compress/flate: faster version of forwardCopy
benchmark old ns/op new ns/op delta
BenchmarkDecodeDigitsSpeed1e4 197767 203490 +2.89%
BenchmarkDecodeDigitsSpeed1e5
1873969 1912761 +2.07%
BenchmarkDecodeDigitsSpeed1e6
18922760 19021056 +0.52%
BenchmarkDecodeDigitsDefault1e4 194975 197054 +1.07%
BenchmarkDecodeDigitsDefault1e5
1704262 1719988 +0.92%
BenchmarkDecodeDigitsDefault1e6
16618354 16351957 -1.60%
BenchmarkDecodeDigitsCompress1e4 195281 194626 -0.34%
BenchmarkDecodeDigitsCompress1e5
1694364 1702372 +0.47%
BenchmarkDecodeDigitsCompress1e6
16463347 16492126 +0.17%
BenchmarkDecodeTwainSpeed1e4 200653 200127 -0.26%
BenchmarkDecodeTwainSpeed1e5
1861385 1759632 -5.47%
BenchmarkDecodeTwainSpeed1e6
18255769 17186679 -5.86%
BenchmarkDecodeTwainDefault1e4 189080 185157 -2.07%
BenchmarkDecodeTwainDefault1e5
1559222 1461465 -6.27%
BenchmarkDecodeTwainDefault1e6
14792125 13879051 -6.17%
BenchmarkDecodeTwainCompress1e4 188881 185151 -1.97%
BenchmarkDecodeTwainCompress1e5
1537031 1456945 -5.21%
BenchmarkDecodeTwainCompress1e6
14805972 13405094 -9.46%
BenchmarkPaeth 4 4 -0.89%
BenchmarkDecodeGray 964679 937244 -2.84%
BenchmarkDecodeNRGBAGradient
3753769 3646416 -2.86%
BenchmarkDecodeNRGBAOpaque
3165856 2981300 -5.83%
BenchmarkDecodePaletted 713950 691984 -3.08%
BenchmarkDecodeRGB
3051718 2924260 -4.18%
R=nigeltao, bradfitz
CC=golang-dev, raph
https://golang.org/cl/
9425046