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111
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1 `/* Implementation of the EOSHIFT intrinsic
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145
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2 Copyright (C) 2002-2020 Free Software Foundation, Inc.
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111
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3 Contributed by Paul Brook <paul@nowt.org>
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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 <string.h>'
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28
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29 include(iparm.m4)dnl
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30
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31 `#if defined (HAVE_'atype_name`)
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32
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33 static void
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34 eoshift1 (gfc_array_char * const restrict ret,
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35 const gfc_array_char * const restrict array,
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36 const 'atype` * const restrict h,
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37 const char * const restrict pbound,
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38 const 'atype_name` * const restrict pwhich,
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39 const char * filler, index_type filler_len)
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40 {
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41 /* r.* indicates the return array. */
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42 index_type rstride[GFC_MAX_DIMENSIONS];
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43 index_type rstride0;
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44 index_type roffset;
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45 char *rptr;
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46 char * restrict dest;
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47 /* s.* indicates the source array. */
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48 index_type sstride[GFC_MAX_DIMENSIONS];
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49 index_type sstride0;
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50 index_type soffset;
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51 const char *sptr;
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52 const char *src;
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53 /* h.* indicates the shift array. */
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54 index_type hstride[GFC_MAX_DIMENSIONS];
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55 index_type hstride0;
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56 const 'atype_name` *hptr;
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57
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58 index_type count[GFC_MAX_DIMENSIONS];
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59 index_type extent[GFC_MAX_DIMENSIONS];
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60 index_type dim;
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61 index_type len;
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62 index_type n;
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63 index_type size;
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64 index_type arraysize;
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65 int which;
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66 'atype_name` sh;
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67 'atype_name` delta;
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68
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69 /* The compiler cannot figure out that these are set, initialize
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70 them to avoid warnings. */
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71 len = 0;
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72 soffset = 0;
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73 roffset = 0;
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74
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75 size = GFC_DESCRIPTOR_SIZE(array);
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76
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77 if (pwhich)
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78 which = *pwhich - 1;
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79 else
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80 which = 0;
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81
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82 extent[0] = 1;
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83 count[0] = 0;
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84
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85 arraysize = size0 ((array_t *) array);
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86 if (ret->base_addr == NULL)
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87 {
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88 ret->offset = 0;
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131
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89 GFC_DTYPE_COPY(ret,array);
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90 for (index_type i = 0; i < GFC_DESCRIPTOR_RANK (array); i++)
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111
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91 {
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92 index_type ub, str;
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93
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94 ub = GFC_DESCRIPTOR_EXTENT(array,i) - 1;
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95
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96 if (i == 0)
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97 str = 1;
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98 else
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99 str = GFC_DESCRIPTOR_EXTENT(ret,i-1)
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100 * GFC_DESCRIPTOR_STRIDE(ret,i-1);
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101
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102 GFC_DIMENSION_SET(ret->dim[i], 0, ub, str);
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103
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104 }
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105 /* xmallocarray allocates a single byte for zero size. */
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106 ret->base_addr = xmallocarray (arraysize, size);
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107
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108 }
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109 else if (unlikely (compile_options.bounds_check))
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110 {
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111 bounds_equal_extents ((array_t *) ret, (array_t *) array,
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112 "return value", "EOSHIFT");
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113 }
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114
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115 if (unlikely (compile_options.bounds_check))
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116 {
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117 bounds_reduced_extents ((array_t *) h, (array_t *) array, which,
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118 "SHIFT argument", "EOSHIFT");
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119 }
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120
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121 if (arraysize == 0)
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122 return;
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123
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124 n = 0;
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125 for (dim = 0; dim < GFC_DESCRIPTOR_RANK (array); dim++)
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126 {
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127 if (dim == which)
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128 {
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129 roffset = GFC_DESCRIPTOR_STRIDE_BYTES(ret,dim);
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130 if (roffset == 0)
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131 roffset = size;
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132 soffset = GFC_DESCRIPTOR_STRIDE_BYTES(array,dim);
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133 if (soffset == 0)
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134 soffset = size;
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135 len = GFC_DESCRIPTOR_EXTENT(array,dim);
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136 }
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137 else
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138 {
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139 count[n] = 0;
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140 extent[n] = GFC_DESCRIPTOR_EXTENT(array,dim);
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141 rstride[n] = GFC_DESCRIPTOR_STRIDE_BYTES(ret,dim);
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142 sstride[n] = GFC_DESCRIPTOR_STRIDE_BYTES(array,dim);
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143
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144 hstride[n] = GFC_DESCRIPTOR_STRIDE(h,n);
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145 n++;
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146 }
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147 }
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148 if (sstride[0] == 0)
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149 sstride[0] = size;
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150 if (rstride[0] == 0)
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151 rstride[0] = size;
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152 if (hstride[0] == 0)
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153 hstride[0] = 1;
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154
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155 dim = GFC_DESCRIPTOR_RANK (array);
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156 rstride0 = rstride[0];
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157 sstride0 = sstride[0];
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158 hstride0 = hstride[0];
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159 rptr = ret->base_addr;
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160 sptr = array->base_addr;
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161 hptr = h->base_addr;
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162
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163 while (rptr)
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164 {
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165 /* Do the shift for this dimension. */
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166 sh = *hptr;
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167 if (( sh >= 0 ? sh : -sh ) > len)
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168 {
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169 delta = len;
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170 sh = len;
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171 }
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172 else
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173 delta = (sh >= 0) ? sh: -sh;
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174
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175 if (sh > 0)
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176 {
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177 src = &sptr[delta * soffset];
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178 dest = rptr;
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179 }
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180 else
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181 {
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182 src = sptr;
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183 dest = &rptr[delta * roffset];
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184 }
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185
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186 /* If the elements are contiguous, perform a single block move. */
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187 if (soffset == size && roffset == size)
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188 {
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189 size_t chunk = size * (len - delta);
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190 memcpy (dest, src, chunk);
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191 dest += chunk;
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192 }
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193 else
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194 {
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195 for (n = 0; n < len - delta; n++)
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196 {
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197 memcpy (dest, src, size);
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198 dest += roffset;
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199 src += soffset;
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200 }
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201 }
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202 if (sh < 0)
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203 dest = rptr;
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204 n = delta;
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205
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206 if (pbound)
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207 while (n--)
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208 {
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209 memcpy (dest, pbound, size);
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210 dest += roffset;
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211 }
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212 else
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213 while (n--)
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214 {
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215 index_type i;
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216
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217 if (filler_len == 1)
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218 memset (dest, filler[0], size);
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219 else
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220 for (i = 0; i < size; i += filler_len)
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221 memcpy (&dest[i], filler, filler_len);
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222
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223 dest += roffset;
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224 }
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225
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226 /* Advance to the next section. */
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227 rptr += rstride0;
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228 sptr += sstride0;
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229 hptr += hstride0;
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230 count[0]++;
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231 n = 0;
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232 while (count[n] == extent[n])
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233 {
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234 /* When we get to the end of a dimension, reset it and increment
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235 the next dimension. */
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236 count[n] = 0;
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237 /* We could precalculate these products, but this is a less
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238 frequently used path so probably not worth it. */
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239 rptr -= rstride[n] * extent[n];
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240 sptr -= sstride[n] * extent[n];
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241 hptr -= hstride[n] * extent[n];
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242 n++;
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243 if (n >= dim - 1)
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244 {
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245 /* Break out of the loop. */
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246 rptr = NULL;
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247 break;
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248 }
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249 else
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250 {
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251 count[n]++;
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252 rptr += rstride[n];
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253 sptr += sstride[n];
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254 hptr += hstride[n];
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255 }
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256 }
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257 }
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258 }
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259
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260 void eoshift1_'atype_kind` (gfc_array_char * const restrict,
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261 const gfc_array_char * const restrict,
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262 const 'atype` * const restrict, const char * const restrict,
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263 const 'atype_name` * const restrict);
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264 export_proto(eoshift1_'atype_kind`);
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265
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266 void
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267 eoshift1_'atype_kind` (gfc_array_char * const restrict ret,
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268 const gfc_array_char * const restrict array,
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269 const 'atype` * const restrict h,
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270 const char * const restrict pbound,
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271 const 'atype_name` * const restrict pwhich)
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272 {
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273 eoshift1 (ret, array, h, pbound, pwhich, "\0", 1);
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274 }
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275
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276
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277 void eoshift1_'atype_kind`_char (gfc_array_char * const restrict,
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278 GFC_INTEGER_4,
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279 const gfc_array_char * const restrict,
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280 const 'atype` * const restrict,
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281 const char * const restrict,
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282 const 'atype_name` * const restrict,
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283 GFC_INTEGER_4, GFC_INTEGER_4);
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284 export_proto(eoshift1_'atype_kind`_char);
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285
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286 void
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287 eoshift1_'atype_kind`_char (gfc_array_char * const restrict ret,
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288 GFC_INTEGER_4 ret_length __attribute__((unused)),
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289 const gfc_array_char * const restrict array,
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290 const 'atype` * const restrict h,
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291 const char * const restrict pbound,
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292 const 'atype_name` * const restrict pwhich,
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293 GFC_INTEGER_4 array_length __attribute__((unused)),
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294 GFC_INTEGER_4 bound_length __attribute__((unused)))
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295 {
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296 eoshift1 (ret, array, h, pbound, pwhich, " ", 1);
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297 }
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298
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299
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300 void eoshift1_'atype_kind`_char4 (gfc_array_char * const restrict,
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301 GFC_INTEGER_4,
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302 const gfc_array_char * const restrict,
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303 const 'atype` * const restrict,
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304 const char * const restrict,
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305 const 'atype_name` * const restrict,
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306 GFC_INTEGER_4, GFC_INTEGER_4);
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307 export_proto(eoshift1_'atype_kind`_char4);
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308
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309 void
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310 eoshift1_'atype_kind`_char4 (gfc_array_char * const restrict ret,
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311 GFC_INTEGER_4 ret_length __attribute__((unused)),
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312 const gfc_array_char * const restrict array,
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313 const 'atype` * const restrict h,
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314 const char * const restrict pbound,
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315 const 'atype_name` * const restrict pwhich,
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316 GFC_INTEGER_4 array_length __attribute__((unused)),
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317 GFC_INTEGER_4 bound_length __attribute__((unused)))
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318 {
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319 static const gfc_char4_t space = (unsigned char) ''` ''`;
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320 eoshift1 (ret, array, h, pbound, pwhich,
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321 (const char *) &space, sizeof (gfc_char4_t));
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322 }
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323
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324 #endif'
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