Function _mm_alignr_epi64

pub unsafe fn _mm_alignr_epi64(
    a: __m128i,
    b: __m128i,
    const IMM8: i32,
) -> __m128i

🔬This is a nightly-only experimental API. (stdarch_x86_avx512 #111137)

Available on (x86 or x86-64) and target feature avx512f,avx512vl and x86-64 only.

Concatenate a and b into a 32-byte immediate result, shift the result right by imm8 64-bit elements, and store the low 16 bytes (2 elements) in dst.

Intel’s documentation