RFR: 8348868: AArch64: Add backend support for SelectFromTwoVector [v15]

[Bhavana Kilambi]

On Tue, 22 Jul 2025 10:01:02 GMT, erifan <duke at openjdk.org> wrote:

>> Bhavana Kilambi has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Addressed review comments to half the number of match rules
>
> src/hotspot/cpu/aarch64/aarch64.ad line 5091:
> 
>> 5089:   format %{ %}
>> 5090:   interface(REG_INTER);
>> 5091: %}
> 
> Ditto, I tend to moving this change `after line 5101` of this file.

Same explanation here. the registers are matching `vReg` which can be either `vecA`, `vecD` or `vecX` and thus I placed the operand definitions right after the `vReg` definition.

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PR Review Comment: https://git.openjdk.org/jdk/pull/23570#discussion_r2227696114