Function _mm512_mask_permutexvar_epi16

#[target_feature(enable = "avx512bw")]
pub fn _mm512_mask_permutexvar_epi16(src: __m512i, k: __mmask32, idx: __m512i, a: __m512i) -> __m512i

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

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