[vectorIntrinsics] RFR: 8263417: Add Extract integer nodes implementation for Arm SVE

[Wang Huang]

On Mon, 15 Mar 2021 08:11:38 GMT, Ningsheng Jian <njian at openjdk.org> wrote:

>> * Add Extract integer nodes implementation for Arm SVE, like ExtractB/ExtractS/ExtractI/ExtractL
>> * add `sve_lasta(Register, SIMD_RegVariant, PRegister,  FloatRegister)` & `sve_lastb`
>
> src/hotspot/cpu/aarch64/aarch64_sve.ad line 3004:
> 
>> 3002:   ins_encode %{
>> 3003:     __ movzw(as_Register($tmp$$reg), (int)($idx$$constant));
>> 3004:     __ sve_whilele(as_PRegister($pTmp$$reg), __ B, zr, as_Register($tmp$$reg));
> 
> I think we can use rscratch1 here to save one register. See https://github.com/openjdk/panama-vector/pull/49

OK. Thank you for your review.I will fix it in my next patch. For other `$tmp` in `adfile`, I will create a new issue (JDK-8263578) and try to replace them.

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PR: https://git.openjdk.java.net/panama-vector/pull/48