Function _mm_maskz_permutex2var_epi64 

pub fn _mm_maskz_permutex2var_epi64(
    k: __mmask8,
    a: __m128i,
    idx: __m128i,
    b: __m128i,
) -> __m128i

Available on x86-64 and target feature avx512f and target feature avx512vl only.

Shuffle 64-bit integers in a and b across lanes using the corresponding selector and index in idx, and store the results in dst using zeromask k (elements are zeroed out when the corresponding mask bit is not set).

Intel’s documentation