RFR: 8339643: Port JEP 404 to RISC-V [v2]

[Kelvin Nilsen]

On Fri, 13 Sep 2024 03:53:18 GMT, Fei Yang <fyang at openjdk.org> wrote:

>> src/hotspot/cpu/riscv/gc/shenandoah/shenandoahBarrierSetAssembler_riscv.cpp line 579:
>> 
>>> 577:   __ bind(L_loop);
>>> 578:   __ add(tmp, start, count);
>>> 579:   __ sb(zr, Address(tmp));
>> 
>> Do we want to condition behavior on UseCondCardMark?  Other architectures are considering this.
>
> Seems still under discussion? I will provide further update once it's resolved.

That's fine.  It is an optimization that might perform better when/if implemented.

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PR Review Comment: https://git.openjdk.org/shenandoah/pull/493#discussion_r1759383061