Compares the lower double-precision, floating-point value of a and b for a less than b.
int _mm_comilt_sd (__m128d a, __m128d b); COMISD
If a is less than b, 1 is returned. Otherwise, 0 is returned. If a and b is a NaN, 1 is returned.
r := (a0 < b0) ? 0x1 : 0x0
END Microsoft Specific