RFR: 8370519: C2: Hit MemLimit when running with +VerifyLoopOptimizations [v3]

[Benoît Maillard]

On Tue, 2 Dec 2025 11:16:50 GMT, Roland Westrelin <roland at openjdk.org> wrote:

>> test/hotspot/jtreg/compiler/c2/TestVerifyLoopOptimizationsHighMemUsage.java line 28:
>> 
>>> 26:  * @bug 8370519
>>> 27:  * @summary C2: Hit MemLimit when running with +VerifyLoopOptimizations
>>> 28:  * @run main/othervm -XX:CompileCommand=compileonly,*TestVerifyLoopOptimizationsHighMemUsage*::* -XX:-TieredCompilation -Xbatch
>> 
>> Out of curiosity, have you try reducing the test with `creduce`? I fixed a similar issue in [JDK-8366990](https://bugs.openjdk.org/browse/JDK-8366990), and initially reviewers were concerned about the long compilation time. I was able to get decent results with `creduce` by using  `-XX:CompileCommand=memlimit`. Not sure if it's worth doing here though.
>
> I don't have `creduce` set up. I tried minimizing the test case by hand but it was fairly time consuming. It currently runs in 30s on a fairly fast machine.

I am giving it a try on my setup, I'll let you know if something comes up.

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PR Review Comment: https://git.openjdk.org/jdk/pull/28581#discussion_r2605912924