[Bug target/110953] Introducing the "wincall" Calling Convention for GCC

[unlvsur at live dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110953

--- Comment #1 from cqwrteur <unlvsur at live dot com> ---
TLDR:

floating-point and __m128
stack XMM8  XMM7  XMM6  XMM5  XMM4  XMM3  XMM2  XMM1  XMM0

__m256
stack YMM8  YMM7  YMM6  YMM5  YMM4  YMM3  YMM2  YMM1  YMM0

__m512
stack ZMM8  ZMM7  ZMM6  ZMM5  ZMM4  ZMM3  ZMM2  ZMM1  ZMM0

bool, integer and __uint128_t/__int128_t and std::float128_t
stack R19   R18   R17   R16   R9    R8    RDX   RCX

Aggregates (8, 16, 32, or 64 bits. 128 bits split to 2) and __m64
stack R19   R18   R17   R16   R9    R8    RDX   RCX

Other aggregates, as pointers
stack R19   R18   R17   R16   R9    R8    RDX   RCX

carry flag for exception