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chacha20: Improve AVX2 performance #261

Merged
merged 3 commits into from
Aug 9, 2021
Merged

chacha20: Improve AVX2 performance #261

merged 3 commits into from
Aug 9, 2021

Commits on Aug 9, 2021

  1. chacha20: Add a backend::avx2::StateWord helper union 

    This removes a bunch of instructions for accessing the 128-bit lanes.
    @str4d
    str4d committed Aug 9, 2021
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  2. chacha20: Rename backend state words to match RFC 7539

    @str4d
    str4d committed Aug 9, 2021
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  3. chacha20: Optimise diagonalization in SSE2 and AVX2 backends 

    The `b` state word is on the hot path, so we pivot the diagonalization
to move the shuffles onto the other state words. See the code comment,
or sneves/blake2-avx2#4 for additional details.
    @str4d
    str4d committed Aug 9, 2021
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