================
@@ -144,12 +148,25 @@ ArgInfo AArch64TargetInfo::classifyArgumentType(
RecordArgABI::RAA_DirectInMemory);
}
+ // Empty records:
+ // AAPCS64 does not say that empty records are ignored as arguments,
----------------
smithp35 wrote:
AFAIK Darwin uses a modified version of the AAPCS. The only public document
that I know of is
https://developer.apple.com/documentation/xcode/writing-arm64-code-for-apple-platforms#Pass-arguments-to-functions-correctly
> Functions may ignore parameters that contain empty struct types. This
> behavior applies to the GNU extension in C and, where permitted by the
> language, in C++. The AArch64 documentation doesn’t address the issue of
> empty structures as parameters, but Apple chose this path for its
> implementation.
https://github.com/llvm/llvm-project/pull/224476
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