huff0: Improve 4X decompression speed 5-10% #437
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Significant degradations, abandoned. ``` λ benchcmp before.txt after.txt benchmark old ns/op new ns/op delta BenchmarkDecompress4XNoTable/digits-32 166962 183522 +9.92% BenchmarkDecompress4XNoTable/gettysburg-32 2747 2783 +1.31% BenchmarkDecompress4XNoTable/twain-32 579833 581783 +0.34% BenchmarkDecompress4XNoTable/low-ent.10k-32 56815 65143 +14.66% BenchmarkDecompress4XNoTable/superlow-ent-10k-32 15217 17399 +14.34% BenchmarkDecompress4XNoTable/case1-32 223 215 -3.63% BenchmarkDecompress4XNoTable/case2-32 178 173 -3.03% BenchmarkDecompress4XNoTable/case3-32 186 178 -4.10% BenchmarkDecompress4XNoTable/pngdata.001-32 78199 79470 +1.63% BenchmarkDecompress4XNoTable/normcount2-32 295 280 -5.22% BenchmarkDecompress4XTable/digits-32 169105 186653 +10.38% BenchmarkDecompress4XTable/gettysburg-32 4113 4243 +3.16% BenchmarkDecompress4XTable/twain-32 580482 589091 +1.48% BenchmarkDecompress4XTable/low-ent.10k-32 57488 66318 +15.36% BenchmarkDecompress4XTable/superlow-ent-10k-32 15801 18111 +14.62% BenchmarkDecompress4XTable/case1-32 2060 2062 +0.10% BenchmarkDecompress4XTable/case2-32 2004 2015 +0.55% BenchmarkDecompress4XTable/case3-32 2026 2040 +0.69% BenchmarkDecompress4XTable/pngdata.001-32 81603 83582 +2.43% BenchmarkDecompress4XTable/normcount2-32 1426 1401 -1.75% ```
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Visit https://dashboard.github.orijtech.com?back=0&pr=437&remote=false&repo=klauspost%2Fcompress to see benchmark details. |
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Tons of unrelated deltas in benchmark. The related ones are better, though, so not sure what to think. |
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Improve huffman 4X decompression speed for tablelog <= 8.