RFR: 8303279: C2: crash in SubTypeCheckNode::sub() at IGVN split if [v3]

[Roland Westrelin]

On Mon, 3 Jul 2023 05:15:47 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

>> Roland Westrelin has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   review
>
> test/hotspot/jtreg/compiler/splitif/TestCrashAtIGVNSplitIfSubType.java line 28:
> 
>> 26:  * @bug 8303279
>> 27:  * @summary C2: crash in SubTypeCheckNode::sub() at IGVN split if
>> 28:  * @run main/othervm -XX:-TieredCompilation -XX:-BackgroundCompilation -XX:+UnlockDiagnosticVMOptions -XX:+StressIGVN -XX:StressSeed=598200189 TestCrashAtIGVNSplitIfSubType
> 
> Maybe add a `@run` without a fixed seed to give this a chance to still trigger in the future.

Right. I just made that change.

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PR Review Comment: https://git.openjdk.org/jdk/pull/14678#discussion_r1259397707