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131
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1 /* Implementation of the MINLOC intrinsic
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2 Copyright (C) 2017-2018 Free Software Foundation, Inc.
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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 #include <limits.h>
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31
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32
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33 #if defined (HAVE_GFC_INTEGER_1) && defined (HAVE_GFC_INTEGER_8)
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34
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35 #define HAVE_BACK_ARG 1
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36
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37 static inline int
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38 compare_fcn (const GFC_INTEGER_1 *a, const GFC_INTEGER_1 *b, gfc_charlen_type n)
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39 {
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40 if (sizeof (GFC_INTEGER_1) == 1)
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41 return memcmp (a, b, n);
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42 else
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43 return memcmp_char4 (a, b, n);
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44
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45 }
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46
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47 extern void minloc0_8_s1 (gfc_array_i8 * const restrict retarray,
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48 gfc_array_s1 * const restrict array, GFC_LOGICAL_4 back, gfc_charlen_type len);
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49 export_proto(minloc0_8_s1);
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50
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51 void
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52 minloc0_8_s1 (gfc_array_i8 * const restrict retarray,
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53 gfc_array_s1 * const restrict array, GFC_LOGICAL_4 back, gfc_charlen_type len)
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54 {
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55 index_type count[GFC_MAX_DIMENSIONS];
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56 index_type extent[GFC_MAX_DIMENSIONS];
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57 index_type sstride[GFC_MAX_DIMENSIONS];
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58 index_type dstride;
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59 const GFC_INTEGER_1 *base;
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60 GFC_INTEGER_8 * restrict dest;
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61 index_type rank;
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62 index_type n;
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63
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64 rank = GFC_DESCRIPTOR_RANK (array);
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65 if (rank <= 0)
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66 runtime_error ("Rank of array needs to be > 0");
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67
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68 if (retarray->base_addr == NULL)
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69 {
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70 GFC_DIMENSION_SET(retarray->dim[0], 0, rank-1, 1);
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71 retarray->dtype.rank = 1;
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72 retarray->offset = 0;
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73 retarray->base_addr = xmallocarray (rank, sizeof (GFC_INTEGER_8));
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74 }
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75 else
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76 {
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77 if (unlikely (compile_options.bounds_check))
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78 bounds_iforeach_return ((array_t *) retarray, (array_t *) array,
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79 "MINLOC");
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80 }
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81
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82 dstride = GFC_DESCRIPTOR_STRIDE(retarray,0);
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83 dest = retarray->base_addr;
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84 for (n = 0; n < rank; n++)
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85 {
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86 sstride[n] = GFC_DESCRIPTOR_STRIDE(array,n) * len;
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87 extent[n] = GFC_DESCRIPTOR_EXTENT(array,n);
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88 count[n] = 0;
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89 if (extent[n] <= 0)
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90 {
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91 /* Set the return value. */
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92 for (n = 0; n < rank; n++)
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93 dest[n * dstride] = 0;
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94 return;
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95 }
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96 }
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97
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98 base = array->base_addr;
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99
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100 /* Initialize the return value. */
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101 for (n = 0; n < rank; n++)
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102 dest[n * dstride] = 1;
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103 {
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104
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105 const GFC_INTEGER_1 *minval;
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106 minval = NULL;
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107
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108 while (base)
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109 {
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110 do
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111 {
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112 /* Implementation start. */
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113
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114 if (minval == NULL || (back ? compare_fcn (base, minval, len) <= 0 :
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115 compare_fcn (base, minval, len) < 0))
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116 {
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117 minval = base;
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118 for (n = 0; n < rank; n++)
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119 dest[n * dstride] = count[n] + 1;
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120 }
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121 /* Implementation end. */
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122 /* Advance to the next element. */
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123 base += sstride[0];
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124 }
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125 while (++count[0] != extent[0]);
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126 n = 0;
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127 do
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128 {
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129 /* When we get to the end of a dimension, reset it and increment
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130 the next dimension. */
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131 count[n] = 0;
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132 /* We could precalculate these products, but this is a less
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133 frequently used path so probably not worth it. */
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134 base -= sstride[n] * extent[n];
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135 n++;
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136 if (n >= rank)
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137 {
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138 /* Break out of the loop. */
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139 base = NULL;
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140 break;
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141 }
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142 else
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143 {
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144 count[n]++;
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145 base += sstride[n];
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146 }
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147 }
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148 while (count[n] == extent[n]);
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149 }
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150 }
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151 }
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152
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153
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154 extern void mminloc0_8_s1 (gfc_array_i8 * const restrict,
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155 gfc_array_s1 * const restrict, gfc_array_l1 * const restrict , GFC_LOGICAL_4 back,
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156 gfc_charlen_type len);
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157 export_proto(mminloc0_8_s1);
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158
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159 void
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160 mminloc0_8_s1 (gfc_array_i8 * const restrict retarray,
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161 gfc_array_s1 * const restrict array,
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162 gfc_array_l1 * const restrict mask, GFC_LOGICAL_4 back,
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163 gfc_charlen_type len)
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164 {
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165 index_type count[GFC_MAX_DIMENSIONS];
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166 index_type extent[GFC_MAX_DIMENSIONS];
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167 index_type sstride[GFC_MAX_DIMENSIONS];
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168 index_type mstride[GFC_MAX_DIMENSIONS];
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169 index_type dstride;
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170 GFC_INTEGER_8 *dest;
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171 const GFC_INTEGER_1 *base;
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172 GFC_LOGICAL_1 *mbase;
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173 int rank;
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174 index_type n;
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175 int mask_kind;
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176
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177 rank = GFC_DESCRIPTOR_RANK (array);
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178 if (rank <= 0)
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179 runtime_error ("Rank of array needs to be > 0");
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180
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181 if (retarray->base_addr == NULL)
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182 {
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183 GFC_DIMENSION_SET(retarray->dim[0], 0, rank - 1, 1);
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184 retarray->dtype.rank = 1;
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185 retarray->offset = 0;
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186 retarray->base_addr = xmallocarray (rank, sizeof (GFC_INTEGER_8));
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187 }
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188 else
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189 {
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190 if (unlikely (compile_options.bounds_check))
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191 {
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192
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193 bounds_iforeach_return ((array_t *) retarray, (array_t *) array,
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194 "MINLOC");
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195 bounds_equal_extents ((array_t *) mask, (array_t *) array,
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196 "MASK argument", "MINLOC");
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197 }
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198 }
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199
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200 mask_kind = GFC_DESCRIPTOR_SIZE (mask);
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201
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202 mbase = mask->base_addr;
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203
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204 if (mask_kind == 1 || mask_kind == 2 || mask_kind == 4 || mask_kind == 8
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205 #ifdef HAVE_GFC_LOGICAL_16
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206 || mask_kind == 16
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207 #endif
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208 )
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209 mbase = GFOR_POINTER_TO_L1 (mbase, mask_kind);
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210 else
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211 runtime_error ("Funny sized logical array");
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212
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213 dstride = GFC_DESCRIPTOR_STRIDE(retarray,0);
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214 dest = retarray->base_addr;
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215 for (n = 0; n < rank; n++)
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216 {
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217 sstride[n] = GFC_DESCRIPTOR_STRIDE(array,n) * len;
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218 mstride[n] = GFC_DESCRIPTOR_STRIDE_BYTES(mask,n);
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219 extent[n] = GFC_DESCRIPTOR_EXTENT(array,n);
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220 count[n] = 0;
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221 if (extent[n] <= 0)
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222 {
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223 /* Set the return value. */
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224 for (n = 0; n < rank; n++)
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225 dest[n * dstride] = 0;
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226 return;
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227 }
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228 }
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229
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230 base = array->base_addr;
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231
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232 /* Initialize the return value. */
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233 for (n = 0; n < rank; n++)
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234 dest[n * dstride] = 0;
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235 {
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236
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237 const GFC_INTEGER_1 *minval;
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238
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239 minval = NULL;
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240
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241 while (base)
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242 {
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243 do
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244 {
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245 /* Implementation start. */
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246
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247 if (*mbase &&
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248 (minval == NULL || (back ? compare_fcn (base, minval, len) <= 0 :
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249 compare_fcn (base, minval, len) < 0)))
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250 {
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251 minval = base;
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252 for (n = 0; n < rank; n++)
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253 dest[n * dstride] = count[n] + 1;
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254 }
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255 /* Implementation end. */
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256 /* Advance to the next element. */
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257 base += sstride[0];
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258 mbase += mstride[0];
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259 }
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260 while (++count[0] != extent[0]);
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261 n = 0;
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262 do
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263 {
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264 /* When we get to the end of a dimension, reset it and increment
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265 the next dimension. */
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266 count[n] = 0;
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267 /* We could precalculate these products, but this is a less
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268 frequently used path so probably not worth it. */
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269 base -= sstride[n] * extent[n];
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270 mbase -= mstride[n] * extent[n];
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271 n++;
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272 if (n >= rank)
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273 {
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274 /* Break out of the loop. */
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275 base = NULL;
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276 break;
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277 }
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278 else
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279 {
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280 count[n]++;
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281 base += sstride[n];
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282 mbase += mstride[n];
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283 }
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284 }
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285 while (count[n] == extent[n]);
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286 }
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287 }
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288 }
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289
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290
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291 extern void sminloc0_8_s1 (gfc_array_i8 * const restrict,
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292 gfc_array_s1 * const restrict, GFC_LOGICAL_4 *, GFC_LOGICAL_4 back,
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293 gfc_charlen_type len);
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294 export_proto(sminloc0_8_s1);
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295
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296 void
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297 sminloc0_8_s1 (gfc_array_i8 * const restrict retarray,
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298 gfc_array_s1 * const restrict array,
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299 GFC_LOGICAL_4 * mask, GFC_LOGICAL_4 back,
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300 gfc_charlen_type len)
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301 {
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302 index_type rank;
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303 index_type dstride;
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304 index_type n;
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305 GFC_INTEGER_8 *dest;
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306
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307 if (*mask)
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308 {
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309 #ifdef HAVE_BACK_ARG
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310 minloc0_8_s1 (retarray, array, back, len);
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311 #else
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312 minloc0_8_s1 (retarray, array, len);
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313 #endif
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314 return;
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315 }
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316
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317 rank = GFC_DESCRIPTOR_RANK (array);
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318
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319 if (rank <= 0)
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320 runtime_error ("Rank of array needs to be > 0");
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321
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322 if (retarray->base_addr == NULL)
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323 {
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324 GFC_DIMENSION_SET(retarray->dim[0], 0, rank-1, 1);
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325 retarray->dtype.rank = 1;
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326 retarray->offset = 0;
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327 retarray->base_addr = xmallocarray (rank, sizeof (GFC_INTEGER_8));
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328 }
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329 else if (unlikely (compile_options.bounds_check))
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330 {
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331 bounds_iforeach_return ((array_t *) retarray, (array_t *) array,
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332 "MINLOC");
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333 }
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334
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335 dstride = GFC_DESCRIPTOR_STRIDE(retarray,0);
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336 dest = retarray->base_addr;
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337 for (n = 0; n<rank; n++)
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338 dest[n * dstride] = 0 ;
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339 }
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340 #endif
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