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+# 2025-10-13 Triage Log
+
+This week saw small wins across the board from some microoptimizations of the incremental query
+system ([#147423](https://github.com/rust-lang/rust/pull/147423)). There have also been a couple of
+regressions. [#142390](https://github.com/rust-lang/rust/pull/142390) introduced regressions of `check`
+builds across the board. The largest regression (18%) is from an incremental opt build of a secondary
+artificial stress test, so we deemed it acceptable.
+
+Triage done by **@kobzol**.
+Revision range: [1a3cdd34..956f47c3](https://perf.rust-lang.org/?start=1a3cdd34629306fa67624eaa60d73687e7fcf855&end=956f47c32f1bd97b22cd702d7ccf78f0f0d42c34&absolute=false&stat=instructions%3Au)
+
+**Summary**:
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | 0.7% | [0.1%, 2.0%] | 65 |
+| Regressions ❌
(secondary) | 0.8% | [0.1%, 18.6%] | 65 |
+| Improvements ✅
(primary) | -0.6% | [-1.6%, -0.1%] | 119 |
+| Improvements ✅
(secondary) | -0.4% | [-1.6%, -0.1%] | 76 |
+| All ❌✅ (primary) | -0.1% | [-1.6%, 2.0%] | 184 |
+
+
+2 Regressions, 7 Improvements, 3 Mixed; 3 of them in rollups
+35 artifact comparisons made in total
+
+#### Regressions
+
+Rollup of 12 pull requests [#147512](https://github.com/rust-lang/rust/pull/147512) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=bd3487101ff9397ca8a54dd83aa360d93342b82e&end=acf243778e6c54cb7d54bee4be88e510e4be123e&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:----:|:------------:|:-----:|
+| Regressions ❌
(primary) | - | - | 0 |
+| Regressions ❌
(secondary) | 0.4% | [0.0%, 0.8%] | 10 |
+| Improvements ✅
(primary) | - | - | 0 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | - | - | 0 |
+
+- Noise, the secondary benchmarks have rebounded in [#147519](https://github.com/rust-lang/rust/pull/147519).
+- Marked as triaged.
+
+Fix normalization overflow ICEs in monomorphization [#146096](https://github.com/rust-lang/rust/pull/146096) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=2300c2aef7dbc2a7bbbeaa9894d07d459abd9bc6&end=36e4f5d1fe1d63953a5bf1758ce2b64172623e2e&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:----:|:-------------:|:-----:|
+| Regressions ❌
(primary) | 0.4% | [0.2%, 0.6%] | 5 |
+| Regressions ❌
(secondary) | 9.7% | [0.7%, 18.7%] | 2 |
+| Improvements ✅
(primary) | - | - | 0 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | 0.4% | [0.2%, 0.6%] | 5 |
+
+- The perf. hit was expected and deemed worth it, as this PR fixes a couple of issues.
+- Apart from some tiny regressions, the single large regression is in a secondary stress test, and also in full incremental opt build.
+- Marked as triaged.
+
+#### Improvements
+
+Rollup of 7 pull requests [#147449](https://github.com/rust-lang/rust/pull/147449) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=fed46ffd5059e11669df1bd9406b02914c3fb73f&end=d62f33a7c684473bf6efa2f3ff57093bb8986141&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | - | - | 0 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | -0.2% | [-0.3%, -0.1%] | 8 |
+| Improvements ✅
(secondary) | -0.5% | [-0.5%, -0.5%] | 1 |
+| All ❌✅ (primary) | -0.2% | [-0.3%, -0.1%] | 8 |
+
+
+`DepNodeColor` tweaks [#147423](https://github.com/rust-lang/rust/pull/147423) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=4fd31815524baba0bf368f151f757101f432e3de&end=5767910cbcc9d199bf261a468574d45aa3857599&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | - | - | 0 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | -0.6% | [-1.5%, -0.2%] | 98 |
+| Improvements ✅
(secondary) | -0.6% | [-1.2%, -0.1%] | 47 |
+| All ❌✅ (primary) | -0.6% | [-1.5%, -0.2%] | 98 |
+
+
+[rustdoc] a small performance improvement: only allocate new string if there are DOS backlines in highlight.rs [#147443](https://github.com/rust-lang/rust/pull/147443) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=82224f6891c7e7aa0c6c865aa825100b3ea2d0fb&end=910617d84d611e9ba508fd57a058c59b8a767697&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | - | - | 0 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | -0.2% | [-0.3%, -0.1%] | 4 |
+| Improvements ✅
(secondary) | -0.2% | [-0.5%, -0.0%] | 5 |
+| All ❌✅ (primary) | -0.2% | [-0.3%, -0.1%] | 4 |
+
+
+Refactor AddCallGuards in two loops. [#147477](https://github.com/rust-lang/rust/pull/147477) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=b6f0945e4681bc4d2faa7c22c5f61dc36abf7dd2&end=61efd190243db101d1e47c82c7ec543565c25f62&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | - | - | 0 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | -0.2% | [-0.3%, -0.1%] | 8 |
+| Improvements ✅
(secondary) | -0.3% | [-0.6%, -0.1%] | 9 |
+| All ❌✅ (primary) | -0.2% | [-0.3%, -0.1%] | 8 |
+
+
+Move more code to `RawVec::finish_grow` [#147124](https://github.com/rust-lang/rust/pull/147124) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=360a3a4e65cb70ea6e9da69cbb15f460dee516fd&end=be0ade2b602bdfe37a3cc259fcc79e8624dcba94&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | - | - | 0 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | -0.2% | [-0.4%, -0.1%] | 5 |
+| Improvements ✅
(secondary) | -0.1% | [-0.2%, -0.0%] | 7 |
+| All ❌✅ (primary) | -0.2% | [-0.4%, -0.1%] | 5 |
+
+
+Rollup of 8 pull requests [#147603](https://github.com/rust-lang/rust/pull/147603) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=3be68033b67dfc2aa3ae4cfe735aa5805aebae43&end=89276493d3c3f85691e76b27a9dde7ec82e79cdb&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | - | - | 0 |
+| Regressions ❌
(secondary) | 0.0% | [0.0%, 0.0%] | 1 |
+| Improvements ✅
(primary) | -0.2% | [-0.2%, -0.1%] | 3 |
+| Improvements ✅
(secondary) | -0.1% | [-0.1%, -0.0%] | 13 |
+| All ❌✅ (primary) | -0.2% | [-0.2%, -0.1%] | 3 |
+
+
+Split overlapping_{inherent,trait}_impls [#147502](https://github.com/rust-lang/rust/pull/147502) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=35456985fab3419baf4bf111b8bbbd5e8565615d&end=956f47c32f1bd97b22cd702d7ccf78f0f0d42c34&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | - | - | 0 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | -0.2% | [-0.4%, -0.1%] | 15 |
+| Improvements ✅
(secondary) | -0.2% | [-0.2%, -0.1%] | 4 |
+| All ❌✅ (primary) | -0.2% | [-0.4%, -0.1%] | 15 |
+
+
+#### Mixed
+
+Prevent downstream `impl DerefMut for Pin` [#145608](https://github.com/rust-lang/rust/pull/145608) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=4a54b26d30dac43778afb0e503524b763fce0eee&end=fed46ffd5059e11669df1bd9406b02914c3fb73f&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | 0.3% | [0.3%, 0.3%] | 2 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | - | - | 0 |
+| Improvements ✅
(secondary) | -0.0% | [-0.0%, -0.0%] | 1 |
+| All ❌✅ (primary) | 0.3% | [0.3%, 0.3%] | 2 |
+
+- Tiny regression on hyper, otherwise netural. This PR fixes soundness anyway.
+- Marked as triaged.
+
+Perform InstSimplify before ReferencePropagation. [#147483](https://github.com/rust-lang/rust/pull/147483) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=4b57d8154a6a74d2514cd3a674c1f29a588f224a&end=0b278a539440be291466ea463a9b6310eaf4d7bb&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | - | - | 0 |
+| Regressions ❌
(secondary) | 0.2% | [0.1%, 0.7%] | 6 |
+| Improvements ✅
(primary) | -0.3% | [-0.5%, -0.1%] | 6 |
+| Improvements ✅
(secondary) | -0.3% | [-0.6%, -0.1%] | 6 |
+| All ❌✅ (primary) | -0.3% | [-0.5%, -0.1%] | 6 |
+
+- Some tiny wins on primary benchmarks, but overall it's a wash.
+- Marked as triaged.
+
+Perform unused assignment and unused variables lints on MIR. [#142390](https://github.com/rust-lang/rust/pull/142390) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=89276493d3c3f85691e76b27a9dde7ec82e79cdb&end=ff6dc928c5e33ce8e65c6911a790b9efcb5ef53a&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | 0.6% | [0.1%, 2.0%] | 75 |
+| Regressions ❌
(secondary) | 0.7% | [0.0%, 3.7%] | 76 |
+| Improvements ✅
(primary) | -0.3% | [-0.3%, -0.3%] | 1 |
+| Improvements ✅
(secondary) | -0.4% | [-0.5%, -0.4%] | 6 |
+| All ❌✅ (primary) | 0.6% | [-0.3%, 2.0%] | 76 |
+
+- The regressions on the check builds are real, but they mostly didn't carry over to debug and opt builds. This is a big compiler change that took years to land, so I think that we just eat the cost.
+- Marked as triaged.