[vectorIntrinsics+mask] RFR: 8264563: Add masked vector intrinsics for binary/store operations [v5]

[Vladimir Ivanov]

On Wed, 21 Apr 2021 10:03:54 GMT, Xiaohong Gong <xgong at openjdk.org> wrote:

>> src/hotspot/share/opto/vectornode.cpp line 755:
>> 
>>> 753:     }
>>> 754:   }
>>> 755:   return StoreNode::Ideal(phase, can_reshape);
>> 
>> Can you elaborate, please, why this change is needed?
>
> Oh, I just noticed that the `StoreVectorMaskedNode` is extended from `StoreNode`, which has some optimizations in `StoreNode::Ideal`. I'm worried that overriding the `StoreNode::Ideal` for `StoreVectorMaskedNode` might miss the optimizations in `StoreNode::Ideal`. I will reconsider this in more details. Thanks!

It makes sense to handle it separately and fix it in the mainline.

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PR: https://git.openjdk.java.net/panama-vector/pull/57