| # 2020-09-15 Triage Log |
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| See the [README](README.md) for details on how this log was gathered. |
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| Triage done by @Mark-Simulacrum. |
| Revision range: [35fc8359868e65a0970094f648ba87fce634e8c7..a53f449516f23486d2dfd4e5685d4e869e8591d9](https://perf.rust-lang.org/index.html?start=35fc8359868e65a0970094f648ba87fce634e8c7&end=a53f449516f23486d2dfd4e5685d4e869e8591d9&absolute=false&stat=instructions%3Au) |
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| 1 Regressions, 2 Improvements, 0 of them in rollups. |
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| #### Regressions |
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| [Removing the `def_id` field from hot `ParamEnv` to make it smaller #76244](https://github.com/rust-lang/rust/pull/76244) |
| - A 3% instruction and [25% wall-time](https://perf.rust-lang.org/compare.html?start=a055c5a1bd95e029e9b31891db63b6dc8258b472&end=7402a394471a6738a40fea7d4f1891666e5a80c5&stat=task-clock) regression on some benchmarks. |
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| #### Improvements |
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| [BTreeMap mutable iterators should not take any reference to visited nodes during iteration #73971](https://github.com/rust-lang/rust/pull/73971) |
| - A ~1.4% improvement on token-stream-stress check in [instruction counts](https://perf.rust-lang.org/compare.html?start=b4bdc07ff5a70175dbcdff7331c557245ddb012f&end=d92155bf6ae0b7d79fc83cbeeb0cc0c765353471) |
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| [make `ConstEvaluatable` more strict #74595](https://github.com/rust-lang/rust/pull/74595) |
| - Improvement of up to 2% in [instruction counts](https://perf.rust-lang.org/compare.html?start=d92155bf6ae0b7d79fc83cbeeb0cc0c765353471&end=e2be5f568d1f60365b825530f5b5cb722460591b) |
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| #### Nags requiring follow up |
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| * [#76244](https://github.com/rust-lang/rust/pull/76244#issuecomment-694459840) |
| * Consider a revert if no comments |
