RFR: 8282874: Bad performance on gather/scatter API caused by different IntSpecies of indexMap

[Joshua Zhu]

On Thu, 10 Mar 2022 04:01:39 GMT, Jie Fu <jiefu at openjdk.org> wrote:

> I would suggest adding a jtreg test for this fix if it is possible. Thanks.

@DamonFool thanks for your suggestion.
IMO a benchmark would be more suitable for this case.
In fact, besides this fix, there exists another issue that will also affect the performance since delay vector inlining.
After my initial triage, it may relate to ConstraintCastNode's dependency.
I will add a benchmark after figuring out the solution to it.

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PR: https://git.openjdk.java.net/jdk/pull/7757