46 is picked as the canonical. This is fine, we keep the
// chain of equivalences and eventually this is walked to get to specific42.
// The canonical for specific46, should not be updated to self in this case.
// Test that chains of equivalances are properly maintained and walked.
class class_name1 {}
class class_name2 {}
class class_name3 {}
class class_name4 {}
class class_name5 {}
class class_name6 {}
fn third_function[T:! type, U:! type, V:! type](arg1: T, arg2: U, arg3: V);
fn fourth_function[T:! type](arg: T);
fn first_function[T:! type](arg: T);
fn second_function[T:! type, U:! type, V:! type](arg1: T, arg2: U, arg3: V);
fn third_function[T:! type, U:! type, V:! type](arg1: T, arg2: U, arg3: V) {
var local1: class_name2*;
var local2: class_name2*;
third_function(arg1, arg2, local2);
fourth_function(local1);
}
fn unused_1[T:! type, U:! type, V:! type](arg1: T, arg2: U, arg3: V) {
var local1: class_name6*;
third_function(arg1, arg3, local1);
}
fn fourth_function[T:! type](arg: T) {
var local1: class_name5**;
var local2: class_name6*;
first_function(local1);
first_function(local2);
}
fn first_function[T:! type](arg: T) {
var local1: class_name4*;
var local2: class_name3*;
second_function(local2, local1, arg);
}
fn unused_2[T:! type, U:! type](arg1: T, arg2: U) {
var local1: class_name6*;
second_function(arg1, arg2, local1);
}
fn second_function[T:! type, U:! type, V:! type](arg1: T, arg2: U, arg3: V) {
var local1: class_name3*;
var local2: class_name4*;
var local3: class_name2*;
second_function(arg3, local3, local2);
third_function(local1, arg3, arg1);
}
fn Main_method_no_template () {
var local1: class_name1*;
first_function(local1);
}
// CHECK:STDOUT: ; ModuleID = 'self_canonical.carbon'
// CHECK:STDOUT: source_filename = "self_canonical.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CMain_method_no_template.Main() #0 !dbg !4 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %local1.var = alloca ptr, align 8, !dbg !7
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %local1.var), !dbg !7
// CHECK:STDOUT: %.loc82 = load ptr, ptr %local1.var, align 8, !dbg !8
// CHECK:STDOUT: call void @_Cfirst_function.Main.308f7be7cd8574f7(ptr %.loc82), !dbg !9
// CHECK:STDOUT: ret void, !dbg !10
// 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 void @_Cfourth_function.Main.a95d5636f2d020e8(ptr %arg) #0 !dbg !11 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %local1.var = alloca ptr, align 8, !dbg !12
// CHECK:STDOUT: %local2.var = alloca ptr, align 8, !dbg !13
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %local1.var), !dbg !12
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %local2.var), !dbg !13
// CHECK:STDOUT: %.loc53 = load ptr, ptr %local1.var, align 8, !dbg !14
// CHECK:STDOUT: call void @_Cfirst_function.Main.308f7be7cd8574f7(ptr %.loc53), !dbg !15
// CHECK:STDOUT: %.loc54 = load ptr, ptr %local2.var, align 8, !dbg !16
// CHECK:STDOUT: call void @_Cfirst_function.Main.308f7be7cd8574f7(ptr %.loc54), !dbg !17
// CHECK:STDOUT: ret void, !dbg !18
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr void @_Cfirst_function.Main.308f7be7cd8574f7(ptr %arg) #0 !dbg !19 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %local1.var = alloca ptr, align 8, !dbg !20
// CHECK:STDOUT: %local2.var = alloca ptr, align 8, !dbg !21
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %local1.var), !dbg !20
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %local2.var), !dbg !21
// CHECK:STDOUT: %.loc61_19 = load ptr, ptr %local2.var, align 8, !dbg !22
// CHECK:STDOUT: %.loc61_27 = load ptr, ptr %local1.var, align 8, !dbg !23
// CHECK:STDOUT: call void @_Csecond_function.Main.6e67709fb5f3d893(ptr %.loc61_19, ptr %.loc61_27, ptr %arg), !dbg !24
// CHECK:STDOUT: ret void, !dbg !25
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr void @_Csecond_function.Main.6e67709fb5f3d893(ptr %arg1, ptr %arg2, ptr %arg3) #0 !dbg !26 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %local1.var = alloca ptr, align 8, !dbg !27
// CHECK:STDOUT: %local2.var = alloca ptr, align 8, !dbg !28
// CHECK:STDOUT: %local3.var = alloca ptr, align 8, !dbg !29
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %local1.var), !dbg !27
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %local2.var), !dbg !28
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %local3.var), !dbg !29
// CHECK:STDOUT: %.loc75_25 = load ptr, ptr %local3.var, align 8, !dbg !30
// CHECK:STDOUT: %.loc75_33 = load ptr, ptr %local2.var, align 8, !dbg !31
// CHECK:STDOUT: call void @_Csecond_function.Main.6e67709fb5f3d893(ptr %arg3, ptr %.loc75_25, ptr %.loc75_33), !dbg !32
// CHECK:STDOUT: %.loc76 = load ptr, ptr %local1.var, align 8, !dbg !33
// CHECK:STDOUT: call void @_Cthird_function.Main.bd8cd068af0bdf76(ptr %.loc76, ptr %arg3, ptr %arg1), !dbg !34
// CHECK:STDOUT: ret void, !dbg !35
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr void @_Cthird_function.Main.bd8cd068af0bdf76(ptr %arg1, ptr %arg2, ptr %arg3) #0 !dbg !36 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %local1.var = alloca ptr, align 8, !dbg !37
// CHECK:STDOUT: %local2.var = alloca ptr, align 8, !dbg !38
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %local1.var), !dbg !37
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %local2.var), !dbg !38
// CHECK:STDOUT: %.loc39 = load ptr, ptr %local2.var, align 8, !dbg !39
// CHECK:STDOUT: call void @_Cthird_function.Main.bd8cd068af0bdf76(ptr %arg1, ptr %arg2, ptr %.loc39), !dbg !40
// CHECK:STDOUT: %.loc40 = load ptr, ptr %local1.var, align 8, !dbg !41
// CHECK:STDOUT: call void @_Cfourth_function.Main.a95d5636f2d020e8(ptr %.loc40), !dbg !42
// CHECK:STDOUT: ret void, !dbg !43
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; uselistorder directives
// CHECK:STDOUT: uselistorder ptr @_Cfirst_function.Main.308f7be7cd8574f7, { 1, 2, 0 }
// CHECK:STDOUT:
// 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}
// CHECK:STDOUT: !llvm.dbg.cu = !{!2}
// CHECK:STDOUT:
// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !2 = distinct !DICompileUnit(language: DW_LANG_C, file: !3, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !3 = !DIFile(filename: "self_canonical.carbon", directory: "")
// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "Main_method_no_template", linkageName: "_CMain_method_no_template.Main", scope: null, file: !3, line: 79, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !5 = !DISubroutineType(types: !6)
// CHECK:STDOUT: !6 = !{}
// CHECK:STDOUT: !7 = !DILocation(line: 80, column: 3, scope: !4)
// CHECK:STDOUT: !8 = !DILocation(line: 82, column: 18, scope: !4)
// CHECK:STDOUT: !9 = !DILocation(line: 82, column: 3, scope: !4)
// CHECK:STDOUT: !10 = !DILocation(line: 79, column: 1, scope: !4)
// CHECK:STDOUT: !11 = distinct !DISubprogram(name: "fourth_function", linkageName: "_Cfourth_function.Main.a95d5636f2d020e8", scope: null, file: !3, line: 49, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !12 = !DILocation(line: 50, column: 3, scope: !11)
// CHECK:STDOUT: !13 = !DILocation(line: 51, column: 3, scope: !11)
// CHECK:STDOUT: !14 = !DILocation(line: 53, column: 18, scope: !11)
// CHECK:STDOUT: !15 = !DILocation(line: 53, column: 3, scope: !11)
// CHECK:STDOUT: !16 = !DILocation(line: 54, column: 18, scope: !11)
// CHECK:STDOUT: !17 = !DILocation(line: 54, column: 3, scope: !11)
// CHECK:STDOUT: !18 = !DILocation(line: 49, column: 1, scope: !11)
// CHECK:STDOUT: !19 = distinct !DISubprogram(name: "first_function", linkageName: "_Cfirst_function.Main.308f7be7cd8574f7", scope: null, file: !3, line: 57, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !20 = !DILocation(line: 58, column: 3, scope: !19)
// CHECK:STDOUT: !21 = !DILocation(line: 59, column: 3, scope: !19)
// CHECK:STDOUT: !22 = !DILocation(line: 61, column: 19, scope: !19)
// CHECK:STDOUT: !23 = !DILocation(line: 61, column: 27, scope: !19)
// CHECK:STDOUT: !24 = !DILocation(line: 61, column: 3, scope: !19)
// CHECK:STDOUT: !25 = !DILocation(line: 57, column: 1, scope: !19)
// CHECK:STDOUT: !26 = distinct !DISubprogram(name: "second_function", linkageName: "_Csecond_function.Main.6e67709fb5f3d893", scope: null, file: !3, line: 70, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !27 = !DILocation(line: 71, column: 3, scope: !26)
// CHECK:STDOUT: !28 = !DILocation(line: 72, column: 3, scope: !26)
// CHECK:STDOUT: !29 = !DILocation(line: 73, column: 3, scope: !26)
// CHECK:STDOUT: !30 = !DILocation(line: 75, column: 25, scope: !26)
// CHECK:STDOUT: !31 = !DILocation(line: 75, column: 33, scope: !26)
// CHECK:STDOUT: !32 = !DILocation(line: 75, column: 3, scope: !26)
// CHECK:STDOUT: !33 = !DILocation(line: 76, column: 18, scope: !26)
// CHECK:STDOUT: !34 = !DILocation(line: 76, column: 3, scope: !26)
// CHECK:STDOUT: !35 = !DILocation(line: 70, column: 1, scope: !26)
// CHECK:STDOUT: !36 = distinct !DISubprogram(name: "third_function", linkageName: "_Cthird_function.Main.bd8cd068af0bdf76", scope: null, file: !3, line: 35, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !37 = !DILocation(line: 36, column: 3, scope: !36)
// CHECK:STDOUT: !38 = !DILocation(line: 37, column: 3, scope: !36)
// CHECK:STDOUT: !39 = !DILocation(line: 39, column: 30, scope: !36)
// CHECK:STDOUT: !40 = !DILocation(line: 39, column: 3, scope: !36)
// CHECK:STDOUT: !41 = !DILocation(line: 40, column: 19, scope: !36)
// CHECK:STDOUT: !42 = !DILocation(line: 40, column: 3, scope: !36)
// CHECK:STDOUT: !43 = !DILocation(line: 35, column: 1, scope: !36)
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