commit 75dda04b0a4b6f435eee7e491862177258488186
author commit-bot@chromium.org <commit-bot@chromium.org@2bbb7eff-a529-9590-31e7-b0007b416f81> Fri Nov 08 20:14:16 2013 +0000
committer commit-bot@chromium.org <commit-bot@chromium.org@2bbb7eff-a529-9590-31e7-b0007b416f81> Fri Nov 08 20:14:16 2013 +0000
tree 13754ec18e00ca6980e493951870169d2ae96a42
parent ae553db4c7e96b5de88a78c8d195f34f8ea94d8e

Add sk_float_rsqrt with SSE + NEON fast paths.

Current numbers:

N4:
running bench [640 480]      math_fastIsqrt    NONRENDERING: cmsecs =      3.12
running bench [640 480]      math_slowIsqrt    NONRENDERING: cmsecs =      4.82
running bench [640 480] math_sk_float_rsqrt    NONRENDERING: cmsecs =      1.99

Desktop:
running bench [640 480]      math_fastIsqrt    NONRENDERING: cmsecs =      0.89
running bench [640 480]      math_slowIsqrt    NONRENDERING: cmsecs =      0.94
running bench [640 480] math_sk_float_rsqrt    NONRENDERING: cmsecs =      0.09

Haven't found any other benches where this is a significant effect yet.

BUG=
R=reed@google.com

Author: mtklein@google.com

Review URL: https://codereview.chromium.org/60083014

git-svn-id: http://skia.googlecode.com/svn/trunk/src@12203 2bbb7eff-a529-9590-31e7-b0007b416f81