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

[Jie Fu]

On Wed, 9 Mar 2022 12:33:49 GMT, Joshua Zhu <jzhu at openjdk.org> wrote:

> I came across a performance issue when using scatter store VectorAPI for Integer and Long in the same application. The poor performance was caused by vector intrinsic inlining failure because of non-determined IntSpecies for a constant VectorShape of IndexMap in this scenario.
> As discussion at https://github.com/openjdk/jdk/pull/7721 , I change the code in VectorAPI.
> Please help review.

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

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