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Handle array manually in str case conversion methods #52116
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r? @aidanhs (rust_highfive has picked a reviewer for you, use r? to override) |
Ping from triage, @aidanhs. This PR requires your review. |
Ping from triage, @aidanhs / @rust-lang/libs: This PR requires your review. |
Looks good, thanks! @bors r+ |
📌 Commit ad7621d has been approved by |
⌛ Testing commit ad7621d with merge 8b23f7531ba2a8ef729fe6f63eff5a00aea3519b... |
💔 Test failed - status-travis |
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Seems to be #50887. |
Handle array manually in str case conversion methods Avoiding the overhead incurred from `String.extend(char.to_lowercase())` showed a notable performance improvement when I benchmarked it. I tested on these strings: ```rust ALL_LOWER: "loremipsumdolorsitametduosensibusmnesarchumabcdefgh" ALL_UPPER: "LOREMIPSUMDOLORSITAMETDUOSENSIBUSMNESARCHUMABCDEFGH" REALISTIC_UPPER: "LOREM IPSUM DOLOR SIT AMET, DUO SENSIBUS MNESARCHUM" SIGMAS: "ΣΣΣΣΣ ΣΣΣΣΣ ΣΣΣΣΣ ΣΣΣ ΣΣΣΣ, ΣΣΣ ΣΣΣΣΣΣΣΣ ΣΣΣΣΣΣΣΣΣΣ" WORD_UPPER: "Lorem Ipsum Dolor Sit Amet, Duo Sensibus Mnesarchum" ``` the performance improvements of `to_lowercase()` were ``` running 10 tests test tests::all_lower ... bench: 1,752 ns/iter (+/- 49) test tests::all_lower_new ... bench: 1,266 ns/iter (+/- 15) -28% test tests::all_upper ... bench: 1,832 ns/iter (+/- 39) test tests::all_upper_new ... bench: 1,337 ns/iter (+/- 18) -27% test tests::realistic_upper ... bench: 1,993 ns/iter (+/- 14) test tests::realistic_upper_new ... bench: 1,445 ns/iter (+/- 22) -27% test tests::sigmas ... bench: 1,342 ns/iter (+/- 39) test tests::sigmas_new ... bench: 1,226 ns/iter (+/- 16) -9% test tests::word_upper ... bench: 1,899 ns/iter (+/- 12) test tests::word_upper_new ... bench: 1,381 ns/iter (+/- 26) -27% ``` and of `to_uppercase()` ``` running 10 tests test tests::all_lower ... bench: 1,813 ns/iter (+/- 20) test tests::all_lower_new ... bench: 1,321 ns/iter (+/- 16) -27% test tests::all_upper ... bench: 1,629 ns/iter (+/- 22) test tests::all_upper_new ... bench: 1,241 ns/iter (+/- 9) -24% test tests::realistic_upper ... bench: 1,670 ns/iter (+/- 24) test tests::realistic_upper_new ... bench: 1,241 ns/iter (+/- 17) -26% test tests::sigmas ... bench: 2,053 ns/iter (+/- 20) test tests::sigmas_new ... bench: 1,753 ns/iter (+/- 23) -15% test tests::word_upper ... bench: 1,873 ns/iter (+/- 30) test tests::word_upper_new ... bench: 1,412 ns/iter (+/- 25) -25% ``` I gave up on the more advanced method from rust-lang#52061 as it wasn't always a clear improvement and would help in even less cases if this PR was merged.
Rollup of 13 pull requests Successful merges: - #51628 (use checked write in `LineWriter` example) - #52116 (Handle array manually in str case conversion methods) - #52218 (Amend option.take examples) - #52418 (Do not use desugared ident when suggesting adding a type) - #52439 (Revert some changes from #51917 to fix custom libdir) - #52455 (Fix doc comment: use `?` instead of `.unwrap()`) - #52458 (rustc: Fix a suggestion for the `proc_macro` feature) - #52464 (Allow clippy to be installed with make install) - #52472 (rustc: Enable `use_extern_macros` in 2018 edition) - #52477 (Clarify short-circuiting behvaior of Iterator::zip.) - #52480 (Cleanup #24958) - #52487 (Don't build twice the sanitizers on Linux) - #52510 (rustdoc: remove FIXME about macro redirects) Failed merges: r? @ghost
Avoiding the overhead incurred from
String.extend(char.to_lowercase())
showed a notable performance improvement when I benchmarked it.I tested on these strings:
the performance improvements of
to_lowercase()
wereand of
to_uppercase()
I gave up on the more advanced method from #52061 as it wasn't always a clear improvement and would help in even less cases if this PR was merged.