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Diffstat (limited to 'src/fftw3/dft/vrank-geq1.c')
| -rw-r--r-- | src/fftw3/dft/vrank-geq1.c | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/src/fftw3/dft/vrank-geq1.c b/src/fftw3/dft/vrank-geq1.c new file mode 100644 index 0000000..92a5776 --- /dev/null +++ b/src/fftw3/dft/vrank-geq1.c @@ -0,0 +1,215 @@ +/* + * 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: vrank-geq1.c,v 1.1 2008/10/17 06:11:08 scuri Exp $ */ + + +/* Plans for handling vector transform loops. These are *just* the + loops, and rely on child plans for the actual DFTs. + + They form a wrapper around solvers that don't have apply functions + for non-null vectors. + + vrank-geq1 plans also recursively handle the case of multi-dimensional + vectors, obviating the need for most solvers to deal with this. We + can also play games here, such as reordering the vector loops. + + Each vrank-geq1 plan reduces the vector rank by 1, picking out a + dimension determined by the vecloop_dim field of the solver. */ + +#include "dft.h" + +typedef struct { + solver super; + int vecloop_dim; + const int *buddies; + int nbuddies; +} S; + +typedef struct { + plan_dft super; + + plan *cld; + int vl; + int ivs, ovs; + const S *solver; +} P; + +static void apply(const plan *ego_, R *ri, R *ii, R *ro, R *io) +{ + const P *ego = (const P *) ego_; + int i, vl = ego->vl; + int ivs = ego->ivs, ovs = ego->ovs; + dftapply cldapply = ((plan_dft *) ego->cld)->apply; + + for (i = 0; i < vl; ++i) { + cldapply(ego->cld, + ri + i * ivs, ii + i * ivs, ro + i * ovs, io + i * ovs); + } +} + +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_; + const S *s = ego->solver; + p->print(p, "(dft-vrank>=1-x%d/%d%(%p%))", + ego->vl, s->vecloop_dim, ego->cld); +} + +static int pickdim(const S *ego, const tensor *vecsz, int oop, int *dp) +{ + return X(pickdim)(ego->vecloop_dim, ego->buddies, ego->nbuddies, + vecsz, oop, dp); +} + +static int applicable0(const solver *ego_, const problem *p_, int *dp) +{ + if (DFTP(p_)) { + const S *ego = (const S *) ego_; + const problem_dft *p = (const problem_dft *) p_; + + return (1 + && FINITE_RNK(p->vecsz->rnk) + && p->vecsz->rnk > 0 + && pickdim(ego, p->vecsz, p->ri != p->ro, dp) + ); + } + + return 0; +} + +static int applicable(const solver *ego_, const problem *p_, + const planner *plnr, int *dp) +{ + const S *ego = (const S *)ego_; + const problem_dft *p; + + if (!applicable0(ego_, p_, dp)) return 0; + + /* fftw2 behavior */ + if (NO_VRANK_SPLITSP(plnr) && (ego->vecloop_dim != ego->buddies[0])) + return 0; + + p = (const problem_dft *) p_; + + if (NO_UGLYP(plnr)) { + /* Heuristic: if the transform is multi-dimensional, and the + vector stride is less than the transform size, then we + probably want to use a rank>=2 plan first in order to combine + this vector with the transform-dimension vectors. */ + { + iodim *d = p->vecsz->dims + *dp; + if (1 + && p->sz->rnk > 1 + && X(imin)(X(iabs)(d->is), X(iabs)(d->os)) + < X(tensor_max_index)(p->sz) + ) + return 0; + } + + /* Heuristic: don't use a vrank-geq1 for rank-0 vrank-1 + transforms, since this case is better handled by rank-0 + solvers. */ + if (p->sz->rnk == 0 && p->vecsz->rnk == 1) return 0; + + if (NONTHREADED_ICKYP(plnr)) return 0; /* prefer threaded version */ + } + + return 1; +} + +static plan *mkplan(const solver *ego_, const problem *p_, planner *plnr) +{ + const S *ego = (const S *) ego_; + const problem_dft *p; + P *pln; + plan *cld; + int vdim; + iodim *d; + + static const plan_adt padt = { + X(dft_solve), awake, print, destroy + }; + + if (!applicable(ego_, p_, plnr, &vdim)) + return (plan *) 0; + p = (const problem_dft *) p_; + + d = p->vecsz->dims + vdim; + + A(d->n > 1); + cld = X(mkplan_d)(plnr, + X(mkproblem_dft_d)( + X(tensor_copy)(p->sz), + X(tensor_copy_except)(p->vecsz, vdim), + TAINT(p->ri, d->is), TAINT(p->ii, d->is), + TAINT(p->ro, d->os), TAINT(p->io, d->os))); + if (!cld) return (plan *) 0; + + pln = MKPLAN_DFT(P, &padt, apply); + + pln->cld = cld; + pln->vl = d->n; + pln->ivs = d->is; + pln->ovs = d->os; + + pln->solver = ego; + X(ops_zero)(&pln->super.super.ops); + pln->super.super.ops.other = 3.14159; /* magic to prefer codelet loops */ + X(ops_madd2)(pln->vl, &cld->ops, &pln->super.super.ops); + pln->super.super.pcost = pln->vl * cld->pcost; + + return &(pln->super.super); +} + +static solver *mksolver(int vecloop_dim, const int *buddies, int nbuddies) +{ + static const solver_adt sadt = { mkplan }; + S *slv = MKSOLVER(S, &sadt); + slv->vecloop_dim = vecloop_dim; + slv->buddies = buddies; + slv->nbuddies = nbuddies; + return &(slv->super); +} + +void X(dft_vrank_geq1_register)(planner *p) +{ + int i; + + /* FIXME: Should we try other vecloop_dim values? */ + static const int buddies[] = { 1, -1 }; + + const int nbuddies = sizeof(buddies) / sizeof(buddies[0]); + + for (i = 0; i < nbuddies; ++i) + REGISTER_SOLVER(p, mksolver(buddies[i], buddies, nbuddies)); +} |