Function _mm512_mask_compress_epi32 

pub fn _mm512_mask_compress_epi32(
    src: __m512i,
    k: __mmask16,
    a: __m512i,
) -> __m512i

Available on x86-64 and target feature avx512f only.

Contiguously store the active 32-bit integers in a (those with their respective bit set in writemask k) to dst, and pass through the remaining elements from src.

Intel’s documentation