pub unsafe fn _mm_mask_multishift_epi64_epi8(
    src: __m128i,
    k: u16,
    a: __m128i,
    b: __m128i
) -> __m128i
🔬 This is a nightly-only experimental API. (stdsimd)
This is supported on x86-64 and target feature avx512vbmi,avx512vl only.
Expand description

For each 64-bit element in b, select 8 unaligned bytes using a byte-granular shift control within the corresponding 64-bit element of a, and store the 8 assembled bytes to the corresponding 64-bit element of dst using writemask k (elements are copied from src when the corresponding mask bit is not set).

Intel’s documentation