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/direct.c | 152 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 152 insertions(+)
 create mode 100644 src/fftw3/dft/direct.c

(limited to 'src/fftw3/dft/direct.c')

diff --git a/src/fftw3/dft/direct.c b/src/fftw3/dft/direct.c
new file mode 100644
index 0000000..cb11c88
--- /dev/null
+++ b/src/fftw3/dft/direct.c
@@ -0,0 +1,152 @@
+/*
+ * 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: direct.c,v 1.1 2008/10/17 06:11:08 scuri Exp $ */
+
+/* direct DFT solver, if we have a codelet */
+
+#include "dft.h"
+
+typedef struct {
+     solver super;
+     const kdft_desc *desc;
+     kdft k;
+} S;
+
+typedef struct {
+     plan_dft super;
+
+     stride is, os;
+     int vl;
+     int ivs, ovs;
+     kdft k;
+     const S *slv;
+} P;
+
+static void apply(const plan *ego_, R *ri, R *ii, R *ro, R *io)
+{
+     const P *ego = (const P *) ego_;
+     ASSERT_ALIGNED_DOUBLE;
+     ego->k(ri, ii, ro, io, ego->is, ego->os, ego->vl, ego->ivs, ego->ovs);
+}
+
+static void destroy(plan *ego_)
+{
+     P *ego = (P *) ego_;
+     X(stride_destroy)(ego->is);
+     X(stride_destroy)(ego->os);
+}
+
+static void print(const plan *ego_, printer *p)
+{
+     const P *ego = (const P *) ego_;
+     const S *s = ego->slv;
+     const kdft_desc *d = s->desc;
+
+     p->print(p, "(dft-direct-%d%v \"%s\")", d->sz, ego->vl, d->nam);
+}
+
+static int applicable(const solver *ego_, const problem *p_,
+		      const planner *plnr)
+{
+     if (DFTP(p_)) {
+          const S *ego = (const S *) ego_;
+          const problem_dft *p = (const problem_dft *) p_;
+          const kdft_desc *d = ego->desc;
+	  int vl;
+	  int ivs, ovs;
+
+          return (
+	       1
+	       && p->sz->rnk == 1
+	       && p->vecsz->rnk <= 1
+	       && p->sz->dims[0].n == d->sz
+
+	       /* check strides etc */
+	       && X(tensor_tornk1)(p->vecsz, &vl, &ivs, &ovs)
+
+	       && (d->genus->okp(d, p->ri, p->ii, p->ro, p->io,
+				 p->sz->dims[0].is, p->sz->dims[0].os,
+				 vl, ivs, ovs, plnr))
+
+	       && (0
+		   /* can operate out-of-place */
+		   || p->ri != p->ro
+
+		   /*
+		    * can compute one transform in-place, no matter
+		    * what the strides are.
+		    */
+		   || p->vecsz->rnk == 0
+
+		   /* can operate in-place as long as strides are the same */
+		   || (X(tensor_inplace_strides2)(p->sz, p->vecsz))
+		    )
+	       );
+     }
+
+     return 0;
+}
+
+static plan *mkplan(const solver *ego_, const problem *p_, planner *plnr)
+{
+     const S *ego = (const S *) ego_;
+     P *pln;
+     const problem_dft *p;
+     iodim *d;
+     const kdft_desc *e = ego->desc;
+
+     static const plan_adt padt = {
+	  X(dft_solve), X(null_awake), print, destroy
+     };
+
+     UNUSED(plnr);
+
+     if (!applicable(ego_, p_, plnr))
+          return (plan *)0;
+
+     p = (const problem_dft *) p_;
+
+     pln = MKPLAN_DFT(P, &padt, apply);
+
+     d = p->sz->dims;
+
+     pln->k = ego->k;
+     pln->is = X(mkstride)(e->sz, d[0].is);
+     pln->os = X(mkstride)(e->sz, d[0].os);
+
+     X(tensor_tornk1)(p->vecsz, &pln->vl, &pln->ivs, &pln->ovs);
+     pln->slv = ego;
+
+     X(ops_zero)(&pln->super.super.ops);
+     X(ops_madd2)(pln->vl / e->genus->vl, &e->ops, &pln->super.super.ops);
+
+     return &(pln->super.super);
+}
+
+/* constructor */
+solver *X(mksolver_dft_direct)(kdft k, const kdft_desc *desc)
+{
+     static const solver_adt sadt = { mkplan };
+     S *slv = MKSOLVER(S, &sadt);
+     slv->k = k;
+     slv->desc = desc;
+     return &(slv->super);
+}
-- 
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