[vectorIntrinsics] RFR: 8258072: Add Reinterpret nodes implementation for Arm SVE [v2]

[Ningsheng Jian]

On Thu, 7 Jan 2021 02:26:20 GMT, Wang Huang <whuang at openjdk.org> wrote:

>> Add reduction nodes support for Arm SVE. Add the backend codegen for node like "VectorReinterpret" .
>> In this patch, We implement these instructs: 
>> *  reinterpret (src == dst)
>> *  reinterpretResize, including,
>>   1）  reinterpret（Expand） (src < dst)
>>   2） reinterpret（Shrink） (src > dst)
>> 
>> At the same time, we fix a bug (JDK-8258989) because it is not merged in panama-vector/vectorIntrinsics.
>
> Wang Huang has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR.

@Wanghuang-Huawei Please do not have a force-push as it breaks review history.

src/hotspot/cpu/aarch64/aarch64_sve_ad.m4 line 35:

> 33: define(`TYPE2DATATYPE',
> 34: `ifelse($1, `B', `BYTE',
> 35:         $1, `S', `SHORT',

Not used in this patch?

src/hotspot/cpu/aarch64/aarch64_sve.ad line 387:

> 385:     __ sve_whilelo(as_PRegister($pTmp$$reg), __ B,
> 386:                    zr, as_Register($tmp$$reg));
> 387:     __ sve_cpy(as_FloatRegister($dst$$reg), __ B, ptrue, 0, false);

Is this sve_dup()?

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PR: https://git.openjdk.java.net/panama-vector/pull/30