RFR: 8321010: RISC-V: C2 RoundVF

[Hamlin Li]

On Wed, 7 Feb 2024 14:11:05 GMT, Vladimir Kempik <vkempik at openjdk.org> wrote:

>> Hi,
>> Can you have a review on this patch to add RoundVF/RoundDF intrinsics?
>> Thanks!
>> 
>> ## Tests
>> 
>> test/hotspot/jtreg/compiler/vectorization/TestRoundVectRiscv64.java test/hotspot/jtreg/compiler/c2/cr6340864/TestFloatVect.java test/hotspot/jtreg/compiler/c2/cr6340864/TestDoubleVect.java test/hotspot/jtreg/compiler/floatingpoint/TestRound.java
>> 
>> test/jdk/java/lang/Math/RoundTests.java
>
> Hello Hamlin, I recall you had licheepi board.
> I would be nice if you can try to measure rvv performance gain with this https://github.com/syntacore/syntaj21/tree/rvv0.7.1
> 
> This PR showed it's not always easy to win perf just by using rvv - https://github.com/openjdk/jdk/pull/17413
> 
> I understand it might not be possible, but would be nice to give it a try (I can share hsdis with support for 0.7.1 if needed)

@VladimirKempik Thanks for your comments, I'll consider it.

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PR Comment: https://git.openjdk.org/jdk/pull/17745#issuecomment-1932276425