RFR: 8348868: AArch64: Add backend support for SelectFromTwoVector

[Xiaohong Gong]

On Thu, 5 Jun 2025 08:03:02 GMT, Bhavana Kilambi <bkilambi at openjdk.org> wrote:

> > Good job @Bhavana-Kilambi ! Generally looks good to me. Just some minor issues that I have left the comments. Besides, could you please add some IR tests for this optimization? Thanks!
> 
> Hi @XiaohongGong , there are tests already for this operation under `jdk/jdk/incubator/vector` for all the types and sizes to verify the results. Did you mean IR tests for verifying if the correct backend match rule is being generated ?

Yes, I think adding an IR check tests for this operation will be better. I think checking the mid-end IR is enough.

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PR Comment: https://git.openjdk.org/jdk/pull/23570#issuecomment-2947606572