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authorscuri <scuri>2009-08-20 12:35:06 +0000
committerscuri <scuri>2009-08-20 12:35:06 +0000
commit5d735255ddd3cb2f547abd3d03969af3fb7eb04e (patch)
tree8fb66510bc625bb1b08ccb41f1b83fb0f7cb8f19 /src/fftw3/rdft/dft-r2hc.c
parent35733b87eed86e5228f12fa10c98a3d9d22a6073 (diff)
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Diffstat (limited to 'src/fftw3/rdft/dft-r2hc.c')
-rw-r--r--src/fftw3/rdft/dft-r2hc.c187
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diff --git a/src/fftw3/rdft/dft-r2hc.c b/src/fftw3/rdft/dft-r2hc.c
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--- a/src/fftw3/rdft/dft-r2hc.c
+++ /dev/null
@@ -1,187 +0,0 @@
-/*
- * 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: dft-r2hc.c,v 1.1 2008/10/17 06:11:29 scuri Exp $ */
-
-/* Compute the complex DFT by combining R2HC RDFTs on the real
- and imaginary parts. This could be useful for people just wanting
- to link to the real codelets and not the complex ones. It could
- also even be faster than the complex algorithms for split (as opposed
- to interleaved) real/imag complex data. */
-
-#include "rdft.h"
-#include "dft.h"
-
-typedef struct {
- solver super;
-} S;
-
-typedef struct {
- plan_dft super;
- plan *cld;
- int os;
- int n;
-} P;
-
-static void apply(const plan *ego_, R *ri, R *ii, R *ro, R *io)
-{
- const P *ego = (const P *) ego_;
- int os;
- int i, n;
-
- UNUSED(ii);
-
- { /* transform vector of real & imag parts: */
- plan_rdft *cld = (plan_rdft *) ego->cld;
- cld->apply((plan *) cld, ri, ro);
- }
-
- os = ego->os;
- n = ego->n;
- for (i = 1; i < (n + 1)/2; ++i) {
- R rop, iop, iom, rom;
- rop = ro[os * i];
- iop = io[os * i];
- rom = ro[os * (n - i)];
- iom = io[os * (n - i)];
- ro[os * i] = rop - iom;
- io[os * i] = iop + rom;
- ro[os * (n - i)] = rop + iom;
- io[os * (n - i)] = iop - rom;
- }
-}
-
-static void awake(plan *ego_, int flg)
-{
- P *ego = (P *) ego_;
- AWAKE(ego->cld, flg);
-}
-
-static void destroy(plan *ego_)
-{
- P *ego = (P *) ego_;
- X(plan_destroy_internal)(ego->cld);
-}
-
-static void print(const plan *ego_, printer *p)
-{
- const P *ego = (const P *) ego_;
- p->print(p, "(dft-r2hc-%d%(%p%))", ego->n, ego->cld);
-}
-
-#define ALLOW_RANK0 0 /* disable for now, subject to testing */
-
-static int applicable0(const problem *p_)
-{
- if (DFTP(p_)) {
- const problem_dft *p = (const problem_dft *) p_;
- return ((p->sz->rnk == 1 && p->vecsz->rnk == 0)
-#if ALLOW_RANK0
- || p->sz->rnk == 0
-#endif
- );
- }
-
- return 0;
-}
-
-static int split(R *r, R *i, int n, int s)
-{
- return ((r > i ? r - i : i - r) >= ((int)n) * (s > 0 ? s : -s));
-}
-
-static int applicable(const problem *p_, const planner *plnr)
-{
- if (!applicable0(p_)) return 0;
-
- {
- const problem_dft *p = (const problem_dft *) p_;
- if (NO_UGLYP(plnr) && DFT_R2HC_ICKYP(plnr)) return 0;
-
- if (p->sz->rnk == 1 &&
- split(p->ri, p->ii, p->sz->dims[0].n, p->sz->dims[0].is) &&
- split(p->ro, p->io, p->sz->dims[0].n, p->sz->dims[0].os))
- return 1;
-
- return !(NO_UGLYP(plnr));
- }
-}
-
-static plan *mkplan(const solver *ego_, const problem *p_, planner *plnr)
-{
- P *pln;
- const problem_dft *p;
- plan *cld;
-
- static const plan_adt padt = {
- X(dft_solve), awake, print, destroy
- };
-
- UNUSED(ego_);
- if (!applicable(p_, plnr))
- return (plan *)0;
-
- p = (const problem_dft *) p_;
-
- {
- tensor *ri_vec = X(mktensor_1d)(2, p->ii - p->ri, p->io - p->ro);
- tensor *cld_vec = X(tensor_append)(ri_vec, p->vecsz);
- cld = X(mkplan_d)(plnr,
- X(mkproblem_rdft_1)(p->sz, cld_vec,
- p->ri, p->ro, R2HC));
- X(tensor_destroy2)(ri_vec, cld_vec);
- }
- if (!cld) return (plan *)0;
-
- pln = MKPLAN_DFT(P, &padt, apply);
-
-#if ALLOW_RANK0
- if (p->sz->rnk == 0) {
- pln->n = 1;
- pln->os = 0;
- }
- else
-#endif
- {
- pln->n = p->sz->dims[0].n;
- pln->os = p->sz->dims[0].os;
- }
-
- pln->cld = cld;
-
- pln->super.super.ops = cld->ops;
- pln->super.super.ops.other += 8 * ((pln->n - 1)/2);
- pln->super.super.ops.add += 4 * ((pln->n - 1)/2);
-
- return &(pln->super.super);
-}
-
-/* constructor */
-static solver *mksolver(void)
-{
- static const solver_adt sadt = { mkplan };
- S *slv = MKSOLVER(S, &sadt);
- return &(slv->super);
-}
-
-void X(dft_r2hc_register)(planner *p)
-{
- REGISTER_SOLVER(p, mksolver());
-}