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Merge pull request #6327 from Kobzol/triage-2025-01-27
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Add 2025-01-27 perf triage
nellshamrell authored Jan 30, 2025
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### Rust Compiler Performance Triage

<!-- Perf results go here -->
Relatively quiet week, with one large-ish regression that will be reverted.
[#132666](https://github.com/rust-lang/rust/pull/132666) produced a nice perf. win, by skipping
unnecessary work. This PR actually reversed a regression caused by a [previous PR](https://github.com/rust-lang/rust/pull/131984).

Triage done by **@kobzol**.

Revision range: [9a1d156f..f7538506](https://perf.rust-lang.org/?start=9a1d156f38c51441ee51e5a068f1d0caf4bb0f27&end=f753850659bdf5788332525f3fe395685929c682&absolute=false&stat=instructions%3Au)

**Summary**:

| (instructions:u) | mean | range | count |
|:----------------------------------:|:-----:|:--------------:|:-----:|
| Regressions ❌ <br /> (primary) | 0.5% | [0.2%, 2.2%] | 42 |
| Regressions ❌ <br /> (secondary) | 2.1% | [0.1%, 11.6%] | 56 |
| Improvements ✅ <br /> (primary) | -0.8% | [-4.2%, -0.1%] | 107 |
| Improvements ✅ <br /> (secondary) | -1.2% | [-4.0%, -0.1%] | 77 |
| All ❌✅ (primary) | -0.5% | [-4.2%, 2.2%] | 149 |

2 Regressions, 3 Improvements, 2 Mixed; 4 of them in rollups
45 artifact comparisons made in total

[Full report here](https://github.com/rust-lang/rustc-perf/blob/d0d5d03231a952b9f4a71a9c94ee73c33610e561/triage/2025-01-27.md).

### [Approved RFCs](https://github.com/rust-lang/rfcs/commits/master)

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