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43 lines
1.5 KiB
C
43 lines
1.5 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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/* like X(tensor_max_index), but takes into account the special n/2+1
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final dimension for the complex output/input of an R2HC/HC2R transform. */
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INT X(rdft2_tensor_max_index)(const tensor *sz, rdft_kind k)
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{
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int i;
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INT n = 0;
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A(FINITE_RNK(sz->rnk));
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for (i = 0; i + 1 < sz->rnk; ++i) {
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const iodim *p = sz->dims + i;
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n += (p->n - 1) * X(imax)(X(iabs)(p->is), X(iabs)(p->os));
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}
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if (i < sz->rnk) {
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const iodim *p = sz->dims + i;
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INT is, os;
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X(rdft2_strides)(k, p, &is, &os);
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n += X(imax)((p->n - 1) * X(iabs)(is), (p->n/2) * X(iabs)(os));
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}
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return n;
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}
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