RFR: 8259948: Aarch64: Add cast nodes for Aarch64 Neon backend [v2]

[Wu Yan]

On Tue, 10 Aug 2021 09:47:03 GMT, Eric Liu <eliu at openjdk.org> wrote:

>> Wang Huang has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   fix code style
>
> src/hotspot/cpu/aarch64/aarch64_neon.ad line 308:
> 
>> 306: %}
>> 307: 
>> 308: instruct vcvt2Sto2I(vecD dst, vecD src)
> 
> Do we really need this rule? There still have some mid-end issues remained[1] that some vector sizes could be marked as unsupported in advance.  
> 
> I suppose some rules are useless after that fix.
> 
> [1] https://github.com/openjdk/jdk/pull/3507/files#r623691031

This rule has fixed the problem you mentioned. As for other problems, I'm not sure whether they still exist.

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PR: https://git.openjdk.java.net/jdk/pull/4839