RFR: 8351140: RISC-V: Intrinsify Unsafe::setMemory [v10]

[Feilong Jiang]

On Sun, 18 May 2025 11:56:24 GMT, Anjian-Wen <duke at openjdk.org> wrote:

>> src/hotspot/cpu/riscv/stubGenerator_riscv.cpp line 1743:
>> 
>>> 1741:     // Handle copies less than 8 bytes
>>> 1742:     __ bind(L_fill_elements);
>>> 1743:     __ beqz(count, L_exit);
>> 
>> If `count` may be zero, we can put `beqz` at the beginning of the stub.
>
> Thanks，but I think there may be relatively fewer case when count is equal to 0 compare to not equal to 0，and it may not worth to execute a beqz at the entrance？

This makes sense, so let's just leave it as it is.

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PR Review Comment: https://git.openjdk.org/jdk/pull/23890#discussion_r2094905144