asb added a comment.
In https://reviews.llvm.org/D40023#933464, @majnemer wrote:
> So how does something like the following work:
>
> union U { float f; int i; };
> void f(union U u);
>
>
> The flattening described in
> https://github.com/riscv/riscv-elf-psabi-doc/blob/master/riscv-elf.md#hardware-floating-point-calling-convention
> makes sense for arrays and structs but I couldn't find where unions were
> described.
You're right that's not currently described - I have an issue tracking this
here: https://github.com/riscv/riscv-elf-psabi-doc/issues/24. Last time I tried
to check gcc behaviour it seemed that such cases would be passed according to
the integer calling convention, but I'd be happier if one of the GCC devs would
confirm.
https://reviews.llvm.org/D40023
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