https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107726
--- Comment #1 from cqwrteur <unlvsur at live dot com> ---
#if __has_cpp_attribute(__gnu__::__target__) && defined(__SSE2__) &&
!defined(__AVX2__)
[[__gnu__::__target__("default")]]
#elif __has_cpp_attribute(__gnu__::__flatten__)
[[__gnu__::__flatten__]]
#endif
inline void sha512_runtime_routine(std::uint_least64_t* __restrict
state,std::byte const* __restrict blocks_start,std::byte const* __restrict
blocks_last) noexcept;
#if __has_cpp_attribute(__gnu__::__target__) && defined(__SSE2__) &&
!defined(__AVX2__)
[[__gnu__::__target__("avx2")]]
#elif __has_cpp_attribute(__gnu__::__flatten__)
[[__gnu__::__flatten__]]
#endif
inline void sha512_runtime_routine(std::uint_least64_t* __restrict
state,std::byte const* __restrict blocks_start,std::byte const* __restrict
blocks_last) noexcept;
Something like this.
