pub unsafe fn _mm256_mask_store_epi64(
    mem_addr: *mut i64,
    mask: __mmask8,
    a: __m256i
🔬This is a nightly-only experimental API. (stdsimd #48556)
Available on (x86 or x86-64) and target feature avx512f,avx512vl,avx and x86-64 only.
Expand description

Store packed 64-bit integers from a into memory using writemask k. mem_addr must be aligned on a 32-byte boundary or a general-protection exception may be generated.

Intel’s documentation