> This PR suggests we speed up Character.toUpperCase and Character.toLowerCase > for latin1 code points by applying the 'oldest ASCII trick in the book'. > > This takes advantage of the fact that latin1 uppercase code points are always > 0x20 lower than their lowercase (with the exception of two code points which > uppercase out of latin1). > > To verify the correctness of the new implementation, the test > `Latin1CaseConversion` is added with an exhaustive verification of > toUpperCase/toLowerCase for all latin1 code points. > > The implementation needs to balance the performance of the various ranges in > latin1. An effort has been made to favour operations on ASCII code points, > without causing excessive regression for higher code points. > > Performance is benchmarked for 7 chosen sample code points, each representing > a range or a special-case. Results in the first comment.
Eirik Bjorsnos has updated the pull request incrementally with one additional commit since the last revision: Spell fix for 'exhaustive' in comments in sun/text/resources ------------- Changes: - all: https://git.openjdk.org/jdk/pull/12623/files - new: https://git.openjdk.org/jdk/pull/12623/files/57a27d39..70c624d7 Webrevs: - full: https://webrevs.openjdk.org/?repo=jdk&pr=12623&range=01 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12623&range=00-01 Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod Patch: https://git.openjdk.org/jdk/pull/12623.diff Fetch: git fetch https://git.openjdk.org/jdk pull/12623/head:pull/12623 PR: https://git.openjdk.org/jdk/pull/12623
