================
@@ -307,7 +307,12 @@ AArch64ABIInfo::classifyArgumentType(QualType Ty, bool
IsVariadic,
// 0.
if (IsEmpty && Size == 0)
return ABIArgInfo::getIgnore();
- return ABIArgInfo::getDirect(llvm::Type::getInt8Ty(getVMContext()));
+ // An empty struct can have size greater than one byte if alignment is
+ // involved.
+ // When size <= 64, we still hold it by i8 in IR and lowering to registers.
+ // When Size > 64, just fall through to avoid va_list out of sync.
----------------
rjmccall wrote:
Yes, I intended that as a suggestion for the comment, and you're welcome to
include it verbatim.
I agree with Eli that I'd like to understand why we need to have this `i8`
carve-out.
https://github.com/llvm/llvm-project/pull/72197
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