df2b9a3e02
The LCSSA pass makes use of a function insertDebugValuesForPHIs() to propogate dbg.value() intrinsics to newly inserted PHI instructions. Faulty behaviour occurs when the parent PHI of a newly inserted PHI is not the most recent assignment to a source variable. insertDebugValuesForPHIs ends up propagating a value that isn't the most recent assignemnt. This change removes the call to insertDebugValuesForPHIs() from LCSSA, preventing incorrect dbg.value intrinsics from being propagated. Propagating variable locations between blocks will occur later, during LiveDebugValues. Differential Revision: https://reviews.llvm.org/D92576
58 lines
2.2 KiB
LLVM
58 lines
2.2 KiB
LLVM
; RUN: opt < %s -lcssa -S | FileCheck %s
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; This test ensures that LCSSA does not insert dbg.value intrinsics using
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; insertDebugValuesForPHIs() which effectively cause assignments to be
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; re-ordered.
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; See PR48206 for more information.
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define dso_local i32 @_Z5lcssab(i1 zeroext %S2) {
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entry:
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br label %loop.interior
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loop.interior: ; preds = %post.if, %entry
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br i1 %S2, label %if.true, label %if.false
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if.true: ; preds = %loop.interior
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%X1 = add i32 0, 0
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br label %post.if
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if.false: ; preds = %loop.interior
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%X2 = add i32 0, 1
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br label %post.if
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post.if: ; preds = %if.false, %if.true
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%X3 = phi i32 [ %X1, %if.true ], [ %X2, %if.false ], !dbg !21
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call void @llvm.dbg.value(metadata i32 %X3, metadata !9, metadata !DIExpression()), !dbg !21
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%Y1 = add i32 4, %X3, !dbg !22
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call void @llvm.dbg.value(metadata i32 %Y1, metadata !9, metadata !DIExpression()), !dbg !22
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br i1 %S2, label %loop.exit, label %loop.interior, !dbg !23
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loop.exit: ; preds = %post.if
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; CHECK: loop.exit:
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; CHECK-NEXT: %X3.lcssa = phi i32
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; CHECK-NOT: call void @llvm.dbg.value
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%X4 = add i32 3, %X3
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ret i32 %X4
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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.debugify = !{!3, !4}
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!llvm.module.flags = !{!5}
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!0 = distinct !DICompileUnit(language: DW_LANG_C, file: !1, producer: "debugify and Author", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "./testcase.ll", directory: "/")
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!2 = !{}
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!3 = !{i32 11}
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!4 = !{i32 5}
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!5 = !{i32 2, !"Debug Info Version", i32 3}
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!6 = distinct !DISubprogram(name: "_Z5lcssab", linkageName: "_Z5lcssab", scope: null, file: !1, line: 1, type: !7, scopeLine: 1, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !{!9})
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!7 = !DISubroutineType(types: !2)
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!9 = !DILocalVariable(name: "var", scope: !6, file: !1, line: 3, type: !10)
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!10 = !DIBasicType(name: "ty32", size: 32, encoding: DW_ATE_unsigned)
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!21 = !DILocation(line: 7, column: 1, scope: !6)
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!22 = !DILocation(line: 8, column: 1, scope: !6)
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!23 = !DILocation(line: 9, column: 1, scope: !6)
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