8250588: Shenandoah: LRB needs to save/restore fp registers for runtime call

[shipilev]

Unclean backport, because Shenandoah LRB-native is not present in 11u (was added later to support concurrent weak roots).

Additional testing:

• Linux x86_64 fastdebug hotspot_gc_shenandoah

---

Progress

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

Issue

• JDK-8250588: Shenandoah: LRB needs to save/restore fp registers for runtime call

Reviewers

• Zhengyu Gu (@zhengyu123 - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.java.net/jdk11u-dev pull/105/head:pull/105
$ git checkout pull/105

Update a local copy of the PR:
$ git checkout pull/105
$ git pull https://git.openjdk.java.net/jdk11u-dev pull/105/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 105

View PR using the GUI difftool:
$ git pr show -t 105

Using diff file

Download this PR as a diff file:
https://git.openjdk.java.net/jdk11u-dev/pull/105.diff

[bridgekeeper]

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[openjdk]

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

[mlbridge]

Webrevs

• 00: Full (8ccc819b)

[zhengyu123]

Looks good.

[openjdk]

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

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

8250588: Shenandoah: LRB needs to save/restore fp registers for runtime call

Reviewed-by: zgu

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:

• 1d204c5: 8260589: Crash in JfrTraceIdLoadBarrier::load(_jclass*)
• c1deb0c: 8213922: fix ctw stand-alone build

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.

➡️ To integrate this PR with the above commit message to the master branch, type /integrate in a new comment.

[shipilev]

Got the push approval.

/integrate

[openjdk]

Going to push as commit bdf8568.
Since your change was applied there have been 2 commits pushed to the master branch:

• 1d204c5: 8260589: Crash in JfrTraceIdLoadBarrier::load(_jclass*)
• c1deb0c: 8213922: fix ctw stand-alone build

Your commit was automatically rebased without conflicts.

[openjdk]

@shipilev Pushed as commit bdf8568.

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