[vectorIntrinsics] RFR: 8259604: Change the implementation of loadV_partial and storeV_partial in Aarch64-SVE backend

[Wang Huang]

On Thu, 21 Jan 2021 02:37:05 GMT, Ningsheng Jian <njian at openjdk.org> wrote:

>> Now, the implementation of `loadV_partial` is :
>> mov $tmp1, 0
>> mov $tmp2, vector_length
>> sve_whilelo $pTmp, $tmp1, $tmp2
>> sve_ldr $dst, $pTmp, $mem
>> However, we can encode register `zr` in instruction `sve_whilelo` instead of getting from the first mov instruction.
>> 
>> The new implementation is :
>> mov $tmp, vector_length
>> sve_whilelo $pTmp, zr, $tmp
>> sve_ldr $dst, $pTmp, $mem
>> From this changing, we reduce a mov instruction and a temporary variable($tmp2 ).
>
> Marked as reviewed by njian (Committer).

> LGTM, thanks!

Thank you for your review.

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PR: https://git.openjdk.java.net/panama-vector/pull/32