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+# 2026-04-27 Triage Log
+
+Relatively few perf-affecting changes this week. Perf report is more positive
+than users should see due to the `-Zincremental-verify-ich` related
+improvements in [#155473](https://github.com/rust-lang/rust/pull/155473).
+
+Triage done by **@simulacrum**.
+Revision range: [9ab01ae5..ca9a134e](https://perf.rust-lang.org/?start=9ab01ae53c416f89fe256b79588a76dcbcdc9290&end=ca9a134e0985765ded9cfdde4030a5df4db7e2bd&absolute=false&stat=instructions%3Au)
+
+**Summary**:
+
+| (instructions:u)                   | mean  | range          | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌ <br /> (primary)    | 0.8%  | [0.4%, 2.0%]   | 17    |
+| Regressions ❌ <br /> (secondary)  | 0.4%  | [0.0%, 1.7%]   | 10    |
+| Improvements ✅ <br /> (primary)   | -0.8% | [-2.8%, -0.2%] | 137   |
+| Improvements ✅ <br /> (secondary) | -1.0% | [-5.3%, -0.0%] | 176   |
+| All ❌✅ (primary)                 | -0.6% | [-2.8%, 2.0%]  | 154   |
+
+1 Regression, 5 Improvements, 3 Mixed; 3 of them in rollups
+32 artifact comparisons made in total
+
+#### Regressions
+
+privacy: Assert that compared visibilities are (usually) ordered [#155257](https://github.com/rust-lang/rust/pull/155257) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=fb76025f2fe6a1c8ce03fe0931f941c8077a2c34&end=9838411cb723b60dc62b1625751075c4d933b992&stat=instructions:u)
+
+| (instructions:u)                   | mean | range        | count |
+|:----------------------------------:|:----:|:------------:|:-----:|
+| Regressions ❌ <br /> (primary)    | 0.4% | [0.2%, 0.7%] | 12    |
+| Regressions ❌ <br /> (secondary)  | -    | -            | 0     |
+| Improvements ✅ <br /> (primary)   | -    | -            | 0     |
+| Improvements ✅ <br /> (secondary) | -    | -            | 0     |
+| All ❌✅ (primary)                 | 0.4% | [0.2%, 0.7%] | 12    |
+
+This regressed in typenum and libc, both of which have many imports/items
+declared. Based on PR discussion, it sounds like this is an intentional
+regression with a goal of identifying potential bugs in the wild where
+visibilities don't match expectations.
+<https://github.com/rust-lang/rust/pull/155608> is a potential improvement
+mitigating the impact.
+
+#### Improvements
+
+Replace `ShardedHashMap` method `insert` with debug-checked `insert_unique` [#155550](https://github.com/rust-lang/rust/pull/155550) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=913e4bea83424658d76712fee9c52452a3a9ef0e&end=30837cb66de032fbc8072c8ecbf76c39c5b14478&stat=instructions:u)
+
+| (instructions:u)                   | mean  | range          | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌ <br /> (primary)    | -     | -              | 0     |
+| Regressions ❌ <br /> (secondary)  | -     | -              | 0     |
+| Improvements ✅ <br /> (primary)   | -0.4% | [-0.7%, -0.2%] | 9     |
+| Improvements ✅ <br /> (secondary) | -0.5% | [-0.7%, -0.2%] | 21    |
+| All ❌✅ (primary)                 | -0.4% | [-0.7%, -0.2%] | 9     |
+
+
+Streamline `CrateMetadataRef` construction in `provide_one!`. [#155628](https://github.com/rust-lang/rust/pull/155628) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=827651f2200cefab42dac4c2ae7f80a7149340de&end=2eaa5de4a3a911f52adbee7dda0bc84b06115576&stat=instructions:u)
+
+| (instructions:u)                   | mean  | range          | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌ <br /> (primary)    | -     | -              | 0     |
+| Regressions ❌ <br /> (secondary)  | -     | -              | 0     |
+| Improvements ✅ <br /> (primary)   | -0.5% | [-1.3%, -0.3%] | 14    |
+| Improvements ✅ <br /> (secondary) | -0.8% | [-2.2%, -0.2%] | 30    |
+| All ❌✅ (primary)                 | -0.5% | [-1.3%, -0.3%] | 14    |
+
+
+Permit `{This}` in diagnostic attribute format literals [#155662](https://github.com/rust-lang/rust/pull/155662) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=7c61a357e3c91b8a3c02dc63b7744d942d572a9a&end=80729d7ce0ec05aef7a33d9892484cfd5cf34675&stat=instructions:u)
+
+| (instructions:u)                   | mean  | range          | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌ <br /> (primary)    | -     | -              | 0     |
+| Regressions ❌ <br /> (secondary)  | -     | -              | 0     |
+| Improvements ✅ <br /> (primary)   | -     | -              | 0     |
+| Improvements ✅ <br /> (secondary) | -0.2% | [-0.3%, -0.2%] | 13    |
+| All ❌✅ (primary)                 | -     | -              | 0     |
+
+
+Prefer `-1` for `None` [#155473](https://github.com/rust-lang/rust/pull/155473) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=c7fe5e9d1eb0ef8cc033961956d60f8e2e91e741&end=d4f78565699b229227c9e9ca8164efa3d5d7213e&stat=instructions:u)
+
+| (instructions:u)                   | mean  | range          | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌ <br /> (primary)    | -     | -              | 0     |
+| Regressions ❌ <br /> (secondary)  | 0.7%  | [0.2%, 1.9%]   | 5     |
+| Improvements ✅ <br /> (primary)   | -0.3% | [-2.7%, -0.1%] | 67    |
+| Improvements ✅ <br /> (secondary) | -0.3% | [-0.8%, -0.1%] | 52    |
+| All ❌✅ (primary)                 | -0.3% | [-2.7%, -0.1%] | 67    |
+
+Rollup of 10 pull requests [#155655](https://github.com/rust-lang/rust/pull/155655) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=f676c20edd32321e9fa2781543d8970109707e30&end=913e4bea83424658d76712fee9c52452a3a9ef0e&stat=instructions:u)
+
+| (instructions:u)                   | mean  | range          | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌ <br /> (primary)    | -     | -              | 0     |
+| Regressions ❌ <br /> (secondary)  | 0.1%  | [0.0%, 0.1%]   | 2     |
+| Improvements ✅ <br /> (primary)   | -0.8% | [-3.7%, -0.2%] | 110   |
+| Improvements ✅ <br /> (secondary) | -1.2% | [-5.5%, -0.0%] | 83    |
+| All ❌✅ (primary)                 | -0.8% | [-3.7%, -0.2%] | 110   |
+
+The few regressions in include-blob look to be potentially noise. Marked as
+triaged. The majority or all of the improvements are mostly not going to affect
+users, they're specific to `-Zincremental-verify-ich` which is not on by
+default (but is on in the perf collector). See
+[comment](https://github.com/rust-lang/rust/pull/155655#issuecomment-4301028365).
+
+#### Mixed
+
+Rollup of 6 pull requests [#155596](https://github.com/rust-lang/rust/pull/155596) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=93637f398f4d0d40badc6bf1ed3f241499d06f88&end=365515367b4a20a315ec65a466991441b9dfba66&stat=instructions:u)
+
+| (instructions:u)                   | mean  | range          | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌ <br /> (primary)    | 1.0%  | [0.3%, 2.1%]   | 14    |
+| Regressions ❌ <br /> (secondary)  | 0.6%  | [0.6%, 0.7%]   | 7     |
+| Improvements ✅ <br /> (primary)   | -     | -              | 0     |
+| Improvements ✅ <br /> (secondary) | -0.2% | [-0.2%, -0.2%] | 3     |
+| All ❌✅ (primary)                 | 1.0%  | [0.3%, 2.1%]   | 14    |
+
+Ran perf runs on PRs inside the rollup and identified root cause as "Fix
+#[expect(dead_code)] liveness propagation"
+[#154377](https://github.com/rust-lang/rust/pull/154377#issuecomment-4330991142).
+Marked the regression as triaged since that is a correctness fix and I suspect
+the regression is isolated in instruction count rather than wall clock changes.
+
+`AliasTerm` refactor [#155392](https://github.com/rust-lang/rust/pull/155392) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=f9988fefd3add01f414f52b414308e7872622fee&end=1bfcb284f7a2199ad322daa463e29e708d5bc635&stat=instructions:u)
+
+| (instructions:u)                   | mean  | range          | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌ <br /> (primary)    | 0.5%  | [0.1%, 0.9%]   | 19    |
+| Regressions ❌ <br /> (secondary)  | 0.3%  | [0.0%, 0.7%]   | 19    |
+| Improvements ✅ <br /> (primary)   | -0.3% | [-0.4%, -0.2%] | 10    |
+| Improvements ✅ <br /> (secondary) | -0.3% | [-0.5%, -0.2%] | 9     |
+| All ❌✅ (primary)                 | 0.2%  | [-0.4%, 0.9%]  | 29    |
+
+[Asked](https://github.com/rust-lang/rust/pull/155392#issuecomment-4331105877)
+whether we think the tradeoff is worth it on the PR.
+
+Rollup of 7 pull requests [#155687](https://github.com/rust-lang/rust/pull/155687) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=2eaa5de4a3a911f52adbee7dda0bc84b06115576&end=36ba2c7712052d731a7082d0eba5ed3d9d56c133&stat=instructions:u)
+
+| (instructions:u)                   | mean  | range          | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌ <br /> (primary)    | 0.3%  | [0.2%, 0.5%]   | 16    |
+| Regressions ❌ <br /> (secondary)  | 0.1%  | [0.1%, 0.1%]   | 3     |
+| Improvements ✅ <br /> (primary)   | -     | -              | 0     |
+| Improvements ✅ <br /> (secondary) | -0.5% | [-0.7%, -0.2%] | 14    |
+| All ❌✅ (primary)                 | 0.3%  | [0.2%, 0.5%]   | 16    |
+
+Unclear what the root cause is. Kicked off a build on #155469.