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/* Implementation of the MAXLOC intrinsic
Copyright (C) 2017-2022 Free Software Foundation, Inc.
Contributed by Thomas Koenig
This file is part of the GNU Fortran 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 <string.h>
#include <assert.h>
#if defined (HAVE_GFC_UINTEGER_4) && defined (HAVE_GFC_INTEGER_4)
static inline int
compare_fcn (const GFC_UINTEGER_4 *a, const GFC_UINTEGER_4 *b, gfc_charlen_type n)
{
if (sizeof (GFC_UINTEGER_4) == 1)
return memcmp (a, b, n);
else
return memcmp_char4 (a, b, n);
}
extern GFC_INTEGER_4 maxloc2_4_s4 (gfc_array_s4 * const restrict, GFC_LOGICAL_4 back,
gfc_charlen_type);
export_proto(maxloc2_4_s4);
GFC_INTEGER_4
maxloc2_4_s4 (gfc_array_s4 * const restrict array, GFC_LOGICAL_4 back, gfc_charlen_type len)
{
index_type ret;
index_type sstride;
index_type extent;
const GFC_UINTEGER_4 *src;
const GFC_UINTEGER_4 *maxval;
index_type i;
extent = GFC_DESCRIPTOR_EXTENT(array,0);
if (extent <= 0)
return 0;
sstride = GFC_DESCRIPTOR_STRIDE(array,0) * len;
ret = 1;
src = array->base_addr;
maxval = NULL;
for (i=1; i<=extent; i++)
{
if (maxval == NULL || (back ? compare_fcn (src, maxval, len) >= 0 :
compare_fcn (src, maxval, len) > 0))
{
ret = i;
maxval = src;
}
src += sstride;
}
return ret;
}
extern GFC_INTEGER_4 mmaxloc2_4_s4 (gfc_array_s4 * const restrict,
gfc_array_l1 *const restrict mask, GFC_LOGICAL_4 back,
gfc_charlen_type);
export_proto(mmaxloc2_4_s4);
GFC_INTEGER_4
mmaxloc2_4_s4 (gfc_array_s4 * const restrict array,
gfc_array_l1 * const restrict mask, GFC_LOGICAL_4 back,
gfc_charlen_type len)
{
index_type ret;
index_type sstride;
index_type extent;
const GFC_UINTEGER_4 *src;
const GFC_UINTEGER_4 *maxval;
index_type i, j;
GFC_LOGICAL_1 *mbase;
int mask_kind;
index_type mstride;
extent = GFC_DESCRIPTOR_EXTENT(array,0);
if (extent <= 0)
return 0;
sstride = GFC_DESCRIPTOR_STRIDE(array,0) * len;
mask_kind = GFC_DESCRIPTOR_SIZE (mask);
mbase = mask->base_addr;
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
internal_error (NULL, "Funny sized logical array");
mstride = GFC_DESCRIPTOR_STRIDE_BYTES(mask,0);
/* Search for the first occurrence of a true element in mask. */
for (j=0; j<extent; j++)
{
if (*mbase)
break;
mbase += mstride;
}
if (j == extent)
return 0;
ret = j + 1;
src = array->base_addr + j * sstride;
maxval = src;
for (i=j+1; i<=extent; i++)
{
if (*mbase && (back ? compare_fcn (src, maxval, len) >= 0 :
compare_fcn (src, maxval, len) > 0))
{
ret = i;
maxval = src;
}
src += sstride;
mbase += mstride;
}
return ret;
}
extern GFC_INTEGER_4 smaxloc2_4_s4 (gfc_array_s4 * const restrict,
GFC_LOGICAL_4 *mask, GFC_LOGICAL_4 back, gfc_charlen_type);
export_proto(smaxloc2_4_s4);
GFC_INTEGER_4
smaxloc2_4_s4 (gfc_array_s4 * const restrict array,
GFC_LOGICAL_4 *mask, GFC_LOGICAL_4 back, gfc_charlen_type len)
{
if (mask)
return maxloc2_4_s4 (array, len, back);
else
return 0;
}
#endif
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