On Thu, 3 Mar 2022 14:43:52 GMT, Lutz Schmidt <l...@openjdk.org> wrote:

> I don't think the intrinsic has to be implemented on every target, but AFAICR 
> it does have to be declared as an intrinsic in HotSpot.

Yeah, I got confused. To me it looks like a declaration of intent, and thought 
the only strict requirement was that HotSpot can't define an intrinsic if 
there's no annotation. It also seems odd to hardwire it to what HotSpot does - 
wasn't the purpose of renaming from `@HotSpotIntrinsicCandidate` to decouple 
things a bit better?

Either way.. I'm re-running tests and benchmarks and seeing if I can improve 
the aarch64 impl to return a decent approximation rather than always-0 when 
there are negative bytes.

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PR: https://git.openjdk.java.net/jdk/pull/7231

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