8339526: C2: store incorrectly removed for clone() transformed to series of loads/stores

[shipilev]

Fixes another C2 corner case.

Additional testing:

• macos-aarch64-server-fastdebug, new test fails without the fix, passes with it
• linux-aarch64-server-fastdebug, all

---

Progress

• JDK-8339526 needs maintainer approval
• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8339526: C2: store incorrectly removed for clone() transformed to series of loads/stores (Bug - P3 - Requested)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk25u-dev.git pull/377/head:pull/377
$ git checkout pull/377

Update a local copy of the PR:
$ git checkout pull/377
$ git pull https://git.openjdk.org/jdk25u-dev.git pull/377/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 377

View PR using the GUI difftool:
$ git pr show -t 377

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk25u-dev/pull/377.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

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[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.

[openjdk]

⚠️ @shipilev 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.

[mlbridge]

Webrevs

• 00: Full (b06c40c2)

[shipilev]

/approval request Fixes a C2 bug, regression in JDK 21, seen in the wild. Applies cleanly. New regression test fails without the fix, passes with it. All other testing passes as well. No bugtail since several months in mainline. Usual risk for C2 changes, but the fix also looks straightforward.

[openjdk]

@shipilev
8339526: The approval request has been created successfully.