283 lines
7.2 KiB
C
283 lines
7.2 KiB
C
/* Implementation of the MAXLOC intrinsic
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Copyright 2002 Free Software Foundation, Inc.
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Contributed by Paul Brook <paul@nowt.org>
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This file is part of the GNU Fortran 95 runtime library (libgfor).
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Libgfortran is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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Libgfortran is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with libgfor; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "config.h"
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#include <stdlib.h>
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#include <assert.h>
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#include <float.h>
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#include <limits.h>
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#include "libgfortran.h"
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void
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__maxloc1_4_r8 (gfc_array_i4 * retarray, gfc_array_r8 *array, index_type *pdim)
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{
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index_type count[GFC_MAX_DIMENSIONS - 1];
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index_type extent[GFC_MAX_DIMENSIONS - 1];
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index_type sstride[GFC_MAX_DIMENSIONS - 1];
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index_type dstride[GFC_MAX_DIMENSIONS - 1];
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GFC_REAL_8 *base;
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GFC_INTEGER_4 *dest;
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index_type rank;
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index_type n;
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index_type len;
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index_type delta;
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index_type dim;
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/* Make dim zero based to avoid confusion. */
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dim = (*pdim) - 1;
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rank = GFC_DESCRIPTOR_RANK (array) - 1;
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assert (rank == GFC_DESCRIPTOR_RANK (retarray));
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if (array->dim[0].stride == 0)
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array->dim[0].stride = 1;
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if (retarray->dim[0].stride == 0)
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retarray->dim[0].stride = 1;
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len = array->dim[dim].ubound + 1 - array->dim[dim].lbound;
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delta = array->dim[dim].stride;
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for (n = 0; n < dim; n++)
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{
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sstride[n] = array->dim[n].stride;
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extent[n] = array->dim[n].ubound + 1 - array->dim[n].lbound;
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}
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for (n = dim; n < rank; n++)
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{
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sstride[n] = array->dim[n + 1].stride;
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extent[n] =
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array->dim[n + 1].ubound + 1 - array->dim[n + 1].lbound;
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}
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if (retarray->data == NULL)
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{
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for (n = 0; n < rank; n++)
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{
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retarray->dim[n].lbound = 0;
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retarray->dim[n].ubound = extent[n]-1;
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if (n == 0)
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retarray->dim[n].stride = 1;
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else
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retarray->dim[n].stride = retarray->dim[n-1].stride * extent[n-1];
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}
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retarray->data = internal_malloc (sizeof (GFC_INTEGER_4) *
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(retarray->dim[rank-1].stride * extent[rank-1]));
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retarray->base = 0;
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}
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for (n = 0; n < rank; n++)
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{
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count[n] = 0;
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dstride[n] = retarray->dim[n].stride;
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if (extent[n] <= 0)
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len = 0;
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}
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base = array->data;
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dest = retarray->data;
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while (base)
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{
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GFC_REAL_8 *src;
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GFC_INTEGER_4 result;
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src = base;
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{
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GFC_REAL_8 maxval;
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maxval = -GFC_REAL_8_HUGE;
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result = 1;
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if (len <= 0)
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*dest = 0;
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else
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{
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for (n = 0; n < len; n++, src += delta)
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{
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if (*src > maxval)
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{
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maxval = *src;
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result = (GFC_INTEGER_4)n + 1;
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}
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}
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*dest = result;
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}
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}
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/* Advance to the next element. */
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count[0]++;
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base += sstride[0];
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dest += dstride[0];
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n = 0;
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while (count[n] == extent[n])
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{
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/* When we get to the end of a dimension, reset it and increment
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the next dimension. */
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count[n] = 0;
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/* We could precalculate these products, but this is a less
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frequently used path so proabably not worth it. */
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base -= sstride[n] * extent[n];
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dest -= dstride[n] * extent[n];
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n++;
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if (n == rank)
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{
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/* Break out of the look. */
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base = NULL;
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break;
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}
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else
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{
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count[n]++;
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base += sstride[n];
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dest += dstride[n];
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}
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}
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}
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}
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void
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__mmaxloc1_4_r8 (gfc_array_i4 * retarray, gfc_array_r8 * array, index_type *pdim, gfc_array_l4 * mask)
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{
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index_type count[GFC_MAX_DIMENSIONS - 1];
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index_type extent[GFC_MAX_DIMENSIONS - 1];
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index_type sstride[GFC_MAX_DIMENSIONS - 1];
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index_type dstride[GFC_MAX_DIMENSIONS - 1];
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index_type mstride[GFC_MAX_DIMENSIONS - 1];
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GFC_INTEGER_4 *dest;
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GFC_REAL_8 *base;
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GFC_LOGICAL_4 *mbase;
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int rank;
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int dim;
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index_type n;
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index_type len;
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index_type delta;
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index_type mdelta;
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dim = (*pdim) - 1;
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rank = GFC_DESCRIPTOR_RANK (array) - 1;
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assert (rank == GFC_DESCRIPTOR_RANK (retarray));
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if (array->dim[0].stride == 0)
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array->dim[0].stride = 1;
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if (retarray->dim[0].stride == 0)
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retarray->dim[0].stride = 1;
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len = array->dim[dim].ubound + 1 - array->dim[dim].lbound;
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if (len <= 0)
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return;
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delta = array->dim[dim].stride;
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mdelta = mask->dim[dim].stride;
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for (n = 0; n < dim; n++)
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{
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sstride[n] = array->dim[n].stride;
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mstride[n] = mask->dim[n].stride;
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extent[n] = array->dim[n].ubound + 1 - array->dim[n].lbound;
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}
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for (n = dim; n < rank; n++)
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{
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sstride[n] = array->dim[n + 1].stride;
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mstride[n] = mask->dim[n + 1].stride;
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extent[n] =
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array->dim[n + 1].ubound + 1 - array->dim[n + 1].lbound;
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}
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for (n = 0; n < rank; n++)
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{
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count[n] = 0;
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dstride[n] = retarray->dim[n].stride;
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if (extent[n] <= 0)
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return;
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}
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dest = retarray->data;
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base = array->data;
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mbase = mask->data;
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if (GFC_DESCRIPTOR_SIZE (mask) != 4)
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{
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/* This allows the same loop to be used for all logical types. */
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assert (GFC_DESCRIPTOR_SIZE (mask) == 8);
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for (n = 0; n < rank; n++)
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mstride[n] <<= 1;
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mdelta <<= 1;
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mbase = (GFOR_POINTER_L8_TO_L4 (mbase));
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}
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while (base)
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{
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GFC_REAL_8 *src;
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GFC_LOGICAL_4 *msrc;
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GFC_INTEGER_4 result;
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src = base;
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msrc = mbase;
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{
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GFC_REAL_8 maxval;
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maxval = -GFC_REAL_8_HUGE;
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result = 1;
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if (len <= 0)
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*dest = 0;
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else
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{
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for (n = 0; n < len; n++, src += delta, msrc += mdelta)
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{
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if (*msrc && *src > maxval)
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{
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maxval = *src;
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result = (GFC_INTEGER_4)n + 1;
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}
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}
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*dest = result;
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}
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}
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/* Advance to the next element. */
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count[0]++;
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base += sstride[0];
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mbase += mstride[0];
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dest += dstride[0];
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n = 0;
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while (count[n] == extent[n])
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{
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/* When we get to the end of a dimension, reset it and increment
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the next dimension. */
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count[n] = 0;
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/* We could precalculate these products, but this is a less
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frequently used path so proabably not worth it. */
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base -= sstride[n] * extent[n];
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mbase -= mstride[n] * extent[n];
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dest -= dstride[n] * extent[n];
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n++;
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if (n == rank)
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{
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/* Break out of the look. */
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base = NULL;
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break;
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}
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else
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{
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count[n]++;
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base += sstride[n];
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mbase += mstride[n];
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dest += dstride[n];
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}
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}
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}
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}
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