On Tue, 7 Feb 2023 13:30:35 GMT, Claes Redestad <redes...@openjdk.org> wrote:
> This patch adds special-cases to `Arrays.copyOf` and `Arrays.copyOfRange` to > copy arrays more efficiently when exactly the whole input array is to be > copied. This helps eliminate range checks and has been verified to help > various String operations. Example: > > Baseline > > Benchmark (size) Mode Cnt > Score Error Units > StringConstructor.newStringFromArray 7 avgt 15 > 16.817 ± 0.369 ns/op > StringConstructor.newStringFromArrayWithCharset 7 avgt 15 > 16.866 ± 0.449 ns/op > StringConstructor.newStringFromArrayWithCharsetName 7 avgt 15 > 22.198 ± 0.396 ns/op > > Patch: > > Benchmark (size) Mode Cnt > Score Error Units > StringConstructor.newStringFromArray 7 avgt 15 > 14.666 ± 0.336 ns/op > StringConstructor.newStringFromArrayWithCharset 7 avgt 15 > 14.582 ± 0.288 ns/op > StringConstructor.newStringFromArrayWithCharsetName 7 avgt 15 > 20.339 ± 0.328 ns/op This pull request has now been integrated. Changeset: 1f9c110c Author: Claes Redestad <redes...@openjdk.org> URL: https://git.openjdk.org/jdk/commit/1f9c110c1f9ea6f5c3621a25692ce9d7abf245d4 Stats: 209 lines in 2 files changed: 179 ins; 21 del; 9 mod 8301958: Reduce Arrays.copyOf/-Range overheads Reviewed-by: alanb, smarks ------------- PR: https://git.openjdk.org/jdk/pull/12453
