[aarch64-port-dev ] RFR: 8224187 Refactor arraycopy_prologue to allow ZGC read barriers on arraycopy

[Stuart Monteith]

Hello Roman,
  I don't think there is any disagreement about Erik's proposal.
However, I'd like to understand what the time-frame is for Erik's
proposal would be before abandoning this patch.  I am aiming for ZGC
for aarch64 to get merged before rampdown phase 1 in mid-June in order
for it to be in JDK 13 as an experimental option.. I believe this
change is minimal, it wouldn't add any additional effort onto Erik's
proposal, and if nothing else brings aarch64 more in line with the
other platforms.

BR,
   Stuart

On Mon, 20 May 2019 at 11:40, Roman Kennke <rkennke at redhat.com> wrote:
>
> I'd rather see Erik's proposal implemented to make the GC generate the
> whole path to begin with. Otherwise we'd band-aid for ZGC now, and later
> have to band-aid again for Shenandoah. See discussion for JDK-8223240
> and in your aarch64 on ZGC thread.
>
> Roman
>
> > Hello,
> >    On aarch64 the signature for
> > barrierSetAssembler::arraycopy_prologue needs to be changed in order
> > accept the source as well as the destination array for ZGC's barriers.
> >
> > The bug:
> >  https://bugs.openjdk.java.net/browse/JDK-8224187
> > and the patch:
> >   http://cr.openjdk.java.net/~smonteith/8224187/webrev.0/
> >
> >
> > BR,
> >    Stuart
> >
>