inflate: Limit variable shifts #274
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Use and operations to speed up variable shifts. Faster on AMD64: ``` benchmark old ns/op new ns/op delta BenchmarkDecodeDigitsSpeed1e4-32 57027 56892 -0.24% BenchmarkDecodeDigitsSpeed1e5-32 657866 650408 -1.13% BenchmarkDecodeDigitsSpeed1e6-32 6679774 6425893 -3.80% BenchmarkDecodeDigitsDefault1e4-32 62810 61858 -1.52% BenchmarkDecodeDigitsDefault1e5-32 657865 628677 -4.44% BenchmarkDecodeDigitsDefault1e6-32 6486343 6211232 -4.24% BenchmarkDecodeDigitsCompress1e4-32 62169 61555 -0.99% BenchmarkDecodeDigitsCompress1e5-32 677789 668714 -1.34% BenchmarkDecodeDigitsCompress1e6-32 6851431 6685226 -2.43% BenchmarkDecodeTwainSpeed1e4-32 60606 59003 -2.64% BenchmarkDecodeTwainSpeed1e5-32 628151 609357 -2.99% BenchmarkDecodeTwainSpeed1e6-32 6238098 6015035 -3.58% BenchmarkDecodeTwainDefault1e4-32 59901 59167 -1.23% BenchmarkDecodeTwainDefault1e5-32 576772 561311 -2.68% BenchmarkDecodeTwainDefault1e6-32 5701418 5479259 -3.90% BenchmarkDecodeTwainCompress1e4-32 58582 56825 -3.00% BenchmarkDecodeTwainCompress1e5-32 535572 515826 -3.69% BenchmarkDecodeTwainCompress1e6-32 5265486 5090632 -3.32% BenchmarkDecodeRandomSpeed1e4-32 323 319 -1.24% BenchmarkDecodeRandomSpeed1e5-32 1954 1945 -0.46% BenchmarkDecodeRandomSpeed1e6-32 20016 20026 +0.05% benchmark old MB/s new MB/s speedup BenchmarkDecodeDigitsSpeed1e4-32 175.35 175.77 1.00x BenchmarkDecodeDigitsSpeed1e5-32 152.01 153.75 1.01x BenchmarkDecodeDigitsSpeed1e6-32 149.71 155.62 1.04x BenchmarkDecodeDigitsDefault1e4-32 159.21 161.66 1.02x BenchmarkDecodeDigitsDefault1e5-32 152.01 159.06 1.05x BenchmarkDecodeDigitsDefault1e6-32 154.17 161.00 1.04x BenchmarkDecodeDigitsCompress1e4-32 160.85 162.46 1.01x BenchmarkDecodeDigitsCompress1e5-32 147.54 149.54 1.01x BenchmarkDecodeDigitsCompress1e6-32 145.95 149.58 1.02x BenchmarkDecodeTwainSpeed1e4-32 165.00 169.48 1.03x BenchmarkDecodeTwainSpeed1e5-32 159.20 164.11 1.03x BenchmarkDecodeTwainSpeed1e6-32 160.31 166.25 1.04x BenchmarkDecodeTwainDefault1e4-32 166.94 169.01 1.01x BenchmarkDecodeTwainDefault1e5-32 173.38 178.15 1.03x BenchmarkDecodeTwainDefault1e6-32 175.39 182.51 1.04x BenchmarkDecodeTwainCompress1e4-32 170.70 175.98 1.03x BenchmarkDecodeTwainCompress1e5-32 186.72 193.86 1.04x BenchmarkDecodeTwainCompress1e6-32 189.92 196.44 1.03x BenchmarkDecodeRandomSpeed1e4-32 30915.66 31375.28 1.01x BenchmarkDecodeRandomSpeed1e5-32 51177.19 51408.19 1.00x BenchmarkDecodeRandomSpeed1e6-32 49958.99 49936.11 1.00x ```
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Could be refined, but better for now. |
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Use and operations to speed up variable shifts.
Faster on AMD64: