> This PR suggests we can speed up `StringLatin1.regionMatchesCI` by applying
> 'the oldest ASCII trick in the book'.
>
> The new static method `CharacterDataLatin1.equalsIgnoreCase` compares two
> latin1 bytes for equality ignoring case. `StringLatin1.regionMatchesCI` is
> updated to use `equalsIgnoreCase`
>
> To verify the correctness of `equalsIgnoreCase`, a new test is added to
> `EqualsIgnoreCase` with an exhaustive verification that all 256x256 latin1
> code point pairs have an `equalsIgnoreCase` consistent with
> Character.toUpperCase, Character.toLowerCase.
>
> Performance is tested for matching and mismatching cases of code point pairs
> picked from the ASCII letter, ASCII number and latin1 letter ranges. Results
> in the first comment below.
Eirik Bjorsnos has updated the pull request with a new target base due to a
merge or a rebase. The incremental webrev excludes the unrelated changes
brought in by the merge/rebase. The pull request contains 15 additional commits
since the last revision:
- Rename unconventionally named local variable 'U' to 'upper'
- Merge remote-tracking branch 'origin/master' into
regionmatches-latin1-speedup
- Add whitespace between methods
- Merge branch 'master' into regionmatches-latin1-speedup
- Remove whitespace following '('
- Revert "Spell fix for 'exhaustive' in comments in sun/text/resources"
This reverts commit 5e9927a4b35e157fd3fa72fd2663c8bfbecf32bb.
- Spell fix for 'exhaustive' in comments in sun/text/resources
- Add @bug tag to EqualsIgnoreCase test for correct issue JDK-8302871
- Add @bug tag to EqualsIgnoreCase test for JDK-8302877
- Add clarifying comments and use more descriptive variable names in the
latin1 verification EqualsIgnoreCase test
- ... and 5 more: https://git.openjdk.org/jdk/compare/7025e4c5...6588ab0f
-------------
Changes:
- all: https://git.openjdk.org/jdk/pull/12632/files
- new: https://git.openjdk.org/jdk/pull/12632/files/718fcead..6588ab0f
Webrevs:
- full: https://webrevs.openjdk.org/?repo=jdk&pr=12632&range=08
- incr: https://webrevs.openjdk.org/?repo=jdk&pr=12632&range=07-08
Stats: 20 lines in 6 files changed: 0 ins; 7 del; 13 mod
Patch: https://git.openjdk.org/jdk/pull/12632.diff
Fetch: git fetch https://git.openjdk.org/jdk pull/12632/head:pull/12632
PR: https://git.openjdk.org/jdk/pull/12632
