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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: vrank2-transpose.c,v 1.1 2008/10/17 06:11:08 scuri Exp $ */
/* rank-0, vector-rank-2, square transposition */
#include "dft.h"
/* transposition routine. TODO: optimize? */
static void t(R *rA, R *iA, int n, int is, int js)
{
int i, j;
int im = iA - rA;
for (i = 1; i < n; ++i) {
R *p0 = rA + i * is;
R *p1 = rA + i * js;
for (j = 0; j < i; ++j) {
R ar = p0[0], ai = p0[im];
R br = p1[0], bi = p1[im];
p1[0] = ar; p1[im] = ai; p1 += is;
p0[0] = br; p0[im] = bi; p0 += js;
}
}
}
typedef solver S;
typedef struct {
plan_dft super;
int n;
int s0, s1;
int m;
int offset;
int nd, md, d; /* d = gcd(n,m), nd = n / d, md = m / d */
} P;
static void apply(const plan *ego_, R *ri, R *ii, R *ro, R *io)
{
const P *ego = (const P *) ego_;
UNUSED(ro);
UNUSED(io);
A(ego->n == ego->m);
t(ri, ii, ego->n, ego->s0, ego->s1);
}
static void apply_general(const plan *ego_, R *ri, R *ii, R *ro, R *io)
{
const P *ego = (const P *) ego_;
int nd = ego->nd, md = ego->md, d = ego->d;
R *buf = (R *)MALLOC((sizeof(R) * 2) * nd * md * d, BUFFERS);
UNUSED(ii); UNUSED(ro); UNUSED(io);
X(transpose)(ri + ego->offset, nd, md, d, 2, buf);
X(ifree)(buf);
}
static void apply_slow(const plan *ego_, R *ri, R *ii, R *ro, R *io)
{
const P *ego = (const P *) ego_;
int n = ego->n, m = ego->m;
R buf[4];
int move_size = (n + m) / 2;
char *move;
UNUSED(ii); UNUSED(ro); UNUSED(io);
STACK_MALLOC(char *, move, move_size);
X(transpose_slow)(ri + ego->offset, n, m, 2, move, move_size, buf);
STACK_FREE(move);
}
static int applicable(const problem *p_, const planner *plnr)
{
if (DFTP(p_)) {
const problem_dft *p = (const problem_dft *)p_;
const iodim *d = p->vecsz->dims;
return (1
&& p->ri == p->ro
&& p->sz->rnk == 0
&& p->vecsz->rnk == 2
&& X(transposable)(d, d+1, 1, X(imin)(d[0].is,d[0].os),
p->ri, p->ii)
&& (!NO_UGLYP(plnr) || d[0].n == d[1].n)
);
}
return 0;
}
static void print(const plan *ego_, printer *p)
{
const P *ego = (const P *) ego_;
p->print(p, "(dft-transpose-%dx%d)", ego->n, ego->m);
}
static plan *mkplan(const solver *ego, const problem *p_, planner *plnr)
{
const problem_dft *p;
P *pln;
const iodim *d;
static const plan_adt padt = {
X(dft_solve), X(null_awake), print, X(plan_null_destroy)
};
UNUSED(ego);
if (!applicable(p_, plnr))
return (plan *) 0;
p = (const problem_dft *) p_;
d = p->vecsz->dims;
pln = MKPLAN_DFT(P, &padt,
X(transpose_simplep)(d, d+1, 1, X(imin)(d[0].is,d[0].os),
p->ri, p->ii) ? apply :
(X(transpose_slowp)(d, d+1, 2) ? apply_slow :
apply_general));
X(transpose_dims)(d, d+1, &pln->n, &pln->m, &pln->d, &pln->nd, &pln->md);
pln->offset = (p->ri - p->ii == 1) ? -1 : 0;
pln->s0 = d[0].is;
pln->s1 = d[0].os;
/* (4 loads + 4 stores) * (pln->n \choose 2)
(FIXME? underestimate for non-square) */
X(ops_other)(4 * pln->n * (pln->m - 1), &pln->super.super.ops);
return &(pln->super.super);
}
static solver *mksolver(void)
{
static const solver_adt sadt = { mkplan };
return MKSOLVER(S, &sadt);
}
void X(dft_vrank2_transpose_register)(planner *p)
{
REGISTER_SOLVER(p, mksolver());
}
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