gcc/libgfortran/m4/transpose.m4

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

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

Libgfor is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

Ligbfor 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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with libgfor; see the file COPYING.LIB.  If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

#include "config.h"
#include <assert.h>
#include "libgfortran.h"'
include(iparm.m4)dnl

void
`__transpose_'rtype_kind (rtype * ret, rtype * source)
{
  /* r.* indicates the return array.  */
  index_type rxstride, rystride;
  rtype_name *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->dim[0].stride == 0)
    ret->dim[0].stride = 1;
  if (source->dim[0].stride == 0)
    source->dim[0].stride = 1;

  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);
    }
}