RFR: 8348868: AArch64: Add backend support for SelectFromTwoVector [v3]

[Xiaohong Gong]

On Wed, 18 Jun 2025 07:46:09 GMT, Bhavana Kilambi <bkilambi at openjdk.org> wrote:

>> Yeah, I noticed this as well. Since these types for NEON has been excluded in above function `match_rule_supported_vector()`. Can we just ignore such types? Besides, you have also added the type assertion in the macro assembler implementation.
>
> Ok, I can do that (although I hope it won't be ambiguous/confusing for someone who is just going through the match rules to understand the implementation).

Thanks! It's up to you. Current version just makes the predication look more complex and un-readable.

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PR Review Comment: https://git.openjdk.org/jdk/pull/23570#discussion_r2153905481