# Function core::arch::x86::_mm256_clmulepi64_epi128

source ·

    pub unsafe fn _mm256_clmulepi64_epi128(
        a: __m256i,
        b: __m256i,
        const IMM8: i32,
    ) -> __m256i

🔬This is a nightly-only experimental API. (`stdarch_x86_avx512` #111137)
Available on (x86 or x86-64) and target feature `vpclmulqdq` and x86 only.
Expand description

Performs 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.

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