pub unsafe fn _mm512_mask_compressstoreu_pd(
    base_addr: *mut u8,
    k: __mmask8,
    a: __m512d
)
🔬This is a nightly-only experimental API. (stdsimd #48556)
Available on (x86 or x86-64) and target feature avx512f and x86-64 only.
Expand description

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

Intel’s documentation