pub unsafe fn _mm256_mask_srav_epi64(
    src: __m256i,
    k: __mmask8,
    a: __m256i,
    count: __m256i
) -> __m256i
🔬 This is a nightly-only experimental API. (stdsimd #48556)
Available on x86-64 and target feature avx512f,avx512vl only.
Expand description

Shift packed 64-bit integers in a right by the amount specified by the corresponding element in count while shifting in sign bits, and store the results in dst using writemask k (elements are copied from src when the corresponding mask bit is not set).

Intel’s documentation