RFR: 8355585: Aarch64: Add aarch64 backend for Float16 vector operations [v3]

[Hao Sun]

On Thu, 15 May 2025 15:30:43 GMT, Bhavana Kilambi <bkilambi at openjdk.org> wrote:

>> This patch adds aarch64 backend (both Neon and SVE) for FP16 vector operations - add, mul, sub, div, min, max, sqrt and fma.
>> 
>> Testing:
>> JTREG tests - hotspot_all, jdk (tier 1-3) and langtools (tier 1) pass on aarch64 which also includes the JTREG test to test the FP16 vector operations - `test/hotspot/jtreg/compiler/vectorization/TestFloat16VectorOperations.java`
>
> Bhavana Kilambi has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Remove additional spaces in the aarch64_vector_ad.m4 file

Thanks for your update. LGTM.

-------------

Marked as reviewed by haosun (Committer).

PR Review: https://git.openjdk.org/jdk/pull/25096#pullrequestreview-2849130327