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/rdft/hc2hc-dit.c | 126 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 126 insertions(+)
 create mode 100644 src/fftw3/rdft/hc2hc-dit.c

(limited to 'src/fftw3/rdft/hc2hc-dit.c')

diff --git a/src/fftw3/rdft/hc2hc-dit.c b/src/fftw3/rdft/hc2hc-dit.c
new file mode 100644
index 0000000..04aa776
--- /dev/null
+++ b/src/fftw3/rdft/hc2hc-dit.c
@@ -0,0 +1,126 @@
+/*
+ * 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: hc2hc-dit.c,v 1.1 2008/10/17 06:11:29 scuri Exp $ */
+
+/* decimation in time Cooley-Tukey */
+#include "rdft.h"
+#include "hc2hc.h"
+
+static void apply(const plan *ego_, R *I, R *O)
+{
+     const plan_hc2hc *ego = (const plan_hc2hc *) ego_;
+
+     /* two-dimensional r x vl sub-transform: */
+     {
+	  plan_rdft *cld = (plan_rdft *) ego->cld;
+	  cld->apply((plan *) cld, I, O);
+     }
+
+     {
+          plan_rdft *cld0 = (plan_rdft *) ego->cld0;
+          plan_rdft *cldm = (plan_rdft *) ego->cldm;
+          int i, r = ego->r, m = ego->m, vl = ego->vl;
+          int os = ego->os, ovs = ego->ovs;
+
+          for (i = 0; i < vl; ++i, O += ovs) {
+	       cld0->apply((plan *) cld0, O, O);
+               ego->k(O + os, O + (r * m - 1) * os, ego->W, ego->ios, m, os);
+	       cldm->apply((plan *) cldm, O + os*(m/2), O + os*(m/2));
+	  }
+     }
+}
+
+static int applicable0(const solver_hc2hc *ego, const problem *p_,
+		       const planner *plnr)
+{
+     UNUSED(plnr);
+     if (X(rdft_hc2hc_applicable)(ego, p_)) {
+	  int ivs, ovs;
+	  int vl;
+          const hc2hc_desc *e = ego->desc;
+          const problem_rdft *p = (const problem_rdft *) p_;
+          iodim *d = p->sz->dims;
+	  int m = d[0].n / e->radix;
+	  X(tensor_tornk1)(p->vecsz, &vl, &ivs, &ovs);
+          return (1
+		  && (e->genus->okp(e, p->O + d[0].os,
+				    p->O + (e->radix * m - 1) * d[0].os, 
+				    (int)m * d[0].os, 0, m, d[0].os))
+		  && (e->genus->okp(e, p->O + ovs + d[0].os,
+				    p->O + ovs + (e->radix * m - 1) * d[0].os, 
+				    (int)m * d[0].os, 0, m, d[0].os))
+	       );
+     }
+     return 0;
+}
+
+static int applicable(const solver_hc2hc *ego, const problem *p_,
+		      const planner *plnr)
+{
+     const problem_rdft *p;
+
+     if (!applicable0(ego, p_, plnr)) return 0;
+
+     p = (const problem_rdft *) p_;
+
+     /* emulate fftw2 behavior */
+     if (NO_VRECURSEP(plnr) && (p->vecsz->rnk > 0)) return 0;
+
+     if (NO_UGLYP(plnr)) {
+	  if (X(ct_uglyp)(16, p->sz->dims[0].n, ego->desc->radix)) return 0;
+	  if (NONTHREADED_ICKYP(plnr))
+	       return 0; /* prefer threaded version */
+     }
+
+     return 1;
+}
+
+static void finish(plan_hc2hc *ego)
+{
+     const hc2hc_desc *d = ego->slv->desc;
+     opcnt t;
+
+     ego->ios = X(mkstride)(ego->r, ego->m * ego->os);
+
+     X(ops_add)(&ego->cld0->ops, &ego->cldm->ops, &t);
+     X(ops_madd)(ego->vl, &t, &ego->cld->ops, &ego->super.super.ops);
+     X(ops_madd2)(ego->vl * ((ego->m - 1)/2) / d->genus->vl, &d->ops,
+		  &ego->super.super.ops);
+}
+
+
+static plan *mkplan(const solver *ego, const problem *p, planner *plnr)
+{
+     static const hc2hcadt adt = {
+	  sizeof(plan_hc2hc), 
+	  X(rdft_mkcldrn_dit), finish, applicable, apply
+     };
+     return X(mkplan_rdft_hc2hc)((const solver_hc2hc *) ego, p, plnr, &adt);
+}
+
+
+solver *X(mksolver_rdft_hc2hc_dit)(khc2hc codelet, const hc2hc_desc *desc)
+{
+     static const solver_adt sadt = { mkplan };
+     static const char name[] = "rdft-dit";
+
+     return X(mksolver_rdft_hc2hc)(codelet, desc, name, &sadt);
+}
-- 
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