[vectorIntrinsics] RFR: 8265916: Add StoreVectorScatter nodes implementation for Arm SVE [v4]

[Xiaohong Gong]

On Thu, 29 Apr 2021 07:20:37 GMT, Wang Huang <whuang at openjdk.org> wrote:

>> * add `sve_st1w_scatter` and `sve_st1w_scatter`
>> * implement `scatterI` and `scatterL`
>> * `load gather partial` and `store scatter partial` are not contained in this patch, and they will be in next patches
>
> Wang Huang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   fix style

src/hotspot/cpu/aarch64/aarch64_sve.ad line 229:

> 227:       case Op_ExtractUB:
> 228:       // Vector API specific
> 229:         return false;

Put the comment above "case Op_StoreVectorScatter" ?  Or remove "case Op_StoreVectorScatter" under "Op_VectorLoadConst" ?

src/hotspot/cpu/aarch64/aarch64_sve_ad.m4 line 226:

> 224:       case Op_StoreVectorScatter:
> 225:       case Op_VectorLoadConst:
> 226:         return false;

VectorLoadConst is not implemented yet, isn't it?

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PR: https://git.openjdk.java.net/panama-vector/pull/73