cannam@127: /*
cannam@127:  * Copyright (c) 2003, 2007-14 Matteo Frigo
cannam@127:  * Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
cannam@127:  *
cannam@127:  * This program is free software; you can redistribute it and/or modify
cannam@127:  * it under the terms of the GNU General Public License as published by
cannam@127:  * the Free Software Foundation; either version 2 of the License, or
cannam@127:  * (at your option) any later version.
cannam@127:  *
cannam@127:  * This program is distributed in the hope that it will be useful,
cannam@127:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
cannam@127:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
cannam@127:  * GNU General Public License for more details.
cannam@127:  *
cannam@127:  * You should have received a copy of the GNU General Public License
cannam@127:  * along with this program; if not, write to the Free Software
cannam@127:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
cannam@127:  *
cannam@127:  */
cannam@127: 
cannam@127: 
cannam@127: /* plans for vrank -infty DFTs (nothing to do) */
cannam@127: 
cannam@127: #include "dft.h"
cannam@127: 
cannam@127: static void apply(const plan *ego_, R *ri, R *ii, R *ro, R *io)
cannam@127: {
cannam@127:      UNUSED(ego_);
cannam@127:      UNUSED(ri);
cannam@127:      UNUSED(ii);
cannam@127:      UNUSED(ro);
cannam@127:      UNUSED(io);
cannam@127: }
cannam@127: 
cannam@127: static int applicable(const solver *ego_, const problem *p_)
cannam@127: {
cannam@127:      const problem_dft *p = (const problem_dft *) p_;
cannam@127: 
cannam@127:      UNUSED(ego_);
cannam@127: 
cannam@127:      return 0
cannam@127: 	  /* case 1 : -infty vector rank */
cannam@127: 	  || (!FINITE_RNK(p->vecsz->rnk))
cannam@127: 
cannam@127: 	  /* case 2 : rank-0 in-place dft */
cannam@127: 	  || (1
cannam@127: 	      && p->sz->rnk == 0
cannam@127: 	      && FINITE_RNK(p->vecsz->rnk)
cannam@127: 	      && p->ro == p->ri
cannam@127: 	      && X(tensor_inplace_strides)(p->vecsz)
cannam@127: 	       );
cannam@127: }
cannam@127: 
cannam@127: static void print(const plan *ego, printer *p)
cannam@127: {
cannam@127:      UNUSED(ego);
cannam@127:      p->print(p, "(dft-nop)");
cannam@127: }
cannam@127: 
cannam@127: static plan *mkplan(const solver *ego, const problem *p, planner *plnr)
cannam@127: {
cannam@127:      static const plan_adt padt = {
cannam@127: 	  X(dft_solve), X(null_awake), print, X(plan_null_destroy)
cannam@127:      };
cannam@127:      plan_dft *pln;
cannam@127: 
cannam@127:      UNUSED(plnr);
cannam@127: 
cannam@127:      if (!applicable(ego, p))
cannam@127:           return (plan *) 0;
cannam@127:      pln = MKPLAN_DFT(plan_dft, &padt, apply);
cannam@127:      X(ops_zero)(&pln->super.ops);
cannam@127: 
cannam@127:      return &(pln->super);
cannam@127: }
cannam@127: 
cannam@127: static solver *mksolver(void)
cannam@127: {
cannam@127:      static const solver_adt sadt = { PROBLEM_DFT, mkplan, 0 };
cannam@127:      return MKSOLVER(solver, &sadt);
cannam@127: }
cannam@127: 
cannam@127: void X(dft_nop_register)(planner *p)
cannam@127: {
cannam@127:      REGISTER_SOLVER(p, mksolver());
cannam@127: }