[PATCH v2] msvcrt: Make the cosh/sinh/tanh functions NAN preserving

[Piotr Caban]

Hi Martin,

On 7/16/21 2:05 PM, Martin Storsjo wrote:
> @@ -1139,6 +1139,9 @@ float CDECL coshf( float x )
>       UINT32 ui = *(UINT32*)&x;
>       float t;
>   
> +    if (isnan(x))
> +        return x;
> +
A quick test shows that ucrtbase returns something like:
if (isnan(x)) {
     *(DWORD*)&x |= 0x400000;
     return x;
}

Probably it will make sense to move the code to integrate better with 
musl implementation. Instead of checking for nan with isnan function it 
can be done here:
/* |x| > log(FLT_MAX) or nan */
if (ui > 0x7f800000)
     *(DWORD*)&t = *(DWORD*)&x | 0x400000;
else
     t = __expo2f(x, 1.0f);
return t;

Thanks,
Piotr