Merge pull request #757 from ecstatic-morse/triage-2019-09-08

Triage 2020-09-08

Author: Mark-Simulacrum

triage/2020-09-08.md

@@ -0,0 +1,38 @@
+# 2020-09-08 Triage Log
+
+See the [README](README.md) for details on how this log was gathered.
+
+A few small compile-time regressions this week. The first was
+[#70793](https://github.com/rust-lang/rust/pull/70793), which added some
+specializations to the standard library in order to increase runtime
+performance. The second was
+[#73996](https://github.com/rust-lang/rust/pull/73996), which adds an option to
+the diagnostics code to print only the names of types and traits when they are
+unique instead of the whole path. The third was
+[#75200](https://github.com/rust-lang/rust/pull/75200), which refactored part
+of `BTreeMap` to avoid aliasing mutable references.
+
+Triage done by @ecstaticmorse.
+Revision range: [d927e5a655809b6b20501889e093c085d6ffe6f7..35fc8359868e65a0970094f648ba87fce634e8c7](https://perf.rust-lang.org/?start=d927e5a655809b6b20501889e093c085d6ffe6f7&end=35fc8359868e65a0970094f648ba87fce634e8c7&absolute=false&stat=instructions%3Au)
+
+3 Regressions, 0 Improvements, 0 of them in rollups.
+
+#### Regressions
+
+[#75200](https://github.com/rust-lang/rust/pull/75200)
+- A small regression in [instruction counts](https://perf.rust-lang.org/compare.html?start=c59199efca5856cdf810919fbf9b5bce32dc4523&end=70c5f6efc445963bbfa5dd53f81c245741eac8cb&stat=instructions:u)
+
+[#73996](https://github.com/rust-lang/rust/pull/73996)
+- A small regression in [instruction counts](https://perf.rust-lang.org/compare.html?start=0d0f6b113047b2cf9afbde990cee30fd5b866469&end=af3c6e733a40e671550e0f0f5aeecaa13772ba56&stat=instructions:u)
+
+[#70793](https://github.com/rust-lang/rust/pull/70793)
+- A small regression in [instruction counts](https://perf.rust-lang.org/compare.html?start=62dad457bc73804891c6ac9a31f90de19cbb59a3&end=0d0f6b113047b2cf9afbde990cee30fd5b866469&stat=instructions:u) for `check`, `debug` and `opt` benchmarks.
+- However, an improvement in `doc` benchmarks, likely due to better optimized standard library.
+
+#### Improvements
+
+- None
+
+#### Nags requiring follow up
+
+- [#75200](https://github.com/rust-lang/rust/pull/75200)