================
@@ -1195,6 +1195,19 @@ bool MicrosoftCXXABI::classifyReturnType(CGFunctionInfo
&FI) const {
// MSVC always returns structs indirectly from C++ instance methods.
bool isIndirectReturn = !isTrivialForABI || FI.isInstanceMethod();
+ // With __vectorcall on x86, HVAs (including HFAs) that can be passed in
+ // registers are returned in vector registers, even if they are not C++14
+ // aggregates and even when returned from instance methods.
+ if (isIndirectReturn &&
+ FI.getCallingConvention() == llvm::CallingConv::X86_VectorCall &&
----------------
efriedma-quic wrote:
This is assuming X86_VectorCall implies the target is x86. Which is a
reasonable assumption; other targets shouldn't allow it.
https://github.com/llvm/llvm-project/pull/113104
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