RFR: 8374525: RISC-V: Several masked float16 vector operations are not supported

[Feilong Jiang]

On Mon, 5 Jan 2026 12:32:13 GMT, Dingli Zhang <dzhang at openjdk.org> wrote:

> Hi,
> Can you help to review this patch? Thanks!
> 
> Currently, the masked versions of the following 8 Float16 operations are not supported.
> But we return true in `Matcher::match_rule_supported_vector_masked` for these operations
> on RISC-V platforms with Zvfh. We need to explicitly disable them on this CPU platform
> to make it clear.
> 
>  Op_AddVHF:
>  Op_SubVHF:
>  Op_MulVHF:
>  Op_DivVHF:
>  Op_MaxVHF:
>  Op_MinVHF:
>  Op_SqrtVHF:
>  Op_FmaVHF:
> 
> When the support for Float16 vector classes is added in VectorAPI and the masked
> Float16 IR can be generated, these masked operations will be enabled and relevant
> backend support added.

Nice catch!

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Marked as reviewed by fjiang (Committer).

PR Review: https://git.openjdk.org/jdk/pull/29035#pullrequestreview-3626694940