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ba6257891e614ddfcc441d060bf6427627a3df5f
carbon-lang/toolchain/lower/testdata/function/generic/call_recursive_basic.carbon
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Geoff Romer ba6257891e Remove ValueParamPattern case from deduction (#6869) 
This case is redundant: when deducing against a runtime parameter
pattern, the type is all that matters, and the type is added to the
deduction earlier. Additionally deducing the same argument against
parameter's subpattern just creates duplicate work, because the
subpattern has the same type.
2026-03-10 21:15:38 +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/full.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/call_recursive_basic.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/function/generic/call_recursive_basic.carbon
class C {
impl as Core.Copy {
fn Op[unused self: Self]() -> Self { return {}; }
}
}
// The two specifics for recursive function F, when T is a pointer, could be
// deduplicated.
fn F[T:! Core.Copy](x: T, count: i32) -> T {
if (count > 0) {
return x;
}
return F(x, count + 1);
}
fn M() {
var n: i32 = 0;
var m: f64 = 1.0;
var ptr_i32 : i32*;
var ptr_f64 : f64*;
F(n, 0);
F(m, 0);
F(ptr_i32, 0);
F(ptr_f64, 0);
var c: C;
F(c, 0);
}
// CHECK:STDOUT: ; ModuleID = 'call_recursive_basic.carbon'
// CHECK:STDOUT: source_filename = "call_recursive_basic.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: @C.val.loc15_51 = internal constant {} zeroinitializer
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @"_COp.C.Main:Copy.Core"(ptr sret({}) %return, ptr %self) #0 !dbg !4 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @llvm.memcpy.p0.p0.i64(ptr align 1 %return, ptr align 1 @C.val.loc15_51, i64 0, i1 false), !dbg !10
// CHECK:STDOUT: ret void, !dbg !10
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CM.Main() #0 !dbg !11 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %n.var = alloca i32, align 4, !dbg !14
// CHECK:STDOUT: %m.var = alloca double, align 8, !dbg !15
// CHECK:STDOUT: %ptr_i32.var = alloca ptr, align 8, !dbg !16
// CHECK:STDOUT: %ptr_f64.var = alloca ptr, align 8, !dbg !17
// CHECK:STDOUT: %c.var = alloca {}, align 8, !dbg !18
// CHECK:STDOUT: %.loc40_9.4.temp = alloca {}, align 8, !dbg !19
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %n.var), !dbg !14
// CHECK:STDOUT: store i32 0, ptr %n.var, align 4, !dbg !14
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %m.var), !dbg !15
// CHECK:STDOUT: store double 1.000000e+00, ptr %m.var, align 8, !dbg !15
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %ptr_i32.var), !dbg !16
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %ptr_f64.var), !dbg !17
// CHECK:STDOUT: %.loc34_5 = load i32, ptr %n.var, align 4, !dbg !20
// CHECK:STDOUT: %F.call.loc34 = call i32 @_CF.Main.64ccbb8e5d9a0b8e(i32 %.loc34_5, i32 0), !dbg !21
// CHECK:STDOUT: %.loc35_5 = load double, ptr %m.var, align 8, !dbg !22
// CHECK:STDOUT: %F.call.loc35 = call double @_CF.Main.de5b400758c39a65(double %.loc35_5, i32 0), !dbg !23
// CHECK:STDOUT: %.loc36_5 = load ptr, ptr %ptr_i32.var, align 8, !dbg !24
// CHECK:STDOUT: %F.call.loc36 = call ptr @_CF.Main.779b9c0f3b54a7f8(ptr %.loc36_5, i32 0), !dbg !25
// CHECK:STDOUT: %.loc37_5 = load ptr, ptr %ptr_f64.var, align 8, !dbg !26
// CHECK:STDOUT: %F.call.loc37 = call ptr @_CF.Main.779b9c0f3b54a7f8(ptr %.loc37_5, i32 0), !dbg !27
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %c.var), !dbg !18
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc40_9.4.temp), !dbg !19
// CHECK:STDOUT: call void @_CF.Main.706e9f413f1bae3d(ptr %.loc40_9.4.temp, ptr %c.var, i32 0), !dbg !19
// CHECK:STDOUT: ret void, !dbg !28
// CHECK:STDOUT: }
// CHECK:STDOUT:
// 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) #1
// 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: nounwind
// CHECK:STDOUT: define linkonce_odr i32 @_CF.Main.64ccbb8e5d9a0b8e(i32 %x, i32 %count) #0 !dbg !29 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %Int.as.OrderedWith.impl.Greater.call = icmp sgt i32 %count, 0, !dbg !36
// CHECK:STDOUT: br i1 %Int.as.OrderedWith.impl.Greater.call, label %if.then, label %if.else, !dbg !37
// CHECK:STDOUT:
// CHECK:STDOUT: if.then: ; preds = %entry
// CHECK:STDOUT: ret i32 %x, !dbg !38
// CHECK:STDOUT:
// CHECK:STDOUT: if.else: ; preds = %entry
// CHECK:STDOUT: %Int.as.AddWith.impl.Op.call = add i32 %count, 1, !dbg !39
// CHECK:STDOUT: %F.call = call i32 @_CF.Main.64ccbb8e5d9a0b8e(i32 %x, i32 %Int.as.AddWith.impl.Op.call), !dbg !40
// CHECK:STDOUT: ret i32 %F.call, !dbg !41
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr double @_CF.Main.de5b400758c39a65(double %x, i32 %count) #0 !dbg !42 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %Int.as.OrderedWith.impl.Greater.call = icmp sgt i32 %count, 0, !dbg !48
// CHECK:STDOUT: br i1 %Int.as.OrderedWith.impl.Greater.call, label %if.then, label %if.else, !dbg !49
// CHECK:STDOUT:
// CHECK:STDOUT: if.then: ; preds = %entry
// CHECK:STDOUT: ret double %x, !dbg !50
// CHECK:STDOUT:
// CHECK:STDOUT: if.else: ; preds = %entry
// CHECK:STDOUT: %Int.as.AddWith.impl.Op.call = add i32 %count, 1, !dbg !51
// CHECK:STDOUT: %F.call = call double @_CF.Main.de5b400758c39a65(double %x, i32 %Int.as.AddWith.impl.Op.call), !dbg !52
// CHECK:STDOUT: ret double %F.call, !dbg !53
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr ptr @_CF.Main.779b9c0f3b54a7f8(ptr %x, i32 %count) #0 !dbg !54 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %Int.as.OrderedWith.impl.Greater.call = icmp sgt i32 %count, 0, !dbg !58
// CHECK:STDOUT: br i1 %Int.as.OrderedWith.impl.Greater.call, label %if.then, label %if.else, !dbg !59
// CHECK:STDOUT:
// CHECK:STDOUT: if.then: ; preds = %entry
// CHECK:STDOUT: ret ptr %x, !dbg !60
// CHECK:STDOUT:
// CHECK:STDOUT: if.else: ; preds = %entry
// CHECK:STDOUT: %Int.as.AddWith.impl.Op.call = add i32 %count, 1, !dbg !61
// CHECK:STDOUT: %F.call = call ptr @_CF.Main.779b9c0f3b54a7f8(ptr %x, i32 %Int.as.AddWith.impl.Op.call), !dbg !62
// CHECK:STDOUT: ret ptr %F.call, !dbg !63
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr void @_CF.Main.706e9f413f1bae3d(ptr sret({}) %return, ptr %x, i32 %count) #0 !dbg !64 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %Int.as.OrderedWith.impl.Greater.call = icmp sgt i32 %count, 0, !dbg !68
// CHECK:STDOUT: br i1 %Int.as.OrderedWith.impl.Greater.call, label %if.then, label %if.else, !dbg !69
// CHECK:STDOUT:
// CHECK:STDOUT: if.then: ; preds = %entry
// CHECK:STDOUT: call void @"_COp.C.Main:Copy.Core"(ptr %return, ptr %x), !dbg !70
// CHECK:STDOUT: ret void, !dbg !71
// CHECK:STDOUT:
// CHECK:STDOUT: if.else: ; preds = %entry
// CHECK:STDOUT: %Int.as.AddWith.impl.Op.call = add i32 %count, 1, !dbg !72
// CHECK:STDOUT: call void @_CF.Main.706e9f413f1bae3d(ptr %return, ptr %x, i32 %Int.as.AddWith.impl.Op.call), !dbg !73
// CHECK:STDOUT: ret void, !dbg !74
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; uselistorder directives
// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 5, 4, 3, 2, 1, 0 }
// CHECK:STDOUT: uselistorder ptr @_CF.Main.779b9c0f3b54a7f8, { 1, 2, 0 }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nounwind }
// CHECK:STDOUT: attributes #1 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
// CHECK:STDOUT: attributes #2 = { 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_plus_plus, file: !3, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !3 = !DIFile(filename: "call_recursive_basic.carbon", directory: "")
// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "Op", linkageName: "_COp.C.Main:Copy.Core", scope: null, file: !3, line: 15, type: !5, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !8)
// CHECK:STDOUT: !5 = !DISubroutineType(types: !6)
// CHECK:STDOUT: !6 = !{!7, !7}
// CHECK:STDOUT: !7 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
// CHECK:STDOUT: !8 = !{!9}
// CHECK:STDOUT: !9 = !DILocalVariable(arg: 1, scope: !4, type: !7)
// CHECK:STDOUT: !10 = !DILocation(line: 15, column: 42, scope: !4)
// CHECK:STDOUT: !11 = distinct !DISubprogram(name: "M", linkageName: "_CM.Main", scope: null, file: !3, line: 28, type: !12, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !12 = !DISubroutineType(types: !13)
// CHECK:STDOUT: !13 = !{null}
// CHECK:STDOUT: !14 = !DILocation(line: 29, column: 3, scope: !11)
// CHECK:STDOUT: !15 = !DILocation(line: 30, column: 3, scope: !11)
// CHECK:STDOUT: !16 = !DILocation(line: 31, column: 3, scope: !11)
// CHECK:STDOUT: !17 = !DILocation(line: 32, column: 3, scope: !11)
// CHECK:STDOUT: !18 = !DILocation(line: 39, column: 3, scope: !11)
// CHECK:STDOUT: !19 = !DILocation(line: 40, column: 3, scope: !11)
// CHECK:STDOUT: !20 = !DILocation(line: 34, column: 5, scope: !11)
// CHECK:STDOUT: !21 = !DILocation(line: 34, column: 3, scope: !11)
// CHECK:STDOUT: !22 = !DILocation(line: 35, column: 5, scope: !11)
// CHECK:STDOUT: !23 = !DILocation(line: 35, column: 3, scope: !11)
// CHECK:STDOUT: !24 = !DILocation(line: 36, column: 5, scope: !11)
// CHECK:STDOUT: !25 = !DILocation(line: 36, column: 3, scope: !11)
// CHECK:STDOUT: !26 = !DILocation(line: 37, column: 5, scope: !11)
// CHECK:STDOUT: !27 = !DILocation(line: 37, column: 3, scope: !11)
// CHECK:STDOUT: !28 = !DILocation(line: 28, column: 1, scope: !11)
// CHECK:STDOUT: !29 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main.64ccbb8e5d9a0b8e", scope: null, file: !3, line: 21, type: !30, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !33)
// CHECK:STDOUT: !30 = !DISubroutineType(types: !31)
// CHECK:STDOUT: !31 = !{!32, !32, !32}
// CHECK:STDOUT: !32 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
// CHECK:STDOUT: !33 = !{!34, !35}
// CHECK:STDOUT: !34 = !DILocalVariable(arg: 1, scope: !29, type: !32)
// CHECK:STDOUT: !35 = !DILocalVariable(arg: 2, scope: !29, type: !32)
// CHECK:STDOUT: !36 = !DILocation(line: 22, column: 7, scope: !29)
// CHECK:STDOUT: !37 = !DILocation(line: 22, column: 6, scope: !29)
// CHECK:STDOUT: !38 = !DILocation(line: 23, column: 5, scope: !29)
// CHECK:STDOUT: !39 = !DILocation(line: 25, column: 15, scope: !29)
// CHECK:STDOUT: !40 = !DILocation(line: 25, column: 10, scope: !29)
// CHECK:STDOUT: !41 = !DILocation(line: 25, column: 3, scope: !29)
// CHECK:STDOUT: !42 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main.de5b400758c39a65", scope: null, file: !3, line: 21, type: !43, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !45)
// CHECK:STDOUT: !43 = !DISubroutineType(types: !44)
// CHECK:STDOUT: !44 = !{!7, !7, !32}
// CHECK:STDOUT: !45 = !{!46, !47}
// CHECK:STDOUT: !46 = !DILocalVariable(arg: 1, scope: !42, type: !7)
// CHECK:STDOUT: !47 = !DILocalVariable(arg: 2, scope: !42, type: !32)
// CHECK:STDOUT: !48 = !DILocation(line: 22, column: 7, scope: !42)
// CHECK:STDOUT: !49 = !DILocation(line: 22, column: 6, scope: !42)
// CHECK:STDOUT: !50 = !DILocation(line: 23, column: 5, scope: !42)
// CHECK:STDOUT: !51 = !DILocation(line: 25, column: 15, scope: !42)
// CHECK:STDOUT: !52 = !DILocation(line: 25, column: 10, scope: !42)
// CHECK:STDOUT: !53 = !DILocation(line: 25, column: 3, scope: !42)
// CHECK:STDOUT: !54 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main.779b9c0f3b54a7f8", scope: null, file: !3, line: 21, type: !43, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !55)
// CHECK:STDOUT: !55 = !{!56, !57}
// CHECK:STDOUT: !56 = !DILocalVariable(arg: 1, scope: !54, type: !7)
// CHECK:STDOUT: !57 = !DILocalVariable(arg: 2, scope: !54, type: !32)
// CHECK:STDOUT: !58 = !DILocation(line: 22, column: 7, scope: !54)
// CHECK:STDOUT: !59 = !DILocation(line: 22, column: 6, scope: !54)
// CHECK:STDOUT: !60 = !DILocation(line: 23, column: 5, scope: !54)
// CHECK:STDOUT: !61 = !DILocation(line: 25, column: 15, scope: !54)
// CHECK:STDOUT: !62 = !DILocation(line: 25, column: 10, scope: !54)
// CHECK:STDOUT: !63 = !DILocation(line: 25, column: 3, scope: !54)
// CHECK:STDOUT: !64 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main.706e9f413f1bae3d", scope: null, file: !3, line: 21, type: !43, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !65)
// CHECK:STDOUT: !65 = !{!66, !67}
// CHECK:STDOUT: !66 = !DILocalVariable(arg: 1, scope: !64, type: !7)
// CHECK:STDOUT: !67 = !DILocalVariable(arg: 2, scope: !64, type: !32)
// CHECK:STDOUT: !68 = !DILocation(line: 22, column: 7, scope: !64)
// CHECK:STDOUT: !69 = !DILocation(line: 22, column: 6, scope: !64)
// CHECK:STDOUT: !70 = !DILocation(line: 23, column: 12, scope: !64)
// CHECK:STDOUT: !71 = !DILocation(line: 23, column: 5, scope: !64)
// CHECK:STDOUT: !72 = !DILocation(line: 25, column: 15, scope: !64)
// CHECK:STDOUT: !73 = !DILocation(line: 25, column: 10, scope: !64)
// CHECK:STDOUT: !74 = !DILocation(line: 25, column: 3, scope: !64)
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