[jdk21u-dev] RFR: 8332920: C2: Partial Peeling is wrongly applied for CmpU with negative limit

[Martin Doerr]

On Fri, 14 Jun 2024 15:38:59 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

> Clean backport of [JDK-8332920](https://bugs.openjdk.org/browse/JDK-8332920).
> Unfortunately, we're getting timeouts in the new test compiler/loopopts/TestPartialPeelAtUnsignedTestsNegativeLimit.java. Tier 1-4 have passed other than this one.
> Will retry later and possibly make adaptations.

@chhagedorn: I'm getting timeouts when trying the new test in JDK 21u:

compiler/loopopts/TestPartialPeelAtUnsignedTestsNegativeLimit.java#Xbatch              Error. Program `/jdk21_opt/images/jdk/bin/java' timed out (timeout set to 480000ms, elapsed time including timeout handling was 480262ms).
compiler/loopopts/TestPartialPeelAtUnsignedTestsNegativeLimit.java#Xcomp-compile-test  Error. Program `/jdk21_opt/images/jdk/bin/java' timed out (timeout set to 480000ms, elapsed time including timeout handling was 480283ms).
compiler/loopopts/TestPartialPeelAtUnsignedTestsNegativeLimit.java#Xcomp-run-inline    Error. Program `/jdk21_opt/images/jdk/bin/java' timed out (timeout set to 480000ms, elapsed time including timeout handling was 480267ms).
compiler/loopopts/TestPartialPeelAtUnsignedTestsNegativeLimit.java#vanilla             Passed. Execution successful

Do you know if there's a bug or a performance problem? The related issues are already integrated.

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PR Comment: https://git.openjdk.org/jdk21u-dev/pull/728#issuecomment-2180665041