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+# 2025-11-03 Triage Log
+
+Mostly positive week. We saw a great performance win implemented by [#148040](https://github.com/rust-lang/rust/pull/148040) and [#148182](https://github.com/rust-lang/rust/pull/148182), which optimizes crates with a lot of trivial constants.
+
+Triage done by **@kobzol**.
+Revision range: [23fced0f..35ebdf9b](https://perf.rust-lang.org/?start=23fced0fcc5e0ec260d25f04a8b78b269e5e90f0&end=35ebdf9ba1414456dfe1cb6a6b13ebae80e99734&absolute=false&stat=instructions%3Au)
+
+**Summary**:
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:---------------:|:-----:|
+| Regressions ❌
(primary) | 0.8% | [0.1%, 2.9%] | 22 |
+| Regressions ❌
(secondary) | 0.5% | [0.1%, 1.7%] | 48 |
+| Improvements ✅
(primary) | -2.8% | [-16.4%, -0.1%] | 102 |
+| Improvements ✅
(secondary) | -1.9% | [-8.0%, -0.1%] | 51 |
+| All ❌✅ (primary) | -2.1% | [-16.4%, 2.9%] | 124 |
+
+
+4 Regressions, 6 Improvements, 7 Mixed; 7 of them in rollups
+36 artifact comparisons made in total
+
+#### Regressions
+
+Rollup of 14 pull requests [#148202](https://github.com/rust-lang/rust/pull/148202) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=df984edf44203c862e01b5a20c8092d5614d872e&end=c9537a94a6300a8292804829801f7724fb8a33f6&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:----:|:------------:|:-----:|
+| Regressions ❌
(primary) | 1.7% | [0.3%, 2.9%] | 9 |
+| Regressions ❌
(secondary) | 0.7% | [0.2%, 1.6%] | 10 |
+| Improvements ✅
(primary) | - | - | 0 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | 1.7% | [0.3%, 2.9%] | 9 |
+
+- The new solver regressions come from [#147840](https://github.com/rust-lang/rust/pull/).
+- The bulk of the regression comes from [#147185](https://github.com/rust-lang/rust/pull/147185). The changes trigger a lint in `syn`, which causes many more errors to be emitted, which caused the regressions.
+- Marked as triaged.
+
+Update cc-rs to 1.2.39 [#146186](https://github.com/rust-lang/rust/pull/146186) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=c9537a94a6300a8292804829801f7724fb8a33f6&end=bc1d7273dfbc6f8a11c0086fa35f6748a13e8d3c&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:----:|:------------:|:-----:|
+| Regressions ❌
(primary) | 0.7% | [0.3%, 3.7%] | 259 |
+| Regressions ❌
(secondary) | 0.9% | [0.0%, 3.0%] | 287 |
+| Improvements ✅
(primary) | - | - | 0 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | 0.7% | [0.3%, 3.7%] | 259 |
+
+- Unexpected regression from updating cc-rs, perhaps because it stopped passing `-flto` to `jemalloc`.
+- Reverted in https://github.com/rust-lang/rust/pull/148298.
+
+Rollup of 5 pull requests [#148241](https://github.com/rust-lang/rust/pull/148241) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=4146079cee94242771864147e32fb5d9adbd34f8&end=c6d42d774d1edfb270b8faaefacc67c213b0260b&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:----:|:------------:|:-----:|
+| Regressions ❌
(primary) | 3.1% | [3.1%, 3.1%] | 1 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | - | - | 0 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | 3.1% | [3.1%, 3.1%] | 1 |
+
+- Noise.
+- Already marked as triaged.
+
+compiletest: rename `add-core-stubs`/`core-stubs-compile-flags` to `add-minicore`/`minicore-compile-flags` [#148305](https://github.com/rust-lang/rust/pull/148305) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=8483293b3b4eb209e8e8bd0d069e61de790018a8&end=b15a874aafe7eab9ea3ac2c1d59c7b03e1425027&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:----:|:------------:|:-----:|
+| Regressions ❌
(primary) | 3.1% | [3.1%, 3.1%] | 1 |
+| Regressions ❌
(secondary) | 0.2% | [0.2%, 0.2%] | 1 |
+| Improvements ✅
(primary) | - | - | 0 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | 3.1% | [3.1%, 3.1%] | 1 |
+
+- Noise.
+- Marked as triaged.
+
+#### Improvements
+
+Rollup of 4 pull requests [#148245](https://github.com/rust-lang/rust/pull/148245) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=c6d42d774d1edfb270b8faaefacc67c213b0260b&end=292db4a13ce3f329579a581b424c6cec3b1cbd2b&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | - | - | 0 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | -2.9% | [-2.9%, -2.9%] | 1 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | -2.9% | [-2.9%, -2.9%] | 1 |
+
+
+Move wasm `throw` intrinsic back to `unwind` [#148291](https://github.com/rust-lang/rust/pull/148291) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=6906167e01fba6f702f123264653f8e401546731&end=8205e6b75ec656305ac235d4726d2c7a1ddcef14&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | - | - | 0 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | -3.0% | [-3.0%, -3.0%] | 1 |
+| Improvements ✅
(secondary) | -0.8% | [-0.8%, -0.8%] | 1 |
+| All ❌✅ (primary) | -3.0% | [-3.0%, -3.0%] | 1 |
+
+
+Revert "Update cc-rs to 1.2.39 #146186" [#148298](https://github.com/rust-lang/rust/pull/148298) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=d5419f1e97b90741d51841f800d3c697c662567d&end=ab4960e680b07600ec90a8736f936df371bc7cf3&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | - | - | 0 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | -0.7% | [-3.6%, -0.3%] | 251 |
+| Improvements ✅
(secondary) | -0.9% | [-2.9%, -0.0%] | 288 |
+| All ❌✅ (primary) | -0.7% | [-3.6%, -0.3%] | 251 |
+
+
+Adjust successor iterators. [#148157](https://github.com/rust-lang/rust/pull/148157) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=647f1536d2f50b203ca9a67396225c4f7771e1c8&end=23c7bad921fb7163de37ea680bed317deaa03fda&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | - | - | 0 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | -0.2% | [-0.4%, -0.1%] | 19 |
+| Improvements ✅
(secondary) | -0.2% | [-0.4%, -0.0%] | 21 |
+| All ❌✅ (primary) | -0.2% | [-0.4%, -0.1%] | 19 |
+
+
+Rollup of 10 pull requests [#148356](https://github.com/rust-lang/rust/pull/148356) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=d85276b256a8ab18e03b6394b4f7a7b246176db7&end=fca2e941f86f51cd3c3254518f45e2145563f6be&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | - | - | 0 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | -3.0% | [-3.0%, -3.0%] | 1 |
+| Improvements ✅
(secondary) | -0.4% | [-1.0%, -0.1%] | 10 |
+| All ❌✅ (primary) | -3.0% | [-3.0%, -3.0%] | 1 |
+
+
+Rollup of 7 pull requests [#148412](https://github.com/rust-lang/rust/pull/148412) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=b15a874aafe7eab9ea3ac2c1d59c7b03e1425027&end=c5dabe8cf798123087d094f06417f5a767ca73e8&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | - | - | 0 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | -2.8% | [-2.8%, -2.8%] | 1 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | -2.8% | [-2.8%, -2.8%] | 1 |
+
+
+#### Mixed
+
+Add a fast path for lowering trivial consts [#148040](https://github.com/rust-lang/rust/pull/148040) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=34a8c7368c84fc699fc83a8851a02f93fd655931&end=4b53279854fcc60b063398181f5dc13ddc319cb8&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:---------------:|:-----:|
+| Regressions ❌
(primary) | 0.3% | [0.2%, 0.4%] | 14 |
+| Regressions ❌
(secondary) | 0.5% | [0.0%, 2.1%] | 36 |
+| Improvements ✅
(primary) | -3.7% | [-15.5%, -0.1%] | 71 |
+| Improvements ✅
(secondary) | -4.0% | [-8.2%, -0.0%] | 22 |
+| All ❌✅ (primary) | -3.0% | [-15.5%, 0.4%] | 85 |
+
+- Improvements greatly outweigh regressions.
+- Marked as triaged.
+
+Skip codegen_crate call in check mode [#148035](https://github.com/rust-lang/rust/pull/148035) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=9ea8d67cc60e88ad6fffbf299a454c44227e001c&end=adaa838976ff99a4f0661136322f64cb466b58a0&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | 1.2% | [1.2%, 1.2%] | 1 |
+| Regressions ❌
(secondary) | 1.2% | [1.2%, 1.2%] | 1 |
+| Improvements ✅
(primary) | -0.8% | [-0.8%, -0.8%] | 3 |
+| Improvements ✅
(secondary) | -0.3% | [-0.7%, -0.2%] | 11 |
+| All ❌✅ (primary) | -0.3% | [-0.8%, 1.2%] | 4 |
+
+- The `syn` regression is noise.
+- Already marked as triaged.
+
+Accept trivial consts based on trivial consts [#148182](https://github.com/rust-lang/rust/pull/148182) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=278a90913daf7707791020a592d722dd7971f196&end=044d68c3cb6a0b893b18293fa7f5719119403215&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | - | - | 0 |
+| Regressions ❌
(secondary) | 0.1% | [0.1%, 0.1%] | 2 |
+| Improvements ✅
(primary) | -0.7% | [-1.1%, -0.2%] | 13 |
+| Improvements ✅
(secondary) | -1.4% | [-1.4%, -1.4%] | 1 |
+| All ❌✅ (primary) | -0.7% | [-1.1%, -0.2%] | 13 |
+
+- Tiny regression on a secondary benchmark, improvements outweigh regressions.
+- Marked as triaged.
+
+Remove `QPath::LangItem` [#148193](https://github.com/rust-lang/rust/pull/148193) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=72fe2ffb391f397efdfafb2216028ed9952e8078&end=6906167e01fba6f702f123264653f8e401546731&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | 1.1% | [0.2%, 2.9%] | 3 |
+| Regressions ❌
(secondary) | 0.4% | [0.1%, 1.3%] | 21 |
+| Improvements ✅
(primary) | -0.2% | [-0.4%, -0.1%] | 18 |
+| Improvements ✅
(secondary) | -0.1% | [-0.2%, -0.0%] | 2 |
+| All ❌✅ (primary) | -0.0% | [-0.4%, 2.9%] | 21 |
+
+- The single primary regression is noise, otherwise it's a few small wins on primary benchmarks and a few small losses on secondary ones. Overall a wash. And since this is compiler refactoring/cleanup, there's probably not that much to be done anyway.
+- Marked as triaged.
+
+Rollup of 9 pull requests [#148337](https://github.com/rust-lang/rust/pull/148337) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=17e7324d44c7b310b776302880fdd08d9252118a&end=d85276b256a8ab18e03b6394b4f7a7b246176db7&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | 1.2% | [0.3%, 3.0%] | 5 |
+| Regressions ❌
(secondary) | 0.2% | [0.1%, 0.3%] | 5 |
+| Improvements ✅
(primary) | - | - | 0 |
+| Improvements ✅
(secondary) | -0.2% | [-0.2%, -0.2%] | 1 |
+| All ❌✅ (primary) | 1.2% | [0.3%, 3.0%] | 5 |
+
+- Small performance loss caused by [#147622](https://github.com/rust-lang/rust/pull/147622), which was reverted in [#148436](https://github.com/rust-lang/rust/pull/148436).
+- Marked as triaged.
+
+Rollup of 3 pull requests [#148425](https://github.com/rust-lang/rust/pull/148425) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=7878a919448eb219b630d1866ca06c0d412483f2&end=f2bae990e89bf696e86706b524ac32ab72945438&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | 0.1% | [0.1%, 0.2%] | 5 |
+| Regressions ❌
(secondary) | 0.2% | [0.1%, 0.2%] | 15 |
+| Improvements ✅
(primary) | - | - | 0 |
+| Improvements ✅
(secondary) | -0.2% | [-0.3%, -0.2%] | 5 |
+| All ❌✅ (primary) | 0.1% | [0.1%, 0.2%] | 5 |
+
+- Tiny `doc` losses caused likely either by stdlib doc changes introduced by [#146260](https://github.com/rust-lang/rust/pull/146260) or [#148402](https://github.com/rust-lang/rust/pull/148402) or both.
+- Marked as triaged.
+
+Revert "unicode_data refactors RUST-147622" [#148436](https://github.com/rust-lang/rust/pull/148436) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=35ebdf9ba1414456dfe1cb6a6b13ebae80e99734&end=f5711a55f5d5e2f942057d0f6d648dd2d8b2c37b&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | - | - | 0 |
+| Regressions ❌
(secondary) | 0.2% | [0.1%, 0.3%] | 5 |
+| Improvements ✅
(primary) | -0.8% | [-1.0%, -0.4%] | 3 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | -0.8% | [-1.0%, -0.4%] | 3 |
+
+- Performance-wish it's a wash, and this is a revert anyway.
+- Marked as triaged.