Function relabel

src/backend/cuda/kernel/regions.hpp:100–104

// do not choose zero, which indicates invalid.
template<typename T>
__device__ __inline__ static T relabel(const T a, const T b) {
    T aa = (a == 0) ? arrayfire::cuda::maxval<T>() : a;
    T bb = (b == 0) ? arrayfire::cuda::maxval<T>() : b;
    return min(aa, bb);
}

// Calculates the number of warps at compile time
template<unsigned thread_count>