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/* Generic implementation of the SPREAD intrinsic

   Copyright 2002, 2005, 2006, 2007, 2009, 2010 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>

static void

spread_internal (gfc_array_char *ret, const gfc_array_char *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;

  char *rptr;

  char *dest;

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

  index_type sstride[GFC_MAX_DIMENSIONS];

  index_type sstride0;

  index_type srank;

  const char *sptr;

  index_type count[GFC_MAX_DIMENSIONS];

  index_type extent[GFC_MAX_DIMENSIONS];

  index_type n;

  index_type dim;

  index_type ncopies;

  index_type size;

  size = GFC_DESCRIPTOR_SIZE(source);

  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)

    {

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

         return array descriptor.  */

      size_t ub, stride;

      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 * size;

              rs *= ncopies;

            }

          else

            {

              count[dim] = 0;

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

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

              rstride[dim] = rs * size;

              ub = extent[dim]-1;

              rs *= extent[dim];

              dim++;

            }

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

        }

      ret->offset = 0;

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

      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 (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_BYTES(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_BYTES(source,dim);

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

                  dim++;

                }

            }

        }

      else

        {

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

            {

              if (n == *along - 1)

                {

                  rdelta = GFC_DESCRIPTOR_STRIDE_BYTES(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_BYTES(source,dim);

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

                  dim++;

                }

            }

        }

      if (zero_sized)

        return;

      if (sstride[0] == 0)

        sstride[0] = size;

    }

  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++)

        {

          memcpy (dest, sptr, size);

          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.  */

static void

spread_internal_scalar (gfc_array_char *ret, const char *source,

                        const index_type *along, const index_type *pncopies)

{

  int n;

  int ncopies = *pncopies;

  char * dest;

  size_t size;

  size = GFC_DESCRIPTOR_SIZE(ret);

  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 * size);

      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()");

    }

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

    {

      dest = (char*)(ret->data + n * GFC_DESCRIPTOR_STRIDE_BYTES(ret,0));

      memcpy (dest , source, size);

    }

}

extern void spread (gfc_array_char *, const gfc_array_char *,

                    const index_type *, const index_type *);

export_proto(spread);

void

spread (gfc_array_char *ret, const gfc_array_char *source,

        const index_type *along, const index_type *pncopies)

{

  index_type type_size;

  type_size = GFC_DTYPE_TYPE_SIZE(ret);

  switch(type_size)

    {

    case GFC_DTYPE_DERIVED_1:

    case GFC_DTYPE_LOGICAL_1:

    case GFC_DTYPE_INTEGER_1:

      spread_i1 ((gfc_array_i1 *) ret, (gfc_array_i1 *) source,

                 *along, *pncopies);

      return;

    case GFC_DTYPE_LOGICAL_2:

    case GFC_DTYPE_INTEGER_2:

      spread_i2 ((gfc_array_i2 *) ret, (gfc_array_i2 *) source,

                 *along, *pncopies);

      return;

    case GFC_DTYPE_LOGICAL_4:

    case GFC_DTYPE_INTEGER_4:

      spread_i4 ((gfc_array_i4 *) ret, (gfc_array_i4 *) source,

                 *along, *pncopies);

      return;

    case GFC_DTYPE_LOGICAL_8:

    case GFC_DTYPE_INTEGER_8:

      spread_i8 ((gfc_array_i8 *) ret, (gfc_array_i8 *) source,

                 *along, *pncopies);

      return;

#ifdef HAVE_GFC_INTEGER_16

    case GFC_DTYPE_LOGICAL_16:

    case GFC_DTYPE_INTEGER_16:

      spread_i16 ((gfc_array_i16 *) ret, (gfc_array_i16 *) source,

                 *along, *pncopies);

      return;

#endif

    case GFC_DTYPE_REAL_4:

      spread_r4 ((gfc_array_r4 *) ret, (gfc_array_r4 *) source,

                 *along, *pncopies);

      return;

    case GFC_DTYPE_REAL_8:

      spread_r8 ((gfc_array_r8 *) ret, (gfc_array_r8 *) source,

                 *along, *pncopies);

      return;

/* FIXME: This here is a hack, which will have to be removed when

   the array descriptor is reworked.  Currently, we don't store the

   kind value for the type, but only the size.  Because on targets with

   __float128, we have sizeof(logn double) == sizeof(__float128),

   we cannot discriminate here and have to fall back to the generic

   handling (which is suboptimal).  */

#if !defined(GFC_REAL_16_IS_FLOAT128)

# ifdef GFC_HAVE_REAL_10

    case GFC_DTYPE_REAL_10:

      spread_r10 ((gfc_array_r10 *) ret, (gfc_array_r10 *) source,

                 *along, *pncopies);

      return;

# endif

# ifdef GFC_HAVE_REAL_16

    case GFC_DTYPE_REAL_16:

      spread_r16 ((gfc_array_r16 *) ret, (gfc_array_r16 *) source,

                 *along, *pncopies);

      return;

# endif

#endif

    case GFC_DTYPE_COMPLEX_4:

      spread_c4 ((gfc_array_c4 *) ret, (gfc_array_c4 *) source,

                 *along, *pncopies);

      return;

    case GFC_DTYPE_COMPLEX_8:

      spread_c8 ((gfc_array_c8 *) ret, (gfc_array_c8 *) source,

                 *along, *pncopies);

      return;

/* FIXME: This here is a hack, which will have to be removed when

   the array descriptor is reworked.  Currently, we don't store the

   kind value for the type, but only the size.  Because on targets with

   __float128, we have sizeof(logn double) == sizeof(__float128),

   we cannot discriminate here and have to fall back to the generic

   handling (which is suboptimal).  */

#if !defined(GFC_REAL_16_IS_FLOAT128)

# ifdef GFC_HAVE_COMPLEX_10

    case GFC_DTYPE_COMPLEX_10:

      spread_c10 ((gfc_array_c10 *) ret, (gfc_array_c10 *) source,

                 *along, *pncopies);

      return;

# endif

# ifdef GFC_HAVE_COMPLEX_16

    case GFC_DTYPE_COMPLEX_16:

      spread_c16 ((gfc_array_c16 *) ret, (gfc_array_c16 *) source,

                 *along, *pncopies);

      return;

# endif

#endif

    case GFC_DTYPE_DERIVED_2:

      if (GFC_UNALIGNED_2(ret->data) || GFC_UNALIGNED_2(source->data))

        break;

      else

        {

          spread_i2 ((gfc_array_i2 *) ret, (gfc_array_i2 *) source,

                     *along, *pncopies);

          return;

        }

    case GFC_DTYPE_DERIVED_4:

      if (GFC_UNALIGNED_4(ret->data) || GFC_UNALIGNED_4(source->data))

        break;

      else

        {

          spread_i4 ((gfc_array_i4 *) ret, (gfc_array_i4 *) source,

                     *along, *pncopies);

          return;

        }

    case GFC_DTYPE_DERIVED_8:

      if (GFC_UNALIGNED_8(ret->data) || GFC_UNALIGNED_8(source->data))

        break;

      else

        {

          spread_i8 ((gfc_array_i8 *) ret, (gfc_array_i8 *) source,

                     *along, *pncopies);

          return;

        }

#ifdef HAVE_GFC_INTEGER_16

    case GFC_DTYPE_DERIVED_16:

      if (GFC_UNALIGNED_16(ret->data) || GFC_UNALIGNED_16(source->data))

        break;

      else

        {

          spread_i16 ((gfc_array_i16 *) ret, (gfc_array_i16 *) source,

                      *along, *pncopies);

          return;

        }

#endif

    }

  spread_internal (ret, source, along, pncopies);

}

extern void spread_char (gfc_array_char *, GFC_INTEGER_4,

                         const gfc_array_char *, const index_type *,

                         const index_type *, GFC_INTEGER_4);

export_proto(spread_char);

void

spread_char (gfc_array_char *ret,

             GFC_INTEGER_4 ret_length __attribute__((unused)),

             const gfc_array_char *source, const index_type *along,

             const index_type *pncopies,

             GFC_INTEGER_4 source_length __attribute__((unused)))

{

  spread_internal (ret, source, along, pncopies);

}

extern void spread_char4 (gfc_array_char *, GFC_INTEGER_4,

                          const gfc_array_char *, const index_type *,

                          const index_type *, GFC_INTEGER_4);

export_proto(spread_char4);

void

spread_char4 (gfc_array_char *ret,

              GFC_INTEGER_4 ret_length __attribute__((unused)),

              const gfc_array_char *source, const index_type *along,

              const index_type *pncopies,

              GFC_INTEGER_4 source_length __attribute__((unused)))

{

  spread_internal (ret, source, along, pncopies);

}

/* The following are the prototypes for the versions of spread with a

   scalar source.  */

extern void spread_scalar (gfc_array_char *, const char *,

                           const index_type *, const index_type *);

export_proto(spread_scalar);

void

spread_scalar (gfc_array_char *ret, const char *source,

               const index_type *along, const index_type *pncopies)

{

  index_type type_size;

  if (!ret->dtype)

    runtime_error ("return array missing descriptor in spread()");

  type_size = GFC_DTYPE_TYPE_SIZE(ret);

  switch(type_size)

    {

    case GFC_DTYPE_DERIVED_1:

    case GFC_DTYPE_LOGICAL_1:

    case GFC_DTYPE_INTEGER_1:

      spread_scalar_i1 ((gfc_array_i1 *) ret, (GFC_INTEGER_1 *) source,

                        *along, *pncopies);

      return;

    case GFC_DTYPE_LOGICAL_2:

    case GFC_DTYPE_INTEGER_2:

      spread_scalar_i2 ((gfc_array_i2 *) ret, (GFC_INTEGER_2 *) source,

                        *along, *pncopies);

      return;

    case GFC_DTYPE_LOGICAL_4:

    case GFC_DTYPE_INTEGER_4:

      spread_scalar_i4 ((gfc_array_i4 *) ret, (GFC_INTEGER_4 *) source,

                        *along, *pncopies);

      return;

    case GFC_DTYPE_LOGICAL_8:

    case GFC_DTYPE_INTEGER_8:

      spread_scalar_i8 ((gfc_array_i8 *) ret, (GFC_INTEGER_8 *) source,

                        *along, *pncopies);

      return;

#ifdef HAVE_GFC_INTEGER_16

    case GFC_DTYPE_LOGICAL_16:

    case GFC_DTYPE_INTEGER_16:

      spread_scalar_i16 ((gfc_array_i16 *) ret, (GFC_INTEGER_16 *) source,

                        *along, *pncopies);

      return;

#endif

    case GFC_DTYPE_REAL_4:

      spread_scalar_r4 ((gfc_array_r4 *) ret, (GFC_REAL_4 *) source,

                        *along, *pncopies);

      return;

    case GFC_DTYPE_REAL_8:

      spread_scalar_r8 ((gfc_array_r8 *) ret, (GFC_REAL_8 *) source,

                        *along, *pncopies);

      return;

/* FIXME: This here is a hack, which will have to be removed when

   the array descriptor is reworked.  Currently, we don't store the

   kind value for the type, but only the size.  Because on targets with

   __float128, we have sizeof(logn double) == sizeof(__float128),

   we cannot discriminate here and have to fall back to the generic

   handling (which is suboptimal).  */

#if !defined(GFC_REAL_16_IS_FLOAT128)

# ifdef HAVE_GFC_REAL_10

    case GFC_DTYPE_REAL_10:

      spread_scalar_r10 ((gfc_array_r10 *) ret, (GFC_REAL_10 *) source,

                        *along, *pncopies);

      return;

# endif

# ifdef HAVE_GFC_REAL_16

    case GFC_DTYPE_REAL_16:

      spread_scalar_r16 ((gfc_array_r16 *) ret, (GFC_REAL_16 *) source,

                        *along, *pncopies);

      return;

# endif

#endif

    case GFC_DTYPE_COMPLEX_4:

      spread_scalar_c4 ((gfc_array_c4 *) ret, (GFC_COMPLEX_4 *) source,

                        *along, *pncopies);

      return;

    case GFC_DTYPE_COMPLEX_8:

      spread_scalar_c8 ((gfc_array_c8 *) ret, (GFC_COMPLEX_8 *) source,

                        *along, *pncopies);

      return;

/* FIXME: This here is a hack, which will have to be removed when

   the array descriptor is reworked.  Currently, we don't store the

   kind value for the type, but only the size.  Because on targets with

   __float128, we have sizeof(logn double) == sizeof(__float128),

   we cannot discriminate here and have to fall back to the generic

   handling (which is suboptimal).  */

#if !defined(GFC_REAL_16_IS_FLOAT128)

# ifdef HAVE_GFC_COMPLEX_10

    case GFC_DTYPE_COMPLEX_10:

      spread_scalar_c10 ((gfc_array_c10 *) ret, (GFC_COMPLEX_10 *) source,

                        *along, *pncopies);

      return;

# endif

# ifdef HAVE_GFC_COMPLEX_16

    case GFC_DTYPE_COMPLEX_16:

      spread_scalar_c16 ((gfc_array_c16 *) ret, (GFC_COMPLEX_16 *) source,

                        *along, *pncopies);

      return;

# endif

#endif

    case GFC_DTYPE_DERIVED_2:

      if (GFC_UNALIGNED_2(ret->data) || GFC_UNALIGNED_2(source))

        break;

      else

        {

          spread_scalar_i2 ((gfc_array_i2 *) ret, (GFC_INTEGER_2 *) source,

                            *along, *pncopies);

          return;

        }

    case GFC_DTYPE_DERIVED_4:

      if (GFC_UNALIGNED_4(ret->data) || GFC_UNALIGNED_4(source))

        break;

      else

        {

          spread_scalar_i4 ((gfc_array_i4 *) ret, (GFC_INTEGER_4 *) source,

                            *along, *pncopies);

          return;

        }

    case GFC_DTYPE_DERIVED_8:

      if (GFC_UNALIGNED_8(ret->data) || GFC_UNALIGNED_8(source))

        break;

      else

        {

          spread_scalar_i8 ((gfc_array_i8 *) ret, (GFC_INTEGER_8 *) source,

                            *along, *pncopies);

          return;

        }

#ifdef HAVE_GFC_INTEGER_16

    case GFC_DTYPE_DERIVED_16:

      if (GFC_UNALIGNED_16(ret->data) || GFC_UNALIGNED_16(source))

        break;

      else

        {

          spread_scalar_i16 ((gfc_array_i16 *) ret, (GFC_INTEGER_16 *) source,

                             *along, *pncopies);

          return;

        }

#endif

    }

  spread_internal_scalar (ret, source, along, pncopies);

}

extern void spread_char_scalar (gfc_array_char *, GFC_INTEGER_4,

                                const char *, const index_type *,

                                const index_type *, GFC_INTEGER_4);

export_proto(spread_char_scalar);

void

spread_char_scalar (gfc_array_char *ret,

                    GFC_INTEGER_4 ret_length __attribute__((unused)),

                    const char *source, const index_type *along,

                    const index_type *pncopies,

                    GFC_INTEGER_4 source_length __attribute__((unused)))

{

  if (!ret->dtype)

    runtime_error ("return array missing descriptor in spread()");

  spread_internal_scalar (ret, source, along, pncopies);

}

extern void spread_char4_scalar (gfc_array_char *, GFC_INTEGER_4,

                                 const char *, const index_type *,

                                 const index_type *, GFC_INTEGER_4);

export_proto(spread_char4_scalar);

void

spread_char4_scalar (gfc_array_char *ret,

                     GFC_INTEGER_4 ret_length __attribute__((unused)),

                     const char *source, const index_type *along,

                     const index_type *pncopies,

                     GFC_INTEGER_4 source_length __attribute__((unused)))

{

  if (!ret->dtype)

    runtime_error ("return array missing descriptor in spread()");

  spread_internal_scalar (ret, source, along, pncopies);

}