In BufferedReader.readLine and other similar scenarios, we need to use StringBuilder.append(char[]) to build the string.
For these scenarios, we can use the intrinsic method StringUTF16.compress and Unsafe.copyMemory instead of the character copy of the char-by-char loop to improve the speed. ------------- Commit messages: - copyright - Using StringUTF16.compress to speed up LATIN1 StringBuilder append(char[]) - Using Unsafe.copyMemory to speed up UTF16 StringBuilder append(char[]) - add append(char[]) benchmark Changes: https://git.openjdk.org/jdk/pull/24773/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24773&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8355177 Stats: 46 lines in 3 files changed: 40 ins; 0 del; 6 mod Patch: https://git.openjdk.org/jdk/pull/24773.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/24773/head:pull/24773 PR: https://git.openjdk.org/jdk/pull/24773
