RFR: 8332603: [PPC64] Improve itable_stub [v4]

[Martin Doerr]

On Sat, 22 Jun 2024 03:35:35 GMT, Amit Kumar <amitkumar at openjdk.org> wrote:

> > I guess the old code uses slightly better instruction sequences which more than compensate the overhead of iterating twice.
> 
> Similar issue I'm facing for s390x as well. We are not getting that much performance improvement as aarch64 & x86 are showing. I'll look further into it.

Thanks for working on it and for investigating. If there's no clear performance gain, I think such changes should better not get integrated. The old code is better readable IMHO. The PRs don't get lost if we close them. We can still reopen them in case we need them.

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PR Comment: https://git.openjdk.org/jdk/pull/19733#issuecomment-2184174124