1 /* Implementation of the MAXLOC intrinsic 2 Copyright (C) 2017-2020 Free Software Foundation, Inc. 3 Contributed by Thomas Koenig 4 5 This file is part of the GNU Fortran runtime library (libgfortran). 6 7 Libgfortran is free software; you can redistribute it and/or 8 modify it under the terms of the GNU General Public 9 License as published by the Free Software Foundation; either 10 version 3 of the License, or (at your option) any later version. 11 12 Libgfortran is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 Under Section 7 of GPL version 3, you are granted additional 18 permissions described in the GCC Runtime Library Exception, version 19 3.1, as published by the Free Software Foundation. 20 21 You should have received a copy of the GNU General Public License and 22 a copy of the GCC Runtime Library Exception along with this program; 23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 24 <http://www.gnu.org/licenses/>. */ 25 26 #include "libgfortran.h" 27 #include <stdlib.h> 28 #include <string.h> 29 #include <assert.h> 30 31 #if defined (HAVE_GFC_UINTEGER_4) && defined (HAVE_GFC_INTEGER_4) 32 33 static inline int 34 compare_fcn (const GFC_UINTEGER_4 *a, const GFC_UINTEGER_4 *b, gfc_charlen_type n) 35 { 36 if (sizeof (GFC_UINTEGER_4) == 1) 37 return memcmp (a, b, n); 38 else 39 return memcmp_char4 (a, b, n); 40 } 41 42 extern GFC_INTEGER_4 maxloc2_4_s4 (gfc_array_s4 * const restrict, GFC_LOGICAL_4 back, 43 gfc_charlen_type); 44 export_proto(maxloc2_4_s4); 45 46 GFC_INTEGER_4 47 maxloc2_4_s4 (gfc_array_s4 * const restrict array, GFC_LOGICAL_4 back, gfc_charlen_type len) 48 { 49 index_type ret; 50 index_type sstride; 51 index_type extent; 52 const GFC_UINTEGER_4 *src; 53 const GFC_UINTEGER_4 *maxval; 54 index_type i; 55 56 extent = GFC_DESCRIPTOR_EXTENT(array,0); 57 if (extent <= 0) 58 return 0; 59 60 sstride = GFC_DESCRIPTOR_STRIDE(array,0) * len; 61 62 ret = 1; 63 src = array->base_addr; 64 maxval = NULL; 65 for (i=1; i<=extent; i++) 66 { 67 if (maxval == NULL || (back ? compare_fcn (src, maxval, len) >= 0 : 68 compare_fcn (src, maxval, len) > 0)) 69 { 70 ret = i; 71 maxval = src; 72 } 73 src += sstride; 74 } 75 return ret; 76 } 77 78 extern GFC_INTEGER_4 mmaxloc2_4_s4 (gfc_array_s4 * const restrict, 79 gfc_array_l1 *const restrict mask, GFC_LOGICAL_4 back, 80 gfc_charlen_type); 81 export_proto(mmaxloc2_4_s4); 82 83 GFC_INTEGER_4 84 mmaxloc2_4_s4 (gfc_array_s4 * const restrict array, 85 gfc_array_l1 * const restrict mask, GFC_LOGICAL_4 back, 86 gfc_charlen_type len) 87 { 88 index_type ret; 89 index_type sstride; 90 index_type extent; 91 const GFC_UINTEGER_4 *src; 92 const GFC_UINTEGER_4 *maxval; 93 index_type i, j; 94 GFC_LOGICAL_1 *mbase; 95 int mask_kind; 96 index_type mstride; 97 98 extent = GFC_DESCRIPTOR_EXTENT(array,0); 99 if (extent <= 0) 100 return 0; 101 102 sstride = GFC_DESCRIPTOR_STRIDE(array,0) * len; 103 104 mask_kind = GFC_DESCRIPTOR_SIZE (mask); 105 mbase = mask->base_addr; 106 107 if (mask_kind == 1 || mask_kind == 2 || mask_kind == 4 || mask_kind == 8 108 #ifdef HAVE_GFC_LOGICAL_16 109 || mask_kind == 16 110 #endif 111 ) 112 mbase = GFOR_POINTER_TO_L1 (mbase, mask_kind); 113 else 114 internal_error (NULL, "Funny sized logical array"); 115 116 mstride = GFC_DESCRIPTOR_STRIDE_BYTES(mask,0); 117 118 /* Search for the first occurrence of a true element in mask. */ 119 for (j=0; j<extent; j++) 120 { 121 if (*mbase) 122 break; 123 mbase += mstride; 124 } 125 126 if (j == extent) 127 return 0; 128 129 ret = j + 1; 130 src = array->base_addr + j * sstride; 131 maxval = src; 132 133 for (i=j+1; i<=extent; i++) 134 { 135 if (*mbase && (back ? compare_fcn (src, maxval, len) >= 0 : 136 compare_fcn (src, maxval, len) > 0)) 137 { 138 ret = i; 139 maxval = src; 140 } 141 src += sstride; 142 mbase += mstride; 143 } 144 return ret; 145 } 146 147 extern GFC_INTEGER_4 smaxloc2_4_s4 (gfc_array_s4 * const restrict, 148 GFC_LOGICAL_4 *mask, GFC_LOGICAL_4 back, gfc_charlen_type); 149 export_proto(smaxloc2_4_s4); 150 151 GFC_INTEGER_4 152 smaxloc2_4_s4 (gfc_array_s4 * const restrict array, 153 GFC_LOGICAL_4 *mask, GFC_LOGICAL_4 back, gfc_charlen_type len) 154 { 155 if (mask) 156 return maxloc2_4_s4 (array, len, back); 157 else 158 return 0; 159 } 160 161 #endif 162