tree 0a37a8c1f9508026726ed6cd01d6e5827e502e76
parent f8a86727c22a193ea626b9bc55f7544b675f5e4b
author Rui Ueyama <ruiu@google.com> 1404088417 +1000
committer Nigel Tao <nigeltao@golang.org> 1404088417 +1000
golang-hg f6e41288d9197205b634f251c58275afb1092e80

go.image/vp8: use branch-free abs

This change seems to restore performance to
the level before CL 108140045.

benchmark                         old ns/op    new ns/op    delta
BenchmarkDecodeVP8SimpleFilter       796416       784394   -1.51%
BenchmarkDecodeVP8NormalFilter      4931138      4693078   -4.83%
BenchmarkDecodeVP8L                 7820030      7821796   +0.02%

LGTM=nigeltao, r
R=nigeltao, r
CC=golang-codereviews
https://golang.org/cl/107340047