================
@@ -2300,6 +2300,9 @@ void CodeGenFunction::EmitStoreOfScalar(llvm::Value
*Value, Address Addr,
SmallVector<int, 16> Mask(NewVecTy->getNumElements(), -1);
std::iota(Mask.begin(), Mask.begin() + VecTy->getNumElements(), 0);
Value = Builder.CreateShuffleVector(Value, Mask, "extractVec");
+ // The extra lanes will be poison. Freeze the whole vector to make sure
+ // the padding memory is not poisoned, which may break coercion.
+ Value = Builder.CreateFreeze(Value);
----------------
fhahn wrote:
Happy to go with either. Not having the freeze is likely to be slightly better
(e.g. we may be able to prove some lanes of the non-padding lanes could be
poison), I just thought initially we might want to stay consistent w.r.t.
shuffle with poison.
Updated now
https://github.com/llvm/llvm-project/pull/164821
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