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[DebugInfo][LCSSA] Preserve debug location in lcssa phis

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Summary:
When inserting lcssa Phi Nodes in the exit block
mak sure to preserve the original instructions DL.

Reviewers: vsk

Subscribers: JDevlieghere, llvm-commits

Differential Revision: https://reviews.llvm.org/D50009

llvm-svn: 338391
This commit is contained in:
Anastasis Grammenos 2018-07-31 14:54:52 +00:00
parent fa008c0805
commit ab84cfb37d
2 changed files with 7 additions and 3 deletions
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3
lib/Transforms/Utils/LCSSA.cpp
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@ -144,7 +144,8 @@ bool llvm::formLCSSAForInstructions(SmallVectorImpl<Instruction *> &Worklist,
PHINode *PN = PHINode::Create(I->getType(), PredCache.size(ExitBB),
I->getName() + ".lcssa", &ExitBB->front());
// Get the debug location from the original instruction.
PN->setDebugLoc(I->getDebugLoc());
// Add inputs from inside the loop for this PHI.
for (BasicBlock *Pred : PredCache.get(ExitBB)) {
PN->addIncoming(I, Pred);

7
test/Transforms/LCSSA/basictest.ll
View File

@ -1,6 +1,6 @@
; RUN: opt < %s -lcssa -S | FileCheck %s
; RUN: opt < %s -passes=lcssa -S | FileCheck %s
; RUN: opt < %s -debugify -lcssa -S | FileCheck -check-prefix=CHECK2 %s
; RUN: opt < %s -debugify -lcssa -S | FileCheck -check-prefix=DEBUGIFY %s
define void @lcssa(i1 %S2) {
; CHECK-LABEL: @lcssa
@ -19,9 +19,12 @@ post.if: ; preds = %if.false, %if.true
br i1 %S2, label %loop.exit, label %loop.interior
loop.exit: ; preds = %post.if
; CHECK: %X3.lcssa = phi i32
; CHECK2: call void @llvm.dbg.value(metadata i32 %X3.lcssa
; DEBUGIFY: %X3.lcssa = phi i32 {{.*}}, !dbg ![[DbgLoc:[0-9]+]]
; DEBUGIFY-NEXT: call void @llvm.dbg.value(metadata i32 %X3.lcssa
; CHECK: %X4 = add i32 3, %X3.lcssa
%X4 = add i32 3, %X3 ; <i32> [#uses=0]
ret void
}
; Make sure the lcssa phi has %X3's debug location
; DEBUGIFY: ![[DbgLoc]] = !DILocation(line: 7