RFR: 8319184: RISC-V: improve MD5 intrinsic [v2]

[Antonios Printezis]

On Wed, 1 Nov 2023 17:14:49 GMT, Hamlin Li <mli at openjdk.org> wrote:

>> Antonios Printezis has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   changes based on code review
>
> src/hotspot/cpu/riscv/stubGenerator_riscv.cpp line 3967:
> 
>> 3965:     // a += ac
>> 3966:     __ mv(rtmp3, t);
>> 3967:     __ addw(a, a, rtmp3);
> 
> Could these 2 lines could be replaced with addiw? although no performance gain, but could be simpler.

The constants are too big for a single `addiw` instruction. So, it will be translated to this form anyway.

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PR Review Comment: https://git.openjdk.org/jdk/pull/16453#discussion_r1382077293