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[DebugInfo] Ensure that a demanded bits optimisation in
InstCombine does not result in an incorrect debuginfo variable value - Add an additional salvage and a test. Reviewers: aprantl, djtodoro Differential Revision: https://reviews.llvm.org/D76854 Bugzilla: https://bugs.llvm.org/show_bug.cgi?id=44371
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Chris Jackson
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Mar 30, 2020
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llvm/test/DebugInfo/X86/instcombine-demanded-bits-salvage.ll
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; RUN: opt -mtriple=x86_64-- %s -S --instcombine -o - | FileCheck %s | ||
; Verify that demanded bits optimisations don't affect debuginfo | ||
; variable values. | ||
; Bugzilla #44371 | ||
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@a = common dso_local local_unnamed_addr global i32 0, align 4 | ||
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define dso_local i32 @p() local_unnamed_addr !dbg !11 { | ||
entry: | ||
%conv = load i32, i32* @a, align 4, !dbg !14 | ||
%0 = and i32 %conv, 65535, !dbg !14 | ||
; CHECK: metadata !DIExpression(DW_OP_constu, 65535, DW_OP_and, DW_OP_stack_value)) | ||
call void @llvm.dbg.value(metadata i32 %0, metadata !15, metadata !DIExpression()), !dbg !14 | ||
%1 = lshr i32 %0, 12, !dbg !14 | ||
%2 = and i32 %1, 8, !dbg !14 | ||
%3 = xor i32 %2, 8, !dbg !14 | ||
ret i32 0, !dbg !14 | ||
} | ||
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declare void @llvm.dbg.value(metadata, metadata, metadata) | ||
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!llvm.dbg.cu = !{!0} | ||
!llvm.module.flags = !{!8, !9} | ||
!llvm.ident = !{!10} | ||
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !3, globals: !2, splitDebugInlining: false, nameTableKind: None) | ||
!1 = !DIFile(filename: "instcomnine.ll", directory: "/temp/bz44371") | ||
!2 = !{} | ||
!3 = !{!7} | ||
!7 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) | ||
!8 = !{i32 7, !"Dwarf Version", i32 4} | ||
!9 = !{i32 2, !"Debug Info Version", i32 3} | ||
!10 = !{!""} | ||
!11 = distinct !DISubprogram(name: "p", scope: !1, file: !1, line: 6, type: !12, scopeLine: 6, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0) | ||
!12 = !DISubroutineType(types: !13) | ||
!13 = !{!7} | ||
!14 = !DILocation(line: 4, column: 35, scope: !11) | ||
!15 = !DILocalVariable(name: "p_28", arg: 1, scope: !11, file: !1, line: 16, type: !7) |