mirror of
https://github.com/tildearrow/furnace.git
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238 lines
6.4 KiB
C
238 lines
6.4 KiB
C
/*
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* Copyright (c) 2003, 2007-14 Matteo Frigo
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* Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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/* plans for RDFT2 of rank >= 2 (multidimensional) */
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#include "rdft/rdft.h"
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#include "dft/dft.h"
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typedef struct {
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solver super;
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int spltrnk;
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const int *buddies;
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size_t nbuddies;
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} S;
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typedef struct {
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plan_dft super;
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plan *cldr, *cldc;
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const S *solver;
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} P;
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static void apply_r2hc(const plan *ego_, R *r0, R *r1, R *cr, R *ci)
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{
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const P *ego = (const P *) ego_;
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{
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plan_rdft2 *cldr = (plan_rdft2 *) ego->cldr;
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cldr->apply((plan *) cldr, r0, r1, cr, ci);
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}
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{
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plan_dft *cldc = (plan_dft *) ego->cldc;
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cldc->apply((plan *) cldc, cr, ci, cr, ci);
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}
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}
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static void apply_hc2r(const plan *ego_, R *r0, R *r1, R *cr, R *ci)
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{
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const P *ego = (const P *) ego_;
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{
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plan_dft *cldc = (plan_dft *) ego->cldc;
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cldc->apply((plan *) cldc, ci, cr, ci, cr);
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}
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{
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plan_rdft2 *cldr = (plan_rdft2 *) ego->cldr;
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cldr->apply((plan *) cldr, r0, r1, cr, ci);
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}
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}
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static void awake(plan *ego_, enum wakefulness wakefulness)
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{
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P *ego = (P *) ego_;
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X(plan_awake)(ego->cldr, wakefulness);
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X(plan_awake)(ego->cldc, wakefulness);
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}
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static void destroy(plan *ego_)
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{
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P *ego = (P *) ego_;
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X(plan_destroy_internal)(ego->cldr);
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X(plan_destroy_internal)(ego->cldc);
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}
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static void print(const plan *ego_, printer *p)
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{
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const P *ego = (const P *) ego_;
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const S *s = ego->solver;
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p->print(p, "(rdft2-rank>=2/%d%(%p%)%(%p%))",
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s->spltrnk, ego->cldr, ego->cldc);
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}
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static int picksplit(const S *ego, const tensor *sz, int *rp)
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{
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A(sz->rnk > 1); /* cannot split rnk <= 1 */
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if (!X(pickdim)(ego->spltrnk, ego->buddies, ego->nbuddies, sz, 1, rp))
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return 0;
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*rp += 1; /* convert from dim. index to rank */
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if (*rp >= sz->rnk) /* split must reduce rank */
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return 0;
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return 1;
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}
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static int applicable0(const solver *ego_, const problem *p_, int *rp,
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const planner *plnr)
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{
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const problem_rdft2 *p = (const problem_rdft2 *) p_;
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const S *ego = (const S *)ego_;
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return (1
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&& FINITE_RNK(p->sz->rnk) && FINITE_RNK(p->vecsz->rnk)
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/* FIXME: multidimensional R2HCII ? */
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&& (p->kind == R2HC || p->kind == HC2R)
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&& p->sz->rnk >= 2
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&& picksplit(ego, p->sz, rp)
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&& (0
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/* can work out-of-place, but HC2R destroys input */
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|| (p->r0 != p->cr &&
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(p->kind == R2HC || !NO_DESTROY_INPUTP(plnr)))
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/* FIXME: what are sufficient conditions for inplace? */
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|| (p->r0 == p->cr))
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);
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}
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/* TODO: revise this. */
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static int applicable(const solver *ego_, const problem *p_,
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const planner *plnr, int *rp)
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{
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const S *ego = (const S *)ego_;
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if (!applicable0(ego_, p_, rp, plnr)) return 0;
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if (NO_RANK_SPLITSP(plnr) && (ego->spltrnk != ego->buddies[0]))
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return 0;
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if (NO_UGLYP(plnr)) {
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const problem_rdft2 *p = (const problem_rdft2 *) p_;
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/* Heuristic: if the vector stride is greater than the transform
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size, don't use (prefer to do the vector loop first with a
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vrank-geq1 plan). */
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if (p->vecsz->rnk > 0 &&
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X(tensor_min_stride)(p->vecsz)
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> X(rdft2_tensor_max_index)(p->sz, p->kind))
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return 0;
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}
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return 1;
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}
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static plan *mkplan(const solver *ego_, const problem *p_, planner *plnr)
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{
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const S *ego = (const S *) ego_;
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const problem_rdft2 *p;
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P *pln;
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plan *cldr = 0, *cldc = 0;
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tensor *sz1, *sz2, *vecszi, *sz2i;
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int spltrnk;
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inplace_kind k;
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problem *cldp;
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static const plan_adt padt = {
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X(rdft2_solve), awake, print, destroy
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};
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if (!applicable(ego_, p_, plnr, &spltrnk))
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return (plan *) 0;
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p = (const problem_rdft2 *) p_;
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X(tensor_split)(p->sz, &sz1, spltrnk, &sz2);
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k = p->kind == R2HC ? INPLACE_OS : INPLACE_IS;
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vecszi = X(tensor_copy_inplace)(p->vecsz, k);
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sz2i = X(tensor_copy_inplace)(sz2, k);
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/* complex data is ~half of real */
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sz2i->dims[sz2i->rnk - 1].n = sz2i->dims[sz2i->rnk - 1].n/2 + 1;
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cldr = X(mkplan_d)(plnr,
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X(mkproblem_rdft2_d)(X(tensor_copy)(sz2),
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X(tensor_append)(p->vecsz, sz1),
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p->r0, p->r1,
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p->cr, p->ci, p->kind));
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if (!cldr) goto nada;
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if (p->kind == R2HC)
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cldp = X(mkproblem_dft_d)(X(tensor_copy_inplace)(sz1, k),
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X(tensor_append)(vecszi, sz2i),
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p->cr, p->ci, p->cr, p->ci);
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else /* HC2R must swap re/im parts to get IDFT */
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cldp = X(mkproblem_dft_d)(X(tensor_copy_inplace)(sz1, k),
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X(tensor_append)(vecszi, sz2i),
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p->ci, p->cr, p->ci, p->cr);
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cldc = X(mkplan_d)(plnr, cldp);
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if (!cldc) goto nada;
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pln = MKPLAN_RDFT2(P, &padt, p->kind == R2HC ? apply_r2hc : apply_hc2r);
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pln->cldr = cldr;
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pln->cldc = cldc;
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pln->solver = ego;
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X(ops_add)(&cldr->ops, &cldc->ops, &pln->super.super.ops);
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X(tensor_destroy4)(sz2i, vecszi, sz2, sz1);
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return &(pln->super.super);
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nada:
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X(plan_destroy_internal)(cldr);
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X(plan_destroy_internal)(cldc);
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X(tensor_destroy4)(sz2i, vecszi, sz2, sz1);
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return (plan *) 0;
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}
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static solver *mksolver(int spltrnk, const int *buddies, size_t nbuddies)
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{
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static const solver_adt sadt = { PROBLEM_RDFT2, mkplan, 0 };
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S *slv = MKSOLVER(S, &sadt);
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slv->spltrnk = spltrnk;
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slv->buddies = buddies;
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slv->nbuddies = nbuddies;
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return &(slv->super);
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}
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void X(rdft2_rank_geq2_register)(planner *p)
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{
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static const int buddies[] = { 1, 0, -2 };
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size_t i;
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for (i = 0; i < NELEM(buddies); ++i)
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REGISTER_SOLVER(p, mksolver(buddies[i], buddies, NELEM(buddies)));
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/* FIXME: Should we try more buddies? See also dft/rank-geq2. */
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}
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