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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>

#if defined (HAVE_GFC_REAL_8)

/* Allocates a block of memory with internal_malloc if the array needs

   repacking.  */

GFC_REAL_8 *

internal_pack_r8 (gfc_array_r8 * source)

{

  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 ssize;

  const GFC_REAL_8 *src;

  GFC_REAL_8 * restrict dest;

  GFC_REAL_8 *destptr;

  int n;

  int packed;

  /* TODO: Investigate how we can figure out if this is a temporary

     since the stride=0 thing has been removed from the frontend.  */

  dim = GFC_DESCRIPTOR_RANK (source);

  ssize = 1;

  packed = 1;

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

    {

      count[n] = 0;

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

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

      if (extent[n] <= 0)

        {

          /* Do nothing.  */

          packed = 1;

          break;

        }

      if (ssize != stride[n])

        packed = 0;

      ssize *= extent[n];

    }

  if (packed)

    return source->data;

  /* Allocate storage for the destination.  */

  destptr = (GFC_REAL_8 *)internal_malloc_size (ssize * sizeof (GFC_REAL_8));

  dest = destptr;

  src = source->data;

  stride0 = stride[0];

  while (src)

    {

      /* Copy the data.  */

      *(dest++) = *src;

      /* Advance to the next element.  */

      src += 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.  */

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

          n++;

          if (n == dim)

            {

              src = NULL;

              break;

            }

          else

            {

              count[n]++;

              src += stride[n];

            }

        }

    }

  return destptr;

}

#endif