[9] RFR(M): 8076112: Add @HotSpotIntrinsicCandidate annotation to indicate methods for which Java Runtime has intrinsics

Andrew Haley aph at redhat.com
Mon Jun 29 13:01:55 UTC 2015

On 06/29/2015 01:38 PM, Doug Simon wrote:

> I seems just plain wrong for an intrinsic to not implement the same
> semantics as the intrinsified method. I would expect an intrinsic to
> perform all necessary runtime checks and only have the compiler omit
> them if it can prove they are unnecessary. If all intrinsics obeyed
> this contract, then there’s no need for the
> @HotSpotIntrinsicCandidate annotation from a semantics
> perspective. And in terms of the keeping HotSpot in sync with the
> JDK, the responsibility should fall entirely on HotSpot to check
> that its intrinsics correspond to existing methods.

Don't you think you're being rather idealistic?  The other side of the
argument is that it's much easier to write and maintain the
arg-checking code if it's written in Java, and it also has the
advantage that it benefits from profile data to guide the JIT.


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