mirror of
https://github.com/tildearrow/furnace.git
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144 lines
3.4 KiB
C
144 lines
3.4 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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/* Solve a DHT problem (Discrete Hartley Transform) via post-processing
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of an R2HC problem. */
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#include "rdft/rdft.h"
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typedef struct {
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solver super;
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} S;
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typedef struct {
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plan_rdft super;
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plan *cld;
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INT os;
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INT n;
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} P;
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static void apply(const plan *ego_, R *I, R *O)
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{
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const P *ego = (const P *) ego_;
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INT os = ego->os;
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INT i, n = ego->n;
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{
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plan_rdft *cld = (plan_rdft *) ego->cld;
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cld->apply((plan *) cld, I, O);
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}
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for (i = 1; i < n - i; ++i) {
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E a, b;
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a = O[os * i];
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b = O[os * (n - i)];
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#if FFT_SIGN == -1
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O[os * i] = a - b;
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O[os * (n - i)] = a + b;
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#else
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O[os * i] = a + b;
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O[os * (n - i)] = a - b;
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#endif
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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->cld, 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->cld);
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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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p->print(p, "(dht-r2hc-%D%(%p%))", ego->n, ego->cld);
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}
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static int applicable0(const problem *p_, const planner *plnr)
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{
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const problem_rdft *p = (const problem_rdft *) p_;
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return (1
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&& !NO_DHT_R2HCP(plnr)
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&& p->sz->rnk == 1
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&& p->vecsz->rnk == 0
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&& p->kind[0] == DHT
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);
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}
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static int applicable(const solver *ego, const problem *p, const planner *plnr)
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{
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UNUSED(ego);
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return (!NO_SLOWP(plnr) && applicable0(p, plnr));
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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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P *pln;
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const problem_rdft *p;
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plan *cld;
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static const plan_adt padt = {
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X(rdft_solve), awake, print, destroy
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};
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if (!applicable(ego_, p_, plnr))
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return (plan *)0;
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p = (const problem_rdft *) p_;
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/* NO_DHT_R2HC stops infinite loops with rdft-dht.c */
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cld = X(mkplan_f_d)(plnr,
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X(mkproblem_rdft_1)(p->sz, p->vecsz,
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p->I, p->O, R2HC),
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NO_DHT_R2HC, 0, 0);
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if (!cld) return (plan *)0;
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pln = MKPLAN_RDFT(P, &padt, apply);
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pln->n = p->sz->dims[0].n;
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pln->os = p->sz->dims[0].os;
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pln->cld = cld;
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pln->super.super.ops = cld->ops;
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pln->super.super.ops.other += 4 * ((pln->n - 1)/2);
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pln->super.super.ops.add += 2 * ((pln->n - 1)/2);
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return &(pln->super.super);
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}
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/* constructor */
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static solver *mksolver(void)
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{
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static const solver_adt sadt = { PROBLEM_RDFT, mkplan, 0 };
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S *slv = MKSOLVER(S, &sadt);
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return &(slv->super);
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}
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void X(dht_r2hc_register)(planner *p)
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{
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REGISTER_SOLVER(p, mksolver());
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}
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