> 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 11 additional commits since the last revision: - emptyInput -> nullInput - use CharacterDataLatin1.instance::isDigit - add comments - reduce codeSize - bug fix for bound check - reduce codeSize - remove unused code - code format - bug fix - bug fix - ... and 1 more: https://git.openjdk.org/jdk/compare/9ea08455...fd51c1ce ------------- Changes: - all: https://git.openjdk.org/jdk/pull/22919/files - new: https://git.openjdk.org/jdk/pull/22919/files/9ea08455..fd51c1ce Webrevs: - full: https://webrevs.openjdk.org/?repo=jdk&pr=22919&range=03 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22919&range=02-03 Stats: 67 lines in 3 files changed: 17 ins; 12 del; 38 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
