On Wed, 25 Nov 2020 03:31:36 GMT, Vladimir Kozlov <k...@openjdk.org> wrote:
> JDK-8188055 added the function Reference.refersTo. For performance, the
> supporting native methods Reference.refersTo0 and PhantomReference.refersTo0
> should be intrinsified by C2.
>
> Initial patch was prepared by @fisk.
>
> Tested hs-tier1-4. Added new compiler tests to test intrinsics.
>
> Ran new test with Shenandoah. Found only one issue. As result I disable
> PhantomReference::refersTo intrinsic for COOP+ Shenandoah combination.
> Someone from Shenandoah team have to test changes if that is enough.
src/hotspot/share/opto/c2compiler.cpp line 476:
> 474: if (UseCompressedOops && UseShenandoahGC) return false;
> 475: #endif
> 476: break;
Is this intended to disable the intrinsic on all non-64-bit platforms? Is that
only for Shenandoah 64-bit? I wonder if it should just be:
case vmIntrinsics::_PhantomReference_refersTo0:
if (UseCompressedOops && UseShenandoahGC) return false;
break;
-------------
PR: https://git.openjdk.java.net/jdk/pull/1425
