RFR: 8319716: RISC-V: Add SHA-2

[Robbin Ehn]

On Tue, 21 Nov 2023 10:04:09 GMT, Fei Yang <fyang at openjdk.org> wrote:

>> If you consider register renaming load should be enable to start even earlier.
>> E.g. load into vX, then rename vX to v15 after the add that uses v15.
>
> Thanks. Now I see what you mean. That makes sense to me. It will be interesting to see how the performance numbers may vary. Unfortunately, I don't have access to the hardware yet.

We don't either have such hardware, we simulate via gem5.
Ventana v2 should have 15 wide pipeline with RVV 1.0 how knows how this will execute on such :)

As we don't know I think you are correct in we should write the most readable version first.
And later we can apt these for hwprobe triplet of vendor/arch/impl if we think that it's worth it.

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PR Review Comment: https://git.openjdk.org/jdk/pull/16562#discussion_r1400399603