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/* Helper function for repacking arrays.

   Copyright 2003, 2006, 2007, 2009 Free Software Foundation, Inc.

   Contributed by Paul Brook <paul@nowt.org>

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 <stdlib.h>

#include <assert.h>

#include <string.h>

#if defined (HAVE_GFC_COMPLEX_4)

void

internal_unpack_c4 (gfc_array_c4 * d, const GFC_COMPLEX_4 * src)

{

  index_type count[GFC_MAX_DIMENSIONS];

  index_type extent[GFC_MAX_DIMENSIONS];

  index_type stride[GFC_MAX_DIMENSIONS];

  index_type stride0;

  index_type dim;

  index_type dsize;

  GFC_COMPLEX_4 * restrict dest;

  int n;

  dest = d->data;

  if (src == dest || !src)

    return;

  dim = GFC_DESCRIPTOR_RANK (d);

  dsize = 1;

  for (n = 0; n < dim; n++)

    {

      count[n] = 0;

      stride[n] = GFC_DESCRIPTOR_STRIDE(d,n);

      extent[n] = GFC_DESCRIPTOR_EXTENT(d,n);

      if (extent[n] <= 0)

        return;

      if (dsize == stride[n])

        dsize *= extent[n];

      else

        dsize = 0;

    }

  if (dsize != 0)

    {

      memcpy (dest, src, dsize * sizeof (GFC_COMPLEX_4));

      return;

    }

  stride0 = stride[0];

  while (dest)

    {

      /* Copy the data.  */

      *dest = *(src++);

      /* Advance to the next element.  */

      dest += stride0;

      count[0]++;

      /* Advance to the next source element.  */

      n = 0;

      while (count[n] == extent[n])

        {

          /* When we get to the end of a dimension, reset it and increment

             the next dimension.  */

          count[n] = 0;

          /* We could precalculate these products, but this is a less

             frequently used path so probably not worth it.  */

          dest -= stride[n] * extent[n];

          n++;

          if (n == dim)

            {

              dest = NULL;

              break;

            }

          else

            {

              count[n]++;

              dest += stride[n];

            }

        }

    }

}

#endif