/*

 * Copyright (c) 2003, 2007-14 Matteo Frigo

 * Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

 *

 */

#include "kernel/ifftw.h"

INT X(tensor_max_index)(const tensor *sz)

{

     int i;

     INT ni = 0, no = 0;

     A(FINITE_RNK(sz->rnk));

     for (i = 0; i < sz->rnk; ++i) {

          const iodim *p = sz->dims + i;

          ni += (p->n - 1) * X(iabs)(p->is);

          no += (p->n - 1) * X(iabs)(p->os);

     }

     return X(imax)(ni, no);

}

#define tensor_min_xstride(sz, xs) {     \

     A(FINITE_RNK(sz->rnk));        \

     if (sz->rnk == 0) return 0;     \

     else {           \

          int i;          \

          INT s = X(iabs)(sz->dims[0].xs);   \

          for (i = 1; i < sz->rnk; ++i)     \

               s = X(imin)(s, X(iabs)(sz->dims[i].xs)); \

          return s;         \

     }              \

}

fftw_tensor_min_istride

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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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}

fftw_tensor_min_ostride

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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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}

INT X(tensor_min_istride)(const tensor *sz) tensor_min_xstride(sz, is)

INT X(tensor_min_ostride)(const tensor *sz) tensor_min_xstride(sz, os)

INT X(tensor_min_stride)(const tensor *sz)

{

     return X(imin)(X(tensor_min_istride)(sz), X(tensor_min_ostride)(sz));

}

int X(tensor_inplace_strides)(const tensor *sz)

{

     int i;

     A(FINITE_RNK(sz->rnk));

     for (i = 0; i < sz->rnk; ++i) {

          const iodim *p = sz->dims + i;

          if (p->is != p->os)

               return 0;

     }

     return 1;

}

int X(tensor_inplace_strides2)(const tensor *a, const tensor *b)

{

     return X(tensor_inplace_strides(a)) && X(tensor_inplace_strides(b));

}

/* return true (1) iff *any* strides of sz decrease when we

   tensor_inplace_copy(sz, k). */

static int tensor_strides_decrease(const tensor *sz, inplace_kind k)

{

     if (FINITE_RNK(sz->rnk)) {

          int i;

          for (i = 0; i < sz->rnk; ++i)

               if ((sz->dims[i].os - sz->dims[i].is)

                   * (k == INPLACE_OS ? (INT)1 : (INT)-1) < 0)

                    return 1;

     }

     return 0;

}

/* Return true (1) iff *any* strides of sz decrease when we

   tensor_inplace_copy(k) *or* if *all* strides of sz are unchanged

   but *any* strides of vecsz decrease.  This is used in indirect.c

   to determine whether to use INPLACE_IS or INPLACE_OS.

   Note: X(tensor_strides_decrease)(sz, vecsz, INPLACE_IS)

         || X(tensor_strides_decrease)(sz, vecsz, INPLACE_OS)

         || X(tensor_inplace_strides2)(p->sz, p->vecsz)

   must always be true. */

int X(tensor_strides_decrease)(const tensor *sz, const tensor *vecsz,

             inplace_kind k)

{

     return(tensor_strides_decrease(sz, k)

      || (X(tensor_inplace_strides)(sz)

    && tensor_strides_decrease(vecsz, k)));

}