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cc8da78a03
rust/compiler/rustc_middle
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bors cc8da78a03 Auto merge of #127288 - lqd:typelen-cache, r=compiler-errors 
cache type sizes in type-size limit visitor

This is basically https://github.com/rust-lang/rust/pull/125507#issuecomment-2206813779 as lcnr can't open the PR now.

Locally it reduces the `itertools` regression by quite a bit, to "only +50%" compared to nightly (that includes overhead from the local lack of artifact post-processing, and is just a data point to compare to the 10-20x timings without the cache).

```console
Benchmark 1: cargo +stage1 build --release
  Time (mean ± σ):      2.721 s ±  0.009 s    [User: 2.446 s, System: 0.325 s]
  Range (min … max):    2.710 s …  2.738 s    10 runs

Benchmark 2: cargo +nightly build --release
  Time (mean ± σ):      1.784 s ±  0.005 s    [User: 1.540 s, System: 0.279 s]
  Range (min … max):    1.778 s …  1.792 s    10 runs

Summary
  cargo +nightly build --release ran
    1.52 ± 0.01 times faster than cargo +stage1 build --release
```

On master, it's from 34s to the 2.7s above.

r? compiler-errors
2024-07-04 21:17:19 +00:00
..
src Auto merge of #127288 - lqd:typelen-cache, r=compiler-errors 2024-07-04 21:17:19 +00:00
Cargo.toml Remove some unused crate dependencies. 2024-06-10 19:55:49 +10:00
messages.ftl Re-implement a type-size based limit 2024-07-02 15:48:48 -04:00
README.md

README.md

For more information about how rustc works, see the rustc dev guide.