RFR: 8286302: Port JEP 425 to PPC64 [v7]

[Richard Reingruber]

On Tue, 22 Nov 2022 02:29:41 GMT, Leonid Mesnik <lmesnik at openjdk.org> wrote:

>> Richard Reingruber has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Cleanup BasicExp test
>
> test/jdk/jdk/internal/vm/Continuation/BasicExp.java line 193:
> 
>> 191:             compLevel = CompilerWhiteBoxTest.COMP_LEVEL_FULL_OPTIMIZATION;
>> 192:             // // Run tests with C1 compilations
>> 193:             // compLevel = CompilerWhiteBoxTest.COMP_LEVEL_FULL_PROFILE;
> 
> Any reasons why the test is executed with C2 only? And is -XX:-TieredCompilation required if optimization level and compilation are controlled with WB?

It doesn't matter that much which compiler is used. What really matters is to have compiled frames at specific locations when freezing/thawing. The test cases control which methods are compiled and which are not. I don't want TieredCompilation to interfere with that.

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PR: https://git.openjdk.org/jdk/pull/10961