Function _mm512_mask_madd_epi16
#[target_feature(enable = "avx512bw")]
pub fn _mm512_mask_madd_epi16(src: __m512i, k: __mmask16, a: __m512i, b: __m512i) -> __m512iMultiply packed signed 16-bit integers in a and b, producing intermediate signed 32-bit integers. Horizontally add adjacent pairs of intermediate 32-bit integers, and pack the results in dst using writemask k (elements are copied from src when the corresponding mask bit is not set).