tree 17e2c22477e1eeed1e6b0311d168f8b3d8229d12
parent e0936e55becaaacce1a54c5dc063995f288546b7
author Nigel Tao <nigeltao@golang.org> 1552207696 +1100
committer Nigel Tao <nigeltao@golang.org> 1552705335 +1100

Eliminate a branch in std/deflate decoding

name                                             old speed      new speed      delta

wuffs_deflate_decode_1k_full_init/clang5          139MB/s ± 1%   151MB/s ± 1%   +9.19%  (p=0.000 n=28+30)
wuffs_deflate_decode_1k_part_init/clang5          169MB/s ± 1%   187MB/s ± 1%  +11.15%  (p=0.000 n=28+28)
wuffs_deflate_decode_10k_full_init/clang5         200MB/s ± 0%   242MB/s ± 1%  +20.99%  (p=0.000 n=28+28)
wuffs_deflate_decode_10k_part_init/clang5         205MB/s ± 1%   249MB/s ± 1%  +21.51%  (p=0.000 n=29+29)
wuffs_deflate_decode_100k_just_one_read/clang5    255MB/s ± 1%   280MB/s ± 1%   +9.86%  (p=0.000 n=29+30)
wuffs_deflate_decode_100k_many_big_reads/clang5   218MB/s ± 0%   241MB/s ± 1%  +10.58%  (p=0.000 n=27+24)

wuffs_deflate_decode_1k_full_init/gcc7            155MB/s ± 1%   155MB/s ± 2%     ~     (p=0.521 n=28+29)
wuffs_deflate_decode_1k_part_init/gcc7            190MB/s ± 1%   191MB/s ± 1%   +0.51%  (p=0.000 n=27+28)
wuffs_deflate_decode_10k_full_init/gcc7           265MB/s ± 1%   266MB/s ± 1%   +0.54%  (p=0.000 n=29+30)
wuffs_deflate_decode_10k_part_init/gcc7           272MB/s ± 1%   274MB/s ± 1%   +0.73%  (p=0.000 n=29+30)
wuffs_deflate_decode_100k_just_one_read/gcc7      317MB/s ± 0%   318MB/s ± 0%   +0.58%  (p=0.000 n=28+28)
wuffs_deflate_decode_100k_many_big_reads/gcc7     252MB/s ± 1%   253MB/s ± 0%   +0.64%  (p=0.000 n=29+27)