tree bb1b2b7cd09c28aa31b8ef42ce4dfd3a3a09aec3
parent 92959fb81f819cc6f63a9cc13240922fa4117c04
author Nigel Tao <nigeltao@golang.org> 1550886461 +1100
committer Nigel Tao <nigeltao@golang.org> 1550886461 +1100

Work around clang memset / branch performance

name                                             old speed      new speed      delta

wuffs_deflate_decode_1k/clang5                    163MB/s ± 0%   163MB/s ± 0%    ~     (p=0.151 n=5+5)
wuffs_deflate_decode_10k/clang5                   230MB/s ± 1%   234MB/s ± 0%  +1.60%  (p=0.008 n=5+5)
wuffs_deflate_decode_100k_just_one_read/clang5    262MB/s ± 1%   265MB/s ± 0%  +0.97%  (p=0.008 n=5+5)
wuffs_deflate_decode_100k_many_big_reads/clang5   220MB/s ± 0%   221MB/s ± 0%  +0.59%  (p=0.008 n=5+5)

wuffs_deflate_decode_1k/gcc7                      193MB/s ± 1%   194MB/s ± 0%    ~     (p=0.151 n=5+5)
wuffs_deflate_decode_10k/gcc7                     276MB/s ± 1%   276MB/s ± 1%    ~     (p=0.690 n=5+5)
wuffs_deflate_decode_100k_just_one_read/gcc7      325MB/s ± 0%   324MB/s ± 1%    ~     (p=0.690 n=5+5)
wuffs_deflate_decode_100k_many_big_reads/gcc7     258MB/s ± 1%   258MB/s ± 0%    ~     (p=0.690 n=5+5)

wuffs_gif_decode_1k_bw/clang5                     430MB/s ± 1%   445MB/s ± 1%  +3.58%  (p=0.008 n=5+5)
wuffs_gif_decode_1k_color/clang5                  186MB/s ± 1%   192MB/s ± 0%  +3.17%  (p=0.008 n=5+5)
wuffs_gif_decode_10k_bgra/clang5                  729MB/s ± 1%   748MB/s ± 1%  +2.53%  (p=0.008 n=5+5)
wuffs_gif_decode_10k_indexed/clang5               196MB/s ± 1%   202MB/s ± 1%  +2.71%  (p=0.008 n=5+5)
wuffs_gif_decode_20k/clang5                       242MB/s ± 2%   251MB/s ± 0%  +3.54%  (p=0.016 n=5+4)
wuffs_gif_decode_100k_artificial/clang5           539MB/s ± 1%   545MB/s ± 1%    ~     (p=0.095 n=5+5)
wuffs_gif_decode_100k_realistic/clang5            221MB/s ± 0%   226MB/s ± 1%  +2.32%  (p=0.008 n=5+5)
wuffs_gif_decode_1000k/clang5                     224MB/s ± 0%   230MB/s ± 1%  +2.28%  (p=0.008 n=5+5)
wuffs_gif_decode_anim_screencap/clang5           1.06GB/s ± 0%  1.07GB/s ± 1%  +1.31%  (p=0.008 n=5+5)

wuffs_gif_decode_1k_bw/gcc7                       478MB/s ± 0%   467MB/s ± 0%  -2.27%  (p=0.008 n=5+5)
wuffs_gif_decode_1k_color/gcc7                    194MB/s ± 0%   196MB/s ± 0%  +0.94%  (p=0.008 n=5+5)
wuffs_gif_decode_10k_bgra/gcc7                    635MB/s ± 1%   639MB/s ± 1%    ~     (p=0.056 n=5+5)
wuffs_gif_decode_10k_indexed/gcc7                 200MB/s ± 1%   202MB/s ± 1%    ~     (p=0.095 n=5+5)
wuffs_gif_decode_20k/gcc7                         242MB/s ± 1%   243MB/s ± 1%    ~     (p=0.421 n=5+5)
wuffs_gif_decode_100k_artificial/gcc7             509MB/s ± 0%   510MB/s ± 0%    ~     (p=1.000 n=5+5)
wuffs_gif_decode_100k_realistic/gcc7              210MB/s ± 0%   211MB/s ± 0%  +0.50%  (p=0.016 n=5+5)
wuffs_gif_decode_1000k/gcc7                       214MB/s ± 0%   214MB/s ± 0%    ~     (p=0.151 n=5+5)
wuffs_gif_decode_anim_screencap/gcc7             1.03GB/s ± 0%  1.03GB/s ± 1%    ~     (p=0.421 n=5+5)

wuffs_lzw_decode_20k/clang5                       263MB/s ± 1%   267MB/s ± 2%    ~     (p=0.151 n=5+5)
wuffs_lzw_decode_100k/clang5                      427MB/s ± 1%   451MB/s ± 2%  +5.61%  (p=0.008 n=5+5)

wuffs_lzw_decode_20k/gcc7                         270MB/s ± 0%   268MB/s ± 0%  -0.66%  (p=0.008 n=5+5)
wuffs_lzw_decode_100k/gcc7                        481MB/s ± 1%   483MB/s ± 1%    ~     (p=0.222 n=5+5)