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/* Implementation of the MAXLOC intrinsic
   Copyright 2002, 2007, 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.
 
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.
 
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 <limits.h>
 
 
#if defined (HAVE_GFC_INTEGER_1) && defined (HAVE_GFC_INTEGER_4)
 
 
extern void maxloc0_4_i1 (gfc_array_i4 * const restrict retarray, 
	gfc_array_i1 * const restrict array);
export_proto(maxloc0_4_i1);
 
void
maxloc0_4_i1 (gfc_array_i4 * const restrict retarray, 
	gfc_array_i1 * const restrict array)
{
  index_type count[GFC_MAX_DIMENSIONS];
  index_type extent[GFC_MAX_DIMENSIONS];
  index_type sstride[GFC_MAX_DIMENSIONS];
  index_type dstride;
  const GFC_INTEGER_1 *base;
  GFC_INTEGER_4 * restrict dest;
  index_type rank;
  index_type n;
 
  rank = GFC_DESCRIPTOR_RANK (array);
  if (rank <= 0)
    runtime_error ("Rank of array needs to be > 0");
 
  if (retarray->data == NULL)
    {
      GFC_DIMENSION_SET(retarray->dim[0], 0, rank-1, 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 (unlikely (compile_options.bounds_check))
	bounds_iforeach_return ((array_t *) retarray, (array_t *) array,
				"MAXLOC");
    }
 
  dstride = GFC_DESCRIPTOR_STRIDE(retarray,0);
  dest = retarray->data;
  for (n = 0; n < rank; n++)
    {
      sstride[n] = GFC_DESCRIPTOR_STRIDE(array,n);
      extent[n] = GFC_DESCRIPTOR_EXTENT(array,n);
      count[n] = 0;
      if (extent[n] <= 0)
	{
	  /* Set the return value.  */
	  for (n = 0; n < rank; n++)
	    dest[n * dstride] = 0;
	  return;
	}
    }
 
  base = array->data;
 
  /* Initialize the return value.  */
  for (n = 0; n < rank; n++)
    dest[n * dstride] = 1;
  {
 
    GFC_INTEGER_1 maxval;
#if defined(GFC_INTEGER_1_QUIET_NAN)
    int fast = 0;
#endif
 
#if defined(GFC_INTEGER_1_INFINITY)
    maxval = -GFC_INTEGER_1_INFINITY;
#else
    maxval = (-GFC_INTEGER_1_HUGE-1);
#endif
  while (base)
    {
      do
	{
	  /* Implementation start.  */
 
#if defined(GFC_INTEGER_1_QUIET_NAN)
	}
      while (0);
      if (unlikely (!fast))
	{
	  do
	    {
	      if (*base >= maxval)
		{
		  fast = 1;
		  maxval = *base;
		  for (n = 0; n < rank; n++)
		    dest[n * dstride] = count[n] + 1;
		  break;
		}
	      base += sstride[0];
	    }
	  while (++count[0] != extent[0]);
	  if (likely (fast))
	    continue;
	}
      else do
	{
#endif
	  if (*base > maxval)
	    {
	      maxval = *base;
	      for (n = 0; n < rank; n++)
		dest[n * dstride] = count[n] + 1;
	    }
	  /* Implementation end.  */
	  /* Advance to the next element.  */
	  base += sstride[0];
	}
      while (++count[0] != extent[0]);
      n = 0;
      do
	{
	  /* 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.  */
	  base -= sstride[n] * extent[n];
	  n++;
	  if (n == rank)
	    {
	      /* Break out of the loop.  */
	      base = NULL;
	      break;
	    }
	  else
	    {
	      count[n]++;
	      base += sstride[n];
	    }
	}
      while (count[n] == extent[n]);
    }
  }
}
 
 
extern void mmaxloc0_4_i1 (gfc_array_i4 * const restrict, 
	gfc_array_i1 * const restrict, gfc_array_l1 * const restrict);
export_proto(mmaxloc0_4_i1);
 
void
mmaxloc0_4_i1 (gfc_array_i4 * const restrict retarray, 
	gfc_array_i1 * const restrict array,
	gfc_array_l1 * const restrict mask)
{
  index_type count[GFC_MAX_DIMENSIONS];
  index_type extent[GFC_MAX_DIMENSIONS];
  index_type sstride[GFC_MAX_DIMENSIONS];
  index_type mstride[GFC_MAX_DIMENSIONS];
  index_type dstride;
  GFC_INTEGER_4 *dest;
  const GFC_INTEGER_1 *base;
  GFC_LOGICAL_1 *mbase;
  int rank;
  index_type n;
  int mask_kind;
 
  rank = GFC_DESCRIPTOR_RANK (array);
  if (rank <= 0)
    runtime_error ("Rank of array needs to be > 0");
 
  if (retarray->data == NULL)
    {
      GFC_DIMENSION_SET(retarray->dim[0], 0, rank - 1, 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 (unlikely (compile_options.bounds_check))
	{
 
	  bounds_iforeach_return ((array_t *) retarray, (array_t *) array,
				  "MAXLOC");
	  bounds_equal_extents ((array_t *) mask, (array_t *) array,
				  "MASK argument", "MAXLOC");
	}
    }
 
  mask_kind = GFC_DESCRIPTOR_SIZE (mask);
 
  mbase = mask->data;
 
  if (mask_kind == 1 || mask_kind == 2 || mask_kind == 4 || mask_kind == 8
#ifdef HAVE_GFC_LOGICAL_16
      || mask_kind == 16
#endif
      )
    mbase = GFOR_POINTER_TO_L1 (mbase, mask_kind);
  else
    runtime_error ("Funny sized logical array");
 
  dstride = GFC_DESCRIPTOR_STRIDE(retarray,0);
  dest = retarray->data;
  for (n = 0; n < rank; n++)
    {
      sstride[n] = GFC_DESCRIPTOR_STRIDE(array,n);
      mstride[n] = GFC_DESCRIPTOR_STRIDE_BYTES(mask,n);
      extent[n] = GFC_DESCRIPTOR_EXTENT(array,n);
      count[n] = 0;
      if (extent[n] <= 0)
	{
	  /* Set the return value.  */
	  for (n = 0; n < rank; n++)
	    dest[n * dstride] = 0;
	  return;
	}
    }
 
  base = array->data;
 
  /* Initialize the return value.  */
  for (n = 0; n < rank; n++)
    dest[n * dstride] = 0;
  {
 
  GFC_INTEGER_1 maxval;
   int fast = 0;
 
#if defined(GFC_INTEGER_1_INFINITY)
    maxval = -GFC_INTEGER_1_INFINITY;
#else
    maxval = (-GFC_INTEGER_1_HUGE-1);
#endif
  while (base)
    {
      do
	{
	  /* Implementation start.  */
 
	}
      while (0);
      if (unlikely (!fast))
	{
	  do
	    {
	      if (*mbase)
		{
#if defined(GFC_INTEGER_1_QUIET_NAN)
		  if (unlikely (dest[0] == 0))
		    for (n = 0; n < rank; n++)
		      dest[n * dstride] = count[n] + 1;
		  if (*base >= maxval)
#endif
		    {
		      fast = 1;
		      maxval = *base;
		      for (n = 0; n < rank; n++)
			dest[n * dstride] = count[n] + 1;
		      break;
		    }
		}
	      base += sstride[0];
	      mbase += mstride[0];
	    }
	  while (++count[0] != extent[0]);
	  if (likely (fast))
	    continue;
	}
      else do
	{
	  if (*mbase && *base > maxval)
	    {
	      maxval = *base;
	      for (n = 0; n < rank; n++)
		dest[n * dstride] = count[n] + 1;
	    }
	  /* Implementation end.  */
	  /* Advance to the next element.  */
	  base += sstride[0];
	  mbase += mstride[0];
	}
      while (++count[0] != extent[0]);
      n = 0;
      do
	{
	  /* 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.  */
	  base -= sstride[n] * extent[n];
	  mbase -= mstride[n] * extent[n];
	  n++;
	  if (n == rank)
	    {
	      /* Break out of the loop.  */
	      base = NULL;
	      break;
	    }
	  else
	    {
	      count[n]++;
	      base += sstride[n];
	      mbase += mstride[n];
	    }
	}
      while (count[n] == extent[n]);
    }
  }
}
 
 
extern void smaxloc0_4_i1 (gfc_array_i4 * const restrict, 
	gfc_array_i1 * const restrict, GFC_LOGICAL_4 *);
export_proto(smaxloc0_4_i1);
 
void
smaxloc0_4_i1 (gfc_array_i4 * const restrict retarray, 
	gfc_array_i1 * const restrict array,
	GFC_LOGICAL_4 * mask)
{
  index_type rank;
  index_type dstride;
  index_type n;
  GFC_INTEGER_4 *dest;
 
  if (*mask)
    {
      maxloc0_4_i1 (retarray, array);
      return;
    }
 
  rank = GFC_DESCRIPTOR_RANK (array);
 
  if (rank <= 0)
    runtime_error ("Rank of array needs to be > 0");
 
  if (retarray->data == NULL)
    {
      GFC_DIMENSION_SET(retarray->dim[0], 0, rank-1, 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 (unlikely (compile_options.bounds_check))
    {
       bounds_iforeach_return ((array_t *) retarray, (array_t *) array,
			       "MAXLOC");
    }
 
  dstride = GFC_DESCRIPTOR_STRIDE(retarray,0);
  dest = retarray->data;
  for (n = 0; n<rank; n++)
    dest[n * dstride] = 0 ;
}
#endif