# Function core::arch::x86::_mm_maskz_gf2p8affine_epi64_epi8

source ·

    pub unsafe fn _mm_maskz_gf2p8affine_epi64_epi8(
        k: __mmask16,
        x: __m128i,
        a: __m128i,
        const B: i32,
    ) -> __m128i

🔬This is a nightly-only experimental API. (`stdarch_x86_avx512` #111137)
Available on (x86 or x86-64) and target feature `gfni,avx512bw,avx512vl` and x86 only.
Expand description

Performs an affine transformation on the packed bytes in x. That is computes a*x+b over the Galois Field 2^8 for each packed byte with a being a 8x8 bit matrix and b being a constant 8-bit immediate value. Each pack of 8 bytes in x is paired with the 64-bit word at the same position in a.

Uses the writemask in k - elements are zeroed in the result if the corresponding mask bit is not set. Otherwise the computation result is written into the result.

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