> 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 incrementally with two additional commits since the last revision: - Update src/java.base/share/classes/java/lang/Long.java Co-authored-by: Raffaello Giulietti <raffaello.giulie...@oracle.com> - Update src/java.base/share/classes/java/lang/Integer.java Co-authored-by: Raffaello Giulietti <raffaello.giulie...@oracle.com> ------------- Changes: - all: https://git.openjdk.org/jdk/pull/22919/files - new: https://git.openjdk.org/jdk/pull/22919/files/1fb40bb9..40b9fafa Webrevs: - full: https://webrevs.openjdk.org/?repo=jdk&pr=22919&range=13 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22919&range=12-13 Stats: 2 lines in 2 files changed: 2 ins; 0 del; 0 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
