Xfermode: SSE2 implementation of colordodge&colorburn modes
With SSE2 optimization, performance of the related benchmarks will improve
about 45% for Xfermode_ColorDodge and little for Xfermode_ColorBurn on
desktop i7-3770. The little performance improvement for
Xfermode_ColorBurn is due to the portable version may mostly go the fast
if branch while the SSE2 version do the calculation for all the three
if-else branches. Here are the data:
before:
Xfermode_ColorDodge 8888: cmsecs = 73.71 565: cmsecs = 82.88
Xfermode_ColorBurn 8888: cmsecs = 46.46 565: cmsecs = 52.23
after:
Xfermode_ColorDodge 8888: cmsecs = 39.70 565: cmsecs = 47.45
Xfermode_ColorBurn 8888: cmsecs = 45.02 565: cmsecs = 51.15
BUG=skia:
R=mtklein@google.com
Author: qiankun.miao@intel.com
Review URL: https://codereview.chromium.org/224823004
git-svn-id: http://skia.googlecode.com/svn/trunk/src@14377 2bbb7eff-a529-9590-31e7-b0007b416f81
2 files changed
