Propagate DebugLocs on phis in BreakCriticalEdges #133492
Merged
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This was referenced Mar 28, 2025
This was referenced Mar 28, 2025
|
@llvm/pr-subscribers-llvm-transforms Author: Orlando Cazalet-Hyams (OCHyams) ChangesFull diff: https://github.com/llvm/llvm-project/pull/133492.diff 2 Files Affected:
diff --git a/llvm/lib/Transforms/Utils/BreakCriticalEdges.cpp b/llvm/lib/Transforms/Utils/BreakCriticalEdges.cpp
index d20902c577d3a..4d9d9e1fec48d 100644
--- a/llvm/lib/Transforms/Utils/BreakCriticalEdges.cpp
+++ b/llvm/lib/Transforms/Utils/BreakCriticalEdges.cpp
@@ -445,6 +445,7 @@ bool llvm::SplitIndirectBrCriticalEdges(Function &F,
PHINode *NewIndPHI = PHINode::Create(IndPHI->getType(), 1, "ind", InsertPt);
NewIndPHI->addIncoming(IndPHI->getIncomingValueForBlock(IBRPred),
IBRPred);
+ NewIndPHI->setDebugLoc(IndPHI->getDebugLoc());
// Create a PHI in the body block, to merge the direct and indirect
// predecessors.
@@ -452,6 +453,8 @@ bool llvm::SplitIndirectBrCriticalEdges(Function &F,
MergePHI->insertBefore(MergeInsert);
MergePHI->addIncoming(NewIndPHI, Target);
MergePHI->addIncoming(DirPHI, DirectSucc);
+ MergePHI->applyMergedLocation(DirPHI->getDebugLoc(),
+ IndPHI->getDebugLoc());
IndPHI->replaceAllUsesWith(MergePHI);
IndPHI->eraseFromParent();
diff --git a/llvm/test/Transforms/CodeGenPrepare/X86/split-dbg.ll b/llvm/test/Transforms/CodeGenPrepare/X86/split-dbg.ll
new file mode 100644
index 0000000000000..773ae3ff9a3e5
--- /dev/null
+++ b/llvm/test/Transforms/CodeGenPrepare/X86/split-dbg.ll
@@ -0,0 +1,49 @@
+; RUN: opt -passes='require<profile-summary>,function(codegenprepare)' -S -mtriple=x86_64 < %s \
+; RUN: | FileCheck %s
+
+;; Check debug locations are propagated onto new PHIs.
+
+; CHECK: .split:
+; CHECK-NEXT: %merge = phi i32 [ poison, %while.body ], [ %dest.sroa.clone, %while.body.clone ], !dbg [[DBG:!.*]]
+
+; CHECK: while.body.clone:
+; CHECK-NEXT: %dest.sroa.clone = phi i32 [ %1, %.split ], [ poison, %if.else ], !dbg [[DBG]]
+
+define void @test(i1 %c) !dbg !5 {
+entry:
+ br label %if.else
+
+if.else: ; preds = %if.else1, %entry
+ br i1 %c, label %while.body, label %preheader
+
+preheader: ; preds = %if.else
+ br label %if.else1
+
+if.then: ; preds = %if.else1
+ unreachable
+
+while.body: ; preds = %if.else1, %while.body, %if.else
+ %dest.sroa = phi i32 [ %1, %while.body ], [ poison, %if.else1 ], [ poison, %if.else ], !dbg !8
+ %0 = inttoptr i32 %dest.sroa to ptr
+ %incdec.ptr = getelementptr inbounds i8, ptr %0, i32 -1
+ %1 = ptrtoint ptr %incdec.ptr to i32
+ store i8 0, ptr %incdec.ptr, align 1
+ br label %while.body
+
+if.else1: ; preds = %if.else1, %preheader
+ indirectbr ptr poison, [label %if.then, label %while.body, label %if.else, label %if.else1]
+}
+
+!llvm.dbg.cu = !{!0}
+!llvm.debugify = !{!2, !3}
+!llvm.module.flags = !{!4}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C, file: !1, producer: "debugify", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug)
+!1 = !DIFile(filename: "test.ll", directory: "/")
+!2 = !{i32 11}
+!3 = !{i32 0}
+!4 = !{i32 2, !"Debug Info Version", i32 3}
+!5 = distinct !DISubprogram(name: "test", linkageName: "test", scope: null, file: !1, line: 1, type: !6, scopeLine: 1, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0)
+!6 = !DISubroutineType(types: !7)
+!7 = !{}
+!8 = !DILocation(line: 1, column: 1, scope: !5)
|
This was referenced Apr 7, 2025
OCHyams
requested review from
PeimingLiu,
yinying-lisa-li,
matthias-springer,
JDevlieghere,
lanza,
bcardosolopes,
Endilll,
nikic and
a team
as code owners
OCHyams
removed request for
a team,
nikic,
keith,
rupprecht,
JDevlieghere,
matthias-springer,
bcardosolopes,
lanza,
Endilll,
aaronmondal,
PeimingLiu,
aartbik and
yinying-lisa-li
|
✅ With the latest revision this PR passed the C/C++ code formatter. |
|
✅ With the latest revision this PR passed the Python code formatter. |
|
✅ With the latest revision this PR passed the undef deprecator. |
|
LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/190/builds/19660 Here is the relevant piece of the build log for the reference |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
No description provided.