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

[Xiaohong Gong]

On Fri, 12 Mar 2021 13:38:43 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/type.cpp line 686:
> 
>> 684:     TypeVMask::VMASK = TypeVMask::make(T_BYTE, Matcher::max_vector_size(T_BYTE));
>> 685:   }
>> 686: 
> 
> Instead of creating a new type altogether,  we can extended the mask type from the existing TypeVect class.
> This is being done for X86 base patch, currently under review:
> https://github.com/openjdk/jdk/pull/2768
> 
> I think same type (TypeVectMask) can be used for SVE support.

Yes, there is some discussions focus on the mask type definition in jdk/jdk master. It's a good idea to define a subclass of `TypeVect`. It seems this can be used for SVE, but I'm not quite sure and we will have a try internally. Hope we can get a final point on the mask type first. Thanks!

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