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+# 2024-01-02 Triage Log
+
+Overall, this week had very few regressions and a moderate amount of improvements. The two biggest improvements came in how metadata was being encoded including a change to only store StableCrateId once in DefPathTable which yielded a 0.3% average improvement across 79 different benchmarks.
+
+Triage done by **@rylev**.
+Revision range: [1ab783112..67b6975](https://perf.rust-lang.org/?start=1ab783112ab4e4807304dbd249b39771246013ef&end=67b6975051b83ef2bd28f06e8467470d570aceb3&absolute=false&stat=instructions%3Au)
+
+**Summary**:
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:---------------:|:-----:|
+| Regressions ❌
(primary) | 0.7% | [0.3%, 1.5%] | 8 |
+| Regressions ❌
(secondary) | 0.8% | [0.2%, 1.3%] | 23 |
+| Improvements ✅
(primary) | -0.6% | [-2.6%, -0.2%] | 121 |
+| Improvements ✅
(secondary) | -5.2% | [-62.5%, -0.2%] | 53 |
+| All ❌✅ (primary) | -0.5% | [-2.6%, 1.5%] | 129 |
+
+
+2 Regressions, 3 Improvements, 1 Mixed; 0 of them in rollups
+46 artifact comparisons made in total
+
+#### Regressions
+
+Emit better suggestions for `&T == T` and `T == &T` [#118431](https://github.com/rust-lang/rust/pull/118431) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=deace71034d4940d064619882e0297c4ad858b2e&end=2df6406b886757a3c1475957660a3a4ae6c786de&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | 24.0% | [18.1%, 29.5%] | 3 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | - | - | 0 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | 24.0% | [18.1%, 29.5%] | 3 |
+- Blip in the perf infrastructure that was reversed in the [next run](https://perf.rust-lang.org/compare.html?start=2df6406b886757a3c1475957660a3a4ae6c786de&end=eee93d839654def74bee9c98c4e7785d29d993cb&stat=instructions:u)
+
+
+rustc_lint: Enforce `rustc::potential_query_instability` lint [#119251](https://github.com/rust-lang/rust/pull/119251) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=67b6975051b83ef2bd28f06e8467470d570aceb3&end=e51e98dde6a60637b6a71b8105245b629ac3fe77&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:----:|:------------:|:-----:|
+| Regressions ❌
(primary) | 0.2% | [0.2%, 0.3%] | 2 |
+| Regressions ❌
(secondary) | 0.3% | [0.2%, 0.4%] | 8 |
+| Improvements ✅
(primary) | - | - | 0 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | 0.2% | [0.2%, 0.3%] | 2 |
+- Small regression that might just be worth it. There is discussion in [#119488](https://github.com/rust-lang/rust/pull/119488) on whether to do a partial revert, but so far the argument is being made to just accept the small regression.
+
+
+#### Improvements
+
+Suggest `=` to `==` in more cases, even in the face of reference mismatch [#119328](https://github.com/rust-lang/rust/pull/119328) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=2df6406b886757a3c1475957660a3a4ae6c786de&end=eee93d839654def74bee9c98c4e7785d29d993cb&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:------:|:----------------:|:-----:|
+| Regressions ❌
(primary) | - | - | 0 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | -19.2% | [-22.7%, -15.3%] | 3 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | -19.2% | [-22.7%, -15.3%] | 3 |
+- Reversal of perf infrastructure blip in previous run
+
+
+Only store StableCrateId once in DefPathTable. [#119259](https://github.com/rust-lang/rust/pull/119259) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=1a7e97f1ef3ce44f060f338c79d7dcbfb91bbc8a&end=dc450f9dcb243368275598b506d04a54d7019a42&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | 0.8% | [0.8%, 0.8%] | 1 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | -0.3% | [-0.6%, -0.2%] | 78 |
+| Improvements ✅
(secondary) | -0.4% | [-0.6%, -0.3%] | 16 |
+| All ❌✅ (primary) | -0.3% | [-0.6%, 0.8%] | 79 |
+
+
+Shrink span encoding further [#119367](https://github.com/rust-lang/rust/pull/119367) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=8d76d076665f862ec9619f2de68d6d9ca1db4601&end=fe2cfd45055abfde24cb372a311095c105265236&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | - | - | 0 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | -0.3% | [-0.5%, -0.2%] | 27 |
+| Improvements ✅
(secondary) | -0.5% | [-0.6%, -0.3%] | 11 |
+| All ❌✅ (primary) | -0.3% | [-0.5%, -0.2%] | 27 |
+
+
+#### Mixed
+
+Implement constant propagation on top of MIR SSA analysis [#116012](https://github.com/rust-lang/rust/pull/116012) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=03b50195ab61a0dc9fc8de43d1de92769c4e6f23&end=8d76d076665f862ec9619f2de68d6d9ca1db4601&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:------:|:---------------:|:-----:|
+| Regressions ❌
(primary) | 0.7% | [0.2%, 1.9%] | 10 |
+| Regressions ❌
(secondary) | 0.6% | [0.2%, 1.1%] | 15 |
+| Improvements ✅
(primary) | -0.6% | [-2.6%, -0.2%] | 26 |
+| Improvements ✅
(secondary) | -31.2% | [-62.1%, -0.2%] | 8 |
+| All ❌✅ (primary) | -0.2% | [-2.6%, 1.9%] | 36 |
+- Change has positive impacts on runtime performance and the improvements outweigh the regressions
+