[vectorIntrinsics] RFR: RFC: Vector API masking support proposal for Arm SVE [v3]

[Xiaohong Gong]

On Fri, 12 Mar 2021 14:47:54 GMT, Jatin Bhateja <jbhateja at openjdk.org> wrote:

>> Xiaohong Gong has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Add mask support for masked binary operations
>
> src/hotspot/share/opto/vectornode.hpp line 870:
> 
>> 868: class VectorCmpMaskGenNode : public VectorMaskNode {
>> 869:  public:
>> 870:   VectorCmpMaskGenNode(Node* in1, Node* in2, ConINode* predicate_node, const TypeVMask* vmask_type) :
> 
> VectorMaskCmpNode compares two vectors and produces comparison results into a vector (for targets which does not supports predicated vectors) or a predicate vector/register.  Can you kindly elaborate the need for this new node.

`VectorCmpMaskGen` is a kind of mask IR which generates predicate register.  The same with `VectorToMask`, we defined a series of mask IRs that are different with the original vector IRs.

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PR: https://git.openjdk.java.net/panama-vector/pull/40