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‎triage/2023-06-06.md

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# 2023-06-06 Triage Log
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This week was a bunch of improvements, largely driven by cutting std debuginfo
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in [#110221] and a few MIR or codegen optimizations. No pure regressions landed
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this week!
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Triage done by **@simulacrum**.
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Revision range: [1221e43bdf413f7c405e9b17ef19d76c88222098..adc719d7147d5e2578ce08e0b4504be44650256e](https://perf.rust-lang.org/?start=1221e43bdf413f7c405e9b17ef19d76c88222098&end=adc719d7147d5e2578ce08e0b4504be44650256e&absolute=false&stat=instructions%3Au)
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**Summary**:
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| (instructions:u) | mean | range | count |
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|:----------------------------------:|:-----:|:---------------:|:-----:|
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| Regressions ❌ <br /> (primary) | 0.6% | [0.3%, 2.0%] | 11 |
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| Regressions ❌ <br /> (secondary) | 0.5% | [0.3%, 1.0%] | 9 |
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| Improvements ✅ <br /> (primary) | -1.9% | [-17.4%, -0.2%] | 103 |
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| Improvements ✅ <br /> (secondary) | -5.2% | [-17.4%, -0.2%] | 116 |
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| All ❌✅ (primary) | -1.7% | [-17.4%, 2.0%] | 114 |
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0 Regressions, 1 Improvements, 12 Mixed; 2 of them in rollups
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79 artifact comparisons made in total
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#### Regressions
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No regressions this week.
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#### Improvements
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Greatly decrease the size of `rustc_driver.so` when debuginfo is enabled [#110221](https://github.com/rust-lang/rust/pull/110221) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=51f714c8c5021fe25442e46798b1cbef2f2249ed&end=42f28f9eb41adb7a197697e5e2d6535d00fd0f4a&stat=instructions:u)
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| (instructions:u) | mean | range | count |
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|:----------------------------------:|:-----:|:---------------:|:-----:|
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| Regressions ❌ <br /> (primary) | - | - | 0 |
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| Regressions ❌ <br /> (secondary) | - | - | 0 |
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| Improvements ✅ <br /> (primary) | -8.8% | [-17.6%, -0.5%] | 17 |
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| Improvements ✅ <br /> (secondary) | -7.5% | [-17.2%, -0.2%] | 72 |
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| All ❌✅ (primary) | -8.8% | [-17.6%, -0.5%] | 17 |
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This PR compresses and cuts some debuginfo from the shipped std library,
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somewhat unintentionally. This might be something we roll back if we get
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regression reports about it - not clear whether this changes behavior in a
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meaningful way for anyone.
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[#110221]: https://github.com/rust-lang/rust/pull/110221
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#### Mixed
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Rollup of 6 pull requests [#112016](https://github.com/rust-lang/rust/pull/112016) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=786178b2ab79ae471c5efc4e1faa0c83b9151703&end=82b311b4189cce2bde455f3e091ae662a382d592&stat=instructions:u)
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| (instructions:u) | mean | range | count |
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|:----------------------------------:|:-----:|:--------------:|:-----:|
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| Regressions ❌ <br /> (primary) | 0.5% | [0.2%, 1.0%] | 14 |
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| Regressions ❌ <br /> (secondary) | 0.3% | [0.3%, 0.5%] | 6 |
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| Improvements ✅ <br /> (primary) | -0.7% | [-1.1%, -0.3%] | 2 |
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| Improvements ✅ <br /> (secondary) | -0.5% | [-0.5%, -0.5%] | 1 |
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| All ❌✅ (primary) | 0.3% | [-1.1%, 1.0%] | 16 |
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Roughly scattered changes, many of which are in high-variance benchmarks.
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Enable MatchBranchSimplification [#112001](https://github.com/rust-lang/rust/pull/112001) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=ddad0576caf8d0515ed453e04b468977c7d3dfc1&end=f59d577838fb0449a2b59ec3525a7fa91509e861&stat=instructions:u)
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| (instructions:u) | mean | range | count |
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|:----------------------------------:|:-----:|:--------------:|:-----:|
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| Regressions ❌ <br /> (primary) | 0.5% | [0.3%, 0.7%] | 5 |
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| Regressions ❌ <br /> (secondary) | 0.6% | [0.2%, 0.8%] | 10 |
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| Improvements ✅ <br /> (primary) | -0.3% | [-0.4%, -0.2%] | 4 |
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| Improvements ✅ <br /> (secondary) | -0.3% | [-0.3%, -0.3%] | 1 |
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| All ❌✅ (primary) | 0.2% | [-0.4%, 0.7%] | 9 |
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Scattered changes, mostly a wash. Optimization targets particular code patterns
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which don't occur that often in rustc most likely.
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MIR: opt-in normalization of `BasicBlock` and `Local` numbering [#111813](https://github.com/rust-lang/rust/pull/111813) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=1c53407e8c7cc922d718bde61ca34f47b6d2120f&end=089677eb32af83318467325edbef9b64053df532&stat=instructions:u)
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| (instructions:u) | mean | range | count |
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|:----------------------------------:|:-----:|:--------------:|:-----:|
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| Regressions ❌ <br /> (primary) | 0.3% | [0.3%, 0.3%] | 1 |
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| Regressions ❌ <br /> (secondary) | 0.7% | [0.3%, 1.2%] | 8 |
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| Improvements ✅ <br /> (primary) | - | - | 0 |
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| Improvements ✅ <br /> (secondary) | -1.0% | [-1.5%, -0.3%] | 7 |
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| All ❌✅ (primary) | 0.3% | [0.3%, 0.3%] | 1 |
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Mostly noise, probably. The new normalization is off by default.
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Inline derived `hash` [#111963](https://github.com/rust-lang/rust/pull/111963) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=089677eb32af83318467325edbef9b64053df532&end=f8447b963893b410f1dbce2cd752a898dc3ed8d4&stat=instructions:u)
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| (instructions:u) | mean | range | count |
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|:----------------------------------:|:-----:|:--------------:|:-----:|
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| Regressions ❌ <br /> (primary) | 0.3% | [0.3%, 0.3%] | 1 |
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| Regressions ❌ <br /> (secondary) | 0.5% | [0.2%, 0.6%] | 15 |
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| Improvements ✅ <br /> (primary) | -0.3% | [-0.6%, -0.2%] | 16 |
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| Improvements ✅ <br /> (secondary) | -0.7% | [-1.4%, -0.3%] | 21 |
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| All ❌✅ (primary) | -0.2% | [-0.6%, 0.3%] | 17 |
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Improvements outweigh regressions.
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Use `Cow` in `{D,Subd}iagnosticMessage`. [#111748](https://github.com/rust-lang/rust/pull/111748) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=dc0943d2eebf139e7e509882b803f77bfd25656d&end=70e04bd88d85cab8ed110ace5a278fab106d0ef5&stat=instructions:u)
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| (instructions:u) | mean | range | count |
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|:----------------------------------:|:-----:|:--------------:|:-----:|
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| Regressions ❌ <br /> (primary) | - | - | 0 |
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| Regressions ❌ <br /> (secondary) | 0.7% | [0.6%, 0.8%] | 5 |
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| Improvements ✅ <br /> (primary) | - | - | 0 |
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| Improvements ✅ <br /> (secondary) | -0.5% | [-0.8%, -0.3%] | 10 |
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| All ❌✅ (primary) | - | - | 0 |
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Regressions limited to secondary benchmarks, and a good portion of them are
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bimodal benchmarks. No further investigation warranted.
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Make `TrustedStep` require `Copy` [#112083](https://github.com/rust-lang/rust/pull/112083) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=45eec0fe931e02932b43b79c51f90050c973c690&end=578bcbc2b42191556c4438b80ba37fafa4193e82&stat=instructions:u)
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| (instructions:u) | mean | range | count |
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|:----------------------------------:|:-----:|:--------------:|:-----:|
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| Regressions ❌ <br /> (primary) | 0.2% | [0.2%, 0.2%] | 1 |
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| Regressions ❌ <br /> (secondary) | 0.5% | [0.2%, 0.7%] | 5 |
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| Improvements ✅ <br /> (primary) | -1.1% | [-1.1%, -1.1%] | 1 |
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| Improvements ✅ <br /> (secondary) | -1.2% | [-3.5%, -0.4%] | 13 |
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| All ❌✅ (primary) | -0.4% | [-1.1%, 0.2%] | 2 |
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Improvements clearly outweigh regressions.
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move `super_relate_consts` hack to `normalize_param_env_or_error` [#111623](https://github.com/rust-lang/rust/pull/111623) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=617d3d6d722c432cdcbf210e6db55c3bdeafe381&end=e29821ff85a2a3000d226f99f62f89464028d5d6&stat=instructions:u)
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| (instructions:u) | mean | range | count |
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|:----------------------------------:|:-----:|:--------------:|:-----:|
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| Regressions ❌ <br /> (primary) | 0.3% | [0.2%, 0.6%] | 8 |
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| Regressions ❌ <br /> (secondary) | - | - | 0 |
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| Improvements ✅ <br /> (primary) | -0.3% | [-0.3%, -0.2%] | 2 |
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| Improvements ✅ <br /> (secondary) | -2.0% | [-2.2%, -2.0%] | 6 |
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| All ❌✅ (primary) | 0.2% | [-0.3%, 0.6%] | 10 |
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Most likely inlining or other codegen changes; roughly neutral change overall.
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Enable ScalarReplacementOfAggregates in optimized builds [#112002](https://github.com/rust-lang/rust/pull/112002) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=fabf9298633ca64450fa2af535252dc44a3b1080&end=642c92e63008ffb49f6ad8344e07bfa7d5b0d9bb&stat=instructions:u)
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| (instructions:u) | mean | range | count |
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|:----------------------------------:|:-----:|:--------------:|:-----:|
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| Regressions ❌ <br /> (primary) | 0.4% | [0.2%, 0.9%] | 6 |
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| Regressions ❌ <br /> (secondary) | 0.8% | [0.3%, 2.3%] | 15 |
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| Improvements ✅ <br /> (primary) | -0.3% | [-0.9%, -0.2%] | 13 |
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| Improvements ✅ <br /> (secondary) | -1.2% | [-2.9%, -0.3%] | 3 |
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| All ❌✅ (primary) | -0.1% | [-0.9%, 0.9%] | 19 |
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SROA benefits cranelift codegen and has no significant impact on runtimes, so
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enabling by default makes sense. It also helps with MatchBranchSimplification,
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enabled in a separate PR.
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Enable ConstGoto and SeparateConstSwitch passes by default [#112040](https://github.com/rust-lang/rust/pull/112040) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=642c92e63008ffb49f6ad8344e07bfa7d5b0d9bb&end=789dd0b2a2cd68c129ba9b0aa1008939209adcfd&stat=instructions:u)
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| (instructions:u) | mean | range | count |
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|:----------------------------------:|:-----:|:--------------:|:-----:|
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| Regressions ❌ <br /> (primary) | 2.6% | [2.6%, 2.6%] | 1 |
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| Regressions ❌ <br /> (secondary) | 0.2% | [0.2%, 0.2%] | 1 |
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| Improvements ✅ <br /> (primary) | -0.5% | [-1.1%, -0.2%] | 72 |
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| Improvements ✅ <br /> (secondary) | -0.8% | [-2.0%, -0.2%] | 33 |
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| All ❌✅ (primary) | -0.4% | [-1.1%, 2.6%] | 73 |
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More MIR opt enablement -- some regressions here, but improvements are much
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more wide-ranging than the regressions.
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Rollup of 7 pull requests [#112253](https://github.com/rust-lang/rust/pull/112253) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=2f5e6bb817c115c067ff47453eb9aa89a0a31358&end=398fa2187c88de46c13c142f600064483a563c86&stat=instructions:u)
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| (instructions:u) | mean | range | count |
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|:----------------------------------:|:-----:|:--------------:|:-----:|
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| Regressions ❌ <br /> (primary) | 0.5% | [0.4%, 0.6%] | 6 |
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| Regressions ❌ <br /> (secondary) | 0.9% | [0.4%, 1.3%] | 9 |
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| Improvements ✅ <br /> (primary) | -0.4% | [-0.4%, -0.4%] | 1 |
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| Improvements ✅ <br /> (secondary) | -0.3% | [-0.4%, -0.2%] | 4 |
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| All ❌✅ (primary) | 0.4% | [-0.4%, 0.6%] | 7 |
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Possibly just noise/bimodality given benchmarks and lack of significant PRs in
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this rollup. Not investigating further.
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Only check inlining counter after recursing. [#112240](https://github.com/rust-lang/rust/pull/112240) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=d8095acb5f8134cbff59b2cc8c8b7f5cec364280&end=9eee230cd0a56bfba3ce65121798d9f9f4341cdd&stat=instructions:u)
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| (instructions:u) | mean | range | count |
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|:----------------------------------:|:-----:|:--------------:|:-----:|
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| Regressions ❌ <br /> (primary) | - | - | 0 |
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| Regressions ❌ <br /> (secondary) | 0.2% | [0.1%, 0.3%] | 5 |
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| Improvements ✅ <br /> (primary) | -0.3% | [-0.5%, -0.2%] | 6 |
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| Improvements ✅ <br /> (secondary) | -0.5% | [-1.0%, -0.3%] | 11 |
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| All ❌✅ (primary) | -0.3% | [-0.5%, -0.2%] | 6 |
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Changes in inlining, overall a positive despite a few regressions.
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Use `load`+`store` instead of `memcpy` for small integer arrays [#111999](https://github.com/rust-lang/rust/pull/111999) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=adc719d7147d5e2578ce08e0b4504be44650256e&end=fd9bf594366e73efb1a26a023e0b4de8eff82b94&stat=instructions:u)
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| (instructions:u) | mean | range | count |
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|:----------------------------------:|:-----:|:--------------:|:-----:|
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| Regressions ❌ <br /> (primary) | - | - | 0 |
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| Regressions ❌ <br /> (secondary) | 2.2% | [0.1%, 5.7%] | 3 |
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| Improvements ✅ <br /> (primary) | - | - | 0 |
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| Improvements ✅ <br /> (secondary) | -0.3% | [-0.3%, -0.3%] | 4 |
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| All ❌✅ (primary) | - | - | 0 |
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No clear impact on rustc workloads, but may benefit others.

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