Function _mm256_clmulepi64_epi128
#[target_feature(enable = "vpclmulqdq")]
pub fn _mm256_clmulepi64_epi128(a: __m256i, b: __m256i, IMM8: i32) -> __m256iPerforms a carry-less multiplication of two 64-bit polynomials over the finite field GF(2) - in each of the 2 128-bit lanes.
The immediate byte is used for determining which halves of each lane a and b
should be used. Immediate bits other than 0 and 4 are ignored.
All lanes share immediate byte.