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| author | bors <bors@rust-lang.org> | 2023-07-17 15:38:33 +0000 |
|---|---|---|
| committer | bors <bors@rust-lang.org> | 2023-07-17 15:38:33 +0000 |
| commit | 410456da51262c5ecc57554ea6007327cb8328e9 (patch) | |
| tree | 051ccfbeb9f6595eba3cc2367d8ddcc516456de0 /compiler/rustc_codegen_gcc/example/alloc_example.rs | |
| parent | 54fa92287b91ff16bb6001d816dd7ae19dc52f91 (diff) | |
| parent | c83d58f5076f3a79ea79514395a02babd15687b1 (diff) | |
| download | rust-410456da51262c5ecc57554ea6007327cb8328e9.tar.gz rust-410456da51262c5ecc57554ea6007327cb8328e9.zip | |
Auto merge of #11116 - y21:format_collect, r=Manishearth
new lint: `format_collect` A perf lint that looks for `format!`ing inside of `map`, then collecting it into a `String`. Did a quick benchmark locally and it's a bit more than 2x faster with fold. `write!` is still not optimal (presumably because the fmt stuff goes through dynamic dispatch), but it's still a lot better than creating a new string on every element. I thought about making a machine applicable suggestion, but there's a lot of suggestions that need to be made here, so I decided to just add help messages. changelog: new lint: `format_collect`
Diffstat (limited to 'compiler/rustc_codegen_gcc/example/alloc_example.rs')
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