On Mon, 26 Aug 2024 12:07:02 GMT, Per Minborg <pminb...@openjdk.org> wrote:
>> Per Minborg has updated the pull request incrementally with one additional >> commit since the last revision: >> >> Add a comment about the old switch type > > Here is what it looks like for Windows x64: > >  > Hi @minborg as #16760 has shown, handling small chunks in Java can be > beneficial, but AFAIK Unsafe::setMemory has been intrinsified already at > #18555, so I'm surprised that should provide some benefit now. I think the cost of transitioning to native code is what gives us this opportunity. So, there is always a fairly constant performance hit to transition to native code. Once native, the actual filling performance is way better in native code. The cut-off size lies appears to be close to 8 bytes and hence, this PR handles 0 <= length < 7 specifically. ------------- PR Comment: https://git.openjdk.org/jdk/pull/20712#issuecomment-2310232722
