On Wed, 18 May 2022 23:28:22 GMT, Vladimir Ivanov <vliva...@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.


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

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