> 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 incrementally with one additional commit since the last revision: Use improved case-twiddling comment as suggested by Martin ------------- Changes: - all: https://git.openjdk.org/jdk/pull/12632/files - new: https://git.openjdk.org/jdk/pull/12632/files/44d91544..ea2f9fa3 Webrevs: - full: https://webrevs.openjdk.org/?repo=jdk&pr=12632&range=10 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12632&range=09-10 Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 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
