#include "llvm/Analysis/TargetTransformInfo.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/IR/CFG.h"
+#include "llvm/IR/DebugInfoMetadata.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/IntrinsicInst.h"
// For the rest of the instructions, either hoist to the OrigPreheader if
// possible or create a clone in the OldPreHeader if not.
TerminatorInst *LoopEntryBranch = OrigPreheader->getTerminator();
+
+ // Record all debug intrinsics preceding LoopEntryBranch to avoid duplication.
+ using DbgIntrinsicHash =
+ std::pair<std::pair<Value *, DILocalVariable *>, DIExpression *>;
+ auto makeHash = [](DbgInfoIntrinsic *D) -> DbgIntrinsicHash {
+ return {{D->getVariableLocation(), D->getVariable()}, D->getExpression()};
+ };
+ SmallDenseSet<DbgIntrinsicHash, 8> DbgIntrinsics;
+ for (auto I = std::next(OrigPreheader->rbegin()), E = OrigPreheader->rend();
+ I != E; ++I) {
+ if (auto *DII = dyn_cast<DbgInfoIntrinsic>(&*I))
+ DbgIntrinsics.insert(makeHash(DII));
+ else
+ break;
+ }
+
while (I != E) {
Instruction *Inst = &*I++;
RemapInstruction(C, ValueMap,
RF_NoModuleLevelChanges | RF_IgnoreMissingLocals);
+ // Avoid inserting the same intrinsic twice.
+ if (auto *DII = dyn_cast<DbgInfoIntrinsic>(C))
+ if (DbgIntrinsics.count(makeHash(DII))) {
+ C->deleteValue();
+ continue;
+ }
+
// With the operands remapped, see if the instruction constant folds or is
// otherwise simplifyable. This commonly occurs because the entry from PHI
// nodes allows icmps and other instructions to fold.
call void @llvm.dbg.value(metadata i64 %n, metadata !16, metadata !DIExpression()), !dbg !21
call void @llvm.dbg.value(metadata i64 %s, metadata !17, metadata !DIExpression()), !dbg !22
call void @llvm.dbg.value(metadata i64 0, metadata !18, metadata !DIExpression()), !dbg !23
+ ; CHECK: call void @llvm.dbg.value(metadata i64 0, metadata !18, metadata !DIExpression()), !dbg !23
+ ; CHECK-NOT: call void @llvm.dbg.value(metadata i64 0, metadata !18, metadata !DIExpression()), !dbg !23
br label %for.cond, !dbg !24
for.cond: ; preds = %for.body, %entry