default INDEX_TYPE for arrays

[rrsettgast]

figure out what the best INDEX_TYPE for arrays is on each platform. I notice all the index types I see in cuda examples are "int". Does that mean that we should be using "int" indices when running cuda kernels? Perhaps this should be a platform dependent type?

[artv3]

I chatted with another developer about this. The main benefit of using std:ptrdiff is that it will always be as long as an array needs to be and the compiler doesn't have to worry of overflowing.

[rrsettgast]

who was the developer, and was there any discussion of speed?

[artv3]

I chatted with Jason Burmark about this. I'm not sure if it matters too much in CUDA.