RFR: 8362564: hotspot/jtreg/compiler/c2/TestLWLockingCodeGen.java fails on static JDK on x86_64 with AVX instruction extensions [v2]

[Vladimir Kozlov]

On Tue, 29 Jul 2025 18:17:14 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Jiangli Zhou has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Address @eastig review comment:
>>   - Reverted change for moving the assert. Added code_size, buffer size and free to the assert output.
>
> There was no GHA testing for this.

> @vnkozlov Do you refer to the PR testing? It's https://github.com/openjdk/jdk/pull/26395/checks, thanks.

Yes, that. I did not realize that GitHub removes it from main PR tab after integration.

Good, it was tested.  I think GitHub actions use AVX512 machines.  But I remember that static build testing was excluded.

First, I am fine with fix you pushed. But it is strange.

There should be no difference in stubs sizes running with regular JDK on avx512 machine and static JDK. I don't see how we don't trigger this issue in our testing - we regularly running on AVX512 machines.

Do you have additional code somewhere in macro assembler for static build? Is it possible to compare assembler code?
I see you posted sizes in bug report. Can you compare code for `StubRoutines::forward_exception()` which has smallest size to see what is difference.

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PR Comment: https://git.openjdk.org/jdk/pull/26395#issuecomment-3134218373