8283187: C2: loop candidate for superword not always unrolled fully if superword fails

[TheRealMDoerr]

Backport of JDK-8283187
I had to insert the new line in IRNode.java manually, but Skara recognizes it as clean backport.

---

Progress

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

Issue

• JDK-8283187: C2: loop candidate for superword not always unrolled fully if superword fails

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.java.net/jdk17u-dev pull/333/head:pull/333
$ git checkout pull/333

Update a local copy of the PR:
$ git checkout pull/333
$ git pull https://git.openjdk.java.net/jdk17u-dev pull/333/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 333

View PR using the GUI difftool:
$ git pr show -t 333

Using diff file

Download this PR as a diff file:
https://git.openjdk.java.net/jdk17u-dev/pull/333.diff

[bridgekeeper]

👋 Welcome back mdoerr! 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]

@TheRealMDoerr 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:

8283187: C2: loop candidate for superword not always unrolled fully if superword fails

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 no new commits pushed to the master branch. If another commit should be pushed before you perform the /integrate command, your PR will be automatically rebased. If you prefer to avoid any potential 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.

[mlbridge]

Webrevs

• 00: Full (076e1c93)

[TheRealMDoerr]

/integrate

[openjdk]

Going to push as commit b5e8388.
Since your change was applied there have been 12 commits pushed to the master branch:

• c923449: 8281822: Test failures on non-DTrace builds due to incomplete DTrace* flags handling
• efabf45: 8280940: gtest os.release_multi_mappings_vm is racy
• 83dba03: 8281522: Rename ADLC classes which have the same name as hotspot variants
• ba4e609: 8282382: Report glibc malloc tunables in error reports
• bf6b1d9: 8274939: Incorrect size of the pixel storage is used by the robot on macOS
• e8db346: 8282887: Potential memory leak in sun.util.locale.provider.HostLocaleProviderAdapterImpl.getNumberPattern() on Windows
• ac41711: 8282628: Potential memory leak in sun.font.FontConfigManager.getFontConfig()
• ab2f61e: 8283497: [windows] print TMP and TEMP in hs_err and VM.info
• 06c955a: 8283249: CompressedClassPointers.java fails on ppc with 'Narrow klass shift: 0' missing
• 25f2a52: 8281450: Remove unnecessary operator new and delete from ObjectMonitor
• ... and 2 more: https://git.openjdk.java.net/jdk17u-dev/compare/2875e18190957bb49e5f7ec275fba68119e5f096...master

Your commit was automatically rebased without conflicts.

[openjdk]

@TheRealMDoerr Pushed as commit b5e8388.

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