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flate: Improve level 5+6 compression #656

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merged 1 commit into from
Sep 7, 2022
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Commits on Sep 7, 2022

  1. flate: Improve level 5+6 compression

    Skip 2 bytes when doing end-of-match search.
    
    This allows better matches to be picked up further forward, adding up to 2 literals, but giving a better match.
    
    Level 5:
    
    nyc: 779171549 -> 767765165
    github-june: 943488021 -> 938777887
    github-ranks: 435111686 -> 435008334
    sofia: 3083510553 -> 3048677443
    
    level6, nyc: 768119006 -> 753545897
    
    Performance unchanged.
    klauspost committed Sep 7, 2022
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