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/* Specific implementation of the PACK intrinsic

   Copyright (C) 2002, 2004, 2005, 2006, 2007, 2008, 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.

Ligbfortran 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_INTEGER_2)

/* PACK is specified as follows:

   13.14.80 PACK (ARRAY, MASK, [VECTOR])

   Description: Pack an array into an array of rank one under the

   control of a mask.

   Class: Transformational function.

   Arguments:

      ARRAY   may be of any type. It shall not be scalar.

      MASK    shall be of type LOGICAL. It shall be conformable with ARRAY.

      VECTOR  (optional) shall be of the same type and type parameters

              as ARRAY. VECTOR shall have at least as many elements as

              there are true elements in MASK. If MASK is a scalar

              with the value true, VECTOR shall have at least as many

              elements as there are in ARRAY.

   Result Characteristics: The result is an array of rank one with the

   same type and type parameters as ARRAY. If VECTOR is present, the

   result size is that of VECTOR; otherwise, the result size is the

   number /t/ of true elements in MASK unless MASK is scalar with the

   value true, in which case the result size is the size of ARRAY.

   Result Value: Element /i/ of the result is the element of ARRAY

   that corresponds to the /i/th true element of MASK, taking elements

   in array element order, for /i/ = 1, 2, ..., /t/. If VECTOR is

   present and has size /n/ > /t/, element /i/ of the result has the

   value VECTOR(/i/), for /i/ = /t/ + 1, ..., /n/.

   Examples: The nonzero elements of an array M with the value

   | 0 0 0 |

   | 9 0 0 | may be "gathered" by the function PACK. The result of

   | 0 0 7 |

   PACK (M, MASK = M.NE.0) is [9,7] and the result of PACK (M, M.NE.0,

   VECTOR = (/ 2,4,6,8,10,12 /)) is [9,7,6,8,10,12].

There are two variants of the PACK intrinsic: one, where MASK is

array valued, and the other one where MASK is scalar.  */

void

pack_i2 (gfc_array_i2 *ret, const gfc_array_i2 *array,

               const gfc_array_l1 *mask, const gfc_array_i2 *vector)

{

  /* r.* indicates the return array.  */

  index_type rstride0;

  GFC_INTEGER_2 * restrict rptr;

  /* s.* indicates the source array.  */

  index_type sstride[GFC_MAX_DIMENSIONS];

  index_type sstride0;

  const GFC_INTEGER_2 *sptr;

  /* m.* indicates the mask array.  */

  index_type mstride[GFC_MAX_DIMENSIONS];

  index_type mstride0;

  const GFC_LOGICAL_1 *mptr;

  index_type count[GFC_MAX_DIMENSIONS];

  index_type extent[GFC_MAX_DIMENSIONS];

  int zero_sized;

  index_type n;

  index_type dim;

  index_type nelem;

  index_type total;

  int mask_kind;

  dim = GFC_DESCRIPTOR_RANK (array);

  mptr = mask->data;

  /* Use the same loop for all logical types, by using GFC_LOGICAL_1

     and using shifting to address size and endian issues.  */

  mask_kind = GFC_DESCRIPTOR_SIZE (mask);

  if (mask_kind == 1 || mask_kind == 2 || mask_kind == 4 || mask_kind == 8

#ifdef HAVE_GFC_LOGICAL_16

      || mask_kind == 16

#endif

      )

    {

      /*  Do not convert a NULL pointer as we use test for NULL below.  */

      if (mptr)

        mptr = GFOR_POINTER_TO_L1 (mptr, mask_kind);

    }

  else

    runtime_error ("Funny sized logical array");

  zero_sized = 0;

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

    {

      count[n] = 0;

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

      if (extent[n] <= 0)

       zero_sized = 1;

      sstride[n] = GFC_DESCRIPTOR_STRIDE(array,n);

      mstride[n] = GFC_DESCRIPTOR_STRIDE_BYTES(mask,n);

    }

  if (sstride[0] == 0)

    sstride[0] = 1;

  if (mstride[0] == 0)

    mstride[0] = mask_kind;

  if (zero_sized)

    sptr = NULL;

  else

    sptr = array->data;

  if (ret->data == NULL || unlikely (compile_options.bounds_check))

    {

      /* Count the elements, either for allocating memory or

         for bounds checking.  */

      if (vector != NULL)

        {

          /* The return array will have as many

             elements as there are in VECTOR.  */

          total = GFC_DESCRIPTOR_EXTENT(vector,0);

          if (total < 0)

            {

              total = 0;

              vector = NULL;

            }

        }

      else

        {

          /* We have to count the true elements in MASK.  */

          total = count_0 (mask);

        }

      if (ret->data == NULL)

        {

          /* Setup the array descriptor.  */

          GFC_DIMENSION_SET(ret->dim[0], 0, total-1, 1);

          ret->offset = 0;

          /* internal_malloc_size allocates a single byte for zero size.  */

          ret->data = internal_malloc_size (sizeof (GFC_INTEGER_2) * total);

          if (total == 0)

            return;

        }

      else

        {

          /* We come here because of range checking.  */

          index_type ret_extent;

          ret_extent = GFC_DESCRIPTOR_EXTENT(ret,0);

          if (total != ret_extent)

            runtime_error ("Incorrect extent in return value of PACK intrinsic;"

                           " is %ld, should be %ld", (long int) total,

                           (long int) ret_extent);

        }

    }

  rstride0 = GFC_DESCRIPTOR_STRIDE(ret,0);

  if (rstride0 == 0)

    rstride0 = 1;

  sstride0 = sstride[0];

  mstride0 = mstride[0];

  rptr = ret->data;

  while (sptr && mptr)

    {

      /* Test this element.  */

      if (*mptr)

        {

          /* Add it.  */

          *rptr = *sptr;

          rptr += rstride0;

        }

      /* Advance to the next element.  */

      sptr += sstride0;

      mptr += mstride0;

      count[0]++;

      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.  */

          sptr -= sstride[n] * extent[n];

          mptr -= mstride[n] * extent[n];

          n++;

          if (n >= dim)

            {

              /* Break out of the loop.  */

              sptr = NULL;

              break;

            }

          else

            {

              count[n]++;

              sptr += sstride[n];

              mptr += mstride[n];

            }

        }

    }

  /* Add any remaining elements from VECTOR.  */

  if (vector)

    {

      n = GFC_DESCRIPTOR_EXTENT(vector,0);

      nelem = ((rptr - ret->data) / rstride0);

      if (n > nelem)

        {

          sstride0 = GFC_DESCRIPTOR_STRIDE(vector,0);

          if (sstride0 == 0)

            sstride0 = 1;

          sptr = vector->data + sstride0 * nelem;

          n -= nelem;

          while (n--)

            {

              *rptr = *sptr;

              rptr += rstride0;

              sptr += sstride0;

            }

        }

    }

}

#endif