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+# 2025-02-18 Triage Log
+
+This week's results were dominated by the update to LLVM 20 ([#135763](https://github.com/rust-lang/rust/pull/135763)),
+which brought a large number of performance improvements, as usual. There were also two other
+significant improvements, caused by improving the representation of `const` values ([#136593](https://github.com/rust-lang/rust/pull/136593)) and doing less work when formatting in `rustdoc` ([#136828](https://github.com/rust-lang/rust/pull/136828)).
+
+Triage done by **@kobzol**.
+Revision range: [c03c38d5..ce36a966](https://perf.rust-lang.org/?start=c03c38d5c2368cd2aa0e056dba060b94fc747f4e&end=ce36a966c79e109dabeef7a47fe68e5294c6d71e&absolute=false&stat=instructions%3Au)
+
+**Summary**:
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:---------------:|:-----:|
+| Regressions ❌
(primary) | 4.4% | [0.2%, 35.8%] | 10 |
+| Regressions ❌
(secondary) | 1.2% | [0.2%, 5.0%] | 13 |
+| Improvements ✅
(primary) | -1.6% | [-10.5%, -0.2%] | 256 |
+| Improvements ✅
(secondary) | -1.0% | [-4.7%, -0.2%] | 163 |
+| All ❌✅ (primary) | -1.3% | [-10.5%, 35.8%] | 266 |
+
+
+3 Regressions, 2 Improvements, 4 Mixed; 4 of them in rollups
+50 artifact comparisons made in total
+
+#### Regressions
+
+Rollup of 8 pull requests [#136918](https://github.com/rust-lang/rust/pull/136918) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=021fb9c09a19d206a37226fe6168f1cc7c984925&end=552a959051cebf8f88a8f558399baf733bec9ce0&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:----:|:------------:|:-----:|
+| Regressions ❌
(primary) | 0.9% | [0.1%, 2.1%] | 19 |
+| Regressions ❌
(secondary) | 1.7% | [0.3%, 4.9%] | 9 |
+| Improvements ✅
(primary) | - | - | 0 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | 0.9% | [0.1%, 2.1%] | 19 |
+
+- Regression on a number of `doc` benchmarkes caused by [#136829](https://github.com/rust-lang/rust/pull/136829).
+- Continuing discussion on that PR, not marking as triaged yet.
+
+Rollup of 10 pull requests [#136943](https://github.com/rust-lang/rust/pull/136943) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=ced8e650cddbafad92094b2c89dee97b8a807d9c&end=ef148cd7eb00a5a973130dc6473da71fd6c487ee&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:----:|:------------:|:-----:|
+| Regressions ❌
(primary) | 0.2% | [0.2%, 0.2%] | 1 |
+| Regressions ❌
(secondary) | 0.6% | [0.4%, 0.7%] | 16 |
+| Improvements ✅
(primary) | - | - | 0 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | 0.2% | [0.2%, 0.2%] | 1 |
+
+- Small regression on a bunch of secondary benchmarks caused by [#136901](https://github.com/rust-lang/rust/pull/136901).
+- Does not seem worthy of further work.
+- Marked as triaged.
+
+Rollup of 11 pull requests [#137001](https://github.com/rust-lang/rust/pull/137001) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=a567209daab72b7ea59eac533278064396bb0534&end=6dfeab5c9e8a17a6636c1479037baabc4b1e9562&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:----:|:------------:|:-----:|
+| Regressions ❌
(primary) | 0.8% | [0.8%, 0.9%] | 2 |
+| Regressions ❌
(secondary) | 0.1% | [0.1%, 0.1%] | 2 |
+| Improvements ✅
(primary) | - | - | 0 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | 0.8% | [0.8%, 0.9%] | 2 |
+
+- A few small regressions were caused by [#136928](https://github.com/rust-lang/rust/pull/136928).
+- That PR was a fix and the regressions were small, so no further work is needed.
+- Marked as triaged.
+
+#### Improvements
+
+valtree performance tuning [#136593](https://github.com/rust-lang/rust/pull/136593) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=54cdc751df770517e70db0588573e32e6a7b9821&end=c241e146506600f5ab7f4026ff015df8a658400e&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | - | - | 0 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | -2.6% | [-5.6%, -0.2%] | 20 |
+| Improvements ✅
(secondary) | -0.3% | [-0.3%, -0.3%] | 1 |
+| All ❌✅ (primary) | -2.6% | [-5.6%, -0.2%] | 20 |
+
+- Resolves a previous perf. regression from https://github.com/rust-lang/rust/pull/136180, and then some.
+
+Do more lazy-formatting in librustdoc [#136828](https://github.com/rust-lang/rust/pull/136828) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=8c07d140e00dfa5b0988754051d07d8a91ff01f7&end=69fd5e4059f8840f09f60269bcda23dcdcb77151&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:---------------:|:-----:|
+| Regressions ❌
(primary) | - | - | 0 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | -1.6% | [-10.3%, -0.3%] | 17 |
+| Improvements ✅
(secondary) | -0.5% | [-0.7%, -0.2%] | 3 |
+| All ❌✅ (primary) | -1.6% | [-10.3%, -0.3%] | 17 |
+
+- A great win for doc benchmarks.
+
+#### Mixed
+
+Portable SIMD subtree update [#135701](https://github.com/rust-lang/rust/pull/135701) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=8c04e395952022a451138dc4dbead6dd6ae65203&end=4b293d99275cc63b07eec9e2de38f4b776989069&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | 0.5% | [0.5%, 0.5%] | 1 |
+| Regressions ❌
(secondary) | 0.3% | [0.1%, 0.6%] | 17 |
+| Improvements ✅
(primary) | - | - | 0 |
+| Improvements ✅
(secondary) | -0.4% | [-0.4%, -0.4%] | 2 |
+| All ❌✅ (primary) | 0.5% | [0.5%, 0.5%] | 1 |
+
+- Tiny regressions in doc builds, probably caused by more documentation in portable-simd.
+- Marked as triaged.
+
+transmute should also assume non-null pointers [#136735](https://github.com/rust-lang/rust/pull/136735) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=905b1bf1ccccaf091a880b069f80dc38ad9ecad3&end=d88ffcdb8bfc6f8b917574c1693eb9764a20eff5&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | 0.5% | [0.3%, 0.8%] | 4 |
+| Regressions ❌
(secondary) | 0.2% | [0.2%, 0.2%] | 1 |
+| Improvements ✅
(primary) | -0.5% | [-1.0%, -0.2%] | 7 |
+| Improvements ✅
(secondary) | -0.2% | [-0.2%, -0.2%] | 2 |
+| All ❌✅ (primary) | -0.2% | [-1.0%, 0.8%] | 11 |
+
+- Performance is a wash.
+- Marked as triaged.
+
+Rollup of 7 pull requests [#137163](https://github.com/rust-lang/rust/pull/137163) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=d5eb31c9347ae3c494c8d723711dacca7d1cfe8b&end=273465e1f2932a30a5b56ac95859cdc86f3f33fa&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | - | - | 0 |
+| Regressions ❌
(secondary) | 0.1% | [0.1%, 0.1%] | 1 |
+| Improvements ✅
(primary) | -0.3% | [-0.3%, -0.3%] | 2 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | -0.3% | [-0.3%, -0.3%] | 2 |
+
+- Three tiny changes, the only regression is on an incr-unchanged run of a parser stress test,
+ probably doesn't warrant further investigation.
+- Marked as triaged.
+
+Update to LLVM 20 [#135763](https://github.com/rust-lang/rust/pull/135763) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=2162e9d4b18525e4eb542fed9985921276512d7c&end=ce36a966c79e109dabeef7a47fe68e5294c6d71e&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | 5.1% | [0.2%, 35.1%] | 8 |
+| Regressions ❌
(secondary) | 0.7% | [0.4%, 1.0%] | 10 |
+| Improvements ✅
(primary) | -1.3% | [-4.2%, -0.2%] | 251 |
+| Improvements ✅
(secondary) | -1.0% | [-4.7%, -0.1%] | 178 |
+| All ❌✅ (primary) | -1.1% | [-4.2%, 35.1%] | 259 |
+
+- As usual, update to a new lLVM version brings a lot of performance wins, but also some regressions.
+- The single large regression was on a release (optimized) incremental build, which is not a
+configuration used much in practice. It was caused by a codegen unit becoming unnecessarily large.
+- Marked as triaged.