#include "llvm/IR/Dominators.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Instructions.h"
+#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/PredIteratorCache.h"
#include "llvm/Pass.h"
#include "llvm/Transforms/Utils.h"
SSAUpdate.RewriteUse(*UseToRewrite);
}
+ SmallVector<DbgValueInst *, 4> DbgValues;
+ llvm::findDbgValues(DbgValues, I);
+
+ // Update pre-existing debug value uses that reside outside the loop.
+ auto &Ctx = I->getContext();
+ for (auto DVI : DbgValues) {
+ BasicBlock *UserBB = DVI->getParent();
+ if (InstBB == UserBB || L->contains(UserBB))
+ continue;
+ // We currently only handle debug values residing in blocks where we have
+ // inserted a PHI instruction.
+ if (Value *V = SSAUpdate.FindValueForBlock(UserBB))
+ DVI->setOperand(0, MetadataAsValue::get(Ctx, ValueAsMetadata::get(V)));
+ }
+
// SSAUpdater might have inserted phi-nodes inside other loops. We'll need
// to post-process them to keep LCSSA form.
for (PHINode *InsertedPN : InsertedPHIs) {
--- /dev/null
+; RUN: opt -S -lcssa < %s | FileCheck %s
+
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+; Reproducer for PR39019.
+;
+; Verify that the llvm.dbg.value in the %for.cond.cleanup2 block is rewritten
+; to use the PHI node for %add that is created by LCSSA.
+
+; CHECK-LABEL: for.cond.cleanup2:
+; CHECK-NEXT: [[PN:%[^ ]*]] = phi i32 [ %add.lcssa, %for.cond.cleanup1 ]
+; CHECK-NEXT: call void @llvm.dbg.value(metadata i32 [[PN]], metadata [[VAR:![0-9]+]], metadata !DIExpression())
+; CHECK-NEXT: call void @bar(i32 [[PN]])
+
+; CHECK-LABEL: for.body:
+; CHECK: %add = add nsw i32 0, 2
+; CHECK: call void @llvm.dbg.value(metadata i32 %add, metadata [[VAR]], metadata !DIExpression())
+
+; CHECK: [[VAR]] = !DILocalVariable(name: "sum",
+
+; Function Attrs: nounwind
+define void @foo() #0 !dbg !6 {
+entry:
+ br label %for.cond.preheader, !dbg !12
+
+for.cond.preheader: ; preds = %for.cond.cleanup1, %entry
+ br label %for.body, !dbg !12
+
+for.cond.cleanup2: ; preds = %for.cond.cleanup1
+ call void @llvm.dbg.value(metadata i32 %add, metadata !9, metadata !DIExpression()), !dbg !12
+ tail call void @bar(i32 %add) #0, !dbg !12
+ ret void, !dbg !12
+
+for.cond.cleanup1: ; preds = %for.body
+ br i1 false, label %for.cond.preheader, label %for.cond.cleanup2, !dbg !12
+
+for.body: ; preds = %for.body, %for.cond.preheader
+ %add = add nsw i32 0, 2, !dbg !12
+ call void @llvm.dbg.value(metadata i32 %add, metadata !9, metadata !DIExpression()), !dbg !12
+ br i1 false, label %for.body, label %for.cond.cleanup1, !dbg !12
+}
+
+; Function Attrs: nounwind
+declare void @bar(i32) #0
+
+; Function Attrs: nounwind readnone speculatable
+declare void @llvm.dbg.value(metadata, metadata, metadata) #1
+
+attributes #0 = { nounwind }
+attributes #1 = { nounwind readnone speculatable }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!3, !4}
+!llvm.ident = !{!5}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 8.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, globals: !2, nameTableKind: None)
+!1 = !DIFile(filename: "foo.c", directory: "/")
+!2 = !{}
+!3 = !{i32 2, !"Dwarf Version", i32 4}
+!4 = !{i32 2, !"Debug Info Version", i32 3}
+!5 = !{!"clang version 8.0.0"}
+!6 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 10, type: !7, isLocal: false, isDefinition: true, scopeLine: 10, isOptimized: true, unit: !0, retainedNodes: !8)
+!7 = !DISubroutineType(types: !2)
+!8 = !{!9}
+!9 = !DILocalVariable(name: "sum", scope: !10, file: !1, line: 11, type: !11)
+!10 = !DILexicalBlockFile(scope: !6, file: !1, discriminator: 0)
+!11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!12 = !DILocation(line: 0, scope: !10)