RFR (XS): Temporarily disable ArrayCopyLoadStoreMaxElem with UseShenandoahMatrix

[Roman Kennke]

Am 10.03.2017 um 15:41 schrieb Aleksey Shipilev:
> This avoids compiler bug we know about, and let us do more extensive performance
> experiments meanwhile:
>
> diff -r a188e0e43a45 src/share/vm/runtime/arguments.cpp
> --- a/src/share/vm/runtime/arguments.cpp	Fri Mar 10 15:29:45 2017 +0100
> +++ b/src/share/vm/runtime/arguments.cpp	Fri Mar 10 15:39:26 2017 +0100
> @@ -2098,6 +2098,11 @@
>      FLAG_SET_DEFAULT(AlwaysPreTouch, false);
>      FLAG_SET_DEFAULT(ShenandoahAlwaysPreTouch, true);
>    }
> +
> +  if (UseShenandoahMatrix && FLAG_IS_DEFAULT(ArrayCopyLoadStoreMaxElem)) {
> +    warning("UseShenandoahMatrix is enabled, setting
> ArrayCopyLoadStoreMaxElem=0 to avoid compiler bug");
> +    FLAG_SET_DEFAULT(ArrayCopyLoadStoreMaxElem, 0);
> +  }
>  }
>
>  void Arguments::set_gc_specific_flags() {
>
> Thanks,
> -Aleksey
>
>
Makes sense, yes. Please push!

Roman