> 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.

Claes Redestad has updated the pull request incrementally with one additional 
commit since the last revision:

  Add Matcher predicate to avoid changing shared code as non-x86 platforms 
implements support for the _encodeAsciiArray intrinsic

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5621/files
  - new: https://git.openjdk.java.net/jdk/pull/5621/files/12ab6ff5..9800a99a

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5621&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5621&range=01-02

  Stats: 17 lines in 6 files changed: 14 ins; 1 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5621.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5621/head:pull/5621

PR: https://git.openjdk.java.net/jdk/pull/5621

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