diff options
Diffstat (limited to 'src/fftw3/rdft/hc2hc-dif.c')
| -rw-r--r-- | src/fftw3/rdft/hc2hc-dif.c | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/src/fftw3/rdft/hc2hc-dif.c b/src/fftw3/rdft/hc2hc-dif.c new file mode 100644 index 0000000..2bcdca2 --- /dev/null +++ b/src/fftw3/rdft/hc2hc-dif.c @@ -0,0 +1,124 @@ +/* + * 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); +} |