mirror of
https://github.com/tildearrow/furnace.git
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104 lines
3.2 KiB
C
104 lines
3.2 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 "kernel/ifftw.h"
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INT X(tensor_max_index)(const tensor *sz)
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{
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int i;
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INT ni = 0, no = 0;
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A(FINITE_RNK(sz->rnk));
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for (i = 0; i < sz->rnk; ++i) {
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const iodim *p = sz->dims + i;
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ni += (p->n - 1) * X(iabs)(p->is);
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no += (p->n - 1) * X(iabs)(p->os);
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}
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return X(imax)(ni, no);
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}
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#define tensor_min_xstride(sz, xs) { \
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A(FINITE_RNK(sz->rnk)); \
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if (sz->rnk == 0) return 0; \
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else { \
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int i; \
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INT s = X(iabs)(sz->dims[0].xs); \
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for (i = 1; i < sz->rnk; ++i) \
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s = X(imin)(s, X(iabs)(sz->dims[i].xs)); \
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return s; \
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} \
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}
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INT X(tensor_min_istride)(const tensor *sz) tensor_min_xstride(sz, is)
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INT X(tensor_min_ostride)(const tensor *sz) tensor_min_xstride(sz, os)
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INT X(tensor_min_stride)(const tensor *sz)
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{
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return X(imin)(X(tensor_min_istride)(sz), X(tensor_min_ostride)(sz));
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}
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int X(tensor_inplace_strides)(const tensor *sz)
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{
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int i;
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A(FINITE_RNK(sz->rnk));
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for (i = 0; i < sz->rnk; ++i) {
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const iodim *p = sz->dims + i;
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if (p->is != p->os)
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return 0;
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}
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return 1;
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}
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int X(tensor_inplace_strides2)(const tensor *a, const tensor *b)
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{
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return X(tensor_inplace_strides(a)) && X(tensor_inplace_strides(b));
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}
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/* return true (1) iff *any* strides of sz decrease when we
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tensor_inplace_copy(sz, k). */
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static int tensor_strides_decrease(const tensor *sz, inplace_kind k)
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{
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if (FINITE_RNK(sz->rnk)) {
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int i;
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for (i = 0; i < sz->rnk; ++i)
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if ((sz->dims[i].os - sz->dims[i].is)
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* (k == INPLACE_OS ? (INT)1 : (INT)-1) < 0)
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return 1;
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}
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return 0;
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}
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/* Return true (1) iff *any* strides of sz decrease when we
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tensor_inplace_copy(k) *or* if *all* strides of sz are unchanged
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but *any* strides of vecsz decrease. This is used in indirect.c
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to determine whether to use INPLACE_IS or INPLACE_OS.
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Note: X(tensor_strides_decrease)(sz, vecsz, INPLACE_IS)
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|| X(tensor_strides_decrease)(sz, vecsz, INPLACE_OS)
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|| X(tensor_inplace_strides2)(p->sz, p->vecsz)
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must always be true. */
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int X(tensor_strides_decrease)(const tensor *sz, const tensor *vecsz,
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inplace_kind k)
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{
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return(tensor_strides_decrease(sz, k)
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|| (X(tensor_inplace_strides)(sz)
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&& tensor_strides_decrease(vecsz, k)));
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}
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