Multiplies the 8 signed 16-bit integers from a by the 8 signed 16-bit integers from b.
__m128i _mm_mulhi_epi16 (__m128i a, __m128i b); PMULHW
Packs the upper 16 bits of the 8 signed 32-bit results.
r0 := (a0 * b0)[31:16] r1 := (a1 * b1)[31:16] ... r7 := (a7 * b7)[31:16]
END Microsoft Specific