pub unsafe fn _mm512_alignr_epi64<const IMM8: i32>(
    a: __m512i,
    b: __m512i
) -> __m512i
🔬 This is a nightly-only experimental API. (stdsimd)
This is supported on x86-64 and target feature avx512f only.
Expand description

Concatenate a and b into a 128-byte immediate result, shift the result right by imm8 64-bit elements, and store the low 64 bytes (8 elements) in dst.

Intel’s documentation