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/*
* 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-dif.c,v 1.1 2008/10/17 06:11:29 scuri Exp $ */
/* decimation in frequency 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_;
R *I0 = I;
{
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 is = ego->is, ivs = ego->ivs;
for (i = 0; i < vl; ++i, I += ivs) {
cld0->apply((plan *) cld0, I, I);
ego->k(I + is, I + (r * m - 1) * is, ego->W, ego->ios, m, is);
cldm->apply((plan *) cldm, I + is*(m/2), I + is*(m/2));
}
}
/* two-dimensional r x vl sub-transform: */
{
plan_rdft *cld = (plan_rdft *) ego->cld;
cld->apply((plan *) cld, I0, O);
}
}
static int applicable0(const solver_hc2hc *ego, const problem *p_,
const planner *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
&& (p->I == p->O || DESTROY_INPUTP(plnr))
&& (e->genus->okp(e, p->I + d[0].is,
p->I + (e->radix * m - 1) * d[0].is,
(int)m * d[0].is, 0, m, d[0].is))
&& (e->genus->okp(e, p->I + ivs + d[0].is,
p->I + ivs + (e->radix * m - 1) * d[0].is,
(int)m * d[0].is, 0, m, d[0].is))
);
}
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->is);
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_dif), finish, applicable, apply
};
return X(mkplan_rdft_hc2hc)((const solver_hc2hc *) ego, p, plnr, &adt);
}
solver *X(mksolver_rdft_hc2hc_dif)(khc2hc codelet, const hc2hc_desc *desc)
{
static const solver_adt sadt = { mkplan };
static const char name[] = "rdft-dif";
return X(mksolver_rdft_hc2hc)(codelet, desc, name, &sadt);
}
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