/*

 * 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"

static void dimcpy(iodim *dst, const iodim *src, int rnk)

{

     int i;

     if (FINITE_RNK(rnk))

          for (i = 0; i < rnk; ++i)

               dst[i] = src[i];

}

tensor *X(tensor_copy)(const tensor *sz)

{

     tensor *x = X(mktensor)(sz->rnk);

     dimcpy(x->dims, sz->dims, sz->rnk);

     return x;

}

/* like X(tensor_copy), but makes strides in-place by

   setting os = is if k == INPLACE_IS or is = os if k == INPLACE_OS. */

tensor *X(tensor_copy_inplace)(const tensor *sz, inplace_kind k)

{

     tensor *x = X(tensor_copy)(sz);

     if (FINITE_RNK(x->rnk)) {

    int i;

    if (k == INPLACE_OS)

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

        x->dims[i].is = x->dims[i].os;

    else

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

        x->dims[i].os = x->dims[i].is;

     }

     return x;

}

/* Like X(tensor_copy), but copy all of the dimensions *except*

   except_dim. */

tensor *X(tensor_copy_except)(const tensor *sz, int except_dim)

{

     tensor *x;

     A(FINITE_RNK(sz->rnk) && sz->rnk >= 1 && except_dim < sz->rnk);

     x = X(mktensor)(sz->rnk - 1);

     dimcpy(x->dims, sz->dims, except_dim);

     dimcpy(x->dims + except_dim, sz->dims + except_dim + 1,

            x->rnk - except_dim);

     return x;

}

/* Like X(tensor_copy), but copy only rnk dimensions starting

   with start_dim. */

tensor *X(tensor_copy_sub)(const tensor *sz, int start_dim, int rnk)

{

     tensor *x;

     A(FINITE_RNK(sz->rnk) && start_dim + rnk <= sz->rnk);

     x = X(mktensor)(rnk);

     dimcpy(x->dims, sz->dims + start_dim, rnk);

     return x;

}

tensor *X(tensor_append)(const tensor *a, const tensor *b)

{

     if (!FINITE_RNK(a->rnk) || !FINITE_RNK(b->rnk)) {

          return X(mktensor)(RNK_MINFTY);

     } else {

    tensor *x = X(mktensor)(a->rnk + b->rnk);

          dimcpy(x->dims, a->dims, a->rnk);

          dimcpy(x->dims + a->rnk, b->dims, b->rnk);

    return x;

     }

}