From 5a422aba704c375a307a902bafe658342e209906 Mon Sep 17 00:00:00 2001
From: scuri <scuri>
Date: Fri, 17 Oct 2008 06:10:15 +0000
Subject: First commit - moving from LuaForge to SourceForge

---
 src/fftw3/dft/ct-dif.c | 115 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 src/fftw3/dft/ct-dif.c

(limited to 'src/fftw3/dft/ct-dif.c')

diff --git a/src/fftw3/dft/ct-dif.c b/src/fftw3/dft/ct-dif.c
new file mode 100644
index 0000000..490dfc9
--- /dev/null
+++ b/src/fftw3/dft/ct-dif.c
@@ -0,0 +1,115 @@
+/*
+ * Copyright (c) 2003 Matteo Frigo
+ * Copyright (c) 2003 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+/* $Id: ct-dif.c,v 1.1 2008/10/17 06:11:08 scuri Exp $ */
+
+/* decimation in time Cooley-Tukey */
+#include "dft.h"
+#include "ct.h"
+
+static void apply(const plan *ego_, R *ri, R *ii, R *ro, R *io)
+{
+     const plan_ct *ego = (const plan_ct *) ego_;
+
+     {
+          int i, m = ego->m, vl = ego->vl;
+          int is = ego->is, ivs = ego->ivs;
+
+          for (i = 0; i < vl; ++i)
+               ego->k.dif(ri + i * ivs, ii + i * ivs, ego->td->W,
+			  ego->ios, m, is);
+     }
+
+     /* two-dimensional r x vl sub-transform: */
+     {
+	  plan *cld0 = ego->cld;
+	  plan_dft *cld = (plan_dft *) cld0;
+	  cld->apply(cld0, ri, ii, ro, io);
+     }
+}
+
+static int applicable0(const solver_ct *ego, const problem *p_,
+		       const planner *plnr)
+{
+     if (X(dft_ct_applicable)(ego, p_)) {
+	  int ivs, ovs;
+	  int vl;
+          const ct_desc *e = ego->desc;
+          const problem_dft *p = (const problem_dft *) p_;
+          iodim *d = p->sz->dims;
+	  int m = d[0].n / e->radix;
+	  X(tensor_tornk1)(p->vecsz, &vl, &ivs, &ovs);
+          return (1
+                  /* DIF destroys the input and we don't like it */
+                  && (p->ri == p->ro || DESTROY_INPUTP(plnr))
+
+		  && (e->genus->okp(e, p->ri, p->ii,
+				    (int)m * d[0].is, 0, m, d[0].is, plnr))
+		  && (e->genus->okp(e, p->ri + ivs, p->ii + ivs,
+				    (int)m * d[0].is, 0, m, d[0].is, plnr))
+	       );
+     }
+     return 0;
+}
+
+static int applicable(const solver_ct *ego, const problem *p_,
+		 const planner *plnr)
+{
+     const problem_dft *p;
+     
+     if (!applicable0(ego, p_, plnr))  return 0;
+
+     p = (const problem_dft *) p_;
+
+     /* emulate fftw2 behavior */
+     if (NO_VRECURSEP(plnr) && (p->vecsz->rnk > 0)) return 0;
+
+     if (NO_UGLYP(plnr) && X(ct_uglyp)(16, p->sz->dims[0].n, ego->desc->radix))
+	  return 0;
+
+     return 1;
+}
+
+static void finish(plan_ct *ego)
+{
+     const ct_desc *d = ego->slv->desc;
+     ego->ios = X(mkstride)(ego->r, ego->m * ego->is);
+     X(ops_madd)(ego->vl * ego->m / d->genus->vl, &d->ops, &ego->cld->ops,
+		 &ego->super.super.ops);
+}
+
+static plan *mkplan(const solver *ego, const problem *p, planner *plnr)
+{
+     static const ctadt adt = {
+	  sizeof(plan_ct), X(dft_mkcld_dif), finish, applicable, apply
+     };
+     return X(mkplan_dft_ct)((const solver_ct *) ego, p, plnr, &adt);
+}
+
+
+solver *X(mksolver_dft_ct_dif)(kdft_dif codelet, const ct_desc *desc)
+{
+     static const solver_adt sadt = { mkplan };
+     static const char name[] = "dft-dif";
+     union kct k;
+     k.dif = codelet;
+
+     return X(mksolver_dft_ct)(k, desc, name, &sadt);
+}
-- 
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