Function _mm_mask_packs_epi16
#[target_feature(enable = "avx512bw", enable = "avx512vl")]
pub fn _mm_mask_packs_epi16(src: __m128i, k: __mmask16, a: __m128i, b: __m128i) -> __m128iConvert packed signed 16-bit integers from a and b to packed 8-bit integers using signed saturation, and store the results in dst using writemask k (elements are copied from src when the corresponding mask bit is not set).