RFR: 8321003: RISC-V: C2 MulReductionVI [v5]

[Hamlin Li]

On Wed, 19 Feb 2025 07:24:31 GMT, Robbin Ehn <rehn at openjdk.org> wrote:

>> Thanks for the update. So now the FP reduce multiply will only apply to the Vector-API use case. Did you check the auto-vectorization use case? I suppose the two tests `ProdRed_Double.java` & `ProdRed_Float.java` which are enabled for riscv64 by this PR won't work with this update.
>
> It would be nice to get auto-vector also.

@robehn Yes, it would be, but currenlty there is no easy way to do it. Maybe we can figure out how to do it in the future, but it would not be in this pr.

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PR Review Comment: https://git.openjdk.org/jdk/pull/23580#discussion_r1961734922