huff0: Reduce bounds checking #734
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Apparently, Go 1.19 understands that v := b.in[b.off-4 : b.off] has length four, but then inserts an additional check for v = v[:4]. Removing the latter ensures the comments saying "2 bounds checks" are correct again (two checks in a single line).
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Great! Not sure if this is a compiler regression. Benchmarks are neutral as is pretty common with bounds check removal. Using Variations are likely just noise or random compiler changes. |
klauspost
approved these changes
Jan 7, 2023
kodiakhq bot
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Feb 1, 2023
…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. 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:eyJjcmVhdGVkSW5WZXIiOiIzNC4xMDkuMSIsInVwZGF0ZWRJblZlciI6IjM0LjEwOS4xIn0=-->
kodiakhq bot
referenced
this pull request
in cloudquery/filetypes
Mar 1, 2023
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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Apparently, Go 1.19 understands that v := b.in[b.off-4 : b.off] has length four, but then inserts an additional check for v = v[:4]. Removing the latter ensures the comments saying "2 bounds checks" are correct again (two checks in a single line).