8270848: Redundant unsafe opmask register allocation in some instruction patterns.

[bulasevich]

Backport 71ca0c08f09e87673f1cf3f918a0802961359166

The change checks specific avx features instead of common UseAVX flag.

The change is required for JDK-8281146 backport to land cleanly in x86 ad files.

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8270848: Redundant unsafe opmask register allocation in some instruction patterns.

Reviewers

• Paul Hohensee (@phohensee - Reviewer)
• Dmitry Samersoff (@dsamersoff - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk17u-dev pull/657/head:pull/657
$ git checkout pull/657

Update a local copy of the PR:
$ git checkout pull/657
$ git pull https://git.openjdk.org/jdk17u-dev pull/657/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 657

View PR using the GUI difftool:
$ git pr show -t 657

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk17u-dev/pull/657.diff

[bridgekeeper]

👋 Welcome back bulasevich! 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.

[mlbridge]

Webrevs

• 01: Full - Incremental (b7d77d03)
• 00: Full (b90eb60c)

[openjdk-notifier]

@bulasevich Please do not rebase or force-push to an active PR as it invalidates existing review comments. All changes will be squashed into a single commit automatically when integrating. See OpenJDK Developers’ Guide for more information.

[phohensee]

Lgtm.

[openjdk]

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

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

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

8270848: Redundant unsafe opmask register allocation in some instruction patterns.

Reviewed-by: phh, dsamersoff

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 2 new commits pushed to the master branch:

• 02fa363: 8287349: AArch64: Merge LDR instructions to improve C1 OSR performance
• f0acd72: 8275535: Retrying a failed authentication on multiple LDAP servers can lead to users blocked

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.

As you do not have Committer status in this project an existing Committer must agree to sponsor your change. Possible candidates are the reviewers of this PR (@phohensee, @dsamersoff) but any other Committer may sponsor as well.

➡️ To flag this PR as ready for integration with the above commit message, type /integrate in a new comment. (Afterwards, your sponsor types /sponsor in a new comment to perform the integration).

[RealCLanger]

and here - pr title needs update.

[openjdk]

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

[dsamersoff]

/sponsor

[openjdk]

@dsamersoff The change author (@bulasevich) must issue an integrate command before the integration can be sponsored.

[bulasevich]

/integrate

[openjdk]

@bulasevich
Your change (at version b7d77d0) is now ready to be sponsored by a Committer.

[dsamersoff]

/sponsor

[openjdk]

Going to push as commit 36dd0a7.
Since your change was applied there have been 2 commits pushed to the master branch:

• 02fa363: 8287349: AArch64: Merge LDR instructions to improve C1 OSR performance
• f0acd72: 8275535: Retrying a failed authentication on multiple LDAP servers can lead to users blocked

Your commit was automatically rebased without conflicts.

[openjdk]

@dsamersoff @bulasevich Pushed as commit 36dd0a7.

💡 You may see a message that your pull request was closed with unmerged commits. This can be safely ignored.

[RealCLanger]

There was no backport request nor approval...