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Nigel Tao e78c45720c vector: add SIMD versions of xxxAccumulateMask. 
name                              old time/op  new time/op  delta
GlyphAlphaLoose16Over-8           3.96µs ± 0%  3.64µs ± 1%   -8.08%   (p=0.000 n=8+10)
GlyphAlphaLoose16Src-8            3.64µs ± 0%  3.35µs ± 0%   -7.88%    (p=0.000 n=8+9)
GlyphAlphaLoose32Over-8           8.45µs ± 0%  6.74µs ± 0%  -20.22%    (p=0.000 n=8+9)
GlyphAlphaLoose32Src-8            7.24µs ± 0%  5.54µs ± 1%  -23.48%   (p=0.000 n=8+10)
GlyphAlphaLoose64Over-8           22.2µs ± 0%  17.4µs ± 0%  -21.67%    (p=0.000 n=9+9)
GlyphAlphaLoose64Src-8            17.6µs ± 1%  12.2µs ± 1%  -30.32%  (p=0.000 n=10+10)
GlyphAlphaLoose128Over-8          67.9µs ± 0%  53.3µs ± 1%  -21.53%  (p=0.000 n=10+10)
GlyphAlphaLoose128Src-8           48.2µs ± 0%  32.6µs ± 2%  -32.41%   (p=0.000 n=9+10)
GlyphAlphaLoose256Over-8           242µs ± 1%   187µs ± 1%  -22.96%    (p=0.000 n=9+9)
GlyphAlphaLoose256Src-8            163µs ± 0%   105µs ± 1%  -35.83%    (p=0.000 n=9+9)
GlyphRGBA16Over-8                 5.25µs ± 1%  4.95µs ± 0%   -5.78%    (p=0.000 n=9+9)
GlyphRGBA16Src-8                  4.72µs ± 0%  4.43µs ± 1%   -6.22%   (p=0.000 n=9+10)
GlyphRGBA32Over-8                 13.5µs ± 0%  11.9µs ± 1%  -12.19%   (p=0.000 n=9+10)
GlyphRGBA32Src-8                  11.5µs ± 1%   9.8µs ± 0%  -14.72%    (p=0.000 n=9+9)
GlyphRGBA64Over-8                 42.0µs ± 2%  36.9µs ± 1%  -12.19%  (p=0.000 n=10+10)
GlyphRGBA64Src-8                  34.1µs ± 1%  28.5µs ± 0%  -16.25%    (p=0.000 n=9+7)
GlyphRGBA128Over-8                 149µs ± 2%   133µs ± 1%  -10.24%   (p=0.000 n=10+9)
GlyphRGBA128Src-8                  115µs ± 1%    99µs ± 1%  -13.57%   (p=0.000 n=9+10)
GlyphRGBA256Over-8                 566µs ± 0%   511µs ± 1%   -9.85%   (p=0.000 n=9+10)
GlyphRGBA256Src-8                  435µs ± 0%   372µs ± 0%  -14.64%    (p=0.000 n=9+8)
GlyphNRGBA16Over-8                26.9µs ± 3%  26.0µs ± 3%   -3.55%   (p=0.000 n=10+9)
GlyphNRGBA16Src-8                 18.8µs ± 2%  18.4µs ± 2%   -2.21%   (p=0.000 n=9+10)
GlyphNRGBA32Over-8                99.1µs ± 2%  95.9µs ± 3%   -3.23%  (p=0.000 n=10+10)
GlyphNRGBA32Src-8                 65.6µs ± 3%  62.8µs ± 2%   -4.36%  (p=0.000 n=10+10)
GlyphNRGBA64Over-8                 376µs ± 4%   370µs ± 2%     ~     (p=0.063 n=10+10)
GlyphNRGBA64Src-8                  238µs ± 3%   233µs ± 1%   -2.21%   (p=0.000 n=9+10)
GlyphNRGBA128Over-8               1.52ms ± 2%  1.48ms ± 0%   -2.11%   (p=0.000 n=10+8)
GlyphNRGBA128Src-8                 951µs ± 3%   935µs ± 1%   -1.69%   (p=0.013 n=10+9)
GlyphNRGBA256Over-8               6.00ms ± 1%  5.87ms ± 3%   -2.12%  (p=0.002 n=10+10)
GlyphNRGBA256Src-8                3.94ms ± 2%  3.80ms ± 2%   -3.64%  (p=0.000 n=10+10)

A comparison of the non-SIMD and SIMD versions:

name                              time/op
FixedAccumulateMask16-8            237ns ± 0%
FixedAccumulateMaskSIMD16-8       80.0ns ± 1%
FloatingAccumulateMask16-8         413ns ± 2%
FloatingAccumulateMaskSIMD16-8     166ns ± 0%
FixedAccumulateMask64-8           3.42µs ± 0%
FixedAccumulateMaskSIMD64-8       1.09µs ± 0%
FloatingAccumulateMask64-8        6.92µs ± 0%
FloatingAccumulateMaskSIMD64-8    2.47µs ± 1%

Change-Id: Ib6980e5975ed2842ff2a372f76dd5f2e95c5526c
Reviewed-on: https://go-review.googlesource.com/30898
Reviewed-by: David Crawshaw <crawshaw@golang.org>
2016-10-14 04:48:47 +00:00
bmp bmp: optimize decoding and encoding 0xH sized images. 2015-05-11 00:10:33 +00:00
cmd/webp-manual-test webp: fix tests for webp/nycbcra deprecation. 2016-04-02 01:02:22 +00:00
colornames colornames: export variables such as Darkred. 2016-05-27 00:36:51 +00:00
draw draw: have Scale and Transform recognize straight copies. 2015-08-02 10:47:07 +00:00
example/font example/font: use an "example" build tag instead of "ignore". 2016-04-12 11:14:18 +00:00
font font/plan9font: look for subfont ".0" suffixes. 2016-08-07 01:57:26 +00:00
math math/fixed: add Mul methods. 2016-08-25 00:04:48 +00:00
riff riff: fix some short chunk data bugs. 2016-07-07 05:37:58 +00:00
testdata draw: tweak the YCbCr to RGBA conversion formula. 2015-07-15 05:30:06 +00:00
tiff tiff: reject TIFF images with unsorted IFD tags. 2016-10-04 16:59:28 +00:00
vector vector: add SIMD versions of xxxAccumulateMask. 2016-10-14 04:48:47 +00:00
vp8 vp8: split expression to placate 386 compiler 2015-07-29 22:52:57 +00:00
vp8l vp8l: don't ignore I/O errors when reading LZ77 parameters. 2015-05-11 04:53:56 +00:00
webp webp: make a placeholder package for Go 1.5 and earlier. 2016-07-16 05:04:44 +00:00
.gitattributes image: copying .gitattributes to all subrepositories 2014-12-23 11:05:35 +00:00
.gitignore convert .hgignore to .gitignore. 2014-12-08 10:42:30 +11:00
AUTHORS go.empty: prototype for new subrepository 2012-01-25 14:45:13 -05:00
codereview.cfg image: add codereview.cfg 2015-03-18 17:04:05 +00:00
CONTRIBUTING.md doc: add CONTRIBUTING.md 2015-02-20 05:00:47 +00:00
CONTRIBUTORS go.empty: prototype for new subrepository 2012-01-25 14:45:13 -05:00
LICENSE LICENSE: add 2012-03-17 15:20:31 +11:00
PATENTS go.image: add PATENTS file to the subrepo. 2012-04-16 11:25:02 +10:00
README go.image: initial code. 2012-01-31 11:32:50 +11:00

README 

This repository holds supplementary Go image libraries.

To submit changes to this repository, see http://golang.org/doc/contribute.html.