gri_fftw_import_wisdom (); // load prior wisdom from disk
d_plan = fftwf_plan_dft_1d (fft_size,
reinterpret_cast<fftwf_complex *>(d_inbuf),
gri_fftw_import_wisdom (); // load prior wisdom from disk
d_plan = fftwf_plan_dft_1d (fft_size,
reinterpret_cast<fftwf_complex *>(d_inbuf),