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Part 1 of optimizing the deflater. This optimizes the bitwriter by: * Removing allocations. * Storing compound values for bit codes instead of 2 separate tables. * Accumulate 48 bits between writes instead of 24. * Inline bit flushing. This also contains code that will be used in later CL's (writeBlockDynamic, writeBlockHuff). Tests for Huffman bit writer encoding regressions has been added. name old speed new speed delta EncodeDigitsSpeed1e4-4 19.3MB/s ± 1% 21.6MB/s ± 1% +11.77% EncodeDigitsSpeed1e5-4 25.0MB/s ± 6% 30.7MB/s ± 1% +22.70% EncodeDigitsSpeed1e6-4 28.2MB/s ± 1% 32.3MB/s ± 1% +14.64% EncodeDigitsDefault1e4-4 13.3MB/s ± 0% 14.2MB/s ± 1% +7.07% EncodeDigitsDefault1e5-4 6.43MB/s ± 1% 6.64MB/s ± 1% +3.27% EncodeDigitsDefault1e6-4 5.81MB/s ± 0% 5.85MB/s ± 1% +0.69% EncodeDigitsCompress1e4-4 13.2MB/s ± 0% 14.4MB/s ± 0% +9.10% EncodeDigitsCompress1e5-4 6.40MB/s ± 1% 6.61MB/s ± 0% +3.20% EncodeDigitsCompress1e6-4 5.80MB/s ± 1% 5.90MB/s ± 1% +1.64% EncodeTwainSpeed1e4-4 18.4MB/s ± 1% 20.7MB/s ± 1% +12.72% EncodeTwainSpeed1e5-4 27.7MB/s ± 1% 31.0MB/s ± 1% +11.78% EncodeTwainSpeed1e6-4 29.1MB/s ± 0% 32.9MB/s ± 2% +13.25% EncodeTwainDefault1e4-4 12.4MB/s ± 0% 13.1MB/s ± 1% +5.88% EncodeTwainDefault1e5-4 7.52MB/s ± 1% 7.83MB/s ± 0% +4.19% EncodeTwainDefault1e6-4 7.08MB/s ± 1% 7.26MB/s ± 0% +2.54% EncodeTwainCompress1e4-4 12.0MB/s ± 1% 12.8MB/s ± 1% +6.70% EncodeTwainCompress1e5-4 5.96MB/s ± 1% 6.16MB/s ± 0% +3.27% EncodeTwainCompress1e6-4 5.37MB/s ± 0% 5.39MB/s ± 1% +0.47% >Allocations: benchmark old allocs new allocs delta BenchmarkEncodeDigitsSpeed1e4-4 50 0 -100.00% BenchmarkEncodeDigitsSpeed1e5-4 110 0 -100.00% BenchmarkEncodeDigitsSpeed1e6-4 1032 0 -100.00% BenchmarkEncodeDigitsDefault1e4-4 56 0 -100.00% BenchmarkEncodeDigitsDefault1e5-4 120 0 -100.00% BenchmarkEncodeDigitsDefault1e6-4 966 0 -100.00% BenchmarkEncodeDigitsCompress1e4-4 56 0 -100.00% BenchmarkEncodeDigitsCompress1e5-4 120 0 -100.00% BenchmarkEncodeDigitsCompress1e6-4 966 0 -100.00% BenchmarkEncodeTwainSpeed1e4-4 58 0 -100.00% BenchmarkEncodeTwainSpeed1e5-4 132 0 -100.00% BenchmarkEncodeTwainSpeed1e6-4 1082 0 -100.00% BenchmarkEncodeTwainDefault1e4-4 52 0 -100.00% BenchmarkEncodeTwainDefault1e5-4 126 0 -100.00% BenchmarkEncodeTwainDefault1e6-4 886 0 -100.00% BenchmarkEncodeTwainCompress1e4-4 52 0 -100.00% BenchmarkEncodeTwainCompress1e5-4 120 0 -100.00% BenchmarkEncodeTwainCompress1e6-4 880 0 -100.00% benchmark old bytes new bytes delta BenchmarkEncodeDigitsSpeed1e4-4 4288 2 -99.95% BenchmarkEncodeDigitsSpeed1e5-4 8896 15 -99.83% BenchmarkEncodeDigitsSpeed1e6-4 84098 153 -99.82% BenchmarkEncodeDigitsDefault1e4-4 4480 3 -99.93% BenchmarkEncodeDigitsDefault1e5-4 9216 76 -99.18% BenchmarkEncodeDigitsDefault1e6-4 73920 768 -98.96% BenchmarkEncodeDigitsCompress1e4-4 4480 3 -99.93% BenchmarkEncodeDigitsCompress1e5-4 9216 76 -99.18% BenchmarkEncodeDigitsCompress1e6-4 73920 768 -98.96% BenchmarkEncodeTwainSpeed1e4-4 4544 2 -99.96% BenchmarkEncodeTwainSpeed1e5-4 9600 15 -99.84% BenchmarkEncodeTwainSpeed1e6-4 77633 153 -99.80% BenchmarkEncodeTwainDefault1e4-4 4352 3 -99.93% BenchmarkEncodeTwainDefault1e5-4 9408 76 -99.19% BenchmarkEncodeTwainDefault1e6-4 65984 768 -98.84% BenchmarkEncodeTwainCompress1e4-4 4352 3 -99.93% BenchmarkEncodeTwainCompress1e5-4 9216 76 -99.18% BenchmarkEncodeTwainCompress1e6-4 65792 768 -98.83% Updates #14258 Change-Id: Ibaa97b9619743ad623094727228eb2ada1ec7f1f Reviewed-on: https://go-review.googlesource.com/19336 Reviewed-by: Nigel Tao <nigeltao@golang.org> Reviewed-by: Joe Tsai <joetsai@digital-static.net> Run-TryBot: Joe Tsai <joetsai@digital-static.net> TryBot-Result: Gobot Gobot <gobot@golang.org>