# Function core::arch::x86_64::_mm_clmulepi64_si128
1.27.0[−][src]

    pub unsafe fn _mm_clmulepi64_si128(a: __m128i, b: __m128i, imm8: i32) -> __m128i

This is supported on x86-64 and target feature `pclmulqdq` only.

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

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