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

[Wu Yan]

On Sat, 7 Aug 2021 08:40:55 GMT, Andrew Haley <aph at openjdk.org> wrote:

>> Wang Huang has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   fix code style
>
> test/hotspot/gtest/aarch64/aarch64-asmtest.py line 1525:
> 
>> 1523:                         ["stxpw",  "__ stxpw(r6, zr, zr, sp);",                          "stxp\tw6, wzr, wzr, [sp]"],
>> 1524:                         ["dup",    "__ dup(v0, __ T16B, zr);",                           "dup\tv0.16b, wzr"],
>> 1525:                         ["dups",   "__ dups(v0, __ T2S, v1);",                           "mov\ts0, v1.s[0]"],
> 
> This equivalence would be easier to understand as
> `                         ["dups",   "__ dups(v0, __ T2S, v1);",                           "dup\ts0, v1.s[0]"],`

Thanks, I'll fix it.

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