ZGC C2 changes

[Erik Österlund]

Hi,

I seemingly forgot to paste the full webrev link for BarrierSetC2 + 
ZBarrierSetC2 combined in a nice spicy soup:
http://cr.openjdk.java.net/~eosterlund/zgc_c2/webrev.03/

Thanks,
/Erik

On 2018-05-09 17:21, Erik Österlund wrote:
> Greetings,
>
> I have done some preliminary work to adapt ZGC to the new BarrierSetC2 
> changes on hotspot-dev.
>
> Here is a patch cherry picking that into ZGC land:
> http://cr.openjdk.java.net/~eosterlund/zgc_c2/webrev.00/
>
> I basically chose my BarrierSetC2 conflict in the merge. This 
> intermediate step does not compile.
>
> After that, the following patch moves >1500 LOC of ZGC-specific 
> compiler poop into ZBarrierSetC2:
>
> http://cr.openjdk.java.net/~eosterlund/zgc_c2/webrev.01/
>
> Here is a full webrev with the result of BarrierSetC2 + ZBarrierSetC2 
> dumped into our repo.
>
> I still need to run a bunch of more tests on this to verify I have not 
> messed things up, but thought I'd throw this out there for faster turn 
> around times so that you can have a look at it. The BarrierSetC2 patch 
> has made its way through hs-tier1 to hs-tier5. There are still traces 
> left of ZGC in the C2 code, but the large bulk of GC code has been 
> moved out of the way. But we need to move the stub generation to 
> ZBarrierSetAssembler::barrier_stubs_init() and stuff like that.
>
> Thanks,
> /Erik