[PD] array copy speed test

[carmen]

> > Anyone feel like SIMDifiying [arraycopy] (hint hint ;).  I suppose
> > vasp is a SIMD version of [arraycopy].
> 
> SIMD doesn't help in copying data. And in any case, introducing
> platform dependend code

is it? Linux Windows Macosx all run on x86 anymore, and GCC works great on each. i never understood this argument against SIMD. im thinking Miller just wanted PD to be slow :)