| /* Implementation of the MAXLOC intrinsic |
| Copyright (C) 2017-2019 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_1) && defined (HAVE_GFC_INTEGER_8) |
| |
| static inline int |
| compare_fcn (const GFC_UINTEGER_1 *a, const GFC_UINTEGER_1 *b, gfc_charlen_type n) |
| { |
| if (sizeof (GFC_UINTEGER_1) == 1) |
| return memcmp (a, b, n); |
| else |
| return memcmp_char4 (a, b, n); |
| } |
| |
| extern GFC_INTEGER_8 maxloc2_8_s1 (gfc_array_s1 * const restrict, GFC_LOGICAL_4 back, |
| gfc_charlen_type); |
| export_proto(maxloc2_8_s1); |
| |
| GFC_INTEGER_8 |
| maxloc2_8_s1 (gfc_array_s1 * const restrict array, GFC_LOGICAL_4 back, gfc_charlen_type len) |
| { |
| index_type ret; |
| index_type sstride; |
| index_type extent; |
| const GFC_UINTEGER_1 *src; |
| const GFC_UINTEGER_1 *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_8 mmaxloc2_8_s1 (gfc_array_s1 * const restrict, |
| gfc_array_l1 *const restrict mask, GFC_LOGICAL_4 back, |
| gfc_charlen_type); |
| export_proto(mmaxloc2_8_s1); |
| |
| GFC_INTEGER_8 |
| mmaxloc2_8_s1 (gfc_array_s1 * 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_1 *src; |
| const GFC_UINTEGER_1 *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_8 smaxloc2_8_s1 (gfc_array_s1 * const restrict, |
| GFC_LOGICAL_4 *mask, GFC_LOGICAL_4 back, gfc_charlen_type); |
| export_proto(smaxloc2_8_s1); |
| |
| GFC_INTEGER_8 |
| smaxloc2_8_s1 (gfc_array_s1 * const restrict array, |
| GFC_LOGICAL_4 *mask, GFC_LOGICAL_4 back, gfc_charlen_type len) |
| { |
| if (mask) |
| return maxloc2_8_s1 (array, len, back); |
| else |
| return 0; |
| } |
| |
| #endif |