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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: rank0-rdft2.c,v 1.1 2008/10/17 06:11:29 scuri Exp $ */
/* plans for rank-0 RDFT2 (copy operations, plus setting 0 imag. parts) */
#include "rdft.h"
#ifdef HAVE_STRING_H
#include <string.h> /* for memcpy() */
#endif
typedef struct {
solver super;
} S;
typedef struct {
plan_rdft super;
int vl;
int ivs, ovs;
plan *cldcpy;
} P;
static int applicable(const problem *p_)
{
if (RDFT2P(p_)) {
const problem_rdft2 *p = (const problem_rdft2 *) p_;
return (1
&& p->sz->rnk == 0
&& (p->kind == HC2R
|| (((p->r != p->rio && p->r != p->iio)
|| X(rdft2_inplace_strides)(p, RNK_MINFTY))
&& p->vecsz->rnk <= 1))
);
}
return 0;
}
static void apply_r2hc(const plan *ego_, R *r, R *rio, R *iio)
{
const P *ego = (const P *) ego_;
int i, vl = ego->vl;
int ivs = ego->ivs, ovs = ego->ovs;
for (i = 4; i <= vl; i += 4) {
R r0, r1, r2, r3;
r0 = *r; r += ivs;
r1 = *r; r += ivs;
r2 = *r; r += ivs;
r3 = *r; r += ivs;
*rio = r0; rio += ovs;
*iio = 0.0; iio += ovs;
*rio = r1; rio += ovs;
*iio = 0.0; iio += ovs;
*rio = r2; rio += ovs;
*iio = 0.0; iio += ovs;
*rio = r3; rio += ovs;
*iio = 0.0; iio += ovs;
}
for (; i < vl + 4; ++i) {
R r0;
r0 = *r; r += ivs;
*rio = r0; rio += ovs;
*iio = 0.0; iio += ovs;
}
}
/* in-place r2hc rank-0: set imaginary parts of output to 0 */
static void apply_r2hc_inplace(const plan *ego_, R *r, R *rio, R *iio)
{
const P *ego = (const P *) ego_;
int i, vl = ego->vl;
int ovs = ego->ovs;
UNUSED(r);
UNUSED(rio);
for (i = 4; i <= vl; i += 4) {
*iio = 0.0; iio += ovs;
*iio = 0.0; iio += ovs;
*iio = 0.0; iio += ovs;
*iio = 0.0; iio += ovs;
}
for (; i < vl + 4; ++i) {
*iio = 0.0; iio += ovs;
}
}
/* a rank-0 HC2R rdft2 problem is just a copy from rio to r,
so we can use a rank-0 rdft plan */
static void apply_hc2r(const plan *ego_, R *r, R *rio, R *iio)
{
const P *ego = (const P *) ego_;
plan_rdft *cldcpy = (plan_rdft *) ego->cldcpy;
UNUSED(iio);
cldcpy->apply((plan *) cldcpy, rio, r);
}
static void awake(plan *ego_, int flg)
{
P *ego = (P *) ego_;
if (ego->cldcpy)
AWAKE(ego->cldcpy, flg);
}
static void destroy(plan *ego_)
{
P *ego = (P *) ego_;
if (ego->cldcpy)
X(plan_destroy_internal)(ego->cldcpy);
}
static void print(const plan *ego_, printer *p)
{
const P *ego = (const P *) ego_;
if (ego->cldcpy)
p->print(p, "(rdft2-hc2r-rank0%(%p%))", ego->cldcpy);
else
p->print(p, "(rdft2-r2hc-rank0%v)", ego->vl);
}
static plan *mkplan(const solver *ego_, const problem *p_, planner *plnr)
{
const problem_rdft2 *p;
plan *cldcpy = (plan *) 0;
P *pln;
static const plan_adt padt = {
X(rdft2_solve), awake, print, destroy
};
UNUSED(ego_);
if (!applicable(p_))
return (plan *) 0;
p = (const problem_rdft2 *) p_;
if (p->kind == HC2R) {
cldcpy = X(mkplan_d)(plnr,
X(mkproblem_rdft_d)(
X(mktensor_0d)(),
X(tensor_copy)(p->vecsz),
p->rio, p->r, (rdft_kind *) 0));
if (!cldcpy) return (plan *) 0;
}
pln = MKPLAN_RDFT2(P, &padt,
p->kind == R2HC ?
(p->r == p->rio ? apply_r2hc_inplace : apply_r2hc)
: apply_hc2r);
if (p->kind == R2HC)
X(tensor_tornk1)(p->vecsz, &pln->vl, &pln->ivs, &pln->ovs);
pln->cldcpy = cldcpy;
if (p->kind == R2HC) {
/* vl loads, 2*vl stores */
X(ops_other)(3 * pln->vl, &pln->super.super.ops);
}
else {
pln->super.super.ops = cldcpy->ops;
}
return &(pln->super.super);
}
static solver *mksolver(void)
{
static const solver_adt sadt = { mkplan };
S *slv = MKSOLVER(S, &sadt);
return &(slv->super);
}
void X(rdft2_rank0_register)(planner *p)
{
REGISTER_SOLVER(p, mksolver());
}
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