RFR: 8319716: RISC-V: Add SHA-2 [v2]

[Robbin Ehn]

On Thu, 9 Nov 2023 17:35:50 GMT, Hamlin Li <mli at openjdk.org> wrote:

>> Robbin Ehn has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains four additional commits since the last revision:
>> 
>>  - Flag fixes
>>  - Merge branch 'master' into sha256
>>  - Share code
>>  - SHA-2
>
> src/hotspot/cpu/riscv/stubGenerator_riscv.cpp line 4348:
> 
>> 4346: 
>> 4347:     //--------------------------------------------------------------------------------
>> 4348:     // Quad-round 0 (+0, v10->v11->v12->v13)
> 
> similar comments as generate_sha256_implCompress about group the rounds in a loop.

Now rounds share code.

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PR Review Comment: https://git.openjdk.org/jdk/pull/16562#discussion_r1407829476