1 /* Implementation of the MINLOC 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_1) && defined (HAVE_GFC_INTEGER_8) 32 33 static inline int 34 compare_fcn (const GFC_UINTEGER_1 *a, const GFC_UINTEGER_1 *b, gfc_charlen_type n) 35 { 36 if (sizeof (GFC_UINTEGER_1) == 1) 37 return memcmp (a, b, n); 38 else 39 return memcmp_char4 (a, b, n); 40 } 41 42 extern GFC_INTEGER_8 minloc2_8_s1 (gfc_array_s1 * const restrict, GFC_LOGICAL_4 back, 43 gfc_charlen_type); 44 export_proto(minloc2_8_s1); 45 46 GFC_INTEGER_8 47 minloc2_8_s1 (gfc_array_s1 * const restrict array, GFC_LOGICAL_4 back, 48 gfc_charlen_type len) 49 { 50 index_type ret; 51 index_type sstride; 52 index_type extent; 53 const GFC_UINTEGER_1 *src; 54 const GFC_UINTEGER_1 *minval; 55 index_type i; 56 57 extent = GFC_DESCRIPTOR_EXTENT(array,0); 58 if (extent <= 0) 59 return 0; 60 61 sstride = GFC_DESCRIPTOR_STRIDE(array,0) * len; 62 63 ret = 1; 64 src = array->base_addr; 65 minval = NULL; 66 for (i=1; i<=extent; i++) 67 { 68 if (minval == NULL || (back ? compare_fcn (src, minval, len) <= 0 : 69 compare_fcn (src, minval, len) < 0)) 70 { 71 ret = i; 72 minval = src; 73 } 74 src += sstride; 75 } 76 return ret; 77 } 78 79 extern GFC_INTEGER_8 mminloc2_8_s1 (gfc_array_s1 * const restrict, 80 gfc_array_l1 *const restrict mask, GFC_LOGICAL_4 back, 81 gfc_charlen_type); 82 export_proto(mminloc2_8_s1); 83 84 GFC_INTEGER_8 85 mminloc2_8_s1 (gfc_array_s1 * const restrict array, 86 gfc_array_l1 * const restrict mask, GFC_LOGICAL_4 back, 87 gfc_charlen_type len) 88 { 89 index_type ret; 90 index_type sstride; 91 index_type extent; 92 const GFC_UINTEGER_1 *src; 93 const GFC_UINTEGER_1 *maxval; 94 index_type i, j; 95 GFC_LOGICAL_1 *mbase; 96 int mask_kind; 97 index_type mstride; 98 99 extent = GFC_DESCRIPTOR_EXTENT(array,0); 100 if (extent <= 0) 101 return 0; 102 103 sstride = GFC_DESCRIPTOR_STRIDE(array,0) * len; 104 105 mask_kind = GFC_DESCRIPTOR_SIZE (mask); 106 mbase = mask->base_addr; 107 108 if (mask_kind == 1 || mask_kind == 2 || mask_kind == 4 || mask_kind == 8 109 #ifdef HAVE_GFC_LOGICAL_16 110 || mask_kind == 16 111 #endif 112 ) 113 mbase = GFOR_POINTER_TO_L1 (mbase, mask_kind); 114 else 115 internal_error (NULL, "Funny sized logical array"); 116 117 mstride = GFC_DESCRIPTOR_STRIDE_BYTES(mask,0); 118 119 /* Search for the first occurrence of a true element in mask. */ 120 for (j=0; j<extent; j++) 121 { 122 if (*mbase) 123 break; 124 mbase += mstride; 125 } 126 127 if (j == extent) 128 return 0; 129 130 ret = j + 1; 131 src = array->base_addr + j * sstride; 132 maxval = src; 133 134 for (i=j+1; i<=extent; i++) 135 { 136 137 if (*mbase && (back ? compare_fcn (src, maxval, len) <= 0 : 138 compare_fcn (src, maxval, len) < 0)) 139 { 140 ret = i; 141 maxval = src; 142 } 143 src += sstride; 144 mbase += mstride; 145 } 146 return ret; 147 } 148 149 extern GFC_INTEGER_8 sminloc2_8_s1 (gfc_array_s1 * const restrict, 150 GFC_LOGICAL_4 *mask, GFC_LOGICAL_4 back, gfc_charlen_type); 151 export_proto(sminloc2_8_s1); 152 153 GFC_INTEGER_8 154 sminloc2_8_s1 (gfc_array_s1 * const restrict array, 155 GFC_LOGICAL_4 *mask, GFC_LOGICAL_4 back, gfc_charlen_type len) 156 { 157 if (mask) 158 return minloc2_8_s1 (array, len, back); 159 else 160 return 0; 161 } 162 163 #endif 164