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image/png: use branch-free abs function
benchmark old ns/op new ns/op delta BenchmarkPaeth 5.06 6.02 +18.97% BenchmarkDecodeGray 1010551 956911 -5.31% BenchmarkDecodeNRGBAGradient 3877813 3754160 -3.19% BenchmarkDecodeNRGBAOpaque 3194058 3079094 -3.60% BenchmarkDecodePaletted 699243 700211 +0.14% BenchmarkDecodeRGB 2835733 2692120 -5.06% BenchmarkDecodeInterlacing 3651805 3563124 -2.43% BenchmarkEncodeGray 4399183 4404113 +0.11% BenchmarkEncodeNRGBOpaque 13323627 13306485 -0.13% BenchmarkEncodeNRGBA 15840092 15751188 -0.56% BenchmarkEncodePaletted 4396622 4404373 +0.18% BenchmarkEncodeRGBOpaque 13320475 13279189 -0.31% BenchmarkEncodeRGBA 36898392 36781002 -0.32% LGTM=nigeltao R=nigeltao CC=golang-codereviews https://golang.org/cl/117290043
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