Perf triage, 2020-06-16.

Author: nnethercote

triage/2020.md

@@ -4,6 +4,35 @@ See the [README](README.md) for details on how these logs are collated.
 
 They are in reverse chronological order.
 
+## 2020-06-16
+
+Triage done by njn.
+
+Some bustage involving Cargo meant that some merges in this period didn't get
+measured.
+
+Regressions
+- [Rollup of 10 pull requests](https://github.com/rust-lang/rust/pull/73367)
+  ([instructions](https://perf.rust-lang.org/compare.html?start=ce6d3a73b514e9649e57cee812ad129bb2112016&end=d4ecf31efc2309fb6df8c2a8af9aaf8176ab1c8d&stat=instructions:u)):
+  Regressed up to 3.5% on multiple benchmarks. Maybe
+  [#71824](https://github.com/rust-lang/rust/pull/71824) is the cause?
+- [Disable the `SimplifyArmIdentity` pass](https://github.com/rust-lang/rust/pull/73262)
+  ([instructions](https://perf.rust-lang.org/compare.html?start=7c78a5f97de07a185eebae5a5de436c80d8ba9d4&end=f4fbb93113aa4f0a0cd08e74afb35381bbfbc7f0&stat=instructions:u)):
+  A small regression on a couple of benchmarks from disabling a buggy pass,
+  which may be re-enabled in the future?
+- A small regression occurred for `syn-opt`, but I can't tell which PR was
+  responsible because the improvement occurred in one of the merges that wasn't
+  measured due to the Cargo bustage.
+
+Improvements
+- Some huge improvements occurred for `clap-rs-opt`, but I can't tell which PR
+  was responsible because the improvement occurred in one of the merges that
+  wasn't measured due to the Cargo bustage.
+- [Rollup of 8 pull requests](https://github.com/rust-lang/rust/pull/73316)
+  ([instructions](https://perf.rust-lang.org/compare.html?start=1fb612bd15bb3ef098fd24c20d0727de573b4410&end=06e47688bf15d0215edbe05b21603062f6d2eb5d&stat=instructions:u)):
+  A small improvement on `many-assoc-items`, and a tiny regression on a couple
+  of other benchmarks.
+
 ## 2020-06-09
 
 Triage done by njn.
@@ -14,7 +43,8 @@ Regressions
   A small regression in debug builds due to LLVM. Pulling in [this LLVM
   change](https://reviews.llvm.org/D80964) may fix it.
 - [Rollup of 5 pull requests](https://github.com/rust-lang/rust/pull/73081)
-  ([instructions](https://perf.rust-lang.org/compare.html?start=9c1857fad849ad56d38327b9bc11377a0bdbb4cf&end=450abe80f193ccefbfcd48214d70520f2d507f0e&stat=instructions:u))
+  ([instructions](https://perf.rust-lang.org/compare.html?start=9c1857fad849ad56d38327b9bc11377a0bdbb4cf&end=450abe80f193ccefbfcd48214d70520f2d507f0e&stat=instructions:u)):
+  Possibly due to [#72989](https://github.com/rust-lang/rust/pull/72989).
 
 Improvements
 - None.