65 lines
2.3 KiB
C
65 lines
2.3 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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#include "rdft/rdft.h"
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/* Check if the vecsz/sz strides are consistent with the problem
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being in-place for vecsz.dim[vdim], or for all dimensions
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if vdim == RNK_MINFTY. We can't just use tensor_inplace_strides
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because rdft transforms have the unfortunate property of
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differing input and output sizes. This routine is not
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exhaustive; we only return 1 for the most common case. */
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int X(rdft2_inplace_strides)(const problem_rdft2 *p, int vdim)
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{
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INT N, Nc;
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INT rs, cs;
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int i;
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for (i = 0; i + 1 < p->sz->rnk; ++i)
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if (p->sz->dims[i].is != p->sz->dims[i].os)
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return 0;
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if (!FINITE_RNK(p->vecsz->rnk) || p->vecsz->rnk == 0)
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return 1;
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if (!FINITE_RNK(vdim)) { /* check all vector dimensions */
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for (vdim = 0; vdim < p->vecsz->rnk; ++vdim)
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if (!X(rdft2_inplace_strides)(p, vdim))
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return 0;
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return 1;
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}
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A(vdim < p->vecsz->rnk);
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if (p->sz->rnk == 0)
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return(p->vecsz->dims[vdim].is == p->vecsz->dims[vdim].os);
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N = X(tensor_sz)(p->sz);
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Nc = (N / p->sz->dims[p->sz->rnk-1].n) *
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(p->sz->dims[p->sz->rnk-1].n/2 + 1);
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X(rdft2_strides)(p->kind, p->sz->dims + p->sz->rnk - 1, &rs, &cs);
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/* the factor of 2 comes from the fact that RS is the stride
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of p->r0 and p->r1, which is twice as large as the strides
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in the r2r case */
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return(p->vecsz->dims[vdim].is == p->vecsz->dims[vdim].os
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&& (X(iabs)(2 * p->vecsz->dims[vdim].os)
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>= X(imax)(2 * Nc * X(iabs)(cs), N * X(iabs)(rs))));
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}
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