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
30 lines
995 B
LLVM
30 lines
995 B
LLVM
; RUN: opt < %s -lcssa -S | FileCheck %s
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; RUN: opt < %s -passes=lcssa -S | FileCheck %s
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; RUN: opt < %s -debugify -lcssa -S | FileCheck -check-prefix=DEBUGIFY %s
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define void @lcssa(i1 %S2) {
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; CHECK-LABEL: @lcssa
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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 ; <i32> [#uses=1]
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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 ; <i32> [#uses=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 ] ; <i32> [#uses=1]
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br i1 %S2, label %loop.exit, label %loop.interior
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loop.exit: ; preds = %post.if
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; CHECK: %X3.lcssa = phi i32
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; DEBUGIFY: %X3.lcssa = phi i32 {{.*}}, !dbg ![[DbgLoc:[0-9]+]]
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; CHECK: %X4 = add i32 3, %X3.lcssa
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%X4 = add i32 3, %X3 ; <i32> [#uses=0]
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ret void
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}
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; Make sure the lcssa phi has %X3's debug location
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; DEBUGIFY: ![[DbgLoc]] = !DILocation(line: 7
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