RFR: 8351140: RISC-V: Intrinsify Unsafe::setMemory [v14]

[Hamlin Li]

On Wed, 21 May 2025 09:38:06 GMT, Anjian-Wen <duke at openjdk.org> wrote:

> Thanks for your review! I think the above test results may not fully reflect the difference in the impact of aligned and unaligned on the tail? I understand that if the dest address is aligned, the above aligned section has 0 to 4 less store instructions than the following section. I can remove it and test jmh to see how it performs

Based on your last jmh data (check `MemorySegmentFillUnsafe.unsafe       true       7` and `MemorySegmentFillUnsafe.unsafe      false       7`, and others <= 7, they're the same.
I guess the pipeline and store buffer deal with this continuous stores well enough.

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PR Comment: https://git.openjdk.org/jdk/pull/23890#issuecomment-2897318832