RFR: 8357695: RISC-V: Move vector intrinsic condition checks into match_rule_supported_vector

[Feilong Jiang]

On Mon, 26 May 2025 02:52:01 GMT, Dingli Zhang <dzhang at openjdk.org> wrote:

> Hi all,
> Please take a look and review this PR, thanks!
> 
> Currently, the match_rule_supported function in riscv.ad contains checks for vector-related intrinsics (e.g., FmaVF, FmaVD, RoundVF, RoundVD). These checks can be centralized into the match_rule_supported_vector function in the riscv_v.ad file, ensuring consistent handling in their appropriate context.
> 
> ### Testing
> * [x]  Linux riscv64 server release build on SG2042

src/hotspot/cpu/riscv/riscv.ad line 1883:

> 1881:     case Op_CountPositives:    // fall through
> 1882:     case Op_EncodeISOArray:
> 1883:       return UseRVV;

Should we move this part to `riscv_v.ad` too?

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PR Review Comment: https://git.openjdk.org/jdk/pull/25438#discussion_r2106907018