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9618da7c99
rust/compiler/rustc_hir_analysis
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bors 9618da7c99 Auto merge of #131422 - GnomedDev:smallvec-predicate-obligations, r=compiler-errors 
Use `ThinVec` for PredicateObligation storage

~~I noticed while profiling clippy on a project that a large amount of time is being spent allocating `Vec`s for `PredicateObligation`, and the `Vec`s are often quite small. This is an attempt to optimise this by using SmallVec to avoid heap allocations for these common small Vecs.~~

This PR turns all the `Vec<PredicateObligation>` into a single type alias while avoiding referring to `Vec` around it, then swaps the type over to `ThinVec<PredicateObligation>` and fixes the fallout. This also contains an implementation of `ThinVec::extract_if`, copied from `Vec::extract_if` and currently being upstreamed to https://github.com/Gankra/thin-vec/pull/66.

This leads to a small (0.2-0.7%) performance gain in the latest perf run.
2024-10-16 04:06:14 +00:00
..
src Auto merge of #131422 - GnomedDev:smallvec-predicate-obligations, r=compiler-errors 2024-10-16 04:06:14 +00:00
Cargo.toml bump itertools to 0.12 2024-03-08 12:34:05 +03:00
messages.ftl improve error messages for C-cmse-nonsecure-entry functions 2024-10-14 22:32:32 +02:00
README.md rustc_typeck to rustc_hir_analysis 2022-09-27 10:37:23 +02:00

README.md

For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.