fftw_plan_dft_1d   26 test/fftw3.c     p0 = fftw_plan_dft_1d(n, b0, b1, FFTW_BACKWARD, FFTW_MEASURE);
fftw_plan_dft_1d   27 test/fftw3.c     p1 = fftw_plan_dft_1d(n, b1, b0, FFTW_FORWARD, FFTW_MEASURE);