8231717: Improve performance of charset decoding when charset is always compactable

[dchuyko]

This change improves charset decoding for a number of encodings that are "Latin1Decodable". Original patch applies cleanly.

Testing: tier1, tier2, sun/nio/cs on aarch64 and x86.

StrCodingBenchmark benchmark shows improvements for target encodings (IBM037 etc.) on both aarch64 and x86.

---

Progress

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Issue

• JDK-8231717: Improve performance of charset decoding when charset is always compactable

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.java.net/jdk11u-dev pull/58/head:pull/58
$ git checkout pull/58

Update a local copy of the PR:
$ git checkout pull/58
$ git pull https://git.openjdk.java.net/jdk11u-dev pull/58/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 58

View PR using the GUI difftool:
$ git pr show -t 58

Using diff file

Download this PR as a diff file:
https://git.openjdk.java.net/jdk11u-dev/pull/58.diff

[bridgekeeper]

👋 Welcome back dchuyko! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

This backport pull request has now been updated with issue from the original commit.

[openjdk]

@dchuyko This change now passes all automated pre-integration checks.

After integration, the commit message for the final commit will be:

8231717: Improve performance of charset decoding when charset is always compactable

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been 7 new commits pushed to the master branch:

• 48c1f60: 8263227: C2: inconsistent spilling due to dead nodes in exception block
• dcd1044: 8265773: incorrect jdeps message "jdk8internals" to describe a removed JDK internal API
• ed48e5c: 8226533: JVMCI: findUniqueConcreteMethod should handle statically bindable methods directly
• 8d5b37a: 8223050: JVMCI: findUniqueConcreteMethod() should not use Dependencies::find_unique_concrete_method() for non-virtual methods
• 3f67b07: 8267751: (test) jtreg.SkippedException has no serial VersionUID
• 46fd6d2: 8263382: java/util/logging/ParentLoggersTest.java failed with "checkLoggers: getLoggerNames() returned unexpected loggers"
• 881100f: 8233989: Create an IPv4 version of java/net/MulticastSocket/SetLoopbackMode.java

Please see this link for an up-to-date comparison between the source branch of this pull request and the master branch.
As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this automatic rebasing, please check the documentation for the /integrate command for further details.

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[mlbridge]

Webrevs

• 00: Full (33048ef0)

[dchuyko]

/integrate

[openjdk]

@dchuyko
Your change (at version 33048ef) is now ready to be sponsored by a Committer.

[RealCLanger]

/sponsor

[openjdk]

Going to push as commit 34d1c92.
Since your change was applied there have been 7 commits pushed to the master branch:

• 48c1f60: 8263227: C2: inconsistent spilling due to dead nodes in exception block
• dcd1044: 8265773: incorrect jdeps message "jdk8internals" to describe a removed JDK internal API
• ed48e5c: 8226533: JVMCI: findUniqueConcreteMethod should handle statically bindable methods directly
• 8d5b37a: 8223050: JVMCI: findUniqueConcreteMethod() should not use Dependencies::find_unique_concrete_method() for non-virtual methods
• 3f67b07: 8267751: (test) jtreg.SkippedException has no serial VersionUID
• 46fd6d2: 8263382: java/util/logging/ParentLoggersTest.java failed with "checkLoggers: getLoggerNames() returned unexpected loggers"
• 881100f: 8233989: Create an IPv4 version of java/net/MulticastSocket/SetLoopbackMode.java

Your commit was automatically rebased without conflicts.

[openjdk]

@RealCLanger @dchuyko Pushed as commit 34d1c92.

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