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90 lines
2.4 KiB
C
90 lines
2.4 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 vrank -infty RDFT2s (nothing to do), as well as in-place
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rank-0 HC2R. Note that in-place rank-0 R2HC is *not* a no-op, because
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we have to set the imaginary parts of the output to zero. */
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#include "rdft/rdft.h"
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static void apply(const plan *ego_, R *r0, R *r1, R *cr, R *ci)
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{
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UNUSED(ego_);
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UNUSED(r0);
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UNUSED(r1);
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UNUSED(cr);
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UNUSED(ci);
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}
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static int applicable(const solver *ego_, const problem *p_)
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{
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const problem_rdft2 *p = (const problem_rdft2 *) p_;
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UNUSED(ego_);
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return(0
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/* case 1 : -infty vector rank */
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|| (p->vecsz->rnk == RNK_MINFTY)
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/* case 2 : rank-0 in-place rdft, except that
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R2HC is not a no-op because it sets the imaginary
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part to 0 */
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|| (1
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&& p->kind != R2HC
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&& p->sz->rnk == 0
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&& FINITE_RNK(p->vecsz->rnk)
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&& (p->r0 == p->cr)
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&& X(rdft2_inplace_strides)(p, RNK_MINFTY)
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));
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}
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static void print(const plan *ego, printer *p)
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{
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UNUSED(ego);
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p->print(p, "(rdft2-nop)");
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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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static const plan_adt padt = {
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X(rdft2_solve), X(null_awake), print, X(plan_null_destroy)
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};
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plan_rdft2 *pln;
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UNUSED(plnr);
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if (!applicable(ego, p))
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return (plan *) 0;
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pln = MKPLAN_RDFT2(plan_rdft2, &padt, apply);
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X(ops_zero)(&pln->super.ops);
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return &(pln->super);
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}
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static solver *mksolver(void)
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{
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static const solver_adt sadt = { PROBLEM_RDFT2, mkplan, 0 };
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return MKSOLVER(solver, &sadt);
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}
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void X(rdft2_nop_register)(planner *p)
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{
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REGISTER_SOLVER(p, mksolver());
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}
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