mirror of https://github.com/golang/go.git
60ffae25bc
The bulk of the gains come from hoisting the modulo ops outside of the inner loop. Reducing the digest type from 8 bytes to 4 bytes gains another 1% on the hash/adler32 micro-benchmark. Benchmarks for $GOOS,$GOARCH = linux,amd64 below. hash/adler32 benchmark: benchmark old ns/op new ns/op delta BenchmarkAdler32KB 1660 1364 -17.83% image/png benchmark: benchmark old ns/op new ns/op delta BenchmarkDecodeGray 2466909 2425539 -1.68% BenchmarkDecodeNRGBAGradient 9884500 9751705 -1.34% BenchmarkDecodeNRGBAOpaque 8511615 8379800 -1.55% BenchmarkDecodePaletted 1366683 1330677 -2.63% BenchmarkDecodeRGB 6987496 6884974 -1.47% BenchmarkEncodePaletted 6292408 6040052 -4.01% BenchmarkEncodeRGBOpaque 19780680 19178440 -3.04% BenchmarkEncodeRGBA 80738600 79076800 -2.06% Wall time for Denis Cheremisov's PNG-decoding program given in https://groups.google.com/group/golang-nuts/browse_thread/thread/22aa8a05040fdd49 Before: 2.44s After: 2.26s Delta: -7% R=rsc CC=golang-dev https://golang.org/cl/6251044 |
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