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+# 2024-10-29 Triage Log
+
+This week saw a lot of activity both on the regressions and improvements side. There was one large
+regression, which was immediately reverted. Overall, the week ended up being positive, thanks to
+a rollup PR that caused a tiny improvement to almost all benchmarks.
+
+Triage done by **@kobzol**.
+Revision range: [3e33bda0..c8a8c820](https://perf.rust-lang.org/?start=3e33bda0326586a6e1e34d0f5c060ca6d116e6a4&end=c8a8c82035439cb2404b8f24ca0bc18209d534ca&absolute=false&stat=instructions%3Au)
+
+**Summary**:
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | 0.7% | [0.2%, 2.7%] | 15 |
+| Regressions ❌
(secondary) | 0.8% | [0.1%, 1.6%] | 22 |
+| Improvements ✅
(primary) | -0.6% | [-1.5%, -0.2%] | 153 |
+| Improvements ✅
(secondary) | -0.7% | [-1.9%, -0.1%] | 80 |
+| All ❌✅ (primary) | -0.5% | [-1.5%, 2.7%] | 168 |
+
+
+6 Regressions, 6 Improvements, 4 Mixed; 6 of them in rollups
+58 artifact comparisons made in total
+
+#### Regressions
+
+Revise arm platform notes regarding soft float [#130987](https://github.com/rust-lang/rust/pull/130987) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=3ec4308f6cb4bba3140d736d9ebd53b234fa7df8&end=edbd9398dcc0e3b6ffe0dd0cd4578d37d1d36974&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:----:|:------------:|:-----:|
+| Regressions ❌
(primary) | 2.9% | [2.9%, 2.9%] | 1 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | - | - | 0 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | 2.9% | [2.9%, 2.9%] | 1 |
+
+- Noise, this PR only modified documentation.
+- Marked as triaged.
+
+Dont consider predicates that may hold as impossible in `is_impossible_associated_item` [#131840](https://github.com/rust-lang/rust/pull/131840) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=4392847410ddd67f6734dd9845f9742ff9e85c83&end=814df6e50eaf89b90793e7d9618bb60f1f18377a&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:----:|:------------:|:-----:|
+| Regressions ❌
(primary) | 0.6% | [0.2%, 2.3%] | 9 |
+| Regressions ❌
(secondary) | 0.2% | [0.2%, 0.2%] | 1 |
+| Improvements ✅
(primary) | - | - | 0 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | 0.6% | [0.2%, 2.3%] | 9 |
+
+- The largest regression was just noise, the rest was small enough and was deemed to be acceptable.
+- Marked as triaged.
+
+nightly feature tracking: get rid of the per-feature bool fields [#132027](https://github.com/rust-lang/rust/pull/132027) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=ffd978b7bf4ccdc74fe6c1b048d253eb3f3aa341&end=be01dabfefd2daa4574b974f571c7852085d60cb&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:----:|:------------:|:-----:|
+| Regressions ❌
(primary) | 1.2% | [1.1%, 1.2%] | 4 |
+| Regressions ❌
(secondary) | 0.5% | [0.1%, 1.1%] | 34 |
+| Improvements ✅
(primary) | - | - | 0 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | 1.2% | [1.1%, 1.2%] | 4 |
+
+- The small regressions were only on tiny benchmarks and stress tests, which was deemed to be acceptable.
+
+Rollup of 10 pull requests [#132094](https://github.com/rust-lang/rust/pull/132094) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=b8bb2968ce1e44d01520c9d59ee6299ed66df3f9&end=55b7f8e800a6a43657a8582450323d546297c950&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:----:|:------------:|:-----:|
+| Regressions ❌
(primary) | 0.2% | [0.1%, 0.2%] | 4 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | - | - | 0 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | 0.2% | [0.1%, 0.2%] | 4 |
+
+- The tiny regressions were reverted in a follow-up merge.
+- Marked as triaged.
+
+Emit future-incompatibility lint when calling/declaring functions with vectors that require missing target feature [#127731](https://github.com/rust-lang/rust/pull/127731) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=45089ec19ebebec88bace6ec237244ff0eaa7ad3&end=6faf0bd3e561f1a0c81f3eafe0ce0e688385d70e&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | 5.0% | [0.3%, 16.9%] | 77 |
+| Regressions ❌
(secondary) | 4.7% | [0.1%, 29.4%] | 30 |
+| Improvements ✅
(primary) | -0.1% | [-0.1%, -0.1%] | 1 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | 4.9% | [-0.1%, 16.9%] | 78 |
+
+- This was a large regression that was immediately reverted in https://github.com/rust-lang/rust/pull/132152.
+- Investigation into how to land this change without such large regressions is happening in https://github.com/rust-lang/rust/pull/132173
+- Marked as triaged.
+
+bump stdarch [#132145](https://github.com/rust-lang/rust/pull/132145) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=9f57edf2e261ade3c926d69459162057f15164d6&end=3f1be1ec7ec3d8e80beb381ee82164a0aa3ca777&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:----:|:------------:|:-----:|
+| Regressions ❌
(primary) | 0.9% | [0.9%, 0.9%] | 1 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | - | - | 0 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | 0.9% | [0.9%, 0.9%] | 1 |
+
+- One tiny regression caused by a dependency upgrade, no need to investigate further.
+- Marked as triaged.
+
+#### Improvements
+
+(ci) Update macOS Xcode to 15 [#131570](https://github.com/rust-lang/rust/pull/131570) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=31e102c509192189be841954f38962eb3cd9e2e2&end=4392847410ddd67f6734dd9845f9742ff9e85c83&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | - | - | 0 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | -3.6% | [-3.6%, -3.6%] | 1 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | -3.6% | [-3.6%, -3.6%] | 1 |
+
+
+better default capacity for str::replace [#131929](https://github.com/rust-lang/rust/pull/131929) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=8bf64f106ac0cd1f2b9c6fd27965dd2dc4b862dd&end=b13176595d8a9fd27334747080764a53a18f4c24&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | - | - | 0 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | -0.3% | [-0.4%, -0.2%] | 3 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | -0.3% | [-0.4%, -0.2%] | 3 |
+
+
+rustdoc: hash assets at rustdoc build time [#131951](https://github.com/rust-lang/rust/pull/131951) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=55b7f8e800a6a43657a8582450323d546297c950&end=8aca4bab080b2c81065645fc070acca7a060f8a3&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | - | - | 0 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | -0.2% | [-0.3%, -0.1%] | 6 |
+| Improvements ✅
(secondary) | -0.3% | [-0.3%, -0.1%] | 17 |
+| All ❌✅ (primary) | -0.2% | [-0.3%, -0.1%] | 6 |
+
+
+Revert #127731 "Emit error when calling/declaring functions with unavailable …" [#132152](https://github.com/rust-lang/rust/pull/132152) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=a06b7cbe21967a86050fa92dab843c8afda1c28e&end=ae4c6b66402cdbda8daa626216efd94e2dbe94b2&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:---------------:|:-----:|
+| Regressions ❌
(primary) | - | - | 0 |
+| Regressions ❌
(secondary) | 0.3% | [0.3%, 0.3%] | 1 |
+| Improvements ✅
(primary) | -4.7% | [-14.4%, -0.3%] | 75 |
+| Improvements ✅
(secondary) | -4.5% | [-22.7%, -0.2%] | 27 |
+| All ❌✅ (primary) | -4.7% | [-14.4%, -0.3%] | 75 |
+
+- Revert of the previously mentioned [#127731](https://github.com/rust-lang/rust/pull/127731).
+
+Rollup of 3 pull requests [#132171](https://github.com/rust-lang/rust/pull/132171) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=ae4c6b66402cdbda8daa626216efd94e2dbe94b2&end=80d0d927d5069b67cc08c0c65b48e7b6e0cdeeb5&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | - | - | 0 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | -0.3% | [-0.3%, -0.2%] | 2 |
+| Improvements ✅
(secondary) | -0.3% | [-0.4%, -0.2%] | 16 |
+| All ❌✅ (primary) | -0.3% | [-0.3%, -0.2%] | 2 |
+
+- The small wins probably come from [#132168](https://github.com/rust-lang/rust/pull/132168).
+
+Rollup of 9 pull requests [#132277](https://github.com/rust-lang/rust/pull/132277) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=a9d17627d241645a54c1134a20f1596127fedb60&end=2df8dbb1b37168c59eca2884502a1b79892858a9&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | - | - | 0 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | -0.5% | [-1.7%, -0.1%] | 186 |
+| Improvements ✅
(secondary) | -0.6% | [-1.7%, -0.1%] | 92 |
+| All ❌✅ (primary) | -0.5% | [-1.7%, -0.1%] | 186 |
+
+- The large amount of small wins might have been caused by [#130259](https://github.com/rust-lang/rust/pull/130259).
+
+#### Mixed
+
+Rollup of 5 pull requests [#132053](https://github.com/rust-lang/rust/pull/132053) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=e1f306899514ea80abc1d1c9f6a57762afb304a3&end=9abfcb49002b82f46ad66ceb0b26cee8be2dc658&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | 1.0% | [0.3%, 1.8%] | 2 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | - | - | 0 |
+| Improvements ✅
(secondary) | -0.5% | [-0.5%, -0.5%] | 1 |
+| All ❌✅ (primary) | 1.0% | [0.3%, 1.8%] | 2 |
+
+- Large number of small-ish regressions that were just under the statistical threshold.
+- Might have been caused by LLVM doing more work because of [#132031](https://github.com/rust-lang/rust/pull/132031).
+- Not marking as triaged yet, investigation ongoing.
+
+Represent trait constness as a distinct predicate [#131985](https://github.com/rust-lang/rust/pull/131985) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=f61306d47bc98af8bb9d15f1adf6086785590a8c&end=1d4a7670d4f37bfbae2d89ec3ec07cd40dbc5a5d&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | 0.5% | [0.1%, 1.2%] | 16 |
+| Regressions ❌
(secondary) | 0.9% | [0.1%, 1.5%] | 22 |
+| Improvements ✅
(primary) | -0.3% | [-0.5%, -0.1%] | 44 |
+| Improvements ✅
(secondary) | -0.3% | [-0.6%, -0.1%] | 13 |
+| All ❌✅ (primary) | -0.1% | [-0.5%, 1.2%] | 60 |
+
+- This was a large internal refactoring that had mostly positive or neutral effects on performance,
+ although it did cause regressions in `doc` builds on several benchmarks.
+- It was deemed acceptable during review.
+- Marked as triaged.
+
+Rollup of 4 pull requests [#132116](https://github.com/rust-lang/rust/pull/132116) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=1d4a7670d4f37bfbae2d89ec3ec07cd40dbc5a5d&end=a93c1718c80b9f100056c8eec3fc37fbd6424134&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | 0.3% | [0.1%, 1.8%] | 49 |
+| Regressions ❌
(secondary) | 0.8% | [0.1%, 1.3%] | 6 |
+| Improvements ✅
(primary) | -0.3% | [-0.3%, -0.3%] | 1 |
+| Improvements ✅
(secondary) | -0.7% | [-1.8%, -0.1%] | 3 |
+| All ❌✅ (primary) | 0.3% | [-0.3%, 1.8%] | 50 |
+
+- The regression was caused by [#131983](https://github.com/rust-lang/rust/pull/131983), which
+ stabilized a new behavior change that will appear in Edition 2024.
+- Not marking as triaged yet, there might be a way to claw some of the regressions back.
+
+Rollup of 12 pull requests [#132317](https://github.com/rust-lang/rust/pull/132317) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=c8a8c82035439cb2404b8f24ca0bc18209d534ca&end=2dece5bb62f234f5622a08289c5a3d1555cd7843&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | 0.2% | [0.2%, 0.4%] | 4 |
+| Regressions ❌
(secondary) | 0.2% | [0.2%, 0.2%] | 1 |
+| Improvements ✅
(primary) | -0.2% | [-0.4%, -0.1%] | 6 |
+| Improvements ✅
(secondary) | -0.3% | [-0.3%, -0.3%] | 1 |
+| All ❌✅ (primary) | -0.0% | [-0.4%, 0.4%] | 10 |
+
+- Performance results were a wash.
+- Marked as triaged.