RFR: 8322174: RISC-V: C2 VectorizedHashCode RVV Version [v22]

[Yuri Gaevsky]

On Mon, 11 Aug 2025 06:05:15 GMT, Fei Yang <fyang at openjdk.org> wrote:

>> Based on above experiments it looks reasonable to use `m2` grouping.
>
>> Based on above experiments it looks reasonable to use `m2` grouping.
> 
> Thanks for the extra JMH numbers. Yes, I agree that `m2` is more reasonable here.
> That means we won't need to reserve so many vector registers for `instruct varrays_hashcode` in src/hotspot/cpu/riscv/riscv_v.ad.
> So can you free the unused vector registers? Will take a more closer look after that.

Thanks for your review @RealFYang, corrected per your suggestions.

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PR Comment: https://git.openjdk.org/jdk/pull/17413#issuecomment-3191214041