kennytm 2712fbed24 Rollup merge of #52116 - Pazzaz:match-str-case, r=SimonSapin ... 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 #52061 as it wasn't always a clear improvement and would help in even less cases if this PR was merged.		2018-07-18 22:34:54 +08:00
..
benches	Move deny(warnings) into rustbuild	2018-04-08 16:59:14 -06:00
collections	add outlives annotations to BTreeMap	2018-07-02 11:49:33 -04:00
tests	Add some unit tests for dangling Weak references	2018-07-07 01:41:30 +02:00
alloc.rs	Rename OOM to allocation error	2018-06-18 21:41:24 +02:00
borrow.rs	Add #[must_use] to a few standard library methods	2018-03-30 23:06:05 -07:00
boxed.rs	Revert borked changes in last commit.	2018-07-11 10:19:54 +02:00
boxed_test.rs	Add missing dyn in liballoc	2018-07-10 22:32:19 +02:00
Cargo.toml	Switch to 1.26 bootstrap compiler	2018-05-17 08:47:25 -06:00
fmt.rs	Reexport fmt::Alignment into std	2018-06-03 17:04:48 +02:00
lib.rs	Revert borked changes in last commit.	2018-07-11 10:19:54 +02:00
macros.rs	fix some typos	2017-11-21 15:33:45 +01:00
prelude.rs	Add the alloc::prelude module	2018-07-07 23:08:43 +02:00
raw_vec.rs	Move core::alloc::CollectionAllocErr to alloc::collections	2018-06-29 14:01:33 +02:00
rc.rs	Revert borked changes in last commit.	2018-07-11 10:19:54 +02:00
repeat-generic-slice.rs	Add run-pass test for repeat-generic-slice feature	2018-03-28 09:02:27 +02:00
slice.rs	Rollup merge of #51147 - tmccombs:sliceindex, r=SimonSapin	2018-06-02 13:14:25 -06:00
str.rs	Handle array manually in string case conversion methods	2018-07-06 17:20:39 +02:00
string.rs	Move core::alloc::CollectionAllocErr to alloc::collections	2018-06-29 14:01:33 +02:00
sync.rs	Revert borked changes in last commit.	2018-07-11 10:19:54 +02:00
task.rs	#[cfg(target_has_atomic_cas)] -> #[cfg(target_has_atomic = "cas")]	2018-07-05 16:52:46 -05:00
vec.rs	Removed a single trailing space. Oops.	2018-07-09 06:31:24 +02:00