================
@@ -177,6 +199,16 @@ ABIArgInfo NVPTXABIInfo::classifyReturnType(QualType
RetTy) const {
isUnsupportedType(RetTy))
return coerceToIntArrayWithLimit(RetTy, 64);
+ // Return an aggregate that contains a union as an integer array of the same
+ // size. Use the original LLVM type's ABI alignment for the array elements
+ // so the PTX return parameter keeps its alignment while all bytes of the
+ // active union member are returned.
+ if (isOrContainsUnion(getContext(), RetTy)) {
+ unsigned Align =
+ getDataLayout().getABITypeAlign(CGT.ConvertType(RetTy)).value() * 8;
+ return coerceToIntArrayWithLimit(RetTy, Align);
----------------
efriedma-quic wrote:
Splitting a struct into its component fields will given weird results in
general for structs with padding, even if there isn't a union.
Most targets transform to an array by default. See also #185083.
https://github.com/llvm/llvm-project/pull/237655
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