<i18n dev> Integrated: 8261418: Reduce decoder creation overheads for sun.nio.cs.ext Charsets
redestad at openjdk.java.net
Thu Feb 11 10:46:42 UTC 2021
On Tue, 9 Feb 2021 12:54:12 GMT, Claes Redestad <redestad at openjdk.org> wrote:
> This refactor some `sun.nio.cs.ext` charsets, such as ISO-2022-CN-GB, ISO-2022-CN-CNS, ISO-2022-KR and a few others to use static rather than per-instance auxiliary decoders. Doing so reduce overheads of calling `charset.newDecoder()`. This reduce or eliminate regressions on `new String(byte, String)` operations due the removal of thread-local decoder caching in [JDK-8259842](https://bugs.openjdk.java.net/browse/JDK-8259842)
> Most ISO-2022 Charsets define a specialized decoder already. The `ISO2022.Decoder` class was only used by `ISO2022_KR`, so folding it into that implementation and simplifying the code brings a rather significant speed-up, both to decoder creation and on actual decoding.
> Testing: tier1-3, manual runs of sun.nio.cs tests
This pull request has now been integrated.
Author: Claes Redestad <redestad at openjdk.org>
Stats: 761 lines in 15 files changed: 257 ins; 404 del; 100 mod
8261418: Reduce decoder creation overheads for sun.nio.cs.ext Charsets
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