Function _mm512_srav_epi64 

pub fn _mm512_srav_epi64(a: __m512i, count: __m512i) -> __m512i

Available on x86 and target feature avx512f only.

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.

Intel’s documentation