[vectorIntrinsics] RFR: 8263424: Extend vector size support for SVE [v2]

[Ningsheng Jian]

On Mon, 15 Mar 2021 02:01:23 GMT, Xiaohong Gong <xgong at openjdk.org> wrote:

>> Ningsheng Jian has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains three commits:
>> 
>>  - No need to check type for AddReductionVL
>>  - Merge 'panama-vector/vectorIntrinsics' into HEAD
>>  - 8263424: Extend vector size support for SVE
>>    
>>    This patch adds support of vector operations with size less than
>>    MaxVectorSize for SVE. Basically, for general vector operations, we
>>    simply keep original operations, i.e. doing a full vector length
>>    operations, but for load/store and reduction operations, we use
>>    predicate operations to make sure only vector elements in the size
>>    limit are loaded/stored/calculated.
>>    
>>    This patch also fixes an SVE load/store addressing mode usage issue.
>>    For SVE load/store scalar plus immediate, the immediate displacements
>>    are calculated by both vector element size and memory element size. As
>>    the existing vmemA_immIOffset4 and vmemA_immLOffset4 does not take into
>>    account of the vector and memory element size difference, we should not
>>    use them for extend/narrow forms.
>>    
>>    Tested with tier1 and jdk:tier3. jdk/incubator/vector cases have also
>>    been verified with different MaxVectorSize options.
>
> Marked as reviewed by xgong (Committer).

@XiaohongGong @Wanghuang-Huawei Thanks for the review! I have resolved the merge conflicts.

-------------

PR: https://git.openjdk.java.net/panama-vector/pull/49