wangleiat added a comment.
>>> If we want to ignore empty structures, it is not enough to only modify
>>> psABI, because the current implementations of gcc and clang do not ignore
>>> empty structures in all cases. For example:
>>>
>>> struct { struct{}; int i; }; // in this case, the empty struct is not
>>> ignored.
>>> struct { struct{}; float f; }; // ignored.
>>
>> This is the same behavior as RISC-V. While attempting to pass a struct
>> through FPRs, the empty field is ignored. But if passing through FPR does
>> not work and it's passed through GPRs, the empty fields are not ignored:
Yes, but our psABI still differs from RISC-V in the description of parameter
passing, and it would be better to have consistent behavior regardless of
whether there are floating points or not.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D151298/new/
https://reviews.llvm.org/D151298
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