The library supports 4 different problem descriptors:
aoclfftz_prob_desc_f - for single-precision FFTs on LP64 systems
aoclfftz_prob_desc_d - for double-precision FFTs on LP64 systems
aoclfftz_prob_desc_f_64_ - for single-precision FFTs on ILP64 systems
aoclfftz_prob_desc_d_64_ - for double-precision FFTs on ILP64 systems