tree f1fd9ef8cdbce952386ecb0b24995d039bcf0873
parent a7ef82f7db524a01c45c2addf442bcc9fd709dc0
author Nigel Tao <nigeltao@golang.org> 1617941779 +1000
committer Nigel Tao <nigeltao@golang.org> 1617942712 +1000

Optimize std/deflate decoding for RLE sections

name                                                      old speed      new speed      delta

wuffs_deflate_decode_1k_full_init/clang9                   104MB/s ± 1%   104MB/s ± 1%     ~     (p=0.161 n=9+9)
wuffs_deflate_decode_1k_part_init/clang9                   121MB/s ± 1%   119MB/s ± 1%   -0.92%  (p=0.000 n=9+9)
wuffs_deflate_decode_10k_full_init/clang9                  223MB/s ± 1%   223MB/s ± 1%     ~     (p=0.796 n=9+9)
wuffs_deflate_decode_10k_part_init/clang9                  230MB/s ± 1%   228MB/s ± 2%     ~     (p=0.065 n=10+9)
wuffs_deflate_decode_100k_just_one_read/clang9             279MB/s ± 1%   292MB/s ± 0%   +4.78%  (p=0.000 n=9+8)
wuffs_deflate_decode_100k_many_big_reads/clang9            178MB/s ± 5%   189MB/s ± 2%   +6.41%  (p=0.000 n=10+10)

wuffs_deflate_decode_1k_full_init/gcc10                    103MB/s ± 1%   102MB/s ± 1%   -0.57%  (p=0.022 n=10+9)
wuffs_deflate_decode_1k_part_init/gcc10                    122MB/s ± 1%   121MB/s ± 3%   -1.46%  (p=0.000 n=10+9)
wuffs_deflate_decode_10k_full_init/gcc10                   235MB/s ± 1%   231MB/s ± 1%   -1.34%  (p=0.000 n=10+8)
wuffs_deflate_decode_10k_part_init/gcc10                   242MB/s ± 1%   239MB/s ± 0%   -1.40%  (p=0.001 n=9+8)
wuffs_deflate_decode_100k_just_one_read/gcc10              300MB/s ± 4%   297MB/s ± 2%     ~     (p=0.156 n=10+9)
wuffs_deflate_decode_100k_many_big_reads/gcc10             193MB/s ± 2%   197MB/s ± 1%   +2.29%  (p=0.000 n=10+9)

wuffs_gzip_decode_10k/clang9                               220MB/s ± 1%   219MB/s ± 1%     ~     (p=0.605 n=9+9)
wuffs_gzip_decode_100k/clang9                              269MB/s ± 2%   283MB/s ± 2%   +4.98%  (p=0.000 n=9+10)

wuffs_gzip_decode_10k/gcc10                                227MB/s ± 1%   224MB/s ± 1%   -1.42%  (p=0.000 n=10+9)
wuffs_gzip_decode_100k/gcc10                               283MB/s ± 1%   285MB/s ± 4%     ~     (p=0.182 n=9+10)

wuffs_zlib_decode_10k/clang9                               226MB/s ± 1%   220MB/s ± 4%   -2.66%  (p=0.000 n=9+10)
wuffs_zlib_decode_100k/clang9                              272MB/s ± 2%   285MB/s ± 1%   +4.77%  (p=0.000 n=10+8)

wuffs_zlib_decode_10k/gcc10                                227MB/s ± 1%   212MB/s ± 1%   -6.80%  (p=0.000 n=10+9)
wuffs_zlib_decode_100k/gcc10                               282MB/s ± 1%   273MB/s ± 0%   -3.32%  (p=0.000 n=9+8)

wuffs_png_decode_image_19k_8bpp/clang9                     148MB/s ± 1%   138MB/s ± 2%   -6.79%  (p=0.000 n=9+10)
wuffs_png_decode_image_40k_24bpp/clang9                    170MB/s ± 1%   171MB/s ± 2%     ~     (p=0.133 n=9+10)
wuffs_png_decode_image_77k_8bpp/clang9                     525MB/s ± 1%   495MB/s ± 4%   -5.81%  (p=0.000 n=8+9)
wuffs_png_decode_image_552k_32bpp_ignore_checksum/clang9   400MB/s ± 2%   457MB/s ± 4%  +14.16%  (p=0.000 n=9+9)
wuffs_png_decode_image_552k_32bpp_verify_checksum/clang9   388MB/s ± 1%   435MB/s ± 5%  +12.17%  (p=0.000 n=9+10)
wuffs_png_decode_image_4002k_24bpp/clang9                  175MB/s ± 1%   172MB/s ± 2%   -1.78%  (p=0.005 n=10+10)

wuffs_png_decode_image_19k_8bpp/gcc10                      154MB/s ± 3%   157MB/s ± 1%   +1.72%  (p=0.001 n=9+9)
wuffs_png_decode_image_40k_24bpp/gcc10                     182MB/s ± 1%   187MB/s ± 1%   +2.56%  (p=0.000 n=9+10)
wuffs_png_decode_image_77k_8bpp/gcc10                      552MB/s ± 3%   554MB/s ± 1%     ~     (p=0.863 n=9+9)
wuffs_png_decode_image_552k_32bpp_ignore_checksum/gcc10    426MB/s ± 2%   502MB/s ± 1%  +17.85%  (p=0.000 n=10+10)
wuffs_png_decode_image_552k_32bpp_verify_checksum/gcc10    410MB/s ± 2%   481MB/s ± 1%  +17.17%  (p=0.000 n=9+8)
wuffs_png_decode_image_4002k_24bpp/gcc10                   186MB/s ± 1%   189MB/s ± 2%   +1.33%  (p=0.001 n=9+10)