[jdk17u-dev] RFR: 8284578: Relax InterpreterCodelet stub alignment [v3]

[Dmitry Chuyko]

On Thu, 20 Oct 2022 07:38:12 GMT, Dmitry Chuyko <dchuyko at openjdk.org> wrote:

>> This change improves density of interpreter codelets. I have no intent to backport JDK-8281467 [1] (Allow larger OptoLoopAlignment and CodeEntryAlignment), entire JDK-8283298 [2] (productize CodeCacheSegmentSize) and its related change in stubRoutines.cpp JDK-8282355 [3].
>> 
>> However I suppose that Modification of MethodHandles::generate_adapters() from JDK-8283298 which makes blob size more accurate is related to this fix, so I included it here. JDK-8283298 modifications of TemplateInterpreter::initialize_stub() are overwritten by the changes from the original JDK-8284578 patch.
>> 
>> So this patch consists of
>> - Original JDK-8284578 altered to be applicable without JDK-8283298 and JDK-8264207 [4] (can be backported afterwards).
>> - MethodHandles::generate_adapters() and copyrights from JDK-8283298.
>> 
>> Testing: tier1, tier2 on x86 and aarch64 (release)
>> 
>> [0] https://bugs.openjdk.org/browse/JDK-8284578
>> [1] https://bugs.openjdk.org/browse/JDK-8281467
>> [2] https://bugs.openjdk.org/browse/JDK-8283298
>> [3] https://bugs.openjdk.org/browse/JDK-8282355
>> [4] https://bugs.openjdk.org/browse/JDK-8264207
>
> Dmitry Chuyko has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains one commit:
> 
>   Backport 2241a057050ed521cfbfbe8a758353e621dee15f

As suggested, the JDK-8283298 is made in 17u first and this backport is re-implemented on top of it (https://github.com/openjdk/jdk17u-dev/commit/fe4819b5eb25e97b459aded9e1ab93586445b301)

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PR: https://git.openjdk.org/jdk17u-dev/pull/753