8290964: C2 compilation fails with assert "non-reduction loop contains reduction nodes"

[TobiHartmann]

Backport of JDK-8290964. Applies cleanly. Approval is pending.

Thanks,
Tobias

---

Progress

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Issue

• JDK-8290964: C2 compilation fails with assert "non-reduction loop contains reduction nodes"

Reviewing

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Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk19u pull/84/head:pull/84
$ git checkout pull/84

Update a local copy of the PR:
$ git checkout pull/84
$ git pull https://git.openjdk.org/jdk19u pull/84/head

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$ git pr checkout 84

View PR using the GUI difftool:
$ git pr show -t 84

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https://git.openjdk.org/jdk19u/pull/84.diff

[bridgekeeper]

👋 Welcome back thartmann! 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]

@TobiHartmann 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:

8290964: C2 compilation fails with assert "non-reduction loop contains reduction nodes"

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[mlbridge]

Webrevs

• 00: Full (a402f5d4)

[TobiHartmann]

/integrate

[openjdk]

Going to push as commit 6c7378a.
Since your change was applied there have been 6 commits pushed to the master branch:

• 3f3bbdf: 8285835: SIGSEGV in PhaseIdealLoop::build_loop_late_post_work
• 4708c7b: 8287217: C2: PhaseCCP: remove not visited nodes, prevent type inconsistency
• 71b38e2: 8292780: misc tests failed "assert(false) failed: graph should be schedulable"
• 62db7bb: 8293996: C2: fix and simplify IdealLoopTree::do_remove_empty_loop
• c8082a3: 8296771: RISC-V: C2: assert(false) failed: bad AD file
• 2adc3e1: 8295414: [Aarch64] C2: assert(false) failed: bad AD file

Your commit was automatically rebased without conflicts.

[openjdk]

@TobiHartmann Pushed as commit 6c7378a.

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