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/* Special implementation of the SPREAD intrinsic

   Copyright 2008, 2009 Free Software Foundation, Inc.

   Contributed by Thomas Koenig <tkoenig@gcc.gnu.org>, based on

   spread_generic.c written 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_REAL_4)

void

spread_r4 (gfc_array_r4 *ret, const gfc_array_r4 *source,

                 const index_type along, const index_type pncopies)

{

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

  index_type rstride[GFC_MAX_DIMENSIONS];

  index_type rstride0;

  index_type rdelta = 0;

  index_type rrank;

  index_type rs;

  GFC_REAL_4 *rptr;

  GFC_REAL_4 * restrict dest;

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

  index_type sstride[GFC_MAX_DIMENSIONS];

  index_type sstride0;

  index_type srank;

  const GFC_REAL_4 *sptr;

  index_type count[GFC_MAX_DIMENSIONS];

  index_type extent[GFC_MAX_DIMENSIONS];

  index_type n;

  index_type dim;

  index_type ncopies;

  srank = GFC_DESCRIPTOR_RANK(source);

  rrank = srank + 1;

  if (rrank > GFC_MAX_DIMENSIONS)

    runtime_error ("return rank too large in spread()");

  if (along > rrank)

      runtime_error ("dim outside of rank in spread()");

  ncopies = pncopies;

  if (ret->data == NULL)

    {

      size_t ub, stride;

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

         return array descriptor.  */

      ret->dtype = (source->dtype & ~GFC_DTYPE_RANK_MASK) | rrank;

      dim = 0;

      rs = 1;

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

        {

          stride = rs;

          if (n == along - 1)

            {

              ub = ncopies - 1;

              rdelta = rs;

              rs *= ncopies;

            }

          else

            {

              count[dim] = 0;

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

              sstride[dim] = GFC_DESCRIPTOR_STRIDE(source,dim);

              rstride[dim] = rs;

              ub = extent[dim] - 1;

              rs *= extent[dim];

              dim++;

            }

          GFC_DIMENSION_SET(ret->dim[n], 0, ub, stride);

        }

      ret->offset = 0;

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

      ret->data = internal_malloc_size (rs * sizeof(GFC_REAL_4));

      if (rs <= 0)

        return;

    }

  else

    {

      int zero_sized;

      zero_sized = 0;

      dim = 0;

      if (GFC_DESCRIPTOR_RANK(ret) != rrank)

        runtime_error ("rank mismatch in spread()");

      if (unlikely (compile_options.bounds_check))

        {

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

            {

              index_type ret_extent;

              ret_extent = GFC_DESCRIPTOR_EXTENT(ret,n);

              if (n == along - 1)

                {

                  rdelta = GFC_DESCRIPTOR_STRIDE(ret,n);

                  if (ret_extent != ncopies)

                    runtime_error("Incorrect extent in return value of SPREAD"

                                  " intrinsic in dimension %ld: is %ld,"

                                  " should be %ld", (long int) n+1,

                                  (long int) ret_extent, (long int) ncopies);

                }

              else

                {

                  count[dim] = 0;

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

                  if (ret_extent != extent[dim])

                    runtime_error("Incorrect extent in return value of SPREAD"

                                  " intrinsic in dimension %ld: is %ld,"

                                  " should be %ld", (long int) n+1,

                                  (long int) ret_extent,

                                  (long int) extent[dim]);

                  if (extent[dim] <= 0)

                    zero_sized = 1;

                  sstride[dim] = GFC_DESCRIPTOR_STRIDE(source,dim);

                  rstride[dim] = GFC_DESCRIPTOR_STRIDE(ret,n);

                  dim++;

                }

            }

        }

      else

        {

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

            {

              if (n == along - 1)

                {

                  rdelta = GFC_DESCRIPTOR_STRIDE(ret,n);

                }

              else

                {

                  count[dim] = 0;

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

                  if (extent[dim] <= 0)

                    zero_sized = 1;

                  sstride[dim] = GFC_DESCRIPTOR_STRIDE(source,dim);

                  rstride[dim] = GFC_DESCRIPTOR_STRIDE(ret,n);

                  dim++;

                }

            }

        }

      if (zero_sized)

        return;

      if (sstride[0] == 0)

        sstride[0] = 1;

    }

  sstride0 = sstride[0];

  rstride0 = rstride[0];

  rptr = ret->data;

  sptr = source->data;

  while (sptr)

    {

      /* Spread this element.  */

      dest = rptr;

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

        {

          *dest = *sptr;

          dest += rdelta;

        }

      /* Advance to the next element.  */

      sptr += sstride0;

      rptr += rstride0;

      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];

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

          n++;

          if (n >= srank)

            {

              /* Break out of the loop.  */

              sptr = NULL;

              break;

            }

          else

            {

              count[n]++;

              sptr += sstride[n];

              rptr += rstride[n];

            }

        }

    }

}

/* This version of spread_internal treats the special case of a scalar

   source.  This is much simpler than the more general case above.  */

void

spread_scalar_r4 (gfc_array_r4 *ret, const GFC_REAL_4 *source,

                        const index_type along, const index_type pncopies)

{

  int n;

  int ncopies = pncopies;

  GFC_REAL_4 * restrict dest;

  index_type stride;

  if (GFC_DESCRIPTOR_RANK (ret) != 1)

    runtime_error ("incorrect destination rank in spread()");

  if (along > 1)

    runtime_error ("dim outside of rank in spread()");

  if (ret->data == NULL)

    {

      ret->data = internal_malloc_size (ncopies * sizeof (GFC_REAL_4));

      ret->offset = 0;

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

    }

  else

    {

      if (ncopies - 1 > (GFC_DESCRIPTOR_EXTENT(ret,0) - 1)

                           / GFC_DESCRIPTOR_STRIDE(ret,0))

        runtime_error ("dim too large in spread()");

    }

  dest = ret->data;

  stride = GFC_DESCRIPTOR_STRIDE(ret,0);

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

    {

      *dest = *source;

      dest += stride;

    }

}

#endif