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

[Fei Yang]

On Wed, 6 Aug 2025 17:04:33 GMT, Yuri Gaevsky <duke at openjdk.org> wrote:

> 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.

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PR Comment: https://git.openjdk.org/jdk/pull/17413#issuecomment-3173369066