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

[TobiHartmann]

Backport of JDK-8283187. Did not apply cleanly due to changes to surrounding code in test/hotspot/jtreg/compiler/lib/ir_framework/IRNode.java. Approval is pending.

Thanks,
Tobias

---

Progress

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Issue

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

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[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:

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

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[mlbridge]

Webrevs

• 00: Full (382cf833)

[TobiHartmann]

/integrate

[openjdk]

Going to push as commit 7ca0b98.
Since your change was applied there have been 24 commits pushed to the master branch:

• 3658f57: 8275337: C1: assert(false) failed: live_in set of first block must be empty
• bb950ee: 8282231: x86-32: runtime call to SharedRuntime::ldiv corrupts registers
• 84441e6: 8272493: Suboptimal code generation around Preconditions.checkIndex intrinsic with AVX2
• 33a5dbb: 8277055: Assert "missing inlining msg" with -XX:+PrintIntrinsics
• 4ac1e9a: 8282172: CompileBroker::log_metaspace_failure is called from non-Java/compiler threads
• 1417c0f: 8282312: Minor corrections to evbroadcasti32x4 intrinsic on x86
• 623cc73: 8271055: Crash during deoptimization with "assert(bb->is_reachable()) failed: getting result from unreachable basicblock" with -XX:+VerifyStack
• 8956913: 8279219: [REDO] C2 crash when allocating array of size too large
• e580f0e: 8280600: C2: assert(!had_error) failed: bad dominance
• 662ec01: 8281544: assert(VM_Version::supports_avx512bw()) failed for Tests jdk/incubator/vector/
• ... and 14 more: https://git.openjdk.java.net/jdk18u/compare/9f39b4bf33826ed6524a50dc5e6b0f085b3836ff...master

Your commit was automatically rebased without conflicts.

[openjdk]

@TobiHartmann Pushed as commit 7ca0b98.

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