Backward FFT for the non-periodic x and y case, undoing the transpose applied by fft_forward_110_omp. Only the unpadded extents are written, which is all undo_periodicity_xy_omp goes on to read.
On multiple ranks this is the exact reverse of fft_forward_110_omp, undoing the y fold (when p_row > 1) in the y-pencil of dc before redistributing back to the solver field's x-pencil.
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| class(omp_poisson_fft_t) | :: | self | ||||
| class(field_t), | intent(inout) | :: | f_out |