Function _mm_madd_epi16
#[target_feature(enable = "sse2")]
pub fn _mm_madd_epi16(a: __m128i, b: __m128i) -> __m128iMultiplies and then horizontally add signed 16 bit integers in a and b.
Multiplies packed signed 16-bit integers in a and b, producing
intermediate signed 32-bit integers. Horizontally add adjacent pairs of
intermediate 32-bit integers.