[15] | 1 | #ifndef morpheo_behavioural_generic_victim_victim_pseudo_lru_Type_h |
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| 2 | #define morpheo_behavioural_generic_victim_victim_pseudo_lru_Type_h |
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[10] | 3 | |
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| 4 | /* |
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| 5 | * $Id: Types.h 81 2008-04-15 18:40:01Z 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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[78] | 11 | #include "Behavioural/Generic/Victim/include/Types.h" |
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[10] | 12 | |
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| 13 | namespace morpheo { |
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| 14 | namespace behavioural { |
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| 15 | namespace generic { |
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| 16 | namespace victim { |
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[15] | 17 | namespace victim_pseudo_lru { |
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[10] | 18 | |
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[78] | 19 | class entry_t |
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| 20 | { |
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| 21 | // Numerotation of victim_pseudo_lru's tree |
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| 22 | // Tree of Pseudo-LRU |
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| 23 | // |
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| 24 | // | d2 [3] | |
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| 25 | // | 0_______|_______1 | |
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| 26 | // | | | | |
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| 27 | // | d1 [1] [5] | |
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| 28 | // | 0___|___1 0___|___1 | |
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| 29 | // | | | | | | |
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| 30 | // | d0 [0] [2] [4] [6] | |
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| 31 | // | 0_|_1 0_|_1 0_|_1 0_|_1 | |
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| 32 | // | | | | | | | | | | |
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| 33 | // | Way Way Way Way Way Way Way Way | |
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| 34 | // | 0 1 2 3 4 5 6 7 | |
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| 35 | // |
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| 36 | // Access : Way N with N=2*n -> bit 2*n = 0 |
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| 37 | // with N=2*n+1 -> bit 2*n = 1 |
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| 38 | // |
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| 39 | // if bit = B, depth = D, next_B = B+D if B==1 |
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| 40 | // = B-D if B==0 |
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| 41 | // |
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| 42 | // Update : |
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[10] | 43 | |
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[78] | 44 | private : bool * _entry; |
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| 45 | private : uint32_t _size; |
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| 46 | |
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| 47 | public : entry_t () |
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| 48 | { |
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| 49 | }; |
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| 50 | public : entry_t (uint32_t size) : _size (size) |
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| 51 | { |
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| 52 | _entry = new bool [size]; |
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| 53 | |
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| 54 | // initialisation |
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| 55 | for (uint32_t i=0; i<size; i++) |
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| 56 | _entry [i] = false; |
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| 57 | } |
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| 58 | |
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| 59 | public : ~entry_t () |
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| 60 | { |
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| 61 | delete _entry; |
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| 62 | } |
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| 63 | |
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| 64 | private : uint32_t one_access (uint32_t index, uint32_t offset) |
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| 65 | { |
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| 66 | bool val = _entry[index]; |
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| 67 | |
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| 68 | // Compute next slot |
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| 69 | if (val == true) |
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| 70 | return index + offset; |
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| 71 | else |
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| 72 | return index - offset; |
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| 73 | } |
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| 74 | |
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| 75 | public : uint32_t access () |
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| 76 | { |
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| 77 | uint32_t index = (_size>>1)-1; // middle |
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| 78 | |
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| 79 | for (int32_t i=static_cast<uint32_t>(log2(_size)-1); i>= 1; i--) |
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| 80 | { |
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| 81 | index = one_access (index,(1<<(i-1))); |
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| 82 | } |
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| 83 | index = one_access (index,0); |
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| 84 | |
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| 85 | // reverse by one_access make always a reverse |
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| 86 | uint32_t offset = (_entry[index]==true)?1:0; |
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| 87 | |
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| 88 | return index+offset; |
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| 89 | } |
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| 90 | |
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| 91 | private : uint32_t one_update (uint32_t index, uint32_t offset, uint32_t value) |
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| 92 | { |
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| 93 | uint32_t mask = (offset==0)?1:(offset<<1); |
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| 94 | bool val = ((value & mask) != 0); |
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| 95 | |
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| 96 | // reverse |
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| 97 | _entry[index] = not val; |
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| 98 | |
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| 99 | if (val == true) |
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| 100 | // Compute next slot |
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| 101 | return index + offset; |
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| 102 | else |
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| 103 | return index - offset; |
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| 104 | } |
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| 105 | public : void update (uint32_t value) |
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| 106 | { |
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| 107 | uint32_t index = (_size>>1)-1; // middle |
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| 108 | |
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| 109 | for (int32_t i=static_cast<uint32_t>(log2(_size)-1); i>=1; i--) |
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| 110 | { |
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| 111 | index = one_update (index,1<<(i-1),value); |
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| 112 | } |
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| 113 | index = one_update (index,0,value); |
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| 114 | } |
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| 115 | |
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| 116 | public : std::string print () |
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| 117 | { |
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| 118 | std::string res = ""; |
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| 119 | |
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| 120 | for (int32_t i=static_cast<int32_t>(_size)-1; i>=0; i--) |
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| 121 | res += toString(_entry[i]) + " "; |
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| 122 | |
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| 123 | return res; |
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| 124 | } |
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| 125 | }; |
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| 126 | |
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[15] | 127 | }; // end namespace victim_pseudo_lru |
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[10] | 128 | }; // end namespace victim |
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| 129 | }; // end namespace generic |
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| 130 | }; // end namespace behavioural |
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| 131 | }; // end namespace morpheo |
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| 132 | |
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| 133 | #endif |
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