> This is an optimization for decimal Integer.parseInt and Long.parseLong, > which improves performance by about 10%. The optimization includes: > 1. Improve performance by parsing 2 numbers at a time, which has performance > improvements for numbers with length >= 3. > 2. It uses charAt(0) for the first number. Assuming that the optimization can > eliminate boundary checks, this will be more friendly to parsing numbers with > length 1. > 3. It removes the reliance on the Character.digit method and eliminates the > reliance on the CharacterDataLatin1#DIGITS cache array, which avoids > performance degradation caused by cache misses.
Shaojin Wen has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 25 commits: - Merge remote-tracking branch 'upstream/master' into optim_parse_int_long_202501 # Conflicts: # src/java.base/share/classes/jdk/internal/util/DecimalDigits.java - use & - from @rgiulietti - remove unused - Update src/java.base/share/classes/jdk/internal/util/DecimalDigits.java Co-authored-by: Chen Liang <li...@openjdk.org> - vector digit2 - emptyInput -> nullInput - use CharacterDataLatin1.instance::isDigit - add comments - reduce codeSize - ... and 15 more: https://git.openjdk.org/jdk/compare/f446cefe...0bacfa01 ------------- Changes: https://git.openjdk.org/jdk/pull/22919/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22919&range=08 Stats: 174 lines in 5 files changed: 98 ins; 26 del; 50 mod Patch: https://git.openjdk.org/jdk/pull/22919.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/22919/head:pull/22919 PR: https://git.openjdk.org/jdk/pull/22919
