Function core_arch::x86_64::_mm256_sad_epu8

pub unsafe fn _mm256_sad_epu8(a: __m256i, b: __m256i) -> __m256i

This is supported on x86-64 and target feature avx2 only.

Computes the absolute differences of packed unsigned 8-bit integers in a and b, then horizontally sum each consecutive 8 differences to produce four unsigned 16-bit integers, and pack these unsigned 16-bit integers in the low 16 bits of the 64-bit return value

Intel's documentation