> This PR proposes adding a new method to BitSet that provides an immutable > snapshot of the set in the form of an `IntPredicate`. > > The predicate is eligible for constant folding. > > Here are some classes in the JDK that would benefit directly from > constant-folding of BitSets: > > PoolReader (6) > URLEncoder (1) - Updated in this PR > HtmlTree (2) > > More over, the implementation of the predicate is @ValueBased and this would > provide additional benefits in the future. > > Initial benchmarks with the URLEncoder show encouraging results: > > > Name (encodeChars) (maxLength) (unchanged) Cnt > Base Error Test Error Unit Diff% > URLEncodeDecode.testEncodeUTF8 6 1024 0 15 > 2,371 ± 0,016 2,073 ± 0,184 ms/op 12,6% (p = 0,000*) > URLEncodeDecode.testEncodeUTF8 6 1024 75 15 > 1,772 ± 0,013 1,387 ± 0,032 ms/op 21,8% (p = 0,000*) > URLEncodeDecode.testEncodeUTF8 6 1024 100 15 > 1,230 ± 0,009 1,140 ± 0,011 ms/op 7,3% (p = 0,000*)
Per Minborg has updated the pull request incrementally with two additional commits since the last revision: - Update test/jdk/java/util/BitSet/ImmutableBitSet.java Co-authored-by: Claes Redestad <claes.redes...@oracle.com> - Remove factory check and add copyright message ------------- Changes: - all: https://git.openjdk.org/jdk/pull/15530/files - new: https://git.openjdk.org/jdk/pull/15530/files/6f80e0b6..80b5aacf Webrevs: - full: https://webrevs.openjdk.org/?repo=jdk&pr=15530&range=04 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15530&range=03-04 Stats: 32 lines in 2 files changed: 25 ins; 6 del; 1 mod Patch: https://git.openjdk.org/jdk/pull/15530.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/15530/head:pull/15530 PR: https://git.openjdk.org/jdk/pull/15530
