public static ulong bits_extractparallel(ulong x, ulong mask)
{
if (Bmi2.IsBmi2Supported)
{
return(Bmi2.pext_u64(x, mask));
}
else
{
ulong result = 0;
for (ulong i = 1; mask != 0; i += i)
{
if ((x & bits_extractlowest(mask)) != 0)
{
result |= i;
}
else
{
}
mask = bits_resetlowest(mask);
}
return(result);
}
}