================
@@ -3595,15 +3595,26 @@ static llvm::StoreInst
*findDominatingStoreToReturnValue(CodeGenFunction &CGF) {
llvm::BasicBlock *IP = CGF.Builder.GetInsertBlock();
if (IP->empty()) return nullptr;
- // Look at directly preceding instruction, skipping bitcasts and lifetime
- // markers.
+ // Look at directly preceding instruction, skipping bitcasts, lifetime
+ // markers, and fake uses and their operands.
+ const llvm::Instruction *LoadIntoFakeUse = nullptr;
for (llvm::Instruction &I : make_range(IP->rbegin(), IP->rend())) {
+ // Ignore instructions that are just loads for fake uses; the load should
+ // immediately precede the fake use, so we only need to remember the
+ // operand for the last fake use seen.
+ if (LoadIntoFakeUse == &I)
+ continue;
if (isa<llvm::BitCastInst>(&I))
continue;
- if (auto *II = dyn_cast<llvm::IntrinsicInst>(&I))
+ if (auto *II = dyn_cast<llvm::IntrinsicInst>(&I)) {
if (II->getIntrinsicID() == llvm::Intrinsic::lifetime_end)
continue;
+ if (II->getIntrinsicID() == llvm::Intrinsic::fake_use) {
+ LoadIntoFakeUse = dyn_cast<llvm::Instruction>(II->getArgOperand(0));
----------------
pogo59 wrote:
It's looking at the operand, not the preceding instruction.
`CodeGenFunction::EmitFakeUse` generates the operand as a load, and that's the
only place fake uses get created IIUC. You could have an assert here that the
operand is a load.
https://github.com/llvm/llvm-project/pull/110102
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