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131
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1 /* Implementation of the MAXLOC intrinsic
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145
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2 Copyright (C) 2017-2020 Free Software Foundation, Inc.
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131
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3 Contributed by Thomas Koenig
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4
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5 This file is part of the GNU Fortran runtime library (libgfortran).
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6
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7 Libgfortran is free software; you can redistribute it and/or
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8 modify it under the terms of the GNU General Public
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9 License as published by the Free Software Foundation; either
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10 version 3 of the License, or (at your option) any later version.
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11
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12 Libgfortran is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License for more details.
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16
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17 Under Section 7 of GPL version 3, you are granted additional
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18 permissions described in the GCC Runtime Library Exception, version
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19 3.1, as published by the Free Software Foundation.
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20
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21 You should have received a copy of the GNU General Public License and
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22 a copy of the GCC Runtime Library Exception along with this program;
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23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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24 <http://www.gnu.org/licenses/>. */
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25
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26 #include "libgfortran.h"
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27 #include <stdlib.h>
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28 #include <string.h>
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29 #include <assert.h>
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30
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31 #if defined (HAVE_GFC_UINTEGER_4) && defined (HAVE_GFC_INTEGER_8)
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131
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32
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33 static inline int
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34 compare_fcn (const GFC_UINTEGER_4 *a, const GFC_UINTEGER_4 *b, gfc_charlen_type n)
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131
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35 {
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36 if (sizeof (GFC_UINTEGER_4) == 1)
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131
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37 return memcmp (a, b, n);
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38 else
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39 return memcmp_char4 (a, b, n);
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40 }
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41
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42 extern GFC_INTEGER_8 maxloc2_8_s4 (gfc_array_s4 * const restrict, GFC_LOGICAL_4 back,
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43 gfc_charlen_type);
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44 export_proto(maxloc2_8_s4);
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45
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46 GFC_INTEGER_8
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47 maxloc2_8_s4 (gfc_array_s4 * const restrict array, GFC_LOGICAL_4 back, gfc_charlen_type len)
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48 {
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49 index_type ret;
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50 index_type sstride;
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51 index_type extent;
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52 const GFC_UINTEGER_4 *src;
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53 const GFC_UINTEGER_4 *maxval;
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54 index_type i;
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55
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56 extent = GFC_DESCRIPTOR_EXTENT(array,0);
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57 if (extent <= 0)
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58 return 0;
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59
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60 sstride = GFC_DESCRIPTOR_STRIDE(array,0) * len;
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61
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62 ret = 1;
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63 src = array->base_addr;
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64 maxval = NULL;
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65 for (i=1; i<=extent; i++)
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66 {
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67 if (maxval == NULL || (back ? compare_fcn (src, maxval, len) >= 0 :
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68 compare_fcn (src, maxval, len) > 0))
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69 {
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70 ret = i;
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71 maxval = src;
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72 }
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73 src += sstride;
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74 }
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75 return ret;
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76 }
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77
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78 extern GFC_INTEGER_8 mmaxloc2_8_s4 (gfc_array_s4 * const restrict,
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79 gfc_array_l1 *const restrict mask, GFC_LOGICAL_4 back,
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80 gfc_charlen_type);
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81 export_proto(mmaxloc2_8_s4);
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82
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83 GFC_INTEGER_8
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84 mmaxloc2_8_s4 (gfc_array_s4 * const restrict array,
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85 gfc_array_l1 * const restrict mask, GFC_LOGICAL_4 back,
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86 gfc_charlen_type len)
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87 {
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88 index_type ret;
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89 index_type sstride;
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90 index_type extent;
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91 const GFC_UINTEGER_4 *src;
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92 const GFC_UINTEGER_4 *maxval;
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93 index_type i, j;
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94 GFC_LOGICAL_1 *mbase;
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95 int mask_kind;
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96 index_type mstride;
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97
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98 extent = GFC_DESCRIPTOR_EXTENT(array,0);
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99 if (extent <= 0)
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100 return 0;
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101
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102 sstride = GFC_DESCRIPTOR_STRIDE(array,0) * len;
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103
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104 mask_kind = GFC_DESCRIPTOR_SIZE (mask);
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105 mbase = mask->base_addr;
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106
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107 if (mask_kind == 1 || mask_kind == 2 || mask_kind == 4 || mask_kind == 8
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108 #ifdef HAVE_GFC_LOGICAL_16
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109 || mask_kind == 16
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110 #endif
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111 )
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112 mbase = GFOR_POINTER_TO_L1 (mbase, mask_kind);
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113 else
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114 internal_error (NULL, "Funny sized logical array");
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115
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116 mstride = GFC_DESCRIPTOR_STRIDE_BYTES(mask,0);
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117
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118 /* Search for the first occurrence of a true element in mask. */
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119 for (j=0; j<extent; j++)
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120 {
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121 if (*mbase)
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122 break;
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123 mbase += mstride;
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124 }
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125
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126 if (j == extent)
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127 return 0;
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128
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129 ret = j + 1;
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130 src = array->base_addr + j * sstride;
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131 maxval = src;
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132
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133 for (i=j+1; i<=extent; i++)
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134 {
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135 if (*mbase && (back ? compare_fcn (src, maxval, len) >= 0 :
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136 compare_fcn (src, maxval, len) > 0))
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137 {
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138 ret = i;
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139 maxval = src;
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140 }
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141 src += sstride;
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142 mbase += mstride;
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143 }
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144 return ret;
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145 }
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146
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147 extern GFC_INTEGER_8 smaxloc2_8_s4 (gfc_array_s4 * const restrict,
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148 GFC_LOGICAL_4 *mask, GFC_LOGICAL_4 back, gfc_charlen_type);
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149 export_proto(smaxloc2_8_s4);
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150
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151 GFC_INTEGER_8
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152 smaxloc2_8_s4 (gfc_array_s4 * const restrict array,
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153 GFC_LOGICAL_4 *mask, GFC_LOGICAL_4 back, gfc_charlen_type len)
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154 {
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155 if (mask)
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156 return maxloc2_8_s4 (array, len, back);
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157 else
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158 return 0;
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159 }
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160
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161 #endif
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