Function _mm256_mask_maddubs_epi16
#[target_feature(enable = "avx512bw", enable = "avx512vl")]
pub fn _mm256_mask_maddubs_epi16(src: __m256i, k: __mmask16, a: __m256i, b: __m256i) -> __m256iMultiply packed unsigned 8-bit integers in a by packed signed 8-bit integers in b, producing intermediate signed 16-bit integers. Horizontally add adjacent pairs of intermediate signed 16-bit integers, and pack the saturated results in dst using writemask k (elements are copied from src when the corresponding mask bit is not set).