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

[Xiaohong Gong]

On Fri, 6 Aug 2021 09:48:50 GMT, Wang Huang <whuang at openjdk.org> wrote:

>> * In this issue, we plan to complete all missing implementation for aarch64 neon backend. For example, cast from Byte to Long, cast from Long to Byte, and so on.
>> * It may be a solver of JDK-8269866, or part of it.
>
> 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 229:

> 227:   format %{ " # reinterpret $dst,$src\t# X to S" %}
> 228:   ins_encode %{
> 229:     // Resize the vector from 128-bits or 64-bits to 32-bits. The higher bits

Resize the vector from 128 bits to 32 bits?

src/hotspot/cpu/aarch64/aarch64_neon.ad line 244:

> 242:   format %{ " # reinterpret $dst,$src\t# D to S" %}
> 243:   ins_encode %{
> 244:     // Resize the vector from 128-bits or 64-bits to 32-bits. The higher bits

Resize the vector from 64 bits to 32 bits?

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