================
@@ -1476,8 +1486,14 @@ CoerceScalableToFixed(CodeGenFunction &CGF,
llvm::FixedVectorType *ToTy,
// If we are casting a scalable i1 predicate vector to a fixed i8
// vector, first bitcast the source.
if (FromTy->getElementType()->isIntegerTy(1) &&
- FromTy->getElementCount().isKnownMultipleOf(8) &&
ToTy->getElementType() == CGF.Builder.getInt8Ty()) {
+ if (!FromTy->getElementCount().isKnownMultipleOf(8)) {
+ FromTy = llvm::ScalableVectorType::get(
+ FromTy->getElementType(),
+ llvm::alignTo<8>(FromTy->getElementCount().getKnownMinValue()));
+ llvm::Value *ZeroVec = llvm::Constant::getNullValue(FromTy);
----------------
paulwalker-arm wrote:
If it's a choice between the LangRef and an old mailing list post then I think
the LangRef should win. At least the bitcast part of the LangRef suggests this
is not true, which is backed up by https://godbolt.org/z/n67WTcf1v that shows
effort is put in to preserving the known bits?
https://github.com/llvm/llvm-project/pull/139190
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