tree af4111c5198821a06f9d344749a282a08fc40cbc
parent 8f3d875d3fb6947ae75802d970b8f1a7fbb4915a
author Nigel Tao <nigeltao@golang.org> 1615178508 +1100
committer Nigel Tao <nigeltao@golang.org> 1615178508 +1100

Use 8-byte-chunk copy for decode_huffman_fast32

On a Raspberry Pi 4 (32-bit armv7l) with -march=native and -mfpu=neon
("native" means "armv8-a+crc+simd"):

wuffs_deflate_decode_1k_full_init/clang9                  45.1MB/s ± 5%   47.2MB/s ± 6%     ~     (p=0.151 n=5+5)
wuffs_deflate_decode_1k_part_init/clang9                  60.6MB/s ± 0%   64.2MB/s ± 0%   +5.94%  (p=0.008 n=5+5)
wuffs_deflate_decode_10k_full_init/clang9                 82.0MB/s ± 1%  104.8MB/s ± 1%  +27.75%  (p=0.008 n=5+5)
wuffs_deflate_decode_10k_part_init/clang9                 87.9MB/s ± 0%  114.4MB/s ± 0%  +30.13%  (p=0.008 n=5+5)
wuffs_deflate_decode_100k_just_one_read/clang9             111MB/s ± 0%    139MB/s ± 0%  +26.03%  (p=0.008 n=5+5)
wuffs_deflate_decode_100k_many_big_reads/clang9           60.2MB/s ± 0%   63.3MB/s ± 0%   +5.28%  (p=0.008 n=5+5)

wuffs_deflate_decode_1k_full_init/gcc8                    45.8MB/s ± 3%   47.4MB/s ± 1%   +3.38%  (p=0.032 n=5+5)
wuffs_deflate_decode_1k_part_init/gcc8                    63.0MB/s ± 1%   62.8MB/s ± 1%     ~     (p=0.151 n=5+5)
wuffs_deflate_decode_10k_full_init/gcc8                   87.9MB/s ± 0%  102.9MB/s ± 1%  +17.08%  (p=0.008 n=5+5)
wuffs_deflate_decode_10k_part_init/gcc8                   95.3MB/s ± 0%  111.5MB/s ± 0%  +17.03%  (p=0.008 n=5+5)
wuffs_deflate_decode_100k_just_one_read/gcc8               115MB/s ± 0%    130MB/s ± 0%  +12.38%  (p=0.008 n=5+5)
wuffs_deflate_decode_100k_many_big_reads/gcc8             58.9MB/s ± 0%   60.1MB/s ± 0%   +1.94%  (p=0.008 n=5+5)

mimic_deflate_decode_1k                                   77.7MB/s ± 1%   77.2MB/s ± 1%     ~     (p=0.222 n=5+5)
mimic_deflate_decode_10k                                   114MB/s ± 0%    114MB/s ± 1%     ~     (p=0.548 n=5+5)
mimic_deflate_decode_100k_just_one_read                    158MB/s ± 0%    158MB/s ± 0%     ~     (p=0.056 n=5+5)
mimic_deflate_decode_100k_many_big_reads                   113MB/s ± 0%    113MB/s ± 0%     ~     (p=0.690 n=5+5)

----

wuffs_gzip_decode_10k/clang9                              91.4MB/s ± 0%  106.9MB/s ± 0%  +16.93%  (p=0.008 n=5+5)
wuffs_gzip_decode_100k/clang9                              113MB/s ± 0%    128MB/s ± 0%  +13.01%  (p=0.008 n=5+5)

wuffs_gzip_decode_10k/gcc8                                92.2MB/s ± 0%  109.7MB/s ± 0%  +19.00%  (p=0.008 n=5+5)
wuffs_gzip_decode_100k/gcc8                                111MB/s ± 0%    119MB/s ± 0%   +7.43%  (p=0.008 n=5+5)

mimic_gzip_decode_10k                                     98.2MB/s ± 0%   98.1MB/s ± 0%     ~     (p=0.222 n=5+5)
mimic_gzip_decode_100k                                     128MB/s ± 0%    128MB/s ± 0%   +0.11%  (p=0.008 n=5+5)

----

wuffs_zlib_decode_10k/clang9                              90.8MB/s ± 0%  111.5MB/s ± 0%  +22.86%  (p=0.008 n=5+5)
wuffs_zlib_decode_100k/clang9                              108MB/s ± 0%    134MB/s ± 0%  +23.90%  (p=0.008 n=5+5)

wuffs_zlib_decode_10k/gcc8                                92.3MB/s ± 0%  108.2MB/s ± 0%  +17.15%  (p=0.008 n=5+5)
wuffs_zlib_decode_100k/gcc8                                112MB/s ± 0%    119MB/s ± 0%   +6.90%  (p=0.008 n=5+5)

mimic_zlib_decode_10k                                      108MB/s ± 0%    108MB/s ± 0%   +0.39%  (p=0.008 n=5+5)
mimic_zlib_decode_100k                                     143MB/s ± 0%    141MB/s ± 0%   -1.28%  (p=0.008 n=5+5)

----

wuffs_png_decode_image_19k_8bpp/clang9                    72.4MB/s ± 0%   81.9MB/s ± 0%  +13.10%  (p=0.008 n=5+5)
wuffs_png_decode_image_40k_24bpp/clang9                    104MB/s ± 0%    104MB/s ± 0%   -0.40%  (p=0.008 n=5+5)
wuffs_png_decode_image_77k_8bpp/clang9                     274MB/s ± 0%    301MB/s ± 0%   +9.80%  (p=0.008 n=5+5)
wuffs_png_decode_image_552k_32bpp_ignore_checksum/clang9   165MB/s ± 0%    183MB/s ± 0%  +10.96%  (p=0.016 n=4+5)
wuffs_png_decode_image_552k_32bpp_verify_checksum/clang9   160MB/s ± 1%    178MB/s ± 0%  +11.28%  (p=0.008 n=5+5)
wuffs_png_decode_image_4002k_24bpp/clang9                 98.1MB/s ± 0%   98.9MB/s ± 0%   +0.82%  (p=0.016 n=5+4)

wuffs_png_decode_image_19k_8bpp/gcc8                      73.5MB/s ± 0%   80.4MB/s ± 0%   +9.33%  (p=0.008 n=5+5)
wuffs_png_decode_image_40k_24bpp/gcc8                      104MB/s ± 0%    106MB/s ± 0%   +1.73%  (p=0.008 n=5+5)
wuffs_png_decode_image_77k_8bpp/gcc8                       248MB/s ± 0%    272MB/s ± 0%   +9.67%  (p=0.008 n=5+5)
wuffs_png_decode_image_552k_32bpp_ignore_checksum/gcc8     163MB/s ± 0%    177MB/s ± 0%   +8.89%  (p=0.008 n=5+5)
wuffs_png_decode_image_552k_32bpp_verify_checksum/gcc8     157MB/s ± 0%    170MB/s ± 0%   +8.42%  (p=0.008 n=5+5)
wuffs_png_decode_image_4002k_24bpp/gcc8                   98.6MB/s ± 0%  100.9MB/s ± 0%   +2.29%  (p=0.008 n=5+5)

mimic_png_decode_image_19k_8bpp                           43.7MB/s ± 0%   43.7MB/s ± 0%     ~     (p=0.690 n=5+5)
mimic_png_decode_image_40k_24bpp                          54.6MB/s ± 0%   54.6MB/s ± 0%     ~     (p=0.151 n=5+5)
mimic_png_decode_image_77k_8bpp                            125MB/s ± 0%    124MB/s ± 0%   -0.28%  (p=0.008 n=5+5)
mimic_png_decode_image_552k_32bpp_ignore_checksum               skipped
mimic_png_decode_image_552k_32bpp_verify_checksum          102MB/s ± 0%    102MB/s ± 0%     ~     (p=0.238 n=5+5)
mimic_png_decode_image_4002k_24bpp                        81.7MB/s ± 0%   81.8MB/s ± 0%   +0.09%  (p=0.008 n=5+5)