================
@@ -3083,6 +3083,19 @@ ScalarExprEmitter::VisitUnaryExprOrTypeTraitExpr(
E->getTypeOfArgument()->getPointeeType()))
.getQuantity();
return llvm::ConstantInt::get(CGF.SizeTy, Alignment);
+ } else if (E->getKind() == UETT_VectorElements) {
+ // For scalable vectors, we don't know the size at compile time. We can use
+ // @llvm.vscale to calculate it at runtime.
+ if (E->getTypeOfArgument()->isSizelessVectorType()) {
+ auto *VecTy = dyn_cast<llvm::ScalableVectorType>(
+ ConvertType(E->getTypeOfArgument()));
+ uint64_t NumUnscaledElements = VecTy->getMinNumElements();
+
+ llvm::Value *VScale =
+ Builder.CreateVScale(llvm::ConstantInt::get(CGF.SizeTy, 1));
+ return Builder.CreateMul(
+ VScale, llvm::ConstantInt::get(CGF.SizeTy, NumUnscaledElements));
----------------
nikic wrote:
You can use `Builder.CreateElementCount(CGF.SizeTy, VecTy->getElementCount())`
or so here. (Incidentally, this works for both fixed and scalable vectors.)
https://github.com/llvm/llvm-project/pull/69010
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