RFR (S): 8200233: Simple G1 evacuation path performance enhancements

[Stefan Johansson]

Looks good,
Stefan

On 2018-03-26 13:48, Thomas Schatzl wrote:
> Hi all,
>
>    can I have reviews for these very tiny (and ultimately note really
> measureable) improvements to the G1 evacuation path?
>
> They are:
>
> - some stores can be made OOP_NOT_NULL
> - the path for compressed/uncompressed oops when popping elements from
> the task queue during evacuation can be specialized: compressed oops
> are never array oops so saving the useless test
> - some load of the "from" region in the evacuation path can be delayed
> and in many cases actually avoided
>
> CR:
> https://bugs.openjdk.java.net/browse/JDK-8200233
>
> Webrev:
> http://cr.openjdk.java.net/~tschatzl/8200233/webrev/
>
> Testing:
> hs-tier-1
>
> Thanks,
>    Thomas