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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: ct.c,v 1.1 2008/10/17 06:11:08 scuri Exp $ */
/* generic Cooley-Tukey routines */
#include "dft.h"
#include "ct.h"
static void destroy(plan *ego_)
{
plan_ct *ego = (plan_ct *) ego_;
X(plan_destroy_internal)(ego->cld);
X(stride_destroy)(ego->ios);
X(stride_destroy)(ego->vs);
}
static void awake(plan *ego_, int flg)
{
plan_ct *ego = (plan_ct *) ego_;
plan *cld = ego->cld;
AWAKE(cld, flg);
X(twiddle_awake)(flg, &ego->td, ego->slv->desc->tw,
ego->r * ego->m, ego->r, ego->m);
}
static void print(const plan *ego_, printer *p)
{
const plan_ct *ego = (const plan_ct *) ego_;
const solver_ct *slv = ego->slv;
const ct_desc *e = slv->desc;
p->print(p, "(%s-%d/%d%v \"%s\"%(%p%))",
slv->nam, ego->r, X(twiddle_length)(ego->r, e->tw),
ego->vl, e->nam, ego->cld);
}
#define divides(a, b) (((int)(b) % (int)(a)) == 0)
int X(dft_ct_applicable)(const solver_ct *ego, const problem *p_)
{
if (DFTP(p_)) {
const problem_dft *p = (const problem_dft *) p_;
const ct_desc *d = ego->desc;
return (1
&& p->sz->rnk == 1
&& p->vecsz->rnk <= 1
&& divides(d->radix, p->sz->dims[0].n)
);
}
return 0;
}
static const plan_adt padt =
{
X(dft_solve),
awake,
print,
destroy
};
plan *X(mkplan_dft_ct)(const solver_ct *ego,
const problem *p_,
planner *plnr,
const ctadt *adt)
{
plan_ct *pln;
plan *cld;
int n, r, m;
iodim *d;
const problem_dft *p;
const ct_desc *e = ego->desc;
if (!adt->applicable(ego, p_, plnr))
return (plan *) 0;
p = (const problem_dft *) p_;
d = p->sz->dims;
n = d[0].n;
r = e->radix;
m = n / r;
cld = X(mkplan_d)(plnr, adt->mkcld(ego, p));
if (!cld)
return (plan *) 0;
A(adt->pln_size >= sizeof(plan_ct));
pln = (plan_ct *) X(mkplan_dft)(adt->pln_size, &padt, adt->apply);
pln->slv = ego;
pln->cld = cld;
pln->k = ego->k;
pln->r = r;
pln->m = m;
pln->is = d[0].is;
pln->os = d[0].os;
pln->ios = pln->vs = 0;
X(tensor_tornk1)(p->vecsz, &pln->vl, &pln->ivs, &pln->ovs);
pln->td = 0;
adt->finish(pln);
return &(pln->super.super);
}
solver *X(mksolver_dft_ct)(union kct k, const ct_desc *desc,
const char *nam, const solver_adt *adt)
{
solver_ct *slv;
slv = MKSOLVER(solver_ct, adt);
slv->desc = desc;
slv->k = k;
slv->nam = nam;
return &(slv->super);
}
/* routines to create children are shared by many solvers */
problem *X(dft_mkcld_dit)(const solver_ct *ego, const problem_dft *p)
{
iodim *d = p->sz->dims;
const ct_desc *e = ego->desc;
int m = d[0].n / e->radix;
tensor *radix = X(mktensor_1d)(e->radix, d[0].is, m * d[0].os);
tensor *cld_vec = X(tensor_append)(radix, p->vecsz);
X(tensor_destroy)(radix);
return X(mkproblem_dft_d)(X(mktensor_1d)(m, e->radix * d[0].is, d[0].os),
cld_vec, p->ri, p->ii, p->ro, p->io);
}
problem *X(dft_mkcld_dif)(const solver_ct *ego, const problem_dft *p)
{
iodim *d = p->sz->dims;
const ct_desc *e = ego->desc;
int m = d[0].n / e->radix;
tensor *radix = X(mktensor_1d)(e->radix, m * d[0].is, d[0].os);
tensor *cld_vec = X(tensor_append)(radix, p->vecsz);
X(tensor_destroy)(radix);
return X(mkproblem_dft_d)(X(mktensor_1d)(m, d[0].is, e->radix * d[0].os),
cld_vec, p->ri, p->ii, p->ro, p->io);
}
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