tree c863948d8e3a08f4e4cfd8d7499e3e17328e2389
parent 279d69bb38b073e496b8a996a021c052bde4cb1c
author Nigel Tao <nigeltao@golang.org> 1612785936 +1100
committer Nigel Tao <nigeltao@golang.org> 1612786740 +1100

Add std/deflate decode_huffman_fast32

This undoes commit 1a63b53e "Have std/deflate read 64 bits once per
inner loop" for 32-bit CPUs.

On a Raspberry Pi 4 (32-bit armv7l):

wuffs_deflate_decode_1k_full_init/clang9         44.9MB/s ± 1%   50.1MB/s ± 1%  +11.54%  (p=0.008 n=5+5)
wuffs_deflate_decode_1k_part_init/clang9         52.8MB/s ± 0%   61.1MB/s ± 0%  +15.61%  (p=0.008 n=5+5)
wuffs_deflate_decode_10k_full_init/clang9        81.4MB/s ± 0%   84.5MB/s ± 0%   +3.89%  (p=0.008 n=5+5)
wuffs_deflate_decode_10k_part_init/clang9        87.9MB/s ± 0%   91.1MB/s ± 0%   +3.67%  (p=0.008 n=5+5)
wuffs_deflate_decode_100k_just_one_read/clang9    106MB/s ± 0%    113MB/s ± 0%   +5.70%  (p=0.008 n=5+5)
wuffs_deflate_decode_100k_many_big_reads/clang9  59.6MB/s ± 0%   59.1MB/s ± 0%   -0.81%  (p=0.008 n=5+5)

wuffs_deflate_decode_1k_full_init/gcc8           44.7MB/s ± 1%   50.9MB/s ± 1%  +13.91%  (p=0.008 n=5+5)
wuffs_deflate_decode_1k_part_init/gcc8           52.6MB/s ± 0%   61.5MB/s ± 0%  +17.06%  (p=0.008 n=5+5)
wuffs_deflate_decode_10k_full_init/gcc8          76.5MB/s ± 0%   85.6MB/s ± 1%  +11.89%  (p=0.008 n=5+5)
wuffs_deflate_decode_10k_part_init/gcc8          82.3MB/s ± 0%   92.2MB/s ± 0%  +12.07%  (p=0.008 n=5+5)
wuffs_deflate_decode_100k_just_one_read/gcc8     97.8MB/s ± 0%  112.1MB/s ± 0%  +14.62%  (p=0.008 n=5+5)
wuffs_deflate_decode_100k_many_big_reads/gcc8    58.0MB/s ± 0%   61.6MB/s ± 0%   +6.09%  (p=0.008 n=5+5)