pub unsafe fn _mm256_mask_compressstoreu_epi64(
    base_addr: *mut u8,
    k: __mmask8,
    a: __m256i
)
🔬This is a nightly-only experimental API. (stdsimd #48556)
Available on (x86 or x86-64) and target feature avx512f,avx512vl and x86-64 only.
Expand description

Contiguously store the active 64-bit integers in a (those with their respective bit set in writemask k) to unaligned memory at base_addr.

Intel’s documentation