# [−][src]Function core::arch::x86::_mm256_clmulepi64_epi128

    pub unsafe fn _mm256_clmulepi64_epi128(
        a: __m256i,
        b: __m256i,
        imm8: i32
    ) -> __m256i

🔬 This is a nightly-only experimental API. (`stdsimd` #48556)
This is supported on x86 and target feature `avx512vpclmulqdq,avx512vl` only.

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

Intel's documentation