comparison src/fftw-3.3.5/rdft/hc2hc.c @ 42:2cd0e3b3e1fd

Current fftw source

+/*
+ * Copyright (c) 2003, 2007-14 Matteo Frigo
+ * Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#include "hc2hc.h"
+
+hc2hc_solver *(*X(mksolver_hc2hc_hook))(size_t, INT, hc2hc_mkinferior) = 0;
+
+typedef struct {
+     plan_rdft super;
+     plan *cld;
+     plan *cldw;
+     INT r;
+} P;
+
+static void apply_dit(const plan *ego_, R *I, R *O)
+{
+     const P *ego = (const P *) ego_;
+     plan_rdft *cld;
+     plan_hc2hc *cldw;
+
+     cld = (plan_rdft *) ego->cld;
+     cld->apply(ego->cld, I, O);
+
+     cldw = (plan_hc2hc *) ego->cldw;
+     cldw->apply(ego->cldw, O);
+}
+
+static void apply_dif(const plan *ego_, R *I, R *O)
+{
+     const P *ego = (const P *) ego_;
+     plan_rdft *cld;
+     plan_hc2hc *cldw;
+
+     cldw = (plan_hc2hc *) ego->cldw;
+     cldw->apply(ego->cldw, I);
+
+     cld = (plan_rdft *) ego->cld;
+     cld->apply(ego->cld, I, O);
+}
+
+static void awake(plan *ego_, enum wakefulness wakefulness)
+{
+     P *ego = (P *) ego_;
+     X(plan_awake)(ego->cld, wakefulness);
+     X(plan_awake)(ego->cldw, wakefulness);
+}
+
+static void destroy(plan *ego_)
+{
+     P *ego = (P *) ego_;
+     X(plan_destroy_internal)(ego->cldw);
+     X(plan_destroy_internal)(ego->cld);
+}
+
+static void print(const plan *ego_, printer *p)
+{
+     const P *ego = (const P *) ego_;
+     p->print(p, "(rdft-ct-%s/%D%(%p%)%(%p%))",
+	      ego->super.apply == apply_dit ? "dit" : "dif",
+	      ego->r, ego->cldw, ego->cld);
+}
+
+static int applicable0(const hc2hc_solver *ego, const problem *p_, planner *plnr)
+{
+     const problem_rdft *p = (const problem_rdft *) p_;
+     INT r;
+
+     return (1
+	     && p->sz->rnk == 1
+	     && p->vecsz->rnk <= 1 
+
+	     && (/* either the problem is R2HC, which is solved by DIT */
+		  (p->kind[0] == R2HC)
+		  ||
+		  /* or the problem is HC2R, in which case it is solved
+		     by DIF, which destroys the input */
+		  (p->kind[0] == HC2R && 
+		   (p->I == p->O || !NO_DESTROY_INPUTP(plnr))))
+		  
+	     && ((r = X(choose_radix)(ego->r, p->sz->dims[0].n)) > 0)
+	     && p->sz->dims[0].n > r);
+}
+
+int X(hc2hc_applicable)(const hc2hc_solver *ego, const problem *p_, planner *plnr)
+{
+     const problem_rdft *p;
+
+     if (!applicable0(ego, p_, plnr))
+          return 0;
+
+     p = (const problem_rdft *) p_;
+
+     return (0
+	     || p->vecsz->rnk == 0
+	     || !NO_VRECURSEP(plnr)
+	  );
+}
+
+static plan *mkplan(const solver *ego_, const problem *p_, planner *plnr)
+{
+     const hc2hc_solver *ego = (const hc2hc_solver *) ego_;
+     const problem_rdft *p;
+     P *pln = 0;
+     plan *cld = 0, *cldw = 0;
+     INT n, r, m, v, ivs, ovs;
+     iodim *d;
+
+     static const plan_adt padt = {
+	  X(rdft_solve), awake, print, destroy
+     };
+
+     if (NO_NONTHREADEDP(plnr) || !X(hc2hc_applicable)(ego, p_, plnr))
+          return (plan *) 0;
+
+     p = (const problem_rdft *) p_;
+     d = p->sz->dims;
+     n = d[0].n;
+     r = X(choose_radix)(ego->r, n);
+     m = n / r;
+
+     X(tensor_tornk1)(p->vecsz, &v, &ivs, &ovs);
+
+     switch (p->kind[0]) {
+	 case R2HC:
+	      cldw = ego->mkcldw(ego, 
+				 R2HC, r, m, d[0].os, v, ovs, 0, (m+2)/2, 
+				 p->O, plnr);
+	      if (!cldw) goto nada;
+
+	      cld = X(mkplan_d)(plnr, 
+				X(mkproblem_rdft_d)(
+				     X(mktensor_1d)(m, r * d[0].is, d[0].os),
+				     X(mktensor_2d)(r, d[0].is, m * d[0].os,
+						    v, ivs, ovs),
+				     p->I, p->O, p->kind)
+		   );
+	      if (!cld) goto nada;
+
+	      pln = MKPLAN_RDFT(P, &padt, apply_dit);
+	      break;
+
+	 case HC2R:
+	      cldw = ego->mkcldw(ego,
+				 HC2R, r, m, d[0].is, v, ivs, 0, (m+2)/2, 
+				 p->I, plnr);
+	      if (!cldw) goto nada;
+
+	      cld = X(mkplan_d)(plnr, 
+				X(mkproblem_rdft_d)(
+				     X(mktensor_1d)(m, d[0].is, r * d[0].os),
+				     X(mktensor_2d)(r, m * d[0].is, d[0].os,
+						    v, ivs, ovs),
+				     p->I, p->O, p->kind)
+		   );
+	      if (!cld) goto nada;
+	      
+	      pln = MKPLAN_RDFT(P, &padt, apply_dif);
+	      break;
+
+	 default: 
+	      A(0);
+     }
+
+     pln->cld = cld;
+     pln->cldw = cldw;
+     pln->r = r;
+     X(ops_add)(&cld->ops, &cldw->ops, &pln->super.super.ops);
+
+     /* inherit could_prune_now_p attribute from cldw */
+     pln->super.super.could_prune_now_p = cldw->could_prune_now_p;
+
+     return &(pln->super.super);
+
+ nada:
+     X(plan_destroy_internal)(cldw);
+     X(plan_destroy_internal)(cld);
+     return (plan *) 0;
+}
+
+hc2hc_solver *X(mksolver_hc2hc)(size_t size, INT r, hc2hc_mkinferior mkcldw)
+{
+     static const solver_adt sadt = { PROBLEM_RDFT, mkplan, 0 };
+     hc2hc_solver *slv = (hc2hc_solver *)X(mksolver)(size, &sadt);
+     slv->r = r;
+     slv->mkcldw = mkcldw;
+     return slv;
+}
+
+plan *X(mkplan_hc2hc)(size_t size, const plan_adt *adt, hc2hcapply apply)
+{
+     plan_hc2hc *ego;
+
+     ego = (plan_hc2hc *) X(mkplan)(size, adt);
+     ego->apply = apply;
+
+     return &(ego->super);
+}