Function _mm256_mask_permutex2var_epi16

#[target_feature(enable = "avx512bw", enable = "avx512vl")]
pub fn _mm256_mask_permutex2var_epi16(a: __m256i, k: __mmask16, idx: __m256i, b: __m256i) -> __m256i

Shuffle 16-bit integers in a and b across lanes using the corresponding selector and index in idx, and store the results in dst using writemask k (elements are copied from a when the corresponding mask bit is not set).

Intel's documentation