public static float4 subadd(float4 a, float4 b)
{
if (Sse3.IsSse3Supported)
{
v128 temp = Sse3.addsub_ps(*(v128 *)&a, *(v128 *)&b);
return(*(float4 *)&temp);
}
else
{
return(a - math.select(b, -b, new bool4(false, true, false, true)));
}
}