Chris@42: /*
Chris@42:  * Copyright (c) 2003, 2007-14 Matteo Frigo
Chris@42:  * Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
Chris@42:  *
Chris@42:  * This program is free software; you can redistribute it and/or modify
Chris@42:  * it under the terms of the GNU General Public License as published by
Chris@42:  * the Free Software Foundation; either version 2 of the License, or
Chris@42:  * (at your option) any later version.
Chris@42:  *
Chris@42:  * This program is distributed in the hope that it will be useful,
Chris@42:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
Chris@42:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
Chris@42:  * GNU General Public License for more details.
Chris@42:  *
Chris@42:  * You should have received a copy of the GNU General Public License
Chris@42:  * along with this program; if not, write to the Free Software
Chris@42:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
Chris@42:  *
Chris@42:  */
Chris@42: 
Chris@42: 
Chris@42: #include "ifftw.h"
Chris@42: 
Chris@42: static void dimcpy(iodim *dst, const iodim *src, int rnk)
Chris@42: {
Chris@42:      int i;
Chris@42:      if (FINITE_RNK(rnk))
Chris@42:           for (i = 0; i < rnk; ++i)
Chris@42:                dst[i] = src[i];
Chris@42: }
Chris@42: 
Chris@42: tensor *X(tensor_copy)(const tensor *sz)
Chris@42: {
Chris@42:      tensor *x = X(mktensor)(sz->rnk);
Chris@42:      dimcpy(x->dims, sz->dims, sz->rnk);
Chris@42:      return x;
Chris@42: }
Chris@42: 
Chris@42: /* like X(tensor_copy), but makes strides in-place by
Chris@42:    setting os = is if k == INPLACE_IS or is = os if k == INPLACE_OS. */
Chris@42: tensor *X(tensor_copy_inplace)(const tensor *sz, inplace_kind k)
Chris@42: {
Chris@42:      tensor *x = X(tensor_copy)(sz);
Chris@42:      if (FINITE_RNK(x->rnk)) {
Chris@42: 	  int i;
Chris@42: 	  if (k == INPLACE_OS)
Chris@42: 	       for (i = 0; i < x->rnk; ++i)
Chris@42: 		    x->dims[i].is = x->dims[i].os;
Chris@42: 	  else
Chris@42: 	       for (i = 0; i < x->rnk; ++i)
Chris@42: 		    x->dims[i].os = x->dims[i].is;
Chris@42:      }
Chris@42:      return x;
Chris@42: }
Chris@42: 
Chris@42: /* Like X(tensor_copy), but copy all of the dimensions *except*
Chris@42:    except_dim. */
Chris@42: tensor *X(tensor_copy_except)(const tensor *sz, int except_dim)
Chris@42: {
Chris@42:      tensor *x;
Chris@42: 
Chris@42:      A(FINITE_RNK(sz->rnk) && sz->rnk >= 1 && except_dim < sz->rnk);
Chris@42:      x = X(mktensor)(sz->rnk - 1);
Chris@42:      dimcpy(x->dims, sz->dims, except_dim);
Chris@42:      dimcpy(x->dims + except_dim, sz->dims + except_dim + 1,
Chris@42:             x->rnk - except_dim);
Chris@42:      return x;
Chris@42: }
Chris@42: 
Chris@42: /* Like X(tensor_copy), but copy only rnk dimensions starting
Chris@42:    with start_dim. */
Chris@42: tensor *X(tensor_copy_sub)(const tensor *sz, int start_dim, int rnk)
Chris@42: {
Chris@42:      tensor *x;
Chris@42: 
Chris@42:      A(FINITE_RNK(sz->rnk) && start_dim + rnk <= sz->rnk);
Chris@42:      x = X(mktensor)(rnk);
Chris@42:      dimcpy(x->dims, sz->dims + start_dim, rnk);
Chris@42:      return x;
Chris@42: }
Chris@42: 
Chris@42: tensor *X(tensor_append)(const tensor *a, const tensor *b)
Chris@42: {
Chris@42:      if (!FINITE_RNK(a->rnk) || !FINITE_RNK(b->rnk)) {
Chris@42:           return X(mktensor)(RNK_MINFTY);
Chris@42:      } else {
Chris@42: 	  tensor *x = X(mktensor)(a->rnk + b->rnk);
Chris@42:           dimcpy(x->dims, a->dims, a->rnk);
Chris@42:           dimcpy(x->dims + a->rnk, b->dims, b->rnk);
Chris@42: 	  return x;
Chris@42:      }
Chris@42: }