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2d8c535e77
value as undefined
- Correct a debug info salvage and add a test
Reviewers: aprantl, vsk
Differential Revision: https://reviews.llvm.org/D76930
Bugzilla: https://bugs.llvm.org/show_bug.cgi?id=45080
37 lines
1.5 KiB
LLVM
37 lines
1.5 KiB
LLVM
; RUN: opt -mtriple=x86_64-- -S --dse %s -o - | FileCheck %s
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; Ensure that we can mark a value as undefined when performing dead
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; store elimination.
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; Bugzilla #45080
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@b = common dso_local local_unnamed_addr global i32 0, align 1
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define dso_local i32 @main() local_unnamed_addr !dbg !7 {
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%1 = alloca i32, align 4
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%2 = load i32, i32* @b, align 1, !dbg !13
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; CHECK: call void @llvm.dbg.value(metadata i32 undef
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call void @llvm.dbg.value(metadata i32 %2, metadata !12, metadata !DIExpression()), !dbg !13
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store i32 %2, i32* %1, align 4, !dbg !13
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ret i32 0, !dbg !13
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}
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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 = !{!3, !4}
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!llvm.ident = !{!6}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 10.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, globals: !2, nameTableKind: None)
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!1 = !DIFile(filename: "dead-store-elimination-marks-undef.ll", directory: "/temp/bz45080")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!6 = !{!"clang version 10.0.0"}
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!7 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 3, type: !8, scopeLine: 3, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !11)
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!8 = !DISubroutineType(types: !9)
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!9 = !{!10}
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!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!11 = !{!12}
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!12 = !DILocalVariable(name: "l_2864", scope: !7, file: !1, line: 4, type: !10)
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!13 = !DILocation(line: 5, column: 12, scope: !7)
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