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weekly performance triage for 2022-05-10.
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‎triage/2022-05-10.md

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# 2022-05-10 Triage Log
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A good week: Several performance improvements, many around macro expansion. Only
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one regression of note, and that PR author opened an issue to follow up on it.
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Triage done by **@pnkfelix**.
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Revision range: [468492c2..c51871c4](https://perf.rust-lang.org/?start=468492c2af3993f18b1fe98052200575c4a2e678&end=c51871c469f7ed3b35ae25d7e6e77bc73fbdd0e3&absolute=false&stat=instructions%3Au)
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**Summary**:
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| | Regressions 😿 <br />(primary) | Regressions 😿 <br />(secondary) | Improvements 🎉 <br />(primary) | Improvements 🎉 <br />(secondary) | All 😿 🎉 <br />(primary) |
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|:----------:|:------------------------------:|:--------------------------------:|:-------------------------------:|:---------------------------------:|:------------------------:|
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| count | 11 | 37 | 117 | 65 | 128 |
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| mean | 0.7% | 0.7% | -1.2% | -1.6% | -1.1% |
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| max | 1.5% | 1.9% | -6.5% | -5.2% | -6.5% |
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2 Regressions, 4 Improvements, 1 Mixed; 1 of them in rollups
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59 artifact comparisons made in total
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#### Regressions
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Add a new Rust attribute to support embedding debugger visualizers [#91779](https://github.com/rust-lang/rust/pull/91779) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=322a14919d6cc67af45477b623857b30fae63f9d&end=a7d6768e3b60209d4195c822ea3247482909b604&stat=instructions:u)
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| | Regressions 😿 <br />(primary) | Regressions 😿 <br />(secondary) | Improvements 🎉 <br />(primary) | Improvements 🎉 <br />(secondary) | All 😿 🎉 <br />(primary) |
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|:----------:|:------------------------------:|:--------------------------------:|:-------------------------------:|:---------------------------------:|:------------------------:|
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| count | 88 | 52 | 0 | 0 | 88 |
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| mean | 0.4% | 0.5% | N/A | N/A | 0.4% |
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| max | 0.9% | 1.0% | N/A | N/A | 0.9% |
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* Original PR author opened issue #96786 to investigate these regressions, and marked as triaged.
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* (PR #96795 claims to resolve some of the regressions, but rust-timer didn't see any significant change from that.)
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Rollup of 6 pull requests [#96877](https://github.com/rust-lang/rust/pull/96877) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=0e345b76a5550d82caff5540649ee0ba6e3b4f3f&end=0dd7e10282aaa7a3e1f5660f8bb043ee4ea07355&stat=instructions:u)
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| | Regressions 😿 <br />(primary) | Regressions 😿 <br />(secondary) | Improvements 🎉 <br />(primary) | Improvements 🎉 <br />(secondary) | All 😿 🎉 <br />(primary) |
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|:----------:|:------------------------------:|:--------------------------------:|:-------------------------------:|:---------------------------------:|:------------------------:|
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| count | 18 | 0 | 0 | 0 | 18 |
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| mean | 0.4% | N/A | N/A | N/A | 0.4% |
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| max | 0.7% | N/A | N/A | N/A | 0.7% |
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* inspected graphs for the benchmarks at top of list of regressions: webrender-2022, regex-1.5.5, clap-3.1.6, cargo-0.60.0. It seems like any long-term effect here is quite minor, and
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the fact that *this* PR was tagged as significant is due to a blip in the measurements.
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* marking as triaged.
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#### Improvements
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Speed up `Token::{ident,lifetime}` [#96683](https://github.com/rust-lang/rust/pull/96683) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=364bf39e3179e148742466810d0cb9c8ec1c343a&end=343889b7234bf786e2bc673029467052f22fca08&stat=instructions:u)
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| | Regressions 😿 <br />(primary) | Regressions 😿 <br />(secondary) | Improvements 🎉 <br />(primary) | Improvements 🎉 <br />(secondary) | All 😿 🎉 <br />(primary) |
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|:----------:|:------------------------------:|:--------------------------------:|:-------------------------------:|:---------------------------------:|:------------------------:|
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| count | 0 | 0 | 151 | 82 | 151 |
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| mean | N/A | N/A | -0.9% | -0.7% | -0.9% |
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| max | N/A | N/A | -6.9% | -4.0% | -6.9% |
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Overhaul `MacArgs` [#96546](https://github.com/rust-lang/rust/pull/96546) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=343889b7234bf786e2bc673029467052f22fca08&end=4c60a0ea5b2385d7400df9db1ad04e96f2a4c154&stat=instructions:u)
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| | Regressions 😿 <br />(primary) | Regressions 😿 <br />(secondary) | Improvements 🎉 <br />(primary) | Improvements 🎉 <br />(secondary) | All 😿 🎉 <br />(primary) |
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|:----------:|:------------------------------:|:--------------------------------:|:-------------------------------:|:---------------------------------:|:------------------------:|
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| count | 1 | 1 | 16 | 9 | 17 |
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| mean | 0.3% | 0.2% | -0.8% | -0.2% | -0.8% |
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| max | 0.3% | 0.2% | -1.4% | -0.3% | -1.4% |
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Remove ItemLikeVisitor impls from rustc_typeck [#96531](https://github.com/rust-lang/rust/pull/96531) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=4799baa70d0ff1780ee6dffb743d62c79235ace9&end=f6e5570460b2bb925021dc667ead2a9834ea88cb&stat=instructions:u)
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| | Regressions 😿 <br />(primary) | Regressions 😿 <br />(secondary) | Improvements 🎉 <br />(primary) | Improvements 🎉 <br />(secondary) | All 😿 🎉 <br />(primary) |
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|:----------:|:------------------------------:|:--------------------------------:|:-------------------------------:|:---------------------------------:|:------------------------:|
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| count | 0 | 0 | 9 | 9 | 9 |
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| mean | N/A | N/A | -0.3% | -0.4% | -0.3% |
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| max | N/A | N/A | -0.4% | -0.6% | -0.4% |
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Optimize switch sources representation and usage [#96838](https://github.com/rust-lang/rust/pull/96838) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=88860d5474a32f507dde8fba8df35fd2064f11b9&end=cb390735b03aa44229ff2858be8fedbd7b0ce7cb&stat=instructions:u)
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| | Regressions 😿 <br />(primary) | Regressions 😿 <br />(secondary) | Improvements 🎉 <br />(primary) | Improvements 🎉 <br />(secondary) | All 😿 🎉 <br />(primary) |
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|:----------:|:------------------------------:|:--------------------------------:|:-------------------------------:|:---------------------------------:|:------------------------:|
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| count | 0 | 0 | 4 | 7 | 4 |
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| mean | N/A | N/A | -0.7% | -2.0% | -0.7% |
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| max | N/A | N/A | -1.0% | -2.6% | -1.0% |
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#### Mixed
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store `codegen_fn_attrs` in crate metadata [#96473](https://github.com/rust-lang/rust/pull/96473) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=0dd7e10282aaa7a3e1f5660f8bb043ee4ea07355&end=88860d5474a32f507dde8fba8df35fd2064f11b9&stat=instructions:u)
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| | Regressions 😿 <br />(primary) | Regressions 😿 <br />(secondary) | Improvements 🎉 <br />(primary) | Improvements 🎉 <br />(secondary) | All 😿 🎉 <br />(primary) |
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|:----------:|:------------------------------:|:--------------------------------:|:-------------------------------:|:---------------------------------:|:------------------------:|
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| count | 6 | 28 | 89 | 39 | 95 |
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| mean | 0.3% | 0.6% | -0.5% | -1.6% | -0.4% |
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| max | 0.6% | 2.2% | -1.4% | -4.8% | -1.4% |
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* the regressions here were [anticipated](https://github.com/rust-lang/rust/pull/96473#issuecomment-1117448044) during development. The only regressions that arose were from [doc builds](https://github.com/rust-lang/rust/pull/96473#issuecomment-1121292857) (which I confirmed via inspection of the 6 regressing cases).

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