Chris@19: /*
Chris@19:  * Copyright (c) 2003, 2007-14 Matteo Frigo
Chris@19:  * Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
Chris@19:  *
Chris@19:  * This program is free software; you can redistribute it and/or modify
Chris@19:  * it under the terms of the GNU General Public License as published by
Chris@19:  * the Free Software Foundation; either version 2 of the License, or
Chris@19:  * (at your option) any later version.
Chris@19:  *
Chris@19:  * This program is distributed in the hope that it will be useful,
Chris@19:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
Chris@19:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
Chris@19:  * GNU General Public License for more details.
Chris@19:  *
Chris@19:  * You should have received a copy of the GNU General Public License
Chris@19:  * along with this program; if not, write to the Free Software
Chris@19:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
Chris@19:  *
Chris@19:  */
Chris@19: 
Chris@19: 
Chris@19: #include "ifftw.h"
Chris@19: 
Chris@19: static void dimcpy(iodim *dst, const iodim *src, int rnk)
Chris@19: {
Chris@19:      int i;
Chris@19:      if (FINITE_RNK(rnk))
Chris@19:           for (i = 0; i < rnk; ++i)
Chris@19:                dst[i] = src[i];
Chris@19: }
Chris@19: 
Chris@19: tensor *X(tensor_copy)(const tensor *sz)
Chris@19: {
Chris@19:      tensor *x = X(mktensor)(sz->rnk);
Chris@19:      dimcpy(x->dims, sz->dims, sz->rnk);
Chris@19:      return x;
Chris@19: }
Chris@19: 
Chris@19: /* like X(tensor_copy), but makes strides in-place by
Chris@19:    setting os = is if k == INPLACE_IS or is = os if k == INPLACE_OS. */
Chris@19: tensor *X(tensor_copy_inplace)(const tensor *sz, inplace_kind k)
Chris@19: {
Chris@19:      tensor *x = X(tensor_copy)(sz);
Chris@19:      if (FINITE_RNK(x->rnk)) {
Chris@19: 	  int i;
Chris@19: 	  if (k == INPLACE_OS)
Chris@19: 	       for (i = 0; i < x->rnk; ++i)
Chris@19: 		    x->dims[i].is = x->dims[i].os;
Chris@19: 	  else
Chris@19: 	       for (i = 0; i < x->rnk; ++i)
Chris@19: 		    x->dims[i].os = x->dims[i].is;
Chris@19:      }
Chris@19:      return x;
Chris@19: }
Chris@19: 
Chris@19: /* Like X(tensor_copy), but copy all of the dimensions *except*
Chris@19:    except_dim. */
Chris@19: tensor *X(tensor_copy_except)(const tensor *sz, int except_dim)
Chris@19: {
Chris@19:      tensor *x;
Chris@19: 
Chris@19:      A(FINITE_RNK(sz->rnk) && sz->rnk >= 1 && except_dim < sz->rnk);
Chris@19:      x = X(mktensor)(sz->rnk - 1);
Chris@19:      dimcpy(x->dims, sz->dims, except_dim);
Chris@19:      dimcpy(x->dims + except_dim, sz->dims + except_dim + 1,
Chris@19:             x->rnk - except_dim);
Chris@19:      return x;
Chris@19: }
Chris@19: 
Chris@19: /* Like X(tensor_copy), but copy only rnk dimensions starting
Chris@19:    with start_dim. */
Chris@19: tensor *X(tensor_copy_sub)(const tensor *sz, int start_dim, int rnk)
Chris@19: {
Chris@19:      tensor *x;
Chris@19: 
Chris@19:      A(FINITE_RNK(sz->rnk) && start_dim + rnk <= sz->rnk);
Chris@19:      x = X(mktensor)(rnk);
Chris@19:      dimcpy(x->dims, sz->dims + start_dim, rnk);
Chris@19:      return x;
Chris@19: }
Chris@19: 
Chris@19: tensor *X(tensor_append)(const tensor *a, const tensor *b)
Chris@19: {
Chris@19:      if (!FINITE_RNK(a->rnk) || !FINITE_RNK(b->rnk)) {
Chris@19:           return X(mktensor)(RNK_MINFTY);
Chris@19:      } else {
Chris@19: 	  tensor *x = X(mktensor)(a->rnk + b->rnk);
Chris@19:           dimcpy(x->dims, a->dims, a->rnk);
Chris@19:           dimcpy(x->dims + a->rnk, b->dims, b->rnk);
Chris@19: 	  return x;
Chris@19:      }
Chris@19: }