CUDA Fortran for Scientists and Engineers

Appendix C

Calling CUDA C from CUDA Fortran

There are several reasons one would want to call CUDA C code from CUDA Fortran: (1) to leverage code already written in CUDA C, especially libraries where an explicit CUDA Fortran interface is not available, and (2) to write CUDA C code that uses features that are not available in CUDA Fortran. We provide an example for each of these use cases in this appendix.

C.1 Calling CUDA C libraries

With the advent of the iso_c_binding module in Fortran 2003, calling CUDA C from CUDA Fortran is straightforward. We demonstrate the procedure for specifying an interface using the CUBLAS library. Note that this is not needed as of the 11.7 release of the compilers, since one simply has to use the cublas module included ...