2020-08-31 07:17:43 +08:00
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; RUN: opt -early-cse -earlycse-debug-hash -S %s -o - | FileCheck %s
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2019-02-12 18:54:30 +08:00
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; PR40628: The first load below is determined to be redundant by EarlyCSE.
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; During salvaging, the corresponding dbg.value could have a DW_OP_deref used
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; in its DIExpression to represent the redundant operation -- however LLVM
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; cannot currently determine that the subsequent store should terminate the
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; variables location range. A debugger would display zero for the "redundant"
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; variable after stepping onto the return instruction.
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; Test that the load being removed results in the corresponding dbg.value
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; being assigned the 'undef' value.
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; CHECK: @foo
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; CHECK-NEXT: dbg.value(metadata i32 undef, metadata ![[DEADVAR:[0-9]+]],
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; CHECK-NEXT: load
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; CHECK-NEXT: dbg.value(metadata i32 %{{[0-9]+}}, metadata ![[LIVEVAR:[0-9]+]],
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; CHECK-NEXT: store
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; CHECK-NEXT: ret
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; CHECK: ![[DEADVAR]] = !DILocalVariable(name: "redundant",
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; CHECK: ![[LIVEVAR]] = !DILocalVariable(name: "loaded",
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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define dso_local i32 @foo(i32*) !dbg !7 {
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%2 = load i32, i32* %0, align 4, !dbg !23
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call void @llvm.dbg.value(metadata i32 %2, metadata !16, metadata !DIExpression()), !dbg !23
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%3 = load i32, i32* %0, align 4, !dbg !23
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call void @llvm.dbg.value(metadata i32 %3, metadata !17, metadata !DIExpression()), !dbg !23
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store i32 0, i32* %0, align 4, !dbg !23
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ret i32 %3, !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 = !{!0}
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!llvm.module.flags = !{!3, !4, !5}
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!llvm.ident = !{!6}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
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!1 = !DIFile(filename: "pr40628.c", directory: ".")
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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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!5 = !{i32 1, !"wchar_size", i32 4}
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!6 = !{!"clang"}
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!7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 2, type: !8, scopeLine: 3, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !12)
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!8 = !DISubroutineType(types: !9)
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!9 = !{!10, !11}
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!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !10, size: 64)
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!12 = !{!16, !17}
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!16 = !DILocalVariable(name: "redundant", scope: !7, file: !1, line: 4, type: !10)
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!17 = !DILocalVariable(name: "loaded", scope: !7, file: !1, line: 5, type: !10)
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!23 = !DILocation(line: 4, column: 7, scope: !7)
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