Commits on Nov 26, 2022

1. zstd: Improve throughput of SpeedBestCompression encoder …

   Lifted ofCode and mlCode computations out of match.estBits, so that
   method will be inlined into its only caller. Also some changes to
   eliminate a branch: the last if block becomes two CMOVs/CSELs on
   amd64 and arm64.
   
   name                              old speed      new speed       delta
   Encoder_EncodeAllSimple/best-8    11.1MB/s ± 1%   16.9MB/s ± 1%  +52.23%  (p=0.000 n=10+10)
   Encoder_EncodeAllSimple4K/best-8  8.41MB/s ± 1%  10.95MB/s ± 0%  +30.20%  (p=0.000 n=10+10)
   
   name                              old alloc/op   new alloc/op    delta
   Encoder_EncodeAllSimple/best-8       20.0B ± 0%      18.0B ± 0%  -10.00%  (p=0.002 n=8+10)
   Encoder_EncodeAllSimple4K/best-8     2.00B ± 0%      2.00B ± 0%     ~     (all equal)

   

   greatroar committed Nov 26, 2022
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