56 lines
2.7 KiB
LLVM
56 lines
2.7 KiB
LLVM
; Check for setting dbg.value as undef which depends on trivially dead instructions.
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; RUN: opt -instcombine -S -o - %s | FileCheck %s
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@a = common dso_local global i8 0, align 1, !dbg !0
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@b = common dso_local global i8 0, align 1, !dbg !6
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define dso_local i32 @main() !dbg !13 {
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entry:
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%0 = load i8, i8* @a, align 1, !dbg !17
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%dec = add i8 %0, -1, !dbg !17
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store i8 %dec, i8* @a, align 1, !dbg !17
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;CHECK: call void @llvm.dbg.value(metadata i32 undef
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;CHECK: call void @llvm.dbg.value(metadata i32 -8
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;CHECK: call void @llvm.dbg.value(metadata i32 undef
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%conv = sext i8 %dec to i32, !dbg !17
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%udiv = udiv i32 %conv, 4, !dbg !17
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call void @llvm.dbg.value(metadata i32 %udiv, metadata !18, metadata !DIExpression()), !dbg !19
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call void @llvm.dbg.value(metadata i32 -8, metadata !20, metadata !DIExpression()), !dbg !19
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call void @llvm.dbg.value(metadata i32 %udiv, metadata !20, metadata !DIExpression()), !dbg !19
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store i8 0, i8* @b, align 1, !dbg !21
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%cmp = icmp sgt i32 %conv, 0, !dbg !22
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%conv1 = zext i1 %cmp to i32, !dbg !22
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ret i32 0, !dbg !23
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}
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!9, !10, !11}
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!llvm.ident = !{!12}
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!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
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!1 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 1, type: !8, isLocal: false, isDefinition: true)
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!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 10.0.0", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
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!3 = !DIFile(filename: "test", directory: "n")
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!4 = !{}
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!5 = !{!0, !6}
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!6 = !DIGlobalVariableExpression(var: !7, expr: !DIExpression())
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!7 = distinct !DIGlobalVariable(name: "b", scope: !2, file: !3, line: 1, type: !8, isLocal: false, isDefinition: true)
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!8 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
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!9 = !{i32 2, !"Dwarf Version", i32 4}
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!10 = !{i32 2, !"Debug Info Version", i32 3}
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!11 = !{i32 1, !"wchar_size", i32 4}
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!12 = !{!"clang version 10.0.0"}
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!13 = distinct !DISubprogram(name: "main", scope: !3, file: !3, line: 2, type: !14, scopeLine: 2, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !4)
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!14 = !DISubroutineType(types: !15)
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!15 = !{!16}
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!16 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!17 = !DILocation(line: 4, column: 11, scope: !13)
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!18 = !DILocalVariable(name: "c", scope: !13, file: !3, line: 4, type: !16)
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!19 = !DILocation(line: 0, scope: !13)
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!20 = !DILocalVariable(name: "l_1240", scope: !13, file: !3, line: 6, type: !16)
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!21 = !DILocation(line: 10, column: 10, scope: !13)
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!22 = !DILocation(line: 10, column: 5, scope: !13)
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!23 = !DILocation(line: 12, column: 1, scope: !13)
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