RFR: 8365570: C2 fails assert(false) failed: Unexpected node in SuperWord truncation: CastII [v5]

[Jasmine Karthikeyan]

On Wed, 7 Jan 2026 10:14:05 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

>> Jasmine Karthikeyan has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Use Xcomp test run instead of Warmup(0)
>
> I see timeouts with the test in various configurations, maybe the default timeout should be increased?
> 
> 
> compiler.lib.ir_framework.driver.TestVMException: There were one or multiple errors. Please check stderr for more information.
> 	at compiler.lib.ir_framework.driver.TestVMProcess.throwTestVMException(TestVMProcess.java:251)
> 	at compiler.lib.ir_framework.driver.TestVMProcess.checkTestVMExitCode(TestVMProcess.java:232)
> 	at compiler.lib.ir_framework.driver.TestVMProcess.<init>(TestVMProcess.java:77)
> 	at compiler.lib.ir_framework.TestFramework.runTestVM(TestFramework.java:879)
> 	at compiler.lib.ir_framework.TestFramework.start(TestFramework.java:839)
> 	at compiler.lib.ir_framework.TestFramework.start(TestFramework.java:431)
> 	at compiler.lib.ir_framework.TestFramework.runWithFlags(TestFramework.java:257)
> 	at compiler.vectorization.TestSubwordTruncation.main(TestSubwordTruncation.java:509)
> 	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
> 	at java.base/java.lang.reflect.Method.invoke(Method.java:565)
> 	at com.sun.javatest.regtest.agent.MainActionHelper$AgentVMRunnable.run(MainActionHelper.java:335)
> 	at java.base/java.lang.Thread.run(Thread.java:1516)
> 
> JavaTest Message: Test threw exception: compiler.lib.ir_framework.driver.TestVMException
> JavaTest Message: shutting down test
> 
> result: Error. "driver" action timed out with a timeout of 480 seconds on agent 136; but completed after timeout - suppressed status: "Failed. `main' threw exception: compiler.lib.ir_framework.driver.TestVMException: There were one or multiple errors. Please check stderr for more information."
> 
> 
> test result: Error. "driver" action timed out with a timeout of 480 seconds on agent 136; but completed after timeout - suppressed status: "Failed. `main' threw exception: compiler.lib.ir_framework.driver.TestVMException: There were one or multiple errors. Please check stderr for more information."

Thank you for running testing @TobiHartmann! I've pushed a commit that reverts the change made to run with `-Xcomp` directly, so hopefully the timeout is prevented.

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PR Comment: https://git.openjdk.org/jdk/pull/26827#issuecomment-3721777830