pub unsafe fn _mm256_alignr_epi8(
    a: __m256i,
    b: __m256i,
    const IMM8: i32,
) -> __m256iAvailable on (x86 or x86-64) and target feature 
avx2 and x86-64 only.Expand description
Concatenates pairs of 16-byte blocks in a and b into a 32-byte temporary
result, shifts the result right by n bytes, and returns the low 16 bytes.