Compares the lower single-precision, floating-point value of a and b for a equal to b.
int _mm_comieq_ss(__m128 a,__m128 b ); COMISS
If a and b are equal, 1 is returned. Otherwise, 0 is returned. If a or b is a NaN, 1 is returned.
r := (a0 == b0) ? 0x1 : 0x0
END Microsoft Specific