# Function _mm_mask_gf2p8affine_epi64_epi8

1.89.0 · Source

    pub fn _mm_mask_gf2p8affine_epi64_epi8(
        src: __m128i,
        k: __mmask16,
        x: __m128i,
        a: __m128i,
        const B: i32,
    ) -> __m128i

Available on (x86 or x86-64) and target feature `gfni` and target feature `avx512bw` and target feature `avx512vl` and x86-64 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 copied from src if the corresponding mask bit is not set. Otherwise the computation result is written into the result.

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