1 | #ifndef Morpheo_BitManipulation_h |
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2 | #define Morpheo_BitManipulation_h |
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3 | |
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4 | /* |
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5 | * $Id: BitManipulation.h 113 2009-04-14 18:39:12Z rosiere $ |
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6 | * |
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7 | * [ Description ] |
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8 | * |
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9 | */ |
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10 | |
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11 | #include <stdint.h> |
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12 | #include <iostream> |
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13 | |
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14 | namespace morpheo { |
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15 | |
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16 | //............................................................................ |
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17 | // gen_mask .................................................................. |
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18 | //............................................................................ |
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19 | |
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20 | template <typename T> |
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21 | T gen_mask (uint32_t size) |
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22 | { |
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23 | T mask = 0; |
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24 | for (uint32_t i=0; i<size; i++) |
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25 | { |
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26 | mask <<= 1; |
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27 | mask |= 1; |
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28 | } |
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29 | return mask; |
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30 | }; |
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31 | |
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32 | template <typename T> |
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33 | T gen_mask (uint32_t index_max, uint32_t index_min) |
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34 | { |
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35 | return (gen_mask<T>(index_max-index_min+1)<<index_min); |
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36 | }; |
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37 | |
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38 | template <typename T> |
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39 | T gen_mask_not (uint32_t index_max, uint32_t index_min) |
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40 | { |
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41 | return ~(gen_mask<T>(index_max-index_min+1)<<index_min); |
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42 | }; |
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43 | |
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44 | template <typename T> |
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45 | T gen_mask_not (uint32_t size) |
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46 | { |
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47 | return gen_mask_not<T>(size-1,0); |
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48 | }; |
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49 | |
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50 | //............................................................................ |
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51 | // mask, mask_not ............................................................ |
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52 | //............................................................................ |
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53 | template <typename T> |
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54 | T mask (T data, uint32_t index_max, uint32_t index_min) |
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55 | { |
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56 | return gen_mask <T>(index_max,index_min) & data; |
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57 | } |
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58 | |
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59 | template <typename T> |
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60 | T mask_not (T data, uint32_t index_max, uint32_t index_min) |
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61 | { |
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62 | return gen_mask_not<T>(index_max,index_min) & data; |
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63 | } |
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64 | |
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65 | //............................................................................ |
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66 | // shift_left_logic, shift_right_logic ....................................... |
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67 | //............................................................................ |
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68 | template <typename T> |
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69 | T shift_logic_left (uint32_t size, T data, T value) |
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70 | { |
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71 | T mask = gen_mask<T> (size); |
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72 | |
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73 | return (mask & ((mask & data) << value)); |
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74 | } |
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75 | |
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76 | template <typename T> |
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77 | T shift_logic_right (uint32_t size, T data, T value) |
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78 | { |
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79 | T mask = gen_mask<T> (size); |
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80 | |
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81 | return (mask & ((mask & data) >> value)); |
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82 | } |
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83 | |
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84 | //............................................................................ |
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85 | // shift_logic ............................................................... |
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86 | //............................................................................ |
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87 | template <typename T> |
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88 | T shift_logic (uint32_t size, T data, T value, bool is_direction_left) |
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89 | { |
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90 | if (is_direction_left == true) |
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91 | return shift_logic_left <T> (size, data, value); |
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92 | else |
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93 | return shift_logic_right <T> (size, data, value); |
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94 | } |
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95 | |
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96 | //............................................................................ |
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97 | // shift_left_arithmetic, shift_right_arithmetic ............................. |
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98 | //............................................................................ |
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99 | template <typename T> |
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100 | T shift_arithmetic_left (uint32_t size, T data, T value) |
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101 | { |
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102 | bool carry = (data&1) != 0; |
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103 | |
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104 | if (carry == false) |
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105 | return shift_logic_left <T> (size,data,value); |
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106 | else |
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107 | { |
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108 | if (value > size) |
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109 | return gen_mask<T> (size); |
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110 | |
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111 | T mask = gen_mask<T> (value); |
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112 | return shift_logic_left <T> (size,data,value) | mask; |
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113 | } |
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114 | } |
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115 | |
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116 | |
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117 | template <typename T> |
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118 | T shift_arithmetic_right (uint32_t size, T data, T value) |
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119 | { |
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120 | bool carry = (data&(1<<(size-1))) != 0; |
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121 | |
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122 | if (carry == false) |
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123 | return shift_logic_right <T> (size,data,value); |
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124 | else |
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125 | { |
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126 | if (value > size) |
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127 | return gen_mask<T> (size); |
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128 | |
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129 | T mask = gen_mask<T> (value) << (size-value); |
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130 | return ((shift_logic_right <T> (size,data,value)) | mask); |
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131 | } |
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132 | } |
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133 | |
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134 | //............................................................................ |
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135 | // shift_arithmetic .......................................................... |
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136 | //............................................................................ |
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137 | template <typename T> |
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138 | T shift_arithmetic (uint32_t size, T data, T value, bool is_direction_left) |
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139 | { |
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140 | if (is_direction_left == true) |
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141 | return shift_arithmetic_left <T> (size, data, value); |
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142 | else |
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143 | return shift_arithmetic_right <T> (size, data, value); |
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144 | } |
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145 | |
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146 | //............................................................................ |
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147 | // shift ..................................................................... |
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148 | //............................................................................ |
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149 | template <typename T> |
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150 | T shift (uint32_t size, T data, T value, bool is_direction_left, bool is_shift_arithmetic) |
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151 | { |
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152 | if (is_shift_arithmetic == true) |
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153 | return shift_arithmetic <T> (size, data, value, is_direction_left); |
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154 | else |
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155 | return shift_logic <T> (size, data, value, is_direction_left); |
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156 | } |
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157 | |
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158 | //............................................................................ |
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159 | // rotate_left, rotate_right ................................................. |
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160 | //............................................................................ |
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161 | template <typename T> |
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162 | T rotate_left (uint32_t size, T data, T value) |
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163 | { |
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164 | T mask = gen_mask<T> (size); |
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165 | T rotate_mask = gen_mask<T> (value); |
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166 | T rotate = rotate_mask & shift_logic_right<T>(size,data,size-value); |
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167 | return (mask & (shift_logic_left <T> (size, data, value) | rotate)); |
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168 | } |
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169 | |
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170 | template <typename T> |
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171 | T rotate_right (uint32_t size, T data, T value) |
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172 | { |
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173 | T mask = gen_mask<T> (size); |
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174 | T rotate_mask = gen_mask<T> (value); |
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175 | T rotate = shift_logic_left <T> (size,rotate_mask & data,size-value); |
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176 | return (mask & (shift_logic_right<T> (size, data, value) | rotate)); |
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177 | } |
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178 | |
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179 | //............................................................................ |
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180 | // rotate .................................................................... |
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181 | //............................................................................ |
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182 | template <typename T> |
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183 | T rotate (uint32_t size, T data, T value, bool is_direction_left) |
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184 | { |
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185 | if (is_direction_left == true) |
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186 | return rotate_left <T> (size, data, value); |
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187 | else |
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188 | return rotate_right <T> (size, data, value); |
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189 | } |
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190 | |
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191 | //............................................................................ |
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192 | // range ..................................................................... |
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193 | //............................................................................ |
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194 | template <typename T> |
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195 | T range (T data, uint32_t index_max, uint32_t index_min) |
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196 | { |
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197 | return (mask<T>(data,index_max,index_min) >> index_min); |
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198 | } |
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199 | |
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200 | template <typename T> |
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201 | T range (T data, uint32_t nb_bits) |
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202 | { |
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203 | return gen_mask<T>(nb_bits) & data; |
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204 | } |
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205 | |
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206 | //............................................................................ |
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207 | // insert .................................................................... |
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208 | //............................................................................ |
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209 | template <typename T> |
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210 | T insert (T data_old, T data_new, uint32_t index_max, uint32_t index_min) |
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211 | { |
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212 | return (mask<T>(data_new,index_max,index_min) | mask_not<T>(data_old,index_max,index_min)); |
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213 | } |
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214 | |
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215 | //............................................................................ |
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216 | // extend .................................................................... |
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217 | //............................................................................ |
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218 | template <typename T> |
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219 | T extend (uint32_t size, T data, bool extend_with_sign, uint32_t nb_bits_keep) |
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220 | { |
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221 | if (size < nb_bits_keep) |
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222 | return data; |
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223 | |
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224 | if (extend_with_sign and ((data>>(nb_bits_keep-1))&1)) |
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225 | return data | (mask<T>(gen_mask<T>(size),size-1, nb_bits_keep)); |
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226 | else |
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227 | return data & (mask<T>(gen_mask<T>(size),nb_bits_keep-1, 0)); |
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228 | } |
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229 | |
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230 | //............................................................................ |
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231 | // duplicate.................................................................. |
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232 | //............................................................................ |
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233 | |
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234 | template <typename T> |
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235 | T duplicate (uint32_t size, T data_src, uint32_t nb_bits, uint32_t index_min) |
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236 | { |
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237 | T data_duplicate = mask<T>((data_src)>>index_min, nb_bits-1, 0); |
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238 | T data_dest = 0; |
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239 | |
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240 | for (uint32_t i=0; i < size; i+=nb_bits) |
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241 | data_dest |= (data_duplicate<<i); |
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242 | |
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243 | return data_dest; |
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244 | } |
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245 | |
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246 | template <typename T> |
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247 | T duplicate (uint32_t size, T data_src, uint32_t nb_bits) |
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248 | { |
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249 | return duplicate<T> (size,data_src,nb_bits,0); |
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250 | } |
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251 | |
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252 | |
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253 | }; // end namespace morpheo |
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254 | |
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255 | #endif |
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