gcc/libgfortran/m4/transpose.m4

`/* Implementation of the TRANSPOSE intrinsic
   Copyright 2003, 2005, 2006, 2007, 2009 Free Software Foundation, Inc.
   Contributed by Tobias Schl<68>ter

This file is part of the GNU Fortran 95 runtime library (libgfortran).

Libgfortran 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 3 of the License, or (at your option) any later version.

Libgfortran 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.

Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.

You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
<http://www.gnu.org/licenses/>.  */

#include "libgfortran.h"
#include <assert.h>'

include(iparm.m4)dnl

`#if defined (HAVE_'rtype_name`)

extern void transpose_'rtype_code` ('rtype` * const restrict ret, 
	'rtype` * const restrict source);
export_proto(transpose_'rtype_code`);

void
transpose_'rtype_code` ('rtype` * const restrict ret, 
	'rtype` * const restrict source)
{
  /* r.* indicates the return array.  */
  index_type rxstride, rystride;
  'rtype_name` * restrict rptr;
  /* s.* indicates the source array.  */
  index_type sxstride, systride;
  const 'rtype_name` *sptr;

  index_type xcount, ycount;
  index_type x, y;

  assert (GFC_DESCRIPTOR_RANK (source) == 2);

  if (ret->data == NULL)
    {
      assert (GFC_DESCRIPTOR_RANK (ret) == 2);
      assert (ret->dtype == source->dtype);

      ret->dim[0].lbound = 0;
      ret->dim[0].ubound = source->dim[1].ubound - source->dim[1].lbound;
      ret->dim[0].stride = 1;

      ret->dim[1].lbound = 0;
      ret->dim[1].ubound = source->dim[0].ubound - source->dim[0].lbound;
      ret->dim[1].stride = ret->dim[0].ubound+1;

      ret->data = internal_malloc_size (sizeof ('rtype_name`) * size0 ((array_t *) ret));
      ret->offset = 0;
    } else if (unlikely (compile_options.bounds_check))
    {
      index_type ret_extent, src_extent;

      ret_extent = ret->dim[0].ubound + 1 - ret->dim[0].lbound;
      src_extent = source->dim[1].ubound + 1 - source->dim[1].lbound;

      if (src_extent != ret_extent)
	runtime_error ("Incorrect extent in return value of TRANSPOSE"
		       " intrinsic in dimension 1: is %ld,"
		       " should be %ld", (long int) src_extent,
		       (long int) ret_extent);

      ret_extent = ret->dim[1].ubound + 1 - ret->dim[1].lbound;
      src_extent = source->dim[0].ubound + 1 - source->dim[0].lbound;

      if (src_extent != ret_extent)
	runtime_error ("Incorrect extent in return value of TRANSPOSE"
		       " intrinsic in dimension 2: is %ld,"
		       " should be %ld", (long int) src_extent,
		       (long int) ret_extent);

    }

  sxstride = source->dim[0].stride;
  systride = source->dim[1].stride;
  xcount = source->dim[0].ubound + 1 - source->dim[0].lbound;
  ycount = source->dim[1].ubound + 1 - source->dim[1].lbound;

  rxstride = ret->dim[0].stride;
  rystride = ret->dim[1].stride;

  rptr = ret->data;
  sptr = source->data;

  for (y=0; y < ycount; y++)
    {
      for (x=0; x < xcount; x++)
        {
          *rptr = *sptr;

          sptr += sxstride;
          rptr += rystride;
        }
        sptr += systride - (sxstride * xcount);
        rptr += rxstride - (rystride * xcount);
    }
}

#endif'