RFR: 8348868: AArch64: Add backend support for SelectFromTwoVector [v4]

[Andrew Haley]

On Wed, 25 Jun 2025 06:07:31 GMT, Xiaohong Gong <xgong at openjdk.org> wrote:

>> Bhavana Kilambi has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Addressed review comments
>
> src/hotspot/cpu/aarch64/aarch64_vector.ad line 255:
> 
>> 253:       // the default VectorRearrange + VectorBlend is generated as the performance of the default
>> 254:       // implementation was slightly better/similar than the implementaion for SelectFromTwoVector.
>> 255:       // As the SVE2 "tbl" instruction in unpredicated and partial operations cannot be generated
> 
> `in` -> `is`

"as" -> "because".
Consider the difference between "as I was walking home, the Perseid meteor shower produced a spectacular display" and "because I was walking home, the Perseid meteor shower produced a spectacular display".

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PR Review Comment: https://git.openjdk.org/jdk/pull/23570#discussion_r2166307149