156 lines
3.9 KiB
C
156 lines
3.9 KiB
C
/* Implementation of the MINLOC intrinsic
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Copyright (C) 2017-2018 Free Software Foundation, Inc.
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Contributed by Thomas Koenig
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This file is part of the GNU Fortran runtime library (libgfortran).
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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 General Public
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License as published by the Free Software Foundation; either
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version 3 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 General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "libgfortran.h"
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#include <stdlib.h>
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#include <string.h>
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#if defined (HAVE_GFC_INTEGER_1) && defined (HAVE_GFC_INTEGER_8)
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static inline int
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compare_fcn (const GFC_INTEGER_1 *a, const GFC_INTEGER_1 *b, gfc_charlen_type n)
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{
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if (sizeof (GFC_INTEGER_1) == 1)
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return memcmp (a, b, n);
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else
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return memcmp_char4 (a, b, n);
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}
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extern GFC_INTEGER_8 minloc2_8_s1 (gfc_array_s1 * const restrict, gfc_charlen_type);
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export_proto(minloc2_8_s1);
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GFC_INTEGER_8
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minloc2_8_s1 (gfc_array_s1 * const restrict array, gfc_charlen_type len)
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{
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index_type ret;
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index_type sstride;
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index_type extent;
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const GFC_INTEGER_1 *src;
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const GFC_INTEGER_1 *maxval;
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index_type i;
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extent = GFC_DESCRIPTOR_EXTENT(array,0);
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if (extent <= 0)
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return 0;
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sstride = GFC_DESCRIPTOR_STRIDE(array,0) * len;
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ret = 1;
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src = array->base_addr;
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maxval = src;
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for (i=2; i<=extent; i++)
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{
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src += sstride;
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if (compare_fcn (src, maxval, len) < 0)
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{
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ret = i;
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maxval = src;
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}
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}
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return ret;
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}
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extern GFC_INTEGER_8 mminloc2_8_s1 (gfc_array_s1 * const restrict,
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gfc_array_l1 *const restrict mask, gfc_charlen_type);
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export_proto(mminloc2_8_s1);
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GFC_INTEGER_8
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mminloc2_8_s1 (gfc_array_s1 * const restrict array,
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gfc_array_l1 * const restrict mask, gfc_charlen_type len)
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{
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index_type ret;
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index_type sstride;
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index_type extent;
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const GFC_INTEGER_1 *src;
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const GFC_INTEGER_1 *maxval;
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index_type i, j;
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GFC_LOGICAL_1 *mbase;
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int mask_kind;
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index_type mstride;
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extent = GFC_DESCRIPTOR_EXTENT(array,0);
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if (extent <= 0)
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return 0;
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sstride = GFC_DESCRIPTOR_STRIDE(array,0) * len;
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mask_kind = GFC_DESCRIPTOR_SIZE (mask);
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mbase = mask->base_addr;
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if (mask_kind == 1 || mask_kind == 2 || mask_kind == 4 || mask_kind == 8
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#ifdef HAVE_GFC_LOGICAL_16
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|| mask_kind == 16
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#endif
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)
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mbase = GFOR_POINTER_TO_L1 (mbase, mask_kind);
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else
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internal_error (NULL, "Funny sized logical array");
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mstride = GFC_DESCRIPTOR_STRIDE_BYTES(mask,0);
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/* Search for the first occurrence of a true element in mask. */
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for (j=0; j<extent; j++)
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{
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if (*mbase)
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break;
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mbase += mstride;
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}
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if (j == extent)
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return 0;
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ret = j + 1;
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src = array->base_addr + j * sstride;
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maxval = src;
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for (i=j+1; i<=extent; i++)
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{
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if (*mbase && compare_fcn (src, maxval, len) < 0)
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{
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ret = i;
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maxval = src;
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}
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src += sstride;
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mbase += mstride;
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}
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return ret;
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}
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extern GFC_INTEGER_8 sminloc2_8_s1 (gfc_array_s1 * const restrict,
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GFC_LOGICAL_4 *mask, gfc_charlen_type);
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export_proto(sminloc2_8_s1);
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GFC_INTEGER_8
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sminloc2_8_s1 (gfc_array_s1 * const restrict array,
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GFC_LOGICAL_4 *mask, gfc_charlen_type len)
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{
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if (mask)
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return minloc2_8_s1 (array, len);
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else
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return 0;
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}
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#endif
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