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. core library part of the changes looks good to me. ------------- Marked as reviewed by naoto (Reviewer). PR: https://git.openjdk.java.net/jdk/pull/5621
