[2] | 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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