RFR: 8284960: Integration of JEP 426: Vector API (Fourth Incubator) [v3]

[Jatin Bhateja]

On Wed, 18 May 2022 23:28:22 GMT, Vladimir Ivanov <vlivanov at openjdk.org> wrote:

>> Its more of a chicken-egg problem here, for masked reverse operation, Reverse IR node is followed by a Blend Node, thus in such a case doing an eager Identity transform in Reverse::Identity will not work, also deferring this to blend may also not work since it could be a non-masked reverse operation, we could have handled it as a special case in inline_vector_nary_operation, but handling such special case in final graph reshaping looked more appropriate.
>> 
>> https://github.com/openjdk/panama-vector/pull/182#discussion_r845678080
>
> Do you mean it's important to apply the transformation at the right node (pick the right node as the root) and it is hard to make a decision during GVN?

Yes, that what I meant.

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PR: https://git.openjdk.java.net/jdk/pull/8425