RFR: 8321010: RISC-V: C2 RoundVF [v2]

[Hamlin Li]

On Mon, 2 Sep 2024 08:38:12 GMT, Ludovic Henry <luhenry at openjdk.org> wrote:

>> @Hamlin-Li: Thanks for the quick update. Considering that saving/restoring for FRM could be expensive, I do wonder if we could gather some performance numbers before we go. I see people are now testing on RVV-1.0 hardwares [1] and I am also trying to get one (AFAIK, more powerful RVV-1.0 hardwares are also coming later this year, SG2044, SG2380, etc.). Also from discussion on [2], I see there are also other approaches available there without flipping the FP rounding mode. But I am not sure if they make sense for our case or work better without actual testing.
>> 
>> [1] https://github.com/openjdk/jdk/pull/18382#issuecomment-2045145255
>> [2] https://github.com/openjdk/jdk/pull/8204
>
> @RealFYang @turbanoff could we please have another review? Thank you!

Thanks @luhenry @robehn for you reviewing!

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PR Comment: https://git.openjdk.org/jdk/pull/17745#issuecomment-2348261551