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/* Generic implementation of the UNPACK intrinsic

   Copyright 2002, 2003, 2004, 2005 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 2 of the License, or (at your option) any later version.

In addition to the permissions in the GNU General Public License, the

Free Software Foundation gives you unlimited permission to link the

compiled version of this file into combinations with other programs,

and to distribute those combinations without any restriction coming

from the use of this file.  (The General Public License restrictions

do apply in other respects; for example, they cover modification of

the file, and distribution when not linked into a combine

executable.)

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.

You should have received a copy of the GNU General Public

License along with libgfortran; see the file COPYING.  If not,

write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,

Boston, MA 02110-1301, USA.  */

#include "config.h"

#include <stdlib.h>

#include <assert.h>

#include <string.h>

#include "libgfortran.h"

static void

unpack_internal (gfc_array_char *ret, const gfc_array_char *vector,

                 const gfc_array_l4 *mask, const gfc_array_char *field,

                 index_type size, index_type fsize)

{

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

  index_type rstride[GFC_MAX_DIMENSIONS];

  index_type rstride0;

  index_type rs;

  char *rptr;

  /* v.* indicates the vector array.  */

  index_type vstride0;

  char *vptr;

  /* f.* indicates the field array.  */

  index_type fstride[GFC_MAX_DIMENSIONS];

  index_type fstride0;

  const char *fptr;

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

  index_type mstride[GFC_MAX_DIMENSIONS];

  index_type mstride0;

  const GFC_LOGICAL_4 *mptr;

  index_type count[GFC_MAX_DIMENSIONS];

  index_type extent[GFC_MAX_DIMENSIONS];

  index_type n;

  index_type dim;

  if (ret->data == NULL)

    {

      /* The front end has signalled that we need to populate the

         return array descriptor.  */

      dim = GFC_DESCRIPTOR_RANK (mask);

      rs = 1;

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

        {

          count[n] = 0;

          ret->dim[n].stride = rs;

          ret->dim[n].lbound = 0;

          ret->dim[n].ubound = mask->dim[n].ubound - mask->dim[n].lbound;

          extent[n] = ret->dim[n].ubound + 1;

          rstride[n] = ret->dim[n].stride * size;

          fstride[n] = field->dim[n].stride * fsize;

          mstride[n] = mask->dim[n].stride;

          rs *= extent[n];

        }

      ret->offset = 0;

      ret->data = internal_malloc_size (rs * size);

    }

  else

    {

      dim = GFC_DESCRIPTOR_RANK (ret);

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

        {

          count[n] = 0;

          extent[n] = ret->dim[n].ubound + 1 - ret->dim[n].lbound;

          rstride[n] = ret->dim[n].stride * size;

          fstride[n] = field->dim[n].stride * fsize;

          mstride[n] = mask->dim[n].stride;

        }

      if (rstride[0] == 0)

        rstride[0] = size;

    }

  if (fstride[0] == 0)

    fstride[0] = fsize;

  if (mstride[0] == 0)

    mstride[0] = 1;

  vstride0 = vector->dim[0].stride * size;

  if (vstride0 == 0)

    vstride0 = size;

  rstride0 = rstride[0];

  fstride0 = fstride[0];

  mstride0 = mstride[0];

  rptr = ret->data;

  fptr = field->data;

  mptr = mask->data;

  vptr = vector->data;

  /* Use the same loop for both logical types. */

  if (GFC_DESCRIPTOR_SIZE (mask) != 4)

    {

      if (GFC_DESCRIPTOR_SIZE (mask) != 8)

        runtime_error ("Funny sized logical array");

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

        mstride[n] <<= 1;

      mstride0 <<= 1;

      mptr = GFOR_POINTER_L8_TO_L4 (mptr);

    }

  while (rptr)

    {

      if (*mptr)

        {

          /* From vector.  */

          memcpy (rptr, vptr, size);

          vptr += vstride0;

        }

      else

        {

          /* From field.  */

          memcpy (rptr, fptr, size);

        }

      /* Advance to the next element.  */

      rptr += rstride0;

      fptr += fstride0;

      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 proabably not worth it.  */

          rptr -= rstride[n] * extent[n];

          fptr -= fstride[n] * extent[n];

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

          n++;

          if (n >= dim)

            {

              /* Break out of the loop.  */

              rptr = NULL;

              break;

            }

          else

            {

              count[n]++;

              rptr += rstride[n];

              fptr += fstride[n];

              mptr += mstride[n];

            }

        }

    }

}

extern void unpack1 (gfc_array_char *, const gfc_array_char *,

                     const gfc_array_l4 *, const gfc_array_char *);

export_proto(unpack1);

void

unpack1 (gfc_array_char *ret, const gfc_array_char *vector,

         const gfc_array_l4 *mask, const gfc_array_char *field)

{

  unpack_internal (ret, vector, mask, field,

                   GFC_DESCRIPTOR_SIZE (vector),

                   GFC_DESCRIPTOR_SIZE (field));

}

extern void unpack1_char (gfc_array_char *, GFC_INTEGER_4,

                          const gfc_array_char *, const gfc_array_l4 *,

                          const gfc_array_char *, GFC_INTEGER_4,

                          GFC_INTEGER_4);

export_proto(unpack1_char);

void

unpack1_char (gfc_array_char *ret,

              GFC_INTEGER_4 ret_length __attribute__((unused)),

              const gfc_array_char *vector, const gfc_array_l4 *mask,

              const gfc_array_char *field, GFC_INTEGER_4 vector_length,

              GFC_INTEGER_4 field_length)

{

  unpack_internal (ret, vector, mask, field, vector_length, field_length);

}

extern void unpack0 (gfc_array_char *, const gfc_array_char *,

                     const gfc_array_l4 *, char *);

export_proto(unpack0);

void

unpack0 (gfc_array_char *ret, const gfc_array_char *vector,

         const gfc_array_l4 *mask, char *field)

{

  gfc_array_char tmp;

  tmp.dtype = 0;

  tmp.data = field;

  unpack_internal (ret, vector, mask, &tmp, GFC_DESCRIPTOR_SIZE (vector), 0);

}

extern void unpack0_char (gfc_array_char *, GFC_INTEGER_4,

                          const gfc_array_char *, const gfc_array_l4 *,

                          char *, GFC_INTEGER_4, GFC_INTEGER_4);

export_proto(unpack0_char);

void

unpack0_char (gfc_array_char *ret,

              GFC_INTEGER_4 ret_length __attribute__((unused)),

              const gfc_array_char *vector, const gfc_array_l4 *mask,

              char *field, GFC_INTEGER_4 vector_length,

              GFC_INTEGER_4 field_length __attribute__((unused)))

{

  gfc_array_char tmp;

  tmp.dtype = 0;

  tmp.data = field;

  unpack_internal (ret, vector, mask, &tmp, vector_length, 0);

}