8341194: [REDO] Implement C2 VectorizedHashCode on AArch64

[chadrako]

Backport JDK-8341194 [REDO] Implement C2 VectorizedHashCode on AArch64

Backport is clean. Trivial merge conflicts with includes and already present code. Original implementation JDK-8322770 caused build and test failures. Build failures that were reproducible with make bootcycle-images run on linux-aarch64 fastdebug/release successfully. All jtreg and new asmtest pass on linux-aarch64 release.

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Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• JDK-8341194 needs maintainer approval
• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8341194: [REDO] Implement C2 VectorizedHashCode on AArch64 (Enhancement - P4 - Requested)

Reviewers

• Paul Hohensee (@phohensee - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk21u-dev.git pull/1170/head:pull/1170
$ git checkout pull/1170

Update a local copy of the PR:
$ git checkout pull/1170
$ git pull https://git.openjdk.org/jdk21u-dev.git pull/1170/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 1170

View PR using the GUI difftool:
$ git pr show -t 1170

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk21u-dev/pull/1170.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back chadrako! 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 change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[openjdk]

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

[mlbridge]

Webrevs

• 00: Full (aeb80d2b)

[openjdk]

⚠️ @chadrako This change is now ready for you to apply for maintainer approval. This can be done directly in each associated issue or by using the /approval command.

[chadrako]

/approval request Clean backport to add C2 VectorizedHashCode on AArch64 for performance improvements. The change has been verified with all jtreg tests tiers on linux-aarch64 release and linux-aarch64 fastdebug

[openjdk]

@chadrako
8341194: The approval request has been created successfully.

[GoeLin]

Hi,
I would like to defer this to the April release.
It is an enhancement and rather new. That way it will have at lease some coverage by 24,