On Tue, 21 Sep 2021 21:58:48 GMT, Claes Redestad <redes...@openjdk.org> wrote:
> This patch extends the `ISO_8859_1.implEncodeISOArray` intrinsic on x86 to > work also for ASCII encoding, which makes for example the `UTF_8$Encoder` > perform on par with (or outperform) similarly getting charset encoded bytes > from a String. The former took a small performance hit in JDK 9, and the > latter improved greatly in the same release. > > Extending the `EncodeIsoArray` intrinsics on other platforms should be > possible, but I'm unfamiliar with the macro assembler in general and unlike > the x86 intrinsic they don't use a simple vectorized mask to implement the > latin-1 check. For example aarch64 seem to filter out the low bytes and then > check if there's any bits set in the high bytes. Clever, but very different > to the 0xFF80 2-byte mask that an ASCII test wants. This pull request has now been integrated. Changeset: aaa36cc0 Author: Claes Redestad <redes...@openjdk.org> URL: https://git.openjdk.java.net/jdk/commit/aaa36cc0069043e34b47e89769eb9eba39e5362a Stats: 783 lines in 28 files changed: 392 ins; 355 del; 36 mod 8274242: Implement fast-path for ASCII-compatible CharsetEncoders on x86 Reviewed-by: naoto, thartmann ------------- PR: https://git.openjdk.java.net/jdk/pull/5621
