huff0: Use static decompression buffer up to 30% faster #499
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Skip zeroing stack and add a bigger reusable buffer: ``` benchmark old ns/op new ns/op delta BenchmarkDecompress4XNoTable/digits-32 200409 151974 -24.17% BenchmarkDecompress4XNoTable/gettysburg-32 2610 2565 -1.72% BenchmarkDecompress4XNoTable/twain-32 558870 532480 -4.72% BenchmarkDecompress4XNoTable/low-ent.10k-32 57291 53948 -5.84% BenchmarkDecompress4XNoTable/superlow-ent-10k-32 15556 14443 -7.15% BenchmarkDecompress4XNoTable/case1-32 296 257 -13.28% BenchmarkDecompress4XNoTable/case2-32 250 206 -17.27% BenchmarkDecompress4XNoTable/case3-32 257 217 -15.46% BenchmarkDecompress4XNoTable/pngdata.001-32 75101 73473 -2.17% BenchmarkDecompress4XNoTable/normcount2-32 414 319 -22.89% BenchmarkDecompress4XNoTableTableLog8/digits-32 200054 153302 -23.37% BenchmarkDecompress4XTable/digits-32 200226 152865 -23.65% BenchmarkDecompress4XTable/gettysburg-32 3815 3908 +2.44% BenchmarkDecompress4XTable/twain-32 557677 533928 -4.26% BenchmarkDecompress4XTable/low-ent.10k-32 57732 54737 -5.19% BenchmarkDecompress4XTable/superlow-ent-10k-32 16101 14918 -7.35% BenchmarkDecompress4XTable/case1-32 2035 2003 -1.57% BenchmarkDecompress4XTable/case2-32 2023 1962 -3.02% BenchmarkDecompress4XTable/case3-32 2036 1986 -2.46% BenchmarkDecompress4XTable/pngdata.001-32 78191 76109 -2.66% BenchmarkDecompress4XTable/normcount2-32 1454 1371 -5.71% benchmark old MB/s new MB/s speedup BenchmarkDecompress4XNoTable/digits-32 498.99 658.03 1.32x BenchmarkDecompress4XNoTable/gettysburg-32 593.10 603.62 1.02x BenchmarkDecompress4XNoTable/twain-32 469.06 492.31 1.05x BenchmarkDecompress4XNoTable/low-ent.10k-32 698.18 741.46 1.06x BenchmarkDecompress4XNoTable/superlow-ent-10k-32 674.99 726.98 1.08x BenchmarkDecompress4XNoTable/case1-32 185.82 214.27 1.15x BenchmarkDecompress4XNoTable/case2-32 180.33 218.02 1.21x BenchmarkDecompress4XNoTable/case3-32 186.94 221.15 1.18x BenchmarkDecompress4XNoTable/pngdata.001-32 681.75 696.85 1.02x BenchmarkDecompress4XNoTable/normcount2-32 210.23 272.66 1.30x BenchmarkDecompress4XNoTableTableLog8/digits-32 499.88 652.33 1.30x BenchmarkDecompress4XTable/digits-32 499.45 654.19 1.31x BenchmarkDecompress4XTable/gettysburg-32 405.81 396.10 0.98x BenchmarkDecompress4XTable/twain-32 470.06 490.97 1.04x BenchmarkDecompress4XTable/low-ent.10k-32 692.86 730.77 1.05x BenchmarkDecompress4XTable/superlow-ent-10k-32 652.15 703.85 1.08x BenchmarkDecompress4XTable/case1-32 27.02 27.46 1.02x BenchmarkDecompress4XTable/case2-32 22.24 22.94 1.03x BenchmarkDecompress4XTable/case3-32 23.58 24.17 1.03x BenchmarkDecompress4XTable/pngdata.001-32 654.81 672.72 1.03x BenchmarkDecompress4XTable/normcount2-32 59.83 63.47 1.06x ```
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Skip zeroing stack and add a bigger reusable buffer: