1 | #ifndef morpheo_BitManipulation |
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2 | #define morpheo_BitManipulation |
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3 | |
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4 | /* |
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5 | * $Id$ |
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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 | using namespace std; |
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14 | |
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15 | namespace morpheo { |
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16 | |
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17 | // gen_mask ..................................... |
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18 | |
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19 | template <typename T> |
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20 | T gen_mask (uint32_t size) |
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21 | { |
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22 | T mask = 0; |
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23 | for (uint32_t i=0; i<size; i++) |
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24 | { |
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25 | mask <<= 1; |
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26 | mask |= 1; |
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27 | } |
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28 | return mask; |
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29 | }; |
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30 | |
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31 | // shift_left_logic, shift_right_logic .......... |
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32 | template <typename T> |
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33 | T shift_logic_left (uint32_t size, uint32_t data, uint32_t value) |
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34 | { |
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35 | T mask = gen_mask<T> (size); |
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36 | |
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37 | return (mask & ((mask & data) << value)); |
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38 | } |
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39 | |
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40 | template <typename T> |
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41 | T shift_logic_right (uint32_t size, uint32_t data, uint32_t value) |
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42 | { |
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43 | T mask = gen_mask<T> (size); |
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44 | |
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45 | return (mask & ((mask & data) >> value)); |
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46 | } |
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47 | |
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48 | // shift_logic .................................. |
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49 | template <typename T> |
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50 | T shift_logic (uint32_t size, uint32_t data, uint32_t value, bool is_direction_left) |
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51 | { |
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52 | if (is_direction_left == true) |
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53 | return shift_logic_left <T> (size, data, value); |
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54 | else |
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55 | return shift_logic_right <T> (size, data, value); |
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56 | } |
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57 | |
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58 | // shift_left_arithmetic, shift_right_arithmetic |
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59 | template <typename T> |
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60 | T shift_arithmetic_left (uint32_t size, uint32_t data, uint32_t value) |
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61 | { |
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62 | bool carry = (data&1) != 0; |
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63 | |
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64 | if (carry == false) |
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65 | return shift_logic_left <T> (size,data,value); |
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66 | else |
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67 | { |
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68 | if (value > size) |
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69 | return gen_mask<T> (size); |
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70 | |
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71 | T mask = gen_mask<T> (value); |
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72 | return shift_logic_left <T> (size,data,value) | mask; |
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73 | } |
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74 | } |
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75 | |
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76 | |
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77 | template <typename T> |
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78 | T shift_arithmetic_right (uint32_t size, uint32_t data, uint32_t value) |
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79 | { |
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80 | bool carry = (data&(1<<(size-1))) != 0; |
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81 | |
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82 | if (carry == false) |
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83 | return shift_logic_right <T> (size,data,value); |
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84 | else |
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85 | { |
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86 | if (value > size) |
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87 | return gen_mask<T> (size); |
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88 | |
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89 | T mask = gen_mask<T> (value) << (size-value); |
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90 | return ((shift_logic_right <T> (size,data,value)) | mask); |
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91 | } |
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92 | } |
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93 | |
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94 | // shift_arithmetic ............................. |
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95 | template <typename T> |
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96 | T shift_arithmetic (uint32_t size, uint32_t data, uint32_t value, bool is_direction_left) |
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97 | { |
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98 | if (is_direction_left == true) |
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99 | return shift_arithmetic_left <T> (size, data, value); |
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100 | else |
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101 | return shift_arithmetic_right <T> (size, data, value); |
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102 | } |
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103 | |
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104 | // shift ........................................ |
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105 | template <typename T> |
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106 | T shift (uint32_t size, uint32_t data, uint32_t value, bool is_direction_left, bool is_shift_arithmetic) |
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107 | { |
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108 | if (is_shift_arithmetic == true) |
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109 | return shift_arithmetic <T> (size, data, value, is_direction_left); |
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110 | else |
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111 | return shift_logic <T> (size, data, value, is_direction_left); |
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112 | } |
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113 | |
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114 | // rotate_left, rotate_right .................... |
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115 | |
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116 | template <typename T> |
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117 | T rotate_left (uint32_t size, uint32_t data, uint32_t value) |
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118 | { |
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119 | T mask = gen_mask<T> (size); |
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120 | T rotate_mask = gen_mask<T> (value); |
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121 | T rotate = rotate_mask & shift_logic_right<T>(size,data,size-value); |
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122 | return (mask & (shift_logic_left <T> (size, data, value) | rotate)); |
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123 | } |
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124 | |
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125 | template <typename T> |
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126 | T rotate_right (uint32_t size, uint32_t data, uint32_t value) |
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127 | { |
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128 | T mask = gen_mask<T> (size); |
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129 | T rotate_mask = gen_mask<T> (value); |
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130 | T rotate = shift_logic_left <T> (size,rotate_mask & data,size-value); |
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131 | return (mask & (shift_logic_right<T> (size, data, value) | rotate)); |
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132 | } |
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133 | |
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134 | // rotate ....................................... |
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135 | template <typename T> |
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136 | T rotate (uint32_t size, uint32_t data, uint32_t value, bool is_direction_left) |
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137 | { |
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138 | if (is_direction_left == true) |
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139 | return rotate_left <T> (size, data, value); |
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140 | else |
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141 | return rotate_right <T> (size, data, value); |
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142 | } |
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143 | |
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144 | // range ........................................ |
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145 | template <typename T> |
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146 | T range (uint32_t size, uint32_t data, uint32_t index_max, uint32_t index_min) |
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147 | { |
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148 | return gen_mask<T>(index_max-index_min+1) & shift_logic_left<T> (size, data, index_min); |
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149 | } |
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150 | |
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151 | template <typename T> |
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152 | T range (uint32_t size, uint32_t data, uint32_t nb_bits) |
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153 | { |
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154 | return gen_mask<T>(nb_bits) & data; |
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155 | } |
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156 | |
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157 | |
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158 | }; // end namespace morpheo |
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159 | |
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160 | #endif |
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