huff0: Assembler improvements #736
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Main changes: * Compute out[id * dstEvery + i] statically. This shaves four instructions off the main loops. (It also frees up a register.) * Track "exhausted" by addition instead or OR. This gets rid of an additional instruction. The variable is now also zeroed inside the loop as a dependency hint. Benchmark results show small speedups on some datasets: name old speed new speed delta Decompress1XTable/digits-8 350MB/s ± 0% 350MB/s ± 1% ~ (p=0.764 n=10+9) Decompress1XTable/gettysburg-8 270MB/s ± 1% 268MB/s ± 1% -0.72% (p=0.001 n=10+10) Decompress1XTable/twain-8 329MB/s ± 1% 328MB/s ± 0% ~ (p=0.035 n=10+9) Decompress1XTable/low-ent.10k-8 387MB/s ± 1% 386MB/s ± 0% ~ (p=0.027 n=10+8) Decompress1XTable/superlow-ent-10k-8 377MB/s ± 0% 375MB/s ± 0% -0.48% (p=0.000 n=10+10) Decompress1XTable/crash2-8 17.0MB/s ± 0% 16.9MB/s ± 0% -0.36% (p=0.004 n=9+10) Decompress1XTable/endzerobits-8 53.3MB/s ± 0% 53.0MB/s ± 0% -0.55% (p=0.000 n=10+9) Decompress1XTable/endnonzero-8 11.3MB/s ± 0% 11.3MB/s ± 1% ~ (p=0.060 n=10+10) Decompress1XTable/case1-8 22.0MB/s ± 0% 21.9MB/s ± 1% ~ (p=0.015 n=9+9) Decompress1XTable/case2-8 18.1MB/s ± 1% 18.1MB/s ± 1% ~ (p=0.202 n=10+9) Decompress1XTable/case3-8 19.1MB/s ± 1% 19.2MB/s ± 1% ~ (p=0.056 n=9+10) Decompress1XTable/pngdata.001-8 374MB/s ± 0% 374MB/s ± 0% ~ (p=0.148 n=10+10) Decompress1XTable/normcount2-8 54.4MB/s ± 1% 54.4MB/s ± 1% ~ (p=0.617 n=10+10) Decompress1XNoTable/digits/100-8 280MB/s ± 0% 280MB/s ± 1% ~ (p=0.951 n=9+10) Decompress1XNoTable/digits/10000-8 366MB/s ± 1% 367MB/s ± 0% ~ (p=0.090 n=10+9) Decompress1XNoTable/digits/262143-8 348MB/s ± 1% 349MB/s ± 0% ~ (p=0.043 n=10+10) Decompress1XNoTable/gettysburg/100-8 276MB/s ± 0% 277MB/s ± 1% +0.44% (p=0.009 n=10+10) Decompress1XNoTable/gettysburg/10000-8 363MB/s ± 1% 363MB/s ± 0% ~ (p=0.041 n=10+7) Decompress1XNoTable/gettysburg/262143-8 349MB/s ± 1% 350MB/s ± 0% ~ (p=0.123 n=10+10) Decompress1XNoTable/twain/100-8 267MB/s ± 0% 268MB/s ± 0% ~ (p=0.052 n=10+10) Decompress1XNoTable/twain/10000-8 357MB/s ± 3% 363MB/s ± 0% +1.74% (p=0.000 n=10+10) Decompress1XNoTable/twain/262143-8 320MB/s ± 2% 329MB/s ± 0% +3.09% (p=0.000 n=10+10) Decompress1XNoTable/low-ent.10k/100-8 183MB/s ± 1% 184MB/s ± 0% ~ (p=0.211 n=9+10) Decompress1XNoTable/low-ent.10k/10000-8 377MB/s ± 3% 385MB/s ± 1% +2.14% (p=0.000 n=10+10) Decompress1XNoTable/low-ent.10k/262143-8 386MB/s ± 1% 389MB/s ± 1% +0.84% (p=0.005 n=10+10) Decompress1XNoTable/superlow-ent-10k/262143-8 382MB/s ± 2% 389MB/s ± 1% +1.89% (p=0.001 n=10+10) Decompress1XNoTable/crash2/100-8 276MB/s ± 2% 278MB/s ± 0% ~ (p=0.180 n=10+8) Decompress1XNoTable/crash2/10000-8 373MB/s ± 1% 374MB/s ± 1% ~ (p=0.315 n=10+10) Decompress1XNoTable/crash2/262143-8 373MB/s ± 1% 375MB/s ± 0% ~ (p=0.165 n=10+8) Decompress1XNoTable/endzerobits/100-8 184MB/s ± 0% 184MB/s ± 1% ~ (p=0.845 n=9+9) Decompress1XNoTable/endzerobits/10000-8 384MB/s ± 1% 386MB/s ± 0% +0.61% (p=0.007 n=10+10) Decompress1XNoTable/endzerobits/262143-8 387MB/s ± 2% 389MB/s ± 0% ~ (p=0.963 n=9+8) Decompress1XNoTable/endnonzero/100-8 181MB/s ± 2% 183MB/s ± 0% ~ (p=0.017 n=9+10) Decompress1XNoTable/endnonzero/10000-8 385MB/s ± 0% 382MB/s ± 1% -0.88% (p=0.001 n=8+10) Decompress1XNoTable/endnonzero/262143-8 387MB/s ± 1% 385MB/s ± 2% ~ (p=0.143 n=10+10) Decompress1XNoTable/case1/100-8 278MB/s ± 2% 282MB/s ± 1% ~ (p=0.013 n=10+9) Decompress1XNoTable/case1/10000-8 373MB/s ± 1% 373MB/s ± 0% ~ (p=0.274 n=10+8) Decompress1XNoTable/case1/262143-8 374MB/s ± 1% 374MB/s ± 0% ~ (p=0.589 n=10+9) Decompress1XNoTable/case2/100-8 274MB/s ± 0% 274MB/s ± 0% -0.26% (p=0.002 n=10+9) Decompress1XNoTable/case2/10000-8 378MB/s ± 0% 377MB/s ± 0% ~ (p=0.093 n=10+10) Decompress1XNoTable/case2/262143-8 377MB/s ± 1% 376MB/s ± 1% ~ (p=0.225 n=10+10) Decompress1XNoTable/case3/100-8 266MB/s ± 0% 265MB/s ± 0% -0.20% (p=0.007 n=10+9) Decompress1XNoTable/case3/10000-8 371MB/s ± 0% 372MB/s ± 0% ~ (p=0.211 n=10+9) Decompress1XNoTable/case3/262143-8 373MB/s ± 0% 374MB/s ± 0% ~ (p=0.073 n=10+10) Decompress1XNoTable/pngdata.001/100-8 239MB/s ± 0% 239MB/s ± 0% ~ (p=0.889 n=9+10) Decompress1XNoTable/pngdata.001/10000-8 384MB/s ± 0% 384MB/s ± 0% ~ (p=0.228 n=10+8) Decompress1XNoTable/pngdata.001/262143-8 377MB/s ± 0% 379MB/s ± 0% +0.56% (p=0.000 n=10+10) Decompress1XNoTable/normcount2/100-8 281MB/s ± 1% 282MB/s ± 1% ~ (p=0.015 n=10+10) Decompress1XNoTable/normcount2/10000-8 368MB/s ± 0% 370MB/s ± 0% +0.37% (p=0.004 n=10+10) Decompress1XNoTable/normcount2/262143-8 371MB/s ± 0% 371MB/s ± 0% ~ (p=0.034 n=8+10) Decompress4XNoTable/digits/100-8 200MB/s ± 1% 201MB/s ± 0% ~ (p=0.274 n=8+10) Decompress4XNoTable/digits/10000-8 603MB/s ± 0% 622MB/s ± 1% +3.20% (p=0.000 n=8+10) Decompress4XNoTable/digits/262143-8 578MB/s ± 0% 595MB/s ± 1% +2.87% (p=0.000 n=8+10) Decompress4XNoTable/gettysburg/100-8 260MB/s ± 0% 260MB/s ± 1% ~ (p=0.011 n=8+10) Decompress4XNoTable/gettysburg/10000-8 643MB/s ± 0% 657MB/s ± 1% +2.19% (p=0.000 n=10+9) Decompress4XNoTable/gettysburg/262143-8 572MB/s ± 0% 589MB/s ± 0% +2.93% (p=0.000 n=8+10) Decompress4XNoTable/twain/100-8 206MB/s ± 1% 206MB/s ± 1% ~ (p=0.436 n=10+10) Decompress4XNoTable/twain/10000-8 639MB/s ± 1% 653MB/s ± 1% +2.25% (p=0.000 n=10+10) Decompress4XNoTable/twain/262143-8 516MB/s ± 0% 522MB/s ± 1% +1.09% (p=0.004 n=10+10) Decompress4XNoTable/low-ent.10k/100-8 207MB/s ± 1% 207MB/s ± 0% ~ (p=1.000 n=10+9) Decompress4XNoTable/low-ent.10k/10000-8 631MB/s ± 0% 653MB/s ± 0% +3.42% (p=0.000 n=10+9) Decompress4XNoTable/low-ent.10k/262143-8 685MB/s ± 1% 696MB/s ± 0% +1.61% (p=0.000 n=10+10) Decompress4XNoTable/superlow-ent-10k/262143-8 684MB/s ± 1% 695MB/s ± 1% +1.51% (p=0.000 n=9+10) Decompress4XNoTable/case1/100-8 208MB/s ± 1% 207MB/s ± 0% ~ (p=0.353 n=10+10) Decompress4XNoTable/case1/10000-8 601MB/s ± 0% 621MB/s ± 1% +3.22% (p=0.000 n=10+10) Decompress4XNoTable/case1/262143-8 613MB/s ± 1% 632MB/s ± 0% +3.14% (p=0.000 n=10+10) Decompress4XNoTable/case2/100-8 210MB/s ± 2% 208MB/s ± 2% ~ (p=0.315 n=10+9) Decompress4XNoTable/case2/10000-8 618MB/s ± 0% 636MB/s ± 0% +2.95% (p=0.000 n=10+10) Decompress4XNoTable/case2/262143-8 635MB/s ± 0% 651MB/s ± 0% +2.56% (p=0.000 n=7+10) Decompress4XNoTable/case3/100-8 199MB/s ± 1% 200MB/s ± 1% ~ (p=0.055 n=10+10) Decompress4XNoTable/case3/10000-8 615MB/s ± 0% 633MB/s ± 1% +2.94% (p=0.000 n=10+10) Decompress4XNoTable/case3/262143-8 620MB/s ± 0% 639MB/s ± 1% +3.00% (p=0.000 n=10+10) Decompress4XNoTable/pngdata.001/100-8 212MB/s ± 0% 211MB/s ± 1% ~ (p=0.211 n=10+9) Decompress4XNoTable/pngdata.001/10000-8 649MB/s ± 0% 667MB/s ± 1% +2.76% (p=0.000 n=10+10) Decompress4XNoTable/pngdata.001/262143-8 646MB/s ± 0% 660MB/s ± 0% +2.28% (p=0.000 n=9+10) Decompress4XNoTable/normcount2/100-8 261MB/s ± 1% 262MB/s ± 1% ~ (p=0.031 n=9+9) Decompress4XNoTable/normcount2/10000-8 589MB/s ± 1% 613MB/s ± 0% +3.99% (p=0.000 n=10+9) Decompress4XNoTable/normcount2/262143-8 585MB/s ± 3% 617MB/s ± 1% +5.57% (p=0.000 n=10+10) Decompress4XNoTableTableLog8/digits-8 579MB/s ± 2% 610MB/s ± 0% +5.33% (p=0.000 n=10+10) Decompress4XTable/digits-8 584MB/s ± 1% 607MB/s ± 1% +3.89% (p=0.000 n=10+10) Decompress4XTable/gettysburg-8 370MB/s ± 0% 373MB/s ± 1% +0.67% (p=0.009 n=10+10) Decompress4XTable/twain-8 512MB/s ± 2% 523MB/s ± 1% +2.08% (p=0.000 n=9+10) Decompress4XTable/low-ent.10k-8 656MB/s ± 1% 677MB/s ± 1% +3.21% (p=0.000 n=10+10) Decompress4XTable/superlow-ent-10k-8 603MB/s ± 4% 626MB/s ± 1% +3.91% (p=0.000 n=9+10) Decompress4XTable/case1-8 21.1MB/s ± 0% 21.0MB/s ± 0% -0.55% (p=0.000 n=9+9) Decompress4XTable/case2-8 17.6MB/s ± 0% 17.6MB/s ± 1% ~ (p=0.736 n=9+10) Decompress4XTable/case3-8 18.7MB/s ± 1% 18.7MB/s ± 1% ~ (p=0.642 n=10+10) Decompress4XTable/pngdata.001-8 648MB/s ± 0% 657MB/s ± 0% +1.50% (p=0.000 n=10+8) Decompress4XTable/normcount2-8 49.7MB/s ± 1% 49.7MB/s ± 1% ~ (p=0.839 n=10+10) [Geo mean] 271MB/s 274MB/s +0.96%
klauspost
approved these changes
Jan 9, 2023
|
@WojciechMula If you have the time to take a look that would be great. |
WojciechMula
approved these changes
Jan 9, 2023
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…7575) This PR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | [github.com/klauspost/compress](https://togithub.com/klauspost/compress) | indirect | patch | `v1.15.11` -> `v1.15.15` | --- ### Release Notes <details> <summary>klauspost/compress</summary> ### [`v1.15.15`](https://togithub.com/klauspost/compress/releases/tag/v1.15.15) [Compare Source](https://togithub.com/klauspost/compress/compare/v1.15.14...v1.15.15) ##### What's Changed - zstd: Add delta encoding support by [@​greatroar](https://togithub.com/greatroar) in [https://github.com/klauspost/compress/pull/728](https://togithub.com/klauspost/compress/pull/728) - huff0: Reduce bounds checking by [@​greatroar](https://togithub.com/greatroar) in [https://github.com/klauspost/compress/pull/734](https://togithub.com/klauspost/compress/pull/734) - huff0: Assembler improvements by [@​greatroar](https://togithub.com/greatroar) in [https://github.com/klauspost/compress/pull/736](https://togithub.com/klauspost/compress/pull/736) - deflate: Improve level 7-9 by [@​klauspost](https://togithub.com/klauspost) in [https://github.com/klauspost/compress/pull/739](https://togithub.com/klauspost/compress/pull/739) - gzhttp: Add SuffixETag() and DropETag() options to prevent ETag collisions on compressed responses by [@​willbicks](https://togithub.com/willbicks) in [https://github.com/klauspost/compress/pull/740](https://togithub.com/klauspost/compress/pull/740) - zstd: Don't allocate dataStorage when using byteBuf by [@​klauspost](https://togithub.com/klauspost) in [https://github.com/klauspost/compress/pull/741](https://togithub.com/klauspost/compress/pull/741) - huff0: Speed up compression of short blocks by [@​greatroar](https://togithub.com/greatroar) in [https://github.com/klauspost/compress/pull/744](https://togithub.com/klauspost/compress/pull/744) - zstd: Handle dicts by pointer, always by [@​greatroar](https://togithub.com/greatroar) in [https://github.com/klauspost/compress/pull/743](https://togithub.com/klauspost/compress/pull/743) - fse: Optimize compression by [@​greatroar](https://togithub.com/greatroar) in [https://github.com/klauspost/compress/pull/745](https://togithub.com/klauspost/compress/pull/745) - Retract v1.14.1-v.1.14.3 by [@​klauspost](https://togithub.com/klauspost) in [https://github.com/klauspost/compress/pull/742](https://togithub.com/klauspost/compress/pull/742) ##### New Contributors - [@​willbicks](https://togithub.com/willbicks) made their first contribution in [https://github.com/klauspost/compress/pull/740](https://togithub.com/klauspost/compress/pull/740) **Full Changelog**: klauspost/compress@v1.15.14...v1.15.15 ### [`v1.15.14`](https://togithub.com/klauspost/compress/releases/tag/v1.15.14) [Compare Source](https://togithub.com/klauspost/compress/compare/v1.15.13...v1.15.14) #### What's Changed - flate: Improve speed in big stateless blocks. by [@​klauspost](https://togithub.com/klauspost) in [https://github.com/klauspost/compress/pull/718](https://togithub.com/klauspost/compress/pull/718) - zstd: Trigger BCE by switching on lengths by [@​greatroar](https://togithub.com/greatroar) in [https://github.com/klauspost/compress/pull/716](https://togithub.com/klauspost/compress/pull/716) - zstd: Shave some instructions off the amd64 asm by [@​greatroar](https://togithub.com/greatroar) in [https://github.com/klauspost/compress/pull/720](https://togithub.com/klauspost/compress/pull/720) - export NoGzipResponseWriter for custom ResponseWriter wrappers by [@​harshavardhana](https://togithub.com/harshavardhana) in [https://github.com/klauspost/compress/pull/722](https://togithub.com/klauspost/compress/pull/722) - s2: Add example for indexing and existing stream by [@​klauspost](https://togithub.com/klauspost) in [https://github.com/klauspost/compress/pull/723](https://togithub.com/klauspost/compress/pull/723) - tests: Tweak fuzz tests by [@​klauspost](https://togithub.com/klauspost) in [https://github.com/klauspost/compress/pull/719](https://togithub.com/klauspost/compress/pull/719) #### New Contributors - [@​harshavardhana](https://togithub.com/harshavardhana) made their first contribution in [https://github.com/klauspost/compress/pull/722](https://togithub.com/klauspost/compress/pull/722) **Full Changelog**: klauspost/compress@v1.15.13...v1.15.14 ### [`v1.15.13`](https://togithub.com/klauspost/compress/releases/tag/v1.15.13) [Compare Source](https://togithub.com/klauspost/compress/compare/v1.15.12...v1.15.13) #### What's Changed - zstd: Add MaxEncodedSize to encoder by [@​klauspost](https://togithub.com/klauspost) in [https://github.com/klauspost/compress/pull/691](https://togithub.com/klauspost/compress/pull/691) - zstd: Improve "best" end search by [@​klauspost](https://togithub.com/klauspost) in [https://github.com/klauspost/compress/pull/693](https://togithub.com/klauspost/compress/pull/693) - zstd: Replace bytes.Equal with smaller comparisons by [@​greatroar](https://togithub.com/greatroar) in [https://github.com/klauspost/compress/pull/695](https://togithub.com/klauspost/compress/pull/695) - zstd: Faster CRC checking/skipping by [@​greatroar](https://togithub.com/greatroar) in [https://github.com/klauspost/compress/pull/696](https://togithub.com/klauspost/compress/pull/696) - zstd: Rewrite matchLen to make it inlineable by [@​greatroar](https://togithub.com/greatroar) in [https://github.com/klauspost/compress/pull/701](https://togithub.com/klauspost/compress/pull/701) - zstd: Write table clearing in a way that the compiler recognizes by [@​greatroar](https://togithub.com/greatroar) in [https://github.com/klauspost/compress/pull/702](https://togithub.com/klauspost/compress/pull/702) - zstd: Use individual reset threshold by [@​klauspost](https://togithub.com/klauspost) in [https://github.com/klauspost/compress/pull/703](https://togithub.com/klauspost/compress/pull/703) - huff0: Check for zeros earlier in Scratch.countSimple by [@​greatroar](https://togithub.com/greatroar) in [https://github.com/klauspost/compress/pull/704](https://togithub.com/klauspost/compress/pull/704) - zstd: Improve best compression's match selection by [@​greatroar](https://togithub.com/greatroar) in [https://github.com/klauspost/compress/pull/705](https://togithub.com/klauspost/compress/pull/705) - zstd: Select best match using selection trees by [@​greatroar](https://togithub.com/greatroar) in [https://github.com/klauspost/compress/pull/706](https://togithub.com/klauspost/compress/pull/706) - zstd: sync xxhash with final accepted patch upstream by [@​lizthegrey](https://togithub.com/lizthegrey) in [https://github.com/klauspost/compress/pull/707](https://togithub.com/klauspost/compress/pull/707) - zstd: Import xxhash v2.2.0 by [@​greatroar](https://togithub.com/greatroar) in [https://github.com/klauspost/compress/pull/708](https://togithub.com/klauspost/compress/pull/708) **Full Changelog**: klauspost/compress@v1.15.12...v1.15.13 ### [`v1.15.12`](https://togithub.com/klauspost/compress/releases/tag/v1.15.12) [Compare Source](https://togithub.com/klauspost/compress/compare/v1.15.11...v1.15.12) ##### What's Changed - zstd: Tweak decoder allocs. by [@​klauspost](https://togithub.com/klauspost) in [https://github.com/klauspost/compress/pull/680](https://togithub.com/klauspost/compress/pull/680) - gzhttp: Always delete `HeaderNoCompression` by [@​klauspost](https://togithub.com/klauspost) in [https://github.com/klauspost/compress/pull/683](https://togithub.com/klauspost/compress/pull/683) **Full Changelog**: klauspost/compress@v1.15.11...v1.15.12 </details> --- ### Configuration 📅 **Schedule**: Branch creation - "before 3am on the first day of the month" (UTC), Automerge - At any time (no schedule defined). 🚦 **Automerge**: Disabled by config. 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This PR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | [github.com/klauspost/compress](https://togithub.com/klauspost/compress) | indirect | minor | `v1.15.11` -> `v1.16.0` | --- ### ⚠ Dependency Lookup Warnings ⚠ Warnings were logged while processing this repo. Please check the Dependency Dashboard for more information. --- ### Release Notes <details> <summary>klauspost/compress</summary> ### [`v1.16.0`](https://togithub.com/klauspost/compress/releases/tag/v1.16.0) [Compare Source](https://togithub.com/klauspost/compress/compare/v1.15.15...v1.16.0) #### What's Changed - s2: Add Dictionary support by [@​klauspost](https://togithub.com/klauspost) in [https://github.com/klauspost/compress/pull/685](https://togithub.com/klauspost/compress/pull/685) - s2: Add Compression Size Estimate by [@​klauspost](https://togithub.com/klauspost) in [https://github.com/klauspost/compress/pull/752](https://togithub.com/klauspost/compress/pull/752) - s2: Add support for custom stream encoder by [@​klauspost](https://togithub.com/klauspost) in [https://github.com/klauspost/compress/pull/755](https://togithub.com/klauspost/compress/pull/755) - s2: Add LZ4 block converter by [@​klauspost](https://togithub.com/klauspost) in [https://github.com/klauspost/compress/pull/748](https://togithub.com/klauspost/compress/pull/748) - s2: Support io.ReaderAt in ReadSeeker by [@​klauspost](https://togithub.com/klauspost) in [https://github.com/klauspost/compress/pull/747](https://togithub.com/klauspost/compress/pull/747) - s2c/s2sx: Use concurrent decoding by [@​klauspost](https://togithub.com/klauspost) in [https://github.com/klauspost/compress/pull/746](https://togithub.com/klauspost/compress/pull/746) - tests: Upgrade to Go 1.20 by [@​klauspost](https://togithub.com/klauspost) in [https://github.com/klauspost/compress/pull/749](https://togithub.com/klauspost/compress/pull/749) - Update all (command) dependencies by [@​klauspost](https://togithub.com/klauspost) in [https://github.com/klauspost/compress/pull/758](https://togithub.com/klauspost/compress/pull/758) **Full Changelog**: klauspost/compress@v1.15.15...v1.16.0 ### [`v1.15.15`](https://togithub.com/klauspost/compress/releases/tag/v1.15.15) [Compare Source](https://togithub.com/klauspost/compress/compare/v1.15.14...v1.15.15) #### What's Changed - zstd: Add delta encoding support by [@​greatroar](https://togithub.com/greatroar) in [https://github.com/klauspost/compress/pull/728](https://togithub.com/klauspost/compress/pull/728) - huff0: Reduce bounds checking by [@​greatroar](https://togithub.com/greatroar) in [https://github.com/klauspost/compress/pull/734](https://togithub.com/klauspost/compress/pull/734) - huff0: Assembler improvements by [@​greatroar](https://togithub.com/greatroar) in [https://github.com/klauspost/compress/pull/736](https://togithub.com/klauspost/compress/pull/736) - deflate: Improve level 7-9 by [@​klauspost](https://togithub.com/klauspost) in [https://github.com/klauspost/compress/pull/739](https://togithub.com/klauspost/compress/pull/739) - gzhttp: Add SuffixETag() and DropETag() options to prevent ETag collisions on compressed responses by [@​willbicks](https://togithub.com/willbicks) in [https://github.com/klauspost/compress/pull/740](https://togithub.com/klauspost/compress/pull/740) - zstd: Don't allocate dataStorage when using byteBuf by [@​klauspost](https://togithub.com/klauspost) in [https://github.com/klauspost/compress/pull/741](https://togithub.com/klauspost/compress/pull/741) - huff0: Speed up compression of short blocks by [@​greatroar](https://togithub.com/greatroar) in [https://github.com/klauspost/compress/pull/744](https://togithub.com/klauspost/compress/pull/744) - zstd: Handle dicts by pointer, always by [@​greatroar](https://togithub.com/greatroar) in [https://github.com/klauspost/compress/pull/743](https://togithub.com/klauspost/compress/pull/743) - fse: Optimize compression by [@​greatroar](https://togithub.com/greatroar) in [https://github.com/klauspost/compress/pull/745](https://togithub.com/klauspost/compress/pull/745) - Retract v1.14.1-v.1.14.3 by [@​klauspost](https://togithub.com/klauspost) in [https://github.com/klauspost/compress/pull/742](https://togithub.com/klauspost/compress/pull/742) #### New Contributors - [@​willbicks](https://togithub.com/willbicks) made their first contribution in [https://github.com/klauspost/compress/pull/740](https://togithub.com/klauspost/compress/pull/740) **Full Changelog**: klauspost/compress@v1.15.14...v1.15.15 ### [`v1.15.14`](https://togithub.com/klauspost/compress/releases/tag/v1.15.14) [Compare Source](https://togithub.com/klauspost/compress/compare/v1.15.13...v1.15.14) #### What's Changed - flate: Improve speed in big stateless blocks. by [@​klauspost](https://togithub.com/klauspost) in [https://github.com/klauspost/compress/pull/718](https://togithub.com/klauspost/compress/pull/718) - zstd: Trigger BCE by switching on lengths by [@​greatroar](https://togithub.com/greatroar) in [https://github.com/klauspost/compress/pull/716](https://togithub.com/klauspost/compress/pull/716) - zstd: Shave some instructions off the amd64 asm by [@​greatroar](https://togithub.com/greatroar) in [https://github.com/klauspost/compress/pull/720](https://togithub.com/klauspost/compress/pull/720) - export NoGzipResponseWriter for custom ResponseWriter wrappers by [@​harshavardhana](https://togithub.com/harshavardhana) in [https://github.com/klauspost/compress/pull/722](https://togithub.com/klauspost/compress/pull/722) - s2: Add example for indexing and existing stream by [@​klauspost](https://togithub.com/klauspost) in [https://github.com/klauspost/compress/pull/723](https://togithub.com/klauspost/compress/pull/723) - tests: Tweak fuzz tests by [@​klauspost](https://togithub.com/klauspost) in [https://github.com/klauspost/compress/pull/719](https://togithub.com/klauspost/compress/pull/719) #### New Contributors - [@​harshavardhana](https://togithub.com/harshavardhana) made their first contribution in [https://github.com/klauspost/compress/pull/722](https://togithub.com/klauspost/compress/pull/722) **Full Changelog**: klauspost/compress@v1.15.13...v1.15.14 ### [`v1.15.13`](https://togithub.com/klauspost/compress/releases/tag/v1.15.13) [Compare Source](https://togithub.com/klauspost/compress/compare/v1.15.12...v1.15.13) #### What's Changed - zstd: Add MaxEncodedSize to encoder by [@​klauspost](https://togithub.com/klauspost) in [https://github.com/klauspost/compress/pull/691](https://togithub.com/klauspost/compress/pull/691) - zstd: Improve "best" end search by [@​klauspost](https://togithub.com/klauspost) in [https://github.com/klauspost/compress/pull/693](https://togithub.com/klauspost/compress/pull/693) - zstd: Replace bytes.Equal with smaller comparisons by [@​greatroar](https://togithub.com/greatroar) in [https://github.com/klauspost/compress/pull/695](https://togithub.com/klauspost/compress/pull/695) - zstd: Faster CRC checking/skipping by [@​greatroar](https://togithub.com/greatroar) in [https://github.com/klauspost/compress/pull/696](https://togithub.com/klauspost/compress/pull/696) - zstd: Rewrite matchLen to make it inlineable by [@​greatroar](https://togithub.com/greatroar) in [https://github.com/klauspost/compress/pull/701](https://togithub.com/klauspost/compress/pull/701) - zstd: Write table clearing in a way that the compiler recognizes by [@​greatroar](https://togithub.com/greatroar) in [https://github.com/klauspost/compress/pull/702](https://togithub.com/klauspost/compress/pull/702) - zstd: Use individual reset threshold by [@​klauspost](https://togithub.com/klauspost) in [https://github.com/klauspost/compress/pull/703](https://togithub.com/klauspost/compress/pull/703) - huff0: Check for zeros earlier in Scratch.countSimple by [@​greatroar](https://togithub.com/greatroar) in [https://github.com/klauspost/compress/pull/704](https://togithub.com/klauspost/compress/pull/704) - zstd: Improve best compression's match selection by [@​greatroar](https://togithub.com/greatroar) in [https://github.com/klauspost/compress/pull/705](https://togithub.com/klauspost/compress/pull/705) - zstd: Select best match using selection trees by [@​greatroar](https://togithub.com/greatroar) in [https://github.com/klauspost/compress/pull/706](https://togithub.com/klauspost/compress/pull/706) - zstd: sync xxhash with final accepted patch upstream by [@​lizthegrey](https://togithub.com/lizthegrey) in [https://github.com/klauspost/compress/pull/707](https://togithub.com/klauspost/compress/pull/707) - zstd: Import xxhash v2.2.0 by [@​greatroar](https://togithub.com/greatroar) in [https://github.com/klauspost/compress/pull/708](https://togithub.com/klauspost/compress/pull/708) **Full Changelog**: klauspost/compress@v1.15.12...v1.15.13 ### [`v1.15.12`](https://togithub.com/klauspost/compress/releases/tag/v1.15.12) [Compare Source](https://togithub.com/klauspost/compress/compare/v1.15.11...v1.15.12) #### What's Changed - zstd: Tweak decoder allocs. by [@​klauspost](https://togithub.com/klauspost) in [https://github.com/klauspost/compress/pull/680](https://togithub.com/klauspost/compress/pull/680) - gzhttp: Always delete `HeaderNoCompression` by [@​klauspost](https://togithub.com/klauspost) in [https://github.com/klauspost/compress/pull/683](https://togithub.com/klauspost/compress/pull/683) **Full Changelog**: klauspost/compress@v1.15.11...v1.15.12 </details> --- ### Configuration 📅 **Schedule**: Branch creation - "before 3am on the first day of the month" (UTC), Automerge - At any time (no schedule defined). 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about this update again. --- - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box --- This PR has been generated by [Renovate Bot](https://togithub.com/renovatebot/renovate). <!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNC4xMDkuMSIsInVwZGF0ZWRJblZlciI6IjM0LjE1NC4wIn0=-->
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Main changes:
Compute out[id * dstEvery + i] statically. This shaves four instructions off the main loops. (It also frees up a register.)
Track "exhausted" by addition instead or OR. This gets rid of an additional instruction. The variable is now also zeroed inside the loop as a dependency hint.
Benchmark results show small speedups on some datasets: