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@12203 2bbb7eff-a529-9590-31e7-b0007b416f81
5 files changed