Function _mm_clmulepi64_si128

pub unsafe fn _mm_clmulepi64_si128(
    a: __m128i,
    b: __m128i,
    const IMM8: i32,
) -> __m128i

Available on (x86 or x86-64) and target feature pclmulqdq and x86-64 only.

Performs a carry-less multiplication of two 64-bit polynomials over the finite field GF(2).

The immediate byte is used for determining which halves of a and b should be used. Immediate bits other than 0 and 4 are ignored.

Intel’s documentation