forked from OSchip/llvm-project
71 lines
2.9 KiB
LLVM
71 lines
2.9 KiB
LLVM
; RUN: opt -instcombine -S %s -o - | FileCheck %s
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; In this example, the cast from i8* to i32* becomes trivially dead. We should
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; salvage its debug info.
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; C source:
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; void use_as_void(void *);
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; void f(void *p) {
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; int *q = (int *)p;
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; use_as_void(q);
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; }
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; ModuleID = '<stdin>'
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source_filename = "t.c"
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target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-pc-windows-msvc19.11.25508"
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; Function Attrs: nounwind uwtable
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define void @f(i8* %p) !dbg !11 {
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entry:
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call void @llvm.dbg.value(metadata i8* %p, metadata !16, metadata !DIExpression()), !dbg !18
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%0 = bitcast i8* %p to i32*, !dbg !19
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call void @llvm.dbg.value(metadata i32* %0, metadata !17, metadata !DIExpression()), !dbg !20
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%1 = bitcast i32* %0 to i8*, !dbg !21
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call void @use_as_void(i8* %1), !dbg !22
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ret void, !dbg !23
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}
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; CHECK-LABEL: define void @f(i8* %p)
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; CHECK: call void @llvm.dbg.value(metadata i8* %p, metadata ![[P_VAR:[0-9]+]], metadata !DIExpression())
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; CHECK-NOT: bitcast
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; CHECK: call void @llvm.dbg.value(metadata i8* %p, metadata ![[Q_VAR:[0-9]+]], metadata !DIExpression())
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; CHECK-NOT: bitcast
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; CHECK: ret void
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; CHECK: ![[P_VAR]] = !DILocalVariable(name: "p", {{.*}})
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; CHECK: ![[Q_VAR]] = !DILocalVariable(name: "q", {{.*}})
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declare void @use_as_void(i8*)
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!6, !7, !8, !9}
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!llvm.ident = !{!10}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !3)
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!1 = !DIFile(filename: "t.c", directory: "C:\5Csrc\5Cllvm-project\5Cbuild", checksumkind: CSK_MD5, checksum: "56c40617ada23a8cccbd9a16bcec57af")
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!2 = !{}
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!3 = !{!4}
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!4 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !5, size: 64)
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!5 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!6 = !{i32 2, !"CodeView", i32 1}
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!7 = !{i32 2, !"Debug Info Version", i32 3}
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!8 = !{i32 1, !"wchar_size", i32 2}
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!9 = !{i32 7, !"PIC Level", i32 2}
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!10 = !{!"clang version 6.0.0 "}
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!11 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 2, type: !12, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !15)
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!12 = !DISubroutineType(types: !13)
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!13 = !{null, !14}
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!14 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
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!15 = !{!16, !17}
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!16 = !DILocalVariable(name: "p", arg: 1, scope: !11, file: !1, line: 2, type: !14)
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!17 = !DILocalVariable(name: "q", scope: !11, file: !1, line: 3, type: !4)
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!18 = !DILocation(line: 2, column: 14, scope: !11)
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!19 = !DILocation(line: 3, column: 12, scope: !11)
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!20 = !DILocation(line: 3, column: 8, scope: !11)
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!21 = !DILocation(line: 4, column: 15, scope: !11)
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!22 = !DILocation(line: 4, column: 3, scope: !11)
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!23 = !DILocation(line: 5, column: 1, scope: !11)
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