2021-08-03 Triage Log

Quiet week for performance, with no large changes. Regressions are limited to just a few benchmarks.

Triage done by @simulacrum. Revision range: 998cfe5aad7c21eb19a4bca50f05a13354706970..3354a44d2fa8d5ba6b8d6b40d2596de2c8292ec1

2 Regressions, 0 Improvements, 0 Mixed; 1 of them in rollups

Regressions

Rollup of 9 pull requests #87640

• Moderate regression in instruction counts (up to 1.4% on incr-unchanged builds of html5ever-check)
• Regressions across a few benchmarks, without an obvious cause. May be due to #87385, but logs don't appear to show the warning in those crates at a cursory check. Tagged with perf-regression for further investigation.

Implement advance_by, advance_back_by for slice::{Iter, IterMut} #87387

• Moderate regression in instruction counts (up to 1.6% on full builds of regex-opt)
• Unclear cause, likely LLVM-related.

Improvements

• None this week.

Mixed

• None this week.

Untriaged Pull Requests

• #87244 Better diagnostics with mismatched types due to implicit static lifetime
• #86777 Include terminators in instance size estimate
• #86698 Move OnDiskCache to rustc_query_impl.
• #86588 Rollup of 8 pull requests
• #86034 Change entry point to 🛡️ against 💥 💥-payloads
• #84560 Inline Iterator as IntoIterator.