# Function core::arch::x86_64::_mm_clmulepi64_si128

1.27.0 · source ·

    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.
Expand description

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