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/* Implementation of the MINLOC intrinsic

   Copyright 2002 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.)

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.

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 <float.h>

#include <limits.h>

#include "libgfortran.h"

#if defined (HAVE_GFC_REAL_8) && defined (HAVE_GFC_INTEGER_4)

extern void minloc1_4_r8 (gfc_array_i4 *, gfc_array_r8 *, index_type *);

export_proto(minloc1_4_r8);

void

minloc1_4_r8 (gfc_array_i4 *retarray, gfc_array_r8 *array, index_type *pdim)

{

  index_type count[GFC_MAX_DIMENSIONS];

  index_type extent[GFC_MAX_DIMENSIONS];

  index_type sstride[GFC_MAX_DIMENSIONS];

  index_type dstride[GFC_MAX_DIMENSIONS];

  GFC_REAL_8 *base;

  GFC_INTEGER_4 *dest;

  index_type rank;

  index_type n;

  index_type len;

  index_type delta;

  index_type dim;

  /* Make dim zero based to avoid confusion.  */

  dim = (*pdim) - 1;

  rank = GFC_DESCRIPTOR_RANK (array) - 1;

  /* TODO:  It should be a front end job to correctly set the strides.  */

  if (array->dim[0].stride == 0)

    array->dim[0].stride = 1;

  len = array->dim[dim].ubound + 1 - array->dim[dim].lbound;

  delta = array->dim[dim].stride;

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

    {

      sstride[n] = array->dim[n].stride;

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

    }

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

    {

      sstride[n] = array->dim[n + 1].stride;

      extent[n] =

        array->dim[n + 1].ubound + 1 - array->dim[n + 1].lbound;

    }

  if (retarray->data == NULL)

    {

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

        {

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

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

          if (n == 0)

            retarray->dim[n].stride = 1;

          else

            retarray->dim[n].stride = retarray->dim[n-1].stride * extent[n-1];

        }

      retarray->data

         = internal_malloc_size (sizeof (GFC_INTEGER_4)

                                 * retarray->dim[rank-1].stride

                                 * extent[rank-1]);

      retarray->offset = 0;

      retarray->dtype = (array->dtype & ~GFC_DTYPE_RANK_MASK) | rank;

    }

  else

    {

      if (retarray->dim[0].stride == 0)

        retarray->dim[0].stride = 1;

      if (rank != GFC_DESCRIPTOR_RANK (retarray))

        runtime_error ("rank of return array incorrect");

    }

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

    {

      count[n] = 0;

      dstride[n] = retarray->dim[n].stride;

      if (extent[n] <= 0)

        len = 0;

    }

  base = array->data;

  dest = retarray->data;

  while (base)

    {

      GFC_REAL_8 *src;

      GFC_INTEGER_4 result;

      src = base;

      {

  GFC_REAL_8 minval;

  minval = GFC_REAL_8_HUGE;

  result = 0;

        if (len <= 0)

          *dest = 0;

        else

          {

            for (n = 0; n < len; n++, src += delta)

              {

  if (*src < minval || !result)

    {

      minval = *src;

      result = (GFC_INTEGER_4)n + 1;

    }

          }

            *dest = result;

          }

      }

      /* Advance to the next element.  */

      count[0]++;

      base += sstride[0];

      dest += dstride[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.  */

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

          dest -= dstride[n] * extent[n];

          n++;

          if (n == rank)

            {

              /* Break out of the look.  */

              base = NULL;

              break;

            }

          else

            {

              count[n]++;

              base += sstride[n];

              dest += dstride[n];

            }

        }

    }

}

extern void mminloc1_4_r8 (gfc_array_i4 *, gfc_array_r8 *, index_type *,

                                               gfc_array_l4 *);

export_proto(mminloc1_4_r8);

void

mminloc1_4_r8 (gfc_array_i4 * retarray, gfc_array_r8 * array,

                                  index_type *pdim, gfc_array_l4 * mask)

{

  index_type count[GFC_MAX_DIMENSIONS];

  index_type extent[GFC_MAX_DIMENSIONS];

  index_type sstride[GFC_MAX_DIMENSIONS];

  index_type dstride[GFC_MAX_DIMENSIONS];

  index_type mstride[GFC_MAX_DIMENSIONS];

  GFC_INTEGER_4 *dest;

  GFC_REAL_8 *base;

  GFC_LOGICAL_4 *mbase;

  int rank;

  int dim;

  index_type n;

  index_type len;

  index_type delta;

  index_type mdelta;

  dim = (*pdim) - 1;

  rank = GFC_DESCRIPTOR_RANK (array) - 1;

  /* TODO:  It should be a front end job to correctly set the strides.  */

  if (array->dim[0].stride == 0)

    array->dim[0].stride = 1;

  if (mask->dim[0].stride == 0)

    mask->dim[0].stride = 1;

  len = array->dim[dim].ubound + 1 - array->dim[dim].lbound;

  if (len <= 0)

    return;

  delta = array->dim[dim].stride;

  mdelta = mask->dim[dim].stride;

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

    {

      sstride[n] = array->dim[n].stride;

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

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

    }

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

    {

      sstride[n] = array->dim[n + 1].stride;

      mstride[n] = mask->dim[n + 1].stride;

      extent[n] =

        array->dim[n + 1].ubound + 1 - array->dim[n + 1].lbound;

    }

  if (retarray->data == NULL)

    {

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

        {

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

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

          if (n == 0)

            retarray->dim[n].stride = 1;

          else

            retarray->dim[n].stride = retarray->dim[n-1].stride * extent[n-1];

        }

      retarray->data

         = internal_malloc_size (sizeof (GFC_INTEGER_4)

                                 * retarray->dim[rank-1].stride

                                 * extent[rank-1]);

      retarray->offset = 0;

      retarray->dtype = (array->dtype & ~GFC_DTYPE_RANK_MASK) | rank;

    }

  else

    {

      if (retarray->dim[0].stride == 0)

        retarray->dim[0].stride = 1;

      if (rank != GFC_DESCRIPTOR_RANK (retarray))

        runtime_error ("rank of return array incorrect");

    }

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

    {

      count[n] = 0;

      dstride[n] = retarray->dim[n].stride;

      if (extent[n] <= 0)

        return;

    }

  dest = retarray->data;

  base = array->data;

  mbase = mask->data;

  if (GFC_DESCRIPTOR_SIZE (mask) != 4)

    {

      /* This allows the same loop to be used for all logical types.  */

      assert (GFC_DESCRIPTOR_SIZE (mask) == 8);

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

        mstride[n] <<= 1;

      mdelta <<= 1;

      mbase = (GFOR_POINTER_L8_TO_L4 (mbase));

    }

  while (base)

    {

      GFC_REAL_8 *src;

      GFC_LOGICAL_4 *msrc;

      GFC_INTEGER_4 result;

      src = base;

      msrc = mbase;

      {

  GFC_REAL_8 minval;

  minval = GFC_REAL_8_HUGE;

  result = 0;

        if (len <= 0)

          *dest = 0;

        else

          {

            for (n = 0; n < len; n++, src += delta, msrc += mdelta)

              {

  if (*msrc && (*src < minval || !result))

    {

      minval = *src;

      result = (GFC_INTEGER_4)n + 1;

    }

              }

            *dest = result;

          }

      }

      /* Advance to the next element.  */

      count[0]++;

      base += sstride[0];

      mbase += mstride[0];

      dest += dstride[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.  */

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

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

          dest -= dstride[n] * extent[n];

          n++;

          if (n == rank)

            {

              /* Break out of the look.  */

              base = NULL;

              break;

            }

          else

            {

              count[n]++;

              base += sstride[n];

              mbase += mstride[n];

              dest += dstride[n];

            }

        }

    }

}

extern void sminloc1_4_r8 (gfc_array_i4 * const restrict,

        gfc_array_r8 * const restrict, const index_type * const restrict,

        GFC_LOGICAL_4 *);

export_proto(sminloc1_4_r8);

void

sminloc1_4_r8 (gfc_array_i4 * const restrict retarray,

        gfc_array_r8 * const restrict array,

        const index_type * const restrict pdim,

        GFC_LOGICAL_4 * mask)

{

  index_type rank;

  index_type n;

  index_type dstride;

  GFC_INTEGER_4 *dest;

  if (*mask)

    {

      minloc1_4_r8 (retarray, array, pdim);

      return;

    }

    rank = GFC_DESCRIPTOR_RANK (array);

  if (rank <= 0)

    runtime_error ("Rank of array needs to be > 0");

  if (retarray->data == NULL)

    {

      retarray->dim[0].lbound = 0;

      retarray->dim[0].ubound = rank-1;

      retarray->dim[0].stride = 1;

      retarray->dtype = (retarray->dtype & ~GFC_DTYPE_RANK_MASK) | 1;

      retarray->offset = 0;

      retarray->data = internal_malloc_size (sizeof (GFC_INTEGER_4) * rank);

    }

  else

    {

      if (GFC_DESCRIPTOR_RANK (retarray) != 1)

        runtime_error ("rank of return array does not equal 1");

      if (retarray->dim[0].ubound + 1 - retarray->dim[0].lbound != rank)

        runtime_error ("dimension of return array incorrect");

      if (retarray->dim[0].stride == 0)

        retarray->dim[0].stride = 1;

    }

    dstride = retarray->dim[0].stride;

    dest = retarray->data;

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

      dest[n * dstride] = 0 ;

}

#endif