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[x64] Add GFNI and AVX512VBMI optimization for VECTOR_SHL(int8) #2247

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[x64] Add GFNI and AVX512VBMI optimization for VECTOR_SHL(int8) #2247

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Commits on Feb 8, 2024

  1. [x64] Add GFNI and AVX512VBMI optimization for VECTOR_SHL(int8) 

    Uses `{v}gf2p8mulb` as a general int8-multiplication instruction to simulate bit-shifts.
    @Wunkolo
    Wunkolo committed Feb 8, 2024
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