RFR: 8331575: C2: crash when ConvL2I is split thru phi at LongCountedLoop [v2]

[Roland Westrelin]

On Wed, 8 May 2024 07:10:25 GMT, Christian Hagedorn <chagedorn at openjdk.org> wrote:

>> test/hotspot/jtreg/compiler/splitif/TestLongCountedLoopConvL2I.java line 31:
>> 
>>> 29:  *                   -XX:+StressGCM -XX:StressSeed=92643864 TestLongCountedLoopConvL2I
>>> 30:  * @run main/othervm -XX:-BackgroundCompilation -XX:-TieredCompilation -XX:-UseOnStackReplacement
>>> 31:  *                   -XX:+StressGCM TestLongCountedLoopConvL2I
>> 
>> Would it make sense to have a run that allows OSR?
>
> You should also add `-XX:+UnlockDiagnosticVMOptions` for the stress flag.

Done in new commit.

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PR Review Comment: https://git.openjdk.org/jdk/pull/19086#discussion_r1598467494