Function _mm_multishift_epi64_epi8

#[target_feature(enable = "avx512vbmi", enable = "avx512vl")]
pub fn _mm_multishift_epi64_epi8(a: __m128i, b: __m128i) -> __m128i

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.

Intel's documentation