Function _mm256_gf2p8mul_epi8
#[target_feature(enable = "gfni", enable = "avx")]
pub fn _mm256_gf2p8mul_epi8(a: __m256i, b: __m256i) -> __m256iPerforms a multiplication in GF(2^8) on the packed bytes. The field is in polynomial representation with the reduction polynomial x^8 + x^4 + x^3 + x + 1.