8277906: Incorrect type for IV phi of long counted loops after CCP

[rwestrel]

This failure occurs because the iv phi of a long counted loop has the
wrong type after CCP. That happens because, during CCP, after the type
of the limit of the counted loop is updated, the type of the iv phi is
not recomputed. The fix is to apply to long counted loops the logic
that already exists for int counted loop.

---

Progress

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Issue

• JDK-8277906: Incorrect type for IV phi of long counted loops after CCP

Reviewers

• Tobias Hartmann (@TobiHartmann - Reviewer)
• Christian Hagedorn (@chhagedorn - Reviewer)

Reviewing

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[bridgekeeper]

👋 Welcome back roland! 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]

@rwestrel The following label will be automatically applied to this pull request:

• hotspot-compiler

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[mlbridge]

Webrevs

• 00: Full (c610f51d)

[TobiHartmann]

Looks good to me but what about this code?

jdk/src/hotspot/share/opto/phaseX.cpp

Lines 1573 to 1575 in 37ff7f3

	if (use_op == Op_CmpI) {
	Node* phi = countedloop_phi_from_cmp((CmpINode*)use, n);
	if (phi != NULL) {

[rwestrel]

Thanks for the review.

Looks good to me but what about this code?

Good catch. I didn't notice that one. I think it is specific to int counted loops when the pre/main/post loops are created.

[TobiHartmann]

Okay, makes sense.

[openjdk]

@rwestrel 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:

8277906: Incorrect type for IV phi of long counted loops after CCP

Reviewed-by: thartmann, chagedorn

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 88 new commits pushed to the master branch:

• d2b16c8: 8276126: Dump time class transformation causes heap objects of non-boot classes to be archived
• 7696897: 8276837: [macos]: Error when signing the additional launcher
• 3d98ec1: 8273056: java.util.random does not correctly sample exponential or Gaussian distributions
• b79554b: 8278130: Failure in jdk/javadoc/tool/CheckManPageOptions.java after JDK-8274639
• ea905bd: 8277924: Small tweaks to foreign function and memory API
• e002bfe: 8278049: G1: add precondition to set_remainder_to_point_to_start
• 16cfbc4: 8278071: typos in MemorySegment::set, MemorySegment::setAtIndex javadoc
• 84ca14d: 8277194: applications/runthese/RunThese30M.java crashes with jfrSymbolTable.cpp:305 assert(_instance != null)
• 103da8f: 8274639: Provide a way to disable warnings for cross-modular links
• 088b244: 8251216: Implement MD5 intrinsics on AArch64
• ... and 78 more: https://git.openjdk.java.net/jdk/compare/3034ae87ce4b94c7dc40cfb5a96d6d1e87910bbf...master

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.

[chhagedorn]

Looks good!

[rwestrel]

@TobiHartmann @chhagedorn thanks for the reviews.

[rwestrel]

/integrate

[openjdk]

Going to push as commit 3889af3.
Since your change was applied there have been 88 commits pushed to the master branch:

• d2b16c8: 8276126: Dump time class transformation causes heap objects of non-boot classes to be archived
• 7696897: 8276837: [macos]: Error when signing the additional launcher
• 3d98ec1: 8273056: java.util.random does not correctly sample exponential or Gaussian distributions
• b79554b: 8278130: Failure in jdk/javadoc/tool/CheckManPageOptions.java after JDK-8274639
• ea905bd: 8277924: Small tweaks to foreign function and memory API
• e002bfe: 8278049: G1: add precondition to set_remainder_to_point_to_start
• 16cfbc4: 8278071: typos in MemorySegment::set, MemorySegment::setAtIndex javadoc
• 84ca14d: 8277194: applications/runthese/RunThese30M.java crashes with jfrSymbolTable.cpp:305 assert(_instance != null)
• 103da8f: 8274639: Provide a way to disable warnings for cross-modular links
• 088b244: 8251216: Implement MD5 intrinsics on AArch64
• ... and 78 more: https://git.openjdk.java.net/jdk/compare/3034ae87ce4b94c7dc40cfb5a96d6d1e87910bbf...master

Your commit was automatically rebased without conflicts.

[openjdk]

@rwestrel Pushed as commit 3889af3.

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