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

[Xiaohong Gong]

On Fri, 5 Mar 2021 02:16:10 GMT, Jie Fu <jiefu at openjdk.org> wrote:

> Good job!
> Thanks @XiaohongGong and @nsjian .
> 
> Just wondering: is there any performance number before and after this enhancement?

Thanks for looking at this PR @DamonFool . Currently we only runs a small part of JMH benchmarks (`ADDMasked`) internally. And since the existing cases are simple which focus on single API operations, the performance can improve but the number is not so obvious (about 6% ~ 13% for integer types). Also we still have many missing masking supports, so we think it's too early to run all the benchmarks. 

> There seems some code duplication between inline_vector_nary_operation and inline_vector_nary_mask_operation.
> Is it possible to support mask operations in inline_vector_nary_operation(int n)?

This is a temporary state since we only tries the masking binary with this solutions. So yes, these two functions can be merged into one. And we will do this once unary/ternary masked operations are supported in future. Thanks!

> 
> Thanks.

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