RFR: 8352218: RISC-V: Zvfh requires RVV [v2]

[Fei Yang]

On Wed, 19 Mar 2025 06:50:25 GMT, Robbin Ehn <rehn at openjdk.org> wrote:

>> Hi please consider.
>> 
>> Added case to turn off UseZvfh when no RVV. 
>> Which is the cause of the test issues, zvfh on but no rvv.
>> 
>> Also made all case identical and added no warning when default.
>> Move them to the common init, as the "UseExtension" is not C2 specific.
>> 
>> Manual tested and some random compiler tests.
>> 
>> Thanks, Robbin
>
> Robbin Ehn has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains four additional commits since the last revision:
> 
>  - hwprobe deps
>  - Merge branch 'master' into maxvector_0
>  - Moved to common
>  - Disable UseZvfh when no RVV

Looks good. I like the latest version which makes dependencies between extensions explict in the hwprobe code path. Thanks!

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Marked as reviewed by fyang (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/24094#pullrequestreview-2697232079