1 | #ifdef SYSTEMC |
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2 | /* |
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3 | * $Id$ |
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4 | * |
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5 | * [ Description ] |
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6 | * |
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7 | */ |
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8 | |
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9 | #include "Behavioural/Core/Multi_Front_end/Front_end/Prediction_unit/Update_Prediction_Table/include/Update_Prediction_Table.h" |
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10 | |
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11 | namespace morpheo { |
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12 | namespace behavioural { |
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13 | namespace core { |
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14 | namespace multi_front_end { |
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15 | namespace front_end { |
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16 | namespace prediction_unit { |
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17 | namespace update_prediction_table { |
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18 | |
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19 | |
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20 | #undef FUNCTION |
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21 | #define FUNCTION "Update_Prediction_Table::genMoore" |
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22 | void Update_Prediction_Table::genMoore (void) |
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23 | { |
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24 | log_begin(Update_Prediction_Table,FUNCTION); |
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25 | log_function(Update_Prediction_Table,FUNCTION,_name.c_str()); |
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26 | |
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27 | if (PORT_READ(in_NRESET) == 1) |
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28 | { |
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29 | |
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30 | // =================================================================== |
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31 | // =====[ DEPTH ]===================================================== |
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32 | // =================================================================== |
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33 | |
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34 | for (uint32_t i=0; i<_param->_nb_context; i++) |
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35 | { |
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36 | // is a valid instruction ? |
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37 | // If DEPTH_CURRENT : |
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38 | // equal at DEPTH_MIN -> not speculative |
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39 | // not include ]DEPTH_MIN:DEPTH_MAX] -> previous branch miss |
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40 | // include ]DEPTH_MIN:DEPTH_MAX] -> speculative |
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41 | |
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42 | uint32_t bottom = reg_UPT_BOTTOM [i]; |
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43 | uint32_t top = reg_UPT_TOP [i]; |
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44 | bool empty = reg_UPT_EMPTY [i]; |
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45 | |
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46 | // Depth_val is set when state is ok and the UPT[top] is empty |
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47 | PORT_WRITE(out_DEPTH_VAL [i],((reg_UPDATE_PREDICTION_TABLE [i][top]._state == UPDATE_PREDICTION_STATE_EMPTY) |
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48 | and (reg_UFPT_EVENT_STATE [i] == UFPT_EVENT_STATE_OK) |
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49 | and (reg_UPT_EVENT_STATE [i] == UPT_EVENT_STATE_OK) |
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50 | )); |
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51 | if (_param->_have_port_depth) |
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52 | { |
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53 | PORT_WRITE(out_DEPTH_CURRENT [i], top); |
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54 | PORT_WRITE(out_DEPTH_MIN [i], bottom); |
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55 | PORT_WRITE(out_DEPTH_MAX [i], top); |
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56 | } |
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57 | PORT_WRITE(out_DEPTH_FULL [i], not empty and (top == bottom)); |
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58 | } |
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59 | |
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60 | // =================================================================== |
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61 | // =====[ UPDATE ]==================================================== |
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62 | // =================================================================== |
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63 | { |
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64 | bool flush_ufpt [_param->_nb_context]; // event ufpt -> restore RAS, else update upt |
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65 | bool flush_upt [_param->_nb_context]; // event upt -> restore RAS, else restore others structure |
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66 | bool ufpt_can_update [_param->_nb_context]; |
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67 | bool upt_can_update [_param->_nb_context]; |
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68 | Tdepth_t tab_ufpt_depth [_param->_nb_context]; |
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69 | Tdepth_t tab_upt_depth [_param->_nb_context]; |
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70 | |
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71 | // Init |
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72 | for (uint32_t i=0; i<_param->_nb_context; i++) |
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73 | { |
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74 | ufpt_event_state_t ufpt_event_state = reg_UFPT_EVENT_STATE [i]; |
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75 | upt_event_state_t upt_event_state = reg_UPT_EVENT_STATE [i]; |
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76 | |
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77 | flush_ufpt [i] = (ufpt_event_state == UFPT_EVENT_STATE_KO_FLUSH); |
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78 | flush_upt [i] = ((upt_event_state == UPT_EVENT_STATE_KO_MISS_FLUSH_UPT) or |
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79 | (upt_event_state == UPT_EVENT_STATE_KO_EVENT_FLUSH_UPT)); |
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80 | ufpt_can_update [i] = true; |
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81 | upt_can_update [i] = true; |
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82 | tab_ufpt_depth [i] = reg_UFPT_UPDATE [i]; |
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83 | tab_upt_depth [i] = reg_UPT_UPDATE [i]; |
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84 | } |
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85 | |
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86 | for (uint32_t i=0; i<_param->_nb_inst_update; i++) |
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87 | { |
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88 | Tcontext_t context = (reg_UPDATE_PRIORITY+i)%_param->_nb_context; |
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89 | |
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90 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * UPDATE [%d] (genMoore)",i); |
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91 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * context : %d",context); |
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92 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * flush_ufpt : %d",flush_ufpt[context]); |
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93 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * flush_upt : %d",flush_upt [context]); |
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94 | |
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95 | Tcontrol_t val = false; |
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96 | Tcontrol_t val_without_ack = false; |
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97 | Tcontrol_t miss_prediction = 0; // not necessary init |
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98 | Tcontrol_t direction_good = 0; // not necessary init |
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99 | Tcontrol_t prediction_ifetch = 0; // not necessary init |
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100 | Tcontrol_t btb_val = 0; // not necessary init |
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101 | Taddress_t btb_address_src = 0; // not necessary init |
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102 | Taddress_t btb_address_dest = 0; // not necessary init |
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103 | Tbranch_condition_t btb_condition = 0; // not necessary init |
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104 | Tcontrol_t dir_val = 0; // not necessary init |
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105 | Thistory_t dir_history = 0; // not necessary init |
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106 | Tcontrol_t ras_val = 0; // not necessary init |
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107 | Tcontrol_t ras_flush = 0; // not necessary init |
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108 | Tcontrol_t ras_push = 0; // not necessary init |
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109 | Taddress_t ras_address = 0; // not necessary init |
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110 | Tptr_t ras_index = 0; // not necessary init |
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111 | |
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112 | // Test if update fetch prediction table need update port |
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113 | if (flush_ufpt [context]) |
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114 | { |
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115 | if (ufpt_can_update [context]) |
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116 | { |
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117 | // Update Fetch Prediction Table |
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118 | // An update of ufpt is to previous miss. Just restore Prediction_unit |
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119 | |
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120 | // Read information |
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121 | Tdepth_t depth = tab_ufpt_depth[context]; |
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122 | ufpt_state_t state = reg_UPDATE_FETCH_PREDICTION_TABLE [context][depth]._state; |
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123 | Tbranch_condition_t condition = reg_UPDATE_FETCH_PREDICTION_TABLE [context][depth]._condition; |
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124 | |
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125 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * Update Fetch Prediction Table"); |
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126 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * depth : %d",depth ); |
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127 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * state : %s",toString(state ).c_str()); |
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128 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * condition : %s",toString(condition).c_str()); |
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129 | |
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130 | val = (state == UPDATE_FETCH_PREDICTION_STATE_EVENT); |
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131 | // val_without_ack = not update_ras(condition); |
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132 | |
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133 | miss_prediction = 1; // need update, also previous miss |
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134 | // direction_good = ; |
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135 | prediction_ifetch = 1; |
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136 | btb_val = 0; // don't update btb (is update by the event branch) |
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137 | // btb_address_src = reg_UPDATE_PREDICTION_TABLE [context][depth]._address_src ; |
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138 | // btb_address_dest = reg_UPDATE_PREDICTION_TABLE [context][depth]._address_dest; |
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139 | // btb_condition = condition; |
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140 | dir_val = update_dir(condition); |
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141 | dir_history = reg_UPDATE_PREDICTION_TABLE [context][depth]._history; |
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142 | ras_val = update_ras(condition); // repop/ repush data -> don't corrupt ras |
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143 | ras_flush = 0; // no ras corruption |
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144 | ras_push = push_ras(condition); |
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145 | ras_address = reg_UPDATE_FETCH_PREDICTION_TABLE [context][depth]._address_ras; |
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146 | ras_index = reg_UPDATE_FETCH_PREDICTION_TABLE [context][depth]._index_ras; |
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147 | |
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148 | internal_UPDATE_FROM_UFPT [i] = true; |
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149 | internal_UPDATE_DEPTH [i] = depth; |
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150 | internal_UPDATE_RAS [i] = false; |
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151 | |
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152 | // Warning : don't update same entry |
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153 | if (depth == reg_UFPT_BOTTOM[context]) |
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154 | ufpt_can_update [context] = false; |
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155 | else |
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156 | // update pointer |
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157 | tab_ufpt_depth[context] = ((depth==0)?_param->_size_ufpt_queue[context]:depth)-1; |
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158 | } |
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159 | } |
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160 | else |
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161 | { |
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162 | if (upt_can_update [context]) |
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163 | { |
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164 | // Update Prediction Table |
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165 | |
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166 | // Read information |
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167 | Tdepth_t depth = tab_upt_depth[context]; |
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168 | upt_state_t state = reg_UPDATE_PREDICTION_TABLE [context][depth]._state; |
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169 | Tbranch_condition_t condition = reg_UPDATE_PREDICTION_TABLE [context][depth]._condition; |
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170 | Tcontrol_t ifetch = reg_UPDATE_PREDICTION_TABLE [context][depth]._ifetch_prediction; |
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171 | |
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172 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * Update Prediction Table"); |
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173 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * depth : %d",depth ); |
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174 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * state : %s",toString(state ).c_str()); |
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175 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * condition : %s",toString(condition).c_str()); |
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176 | |
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177 | // is the valid branch (valid branch hit, or valid branch miss) |
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178 | Tcontrol_t state_is_ok_ko = ((state == UPDATE_PREDICTION_STATE_OK ) or |
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179 | (state == UPDATE_PREDICTION_STATE_KO )); |
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180 | |
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181 | if (not flush_upt [context]) |
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182 | { |
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183 | // no event, just update predictor |
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184 | val = (state == UPDATE_PREDICTION_STATE_OK); |
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185 | val_without_ack = false; |
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186 | } |
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187 | else |
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188 | { |
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189 | // event, restore event (if need update) |
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190 | val = ( (state == UPDATE_PREDICTION_STATE_KO ) or |
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191 | ((state == UPDATE_PREDICTION_STATE_EVENT) and need_update(condition))); |
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192 | val_without_ack = ( (state == UPDATE_PREDICTION_STATE_EVENT) and not need_update(condition)); |
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193 | } |
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194 | |
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195 | miss_prediction = (state != UPDATE_PREDICTION_STATE_OK); |
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196 | direction_good = reg_UPDATE_PREDICTION_TABLE [context][depth]._good_take ; |
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197 | prediction_ifetch = ifetch; |
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198 | btb_val = state_is_ok_ko and update_btb(condition); |
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199 | btb_address_src = reg_UPDATE_PREDICTION_TABLE [context][depth]._address_src ; |
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200 | btb_address_dest = reg_UPDATE_PREDICTION_TABLE [context][depth]._address_dest; |
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201 | btb_condition = condition; |
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202 | dir_val = ifetch and update_dir(condition); // if not ifetch, then static prediction -> history is wrong |
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203 | dir_history = reg_UPDATE_PREDICTION_TABLE [context][depth]._history ; |
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204 | ras_val = update_ras(condition); // repop/ repush data -> don't corrupt ras |
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205 | ras_flush = (state == UPDATE_PREDICTION_STATE_KO); // miss prediction on RAS -> RAS is corrupted |
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206 | ras_push = push_ras(condition); |
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207 | // If corrupt, RAS must be flushed. |
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208 | // Also, if instruction l.jal, l.jalr, push addr+2 (delay slot), else (no flush) restore RAS |
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209 | ras_address = (ras_flush)?(reg_UPDATE_PREDICTION_TABLE [context][depth]._address_src+2):reg_UPDATE_PREDICTION_TABLE [context][depth]._address_ras; |
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210 | ras_index = reg_UPDATE_PREDICTION_TABLE [context][depth]._index_ras; |
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211 | |
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212 | internal_UPDATE_FROM_UFPT [i] = false; |
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213 | internal_UPDATE_DEPTH [i] = depth; |
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214 | internal_UPDATE_RAS [i] = flush_upt [context]; |
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215 | |
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216 | // Warning : don't update same entry |
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217 | if (flush_upt [context]) |
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218 | { |
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219 | // Stop condition |
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220 | if ((depth == reg_UPT_BOTTOM[context]) or not (val or val_without_ack)) |
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221 | upt_can_update [context] = false; |
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222 | |
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223 | // flush -> ptr is decrease |
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224 | tab_upt_depth[context] = (depth==0)?(_param->_size_upt_queue[context]-1):(depth-1); |
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225 | } |
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226 | else |
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227 | { |
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228 | // Stop condition |
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229 | if ((depth == reg_UPT_TOP [context]) or not (val or val_without_ack)) |
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230 | upt_can_update [context] = false; |
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231 | |
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232 | // flush -> ptr is increase |
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233 | tab_upt_depth[context] = (depth+1)%_param->_size_upt_queue[context]; |
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234 | } |
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235 | } |
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236 | } |
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237 | |
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238 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * val : %d",val ); |
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239 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * val_without_ack : %d",val_without_ack); |
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240 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * miss_prediction : %d",miss_prediction); |
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241 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * direction_good : %d",direction_good ); |
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242 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * btb_val : %d",btb_val); |
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243 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * dir_val : %d",dir_val); |
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244 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * ras_val : %d",ras_val); |
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245 | |
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246 | internal_UPDATE_VAL [i] = val; |
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247 | internal_UPDATE_VAL_WITHOUT_ACK [i] = val_without_ack; |
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248 | internal_UPDATE_CONTEXT_ID [i] = context; |
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249 | |
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250 | if (val) |
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251 | { |
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252 | if (_param->_have_port_context_id) |
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253 | PORT_WRITE(out_UPDATE_CONTEXT_ID [i],context ); |
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254 | PORT_WRITE(out_UPDATE_MISS_PREDICTION [i],miss_prediction ); |
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255 | PORT_WRITE(out_UPDATE_DIRECTION_GOOD [i],direction_good ); |
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256 | PORT_WRITE(out_UPDATE_PREDICTION_IFETCH [i],prediction_ifetch ); |
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257 | PORT_WRITE(out_UPDATE_BTB_VAL [i],btb_val ); |
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258 | PORT_WRITE(out_UPDATE_BTB_ADDRESS_SRC [i],btb_address_src ); |
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259 | PORT_WRITE(out_UPDATE_BTB_ADDRESS_DEST [i],btb_address_dest ); |
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260 | PORT_WRITE(out_UPDATE_BTB_CONDITION [i],btb_condition ); |
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261 | PORT_WRITE(out_UPDATE_DIR_VAL [i],dir_val ); |
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262 | if (_param->_have_port_history) |
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263 | PORT_WRITE(out_UPDATE_DIR_HISTORY [i],dir_history ); |
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264 | PORT_WRITE(out_UPDATE_RAS_VAL [i],ras_val ); |
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265 | PORT_WRITE(out_UPDATE_RAS_FLUSH [i],ras_flush ); |
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266 | PORT_WRITE(out_UPDATE_RAS_PUSH [i],ras_push ); |
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267 | PORT_WRITE(out_UPDATE_RAS_ADDRESS [i],ras_address ); |
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268 | PORT_WRITE(out_UPDATE_RAS_INDEX [i],ras_index ); |
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269 | } |
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270 | } |
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271 | } |
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272 | |
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273 | // =================================================================== |
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274 | // =====[ BRANCH_EVENT ]============================================== |
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275 | // =================================================================== |
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276 | |
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277 | // For all context ... |
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278 | for (uint32_t i=0; i<_param->_nb_context; i++) |
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279 | { |
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280 | // ... send an event if upt must be update the context |
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281 | Tcontrol_t val = ((reg_UPT_EVENT_STATE [i] == UPT_EVENT_STATE_KO_DECODE_UPDATE_CONTEXT) or |
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282 | (reg_UPT_EVENT_STATE [i] == UPT_EVENT_STATE_KO_COMMIT_UPDATE_CONTEXT)); |
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283 | if (_param->_have_port_depth) |
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284 | PORT_WRITE(out_BRANCH_EVENT_DEPTH [i],reg_EVENT_DEPTH [i]); |
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285 | PORT_WRITE(out_BRANCH_EVENT_ADDRESS_SRC [i],reg_EVENT_ADDRESS_SRC [i]); |
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286 | PORT_WRITE(out_BRANCH_EVENT_ADDRESS_DEST_VAL [i],reg_EVENT_ADDRESS_DEST_VAL [i]); |
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287 | PORT_WRITE(out_BRANCH_EVENT_ADDRESS_DEST [i],reg_EVENT_ADDRESS_DEST [i]); |
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288 | PORT_WRITE(out_BRANCH_EVENT_CAN_CONTINUE [i],reg_EVENT_CAN_CONTINUE [i]); |
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289 | |
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290 | internal_BRANCH_EVENT_VAL [i] = val; |
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291 | } |
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292 | |
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293 | } |
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294 | else |
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295 | { |
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296 | // Reset |
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297 | for (uint32_t i=0; i<_param->_nb_inst_update; i++) |
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298 | { |
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299 | internal_UPDATE_VAL [i] = 0; |
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300 | internal_UPDATE_VAL_WITHOUT_ACK [i] = 0; |
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301 | internal_UPDATE_CONTEXT_ID [i] = 0; |
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302 | |
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303 | } |
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304 | for (uint32_t i=0; i<_param->_nb_context; i++) |
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305 | { |
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306 | internal_BRANCH_EVENT_VAL [i] = 0; |
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307 | } |
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308 | } |
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309 | |
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310 | // Write output |
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311 | for (uint32_t i=0; i<_param->_nb_inst_update; i++) |
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312 | PORT_WRITE(out_UPDATE_VAL [i],internal_UPDATE_VAL [i]); |
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313 | for (uint32_t i=0; i<_param->_nb_context; i++) |
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314 | PORT_WRITE(out_BRANCH_EVENT_VAL [i],internal_BRANCH_EVENT_VAL [i]); |
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315 | |
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316 | log_end(Update_Prediction_Table,FUNCTION); |
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317 | }; |
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318 | |
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319 | }; // end namespace update_prediction_table |
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320 | }; // end namespace prediction_unit |
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321 | }; // end namespace front_end |
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322 | }; // end namespace multi_front_end |
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323 | }; // end namespace core |
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324 | |
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325 | }; // end namespace behavioural |
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326 | }; // end namespace morpheo |
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327 | #endif |
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