Note: this doesn't work on Cori GPU because it does not supply a single-precision FFTW at the moment. If you want me to fix that, we can build our own FFTW, just let me know.
Note: this doesn't work on Cori GPU because it does not supply a single-precision FFTW at the moment. If you want me to fix that, we can build our own FFTW, just let me know.