[aarch64-port-dev ] RFR: backport volatile put/get and CAS optimization to JDK8

[Andrew Dinn]

Oops, wait a minute, ignore the previous post -- the webrev is
thoroughly borked. The changeset looks ok but the diffs for file
aarch64.ad include all sorts of patches to the pipeline classes which
are not part of the changeset.

I'll post a corrected version as soon as I can work out what went wrong.

regards,


Andrew Dinn
-----------


On 08/10/15 17:11, Andrew Dinn wrote:
> Here is a webrev against the latest aarch64-port-dev/jdk8/hotspot for
> review:
> 
>   http://cr.openjdk.java.net/~adinn/jdk8volcasopt/webrev.00
> 
> It backports the jdk9-aarch64 optimizations which use ldar and stlr for
> volatile gets and puts and unsafe CAS operations to jdk8-aarch64
> 
> So far, I have tested it (successfully) by eyeballing generated code for
> some hand cranked tests that use volatiles and CASes in all 5 relevant
> GC configurations (see below ***) and also running by netbeans and
> eyeballing generated hash table code.
> 
> I am currently running jcstress to fully test it on a Mustang in all GC
> configs.
> 
> Ed, would you be able to check that jcstress works fine on other hardware?
> 
> *** GC configs are
>     -XX:+UseConcMarkSweepGC -XX:+UseCondCardMark
>     -XX:+UseConcMarkSweepGC -XX:-UseCondCardMark
>     -XX:+UseG1GC
>     -XX:+UseParallelGC -XX:+UseCondCardMark
>     -XX:+UseParallelGC -XX:-UseCondCardMark
> 
> regards,
> 
> 
> Andrew Dinn
> -----------
> 
>