Re: [PATCH v2 0/7] MR6752: include: More fixes to build libc++.

[Jacek Caban (＠jacek)]

Jacek Caban (@jacek) commented about include/winnt.h:
> #endif
>  }
>
> +#if defined(_MSC_VER) && !defined(__arm64ec__) && (!defined(__clang__) || __has_builtin(_umul128))
> +#define UnsignedMultiply128 _umul128
> +DWORD64 _umul128(DWORD64,DWORD64,DWORD64*);
> +#pragma intrinsic(_umul128)
> +#elif !defined(__i386__)
> +static FORCEINLINE DWORD64 UnsignedMultiply128( DWORD64 a, DWORD64 b, DWORD64 *hi )
> +{
> +    unsigned __int128 v = (unsigned __int128)a * b;
> +    *hi = v >> 64;
> +    return (DWORD64)v;
> +}
> +#define _umul128 UnsignedMultiply128
> I think this should be available only for x86_64 target.

-- 
https://gitlab.winehq.org/wine/wine/-/merge_requests/6752#note_86502