tree 3eb519fe655af288415bb261b90d030ad951739c
parent 41825fcaaec6283bbab04a8d398581f27bf78219
author Nigel Tao <nigeltao@golang.org> 1613306221 +1100
committer Nigel Tao <nigeltao@golang.org> 1613307216 +1100

Add std/png decoder.filter_4_distance_?_arm_neon

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

wuffs_png_decode_filt_4_dist_3/clang9                      180MB/s ± 0%    217MB/s ± 0%   +20.57%  (p=0.008 n=5+5)
wuffs_png_decode_filt_4_dist_4/clang9                      161MB/s ± 0%    287MB/s ± 0%   +78.75%  (p=0.008 n=5+5)
wuffs_png_decode_image_40k_24bpp/clang9                   99.1MB/s ± 0%   99.4MB/s ± 0%    +0.27%  (p=0.008 n=5+5)
wuffs_png_decode_image_552k_32bpp_ignore_checksum/clang9   123MB/s ± 0%    165MB/s ± 0%   +33.61%  (p=0.008 n=5+5)
wuffs_png_decode_image_552k_32bpp_verify_checksum/clang9   112MB/s ± 0%    146MB/s ± 0%   +29.64%  (p=0.008 n=5+5)
wuffs_png_decode_image_4002k_24bpp/clang9                 93.1MB/s ± 0%   93.2MB/s ± 0%    +0.15%  (p=0.040 n=5+5)

wuffs_png_decode_filt_4_dist_3/gcc8                       80.5MB/s ± 0%  211.7MB/s ± 0%  +163.12%  (p=0.008 n=5+5)
wuffs_png_decode_filt_4_dist_4/gcc8                       77.3MB/s ± 0%  280.4MB/s ± 0%  +262.98%  (p=0.008 n=5+5)
wuffs_png_decode_image_40k_24bpp/gcc8                     98.1MB/s ± 0%  100.8MB/s ± 0%    +2.78%  (p=0.008 n=5+5)
wuffs_png_decode_image_552k_32bpp_ignore_checksum/gcc8     114MB/s ± 0%    162MB/s ± 0%   +41.95%  (p=0.008 n=5+5)
wuffs_png_decode_image_552k_32bpp_verify_checksum/gcc8     103MB/s ± 0%    140MB/s ± 0%   +36.07%  (p=0.008 n=5+5)
wuffs_png_decode_image_4002k_24bpp/gcc8                   93.2MB/s ± 0%   94.1MB/s ± 0%    +0.96%  (p=0.008 n=5+5)