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Sep 5, 2021 at 06:33
Applying PGO to rustc (on both LLVM and the Rust-based frontend) can provide a ~10% improvement to compile time! https://blog.rust-lang.org/inside-rust/2020/11/11/exploring-pgo-for-the-rust-compiler.html This has been recently merged to Rust's CI:
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PGO for LLVM builds on x86_64-unknown-linux-gnu in CI by Mark-Simulacrum · Pull Request #88069 · rust-lang/rust
PGO for LLVM builds on x86_64-unknown-linux-gnu in CI by Mark-Simulacrum · Pull Request #88069 · rust-lang/rust
This shows up to 6% less instruction counts with larger - up to 18% - wins on cycles on multiple benchmarks, and up to 19% wins on the -j1 wall times for rustc self-compilation. We can afford to sp...

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