1 | #ifdef SYSTEMC |
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2 | /* |
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3 | * $Id: Update_Prediction_Table_transition.cpp 95 2008-12-16 16:24:26Z rosiere $ |
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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 | #undef FUNCTION |
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20 | #define FUNCTION "Update_Prediction_Table::transition" |
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21 | void Update_Prediction_Table::transition (void) |
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22 | { |
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23 | log_begin(Update_Prediction_Table,FUNCTION); |
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24 | log_function(Update_Prediction_Table,FUNCTION,_name.c_str()); |
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25 | |
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26 | if (PORT_READ(in_NRESET) == 0) |
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27 | { |
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28 | // Initialisation |
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29 | |
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30 | reg_UPDATE_PRIORITY = 0; |
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31 | |
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32 | // All pointer is set at 0 |
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33 | for (uint32_t i=0; i<_param->_nb_context; i++) |
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34 | { |
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35 | for (uint32_t j=0; j<_param->_size_ufpt_queue[i]; ++j) |
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36 | reg_UPDATE_FETCH_PREDICTION_TABLE [i][j]._state = UPDATE_FETCH_PREDICTION_STATE_EMPTY; |
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37 | reg_UFPT_BOTTOM [i] = 0; |
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38 | reg_UFPT_TOP [i] = 0; |
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39 | reg_UFPT_UPDATE [i] = 0; |
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40 | reg_UFPT_NB_NEED_UPDATE [i] = 0; |
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41 | |
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42 | for (uint32_t j=0; j<_param->_size_upt_queue[i]; ++j) |
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43 | reg_UPDATE_PREDICTION_TABLE [i][j]._state = UPDATE_PREDICTION_STATE_EMPTY; |
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44 | reg_UPT_BOTTOM [i] = 0; |
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45 | reg_UPT_TOP [i] = 0; |
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46 | reg_UPT_TOP_EVENT [i] = 0; |
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47 | reg_UPT_UPDATE [i] = 0; |
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48 | |
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49 | reg_IS_ACCURATE [i] = true; |
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50 | |
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51 | reg_EVENT_STATE [i] = EVENT_STATE_OK; |
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52 | } |
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53 | } |
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54 | else |
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55 | { |
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56 | bool flush_UFPT [_param->_nb_context]; |
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57 | for (uint32_t i=0; i<_param->_nb_context; i++) |
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58 | flush_UFPT [i] = false; |
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59 | |
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60 | // =================================================================== |
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61 | // =====[ GARBAGE COLLECTOR ]========================================= |
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62 | // =================================================================== |
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63 | |
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64 | // Each cycle, if the most lastest branch have update all prediction struction (state = end), free this slot |
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65 | // * Update state -> new status is "empty" |
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66 | // * Update pointer (bottom and accurate) |
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67 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * GARBAGE COLLECTOR"); |
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68 | for (uint32_t i=0; i<_param->_nb_context; i++) |
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69 | { |
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70 | // UPDATE_FETCH_PREDICTION_TABLE |
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71 | { |
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72 | uint32_t bottom = reg_UFPT_BOTTOM [i]; |
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73 | |
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74 | // Test if state is end |
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75 | if (reg_UPDATE_FETCH_PREDICTION_TABLE [i][bottom]._state == UPDATE_FETCH_PREDICTION_STATE_END) |
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76 | { |
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77 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * UFPT [%d][%d]",i,bottom); |
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78 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * UFPT [%d][%d].state = UPDATE_FETCH_PREDICTION_STATE_EMPTY",i,bottom); |
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79 | |
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80 | // Free slot |
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81 | reg_UPDATE_FETCH_PREDICTION_TABLE [i][bottom]._state = UPDATE_FETCH_PREDICTION_STATE_EMPTY; |
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82 | // Update pointer |
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83 | reg_UFPT_BOTTOM [i] = (bottom+1)%_param->_size_ufpt_queue[i]; |
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84 | } |
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85 | } |
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86 | |
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87 | // UPDATE_PREDICTION_TABLE |
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88 | { |
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89 | uint32_t bottom = reg_UPT_BOTTOM [i]; |
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90 | bool end_ok = (reg_UPDATE_PREDICTION_TABLE [i][bottom]._state == UPDATE_PREDICTION_STATE_END_OK); |
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91 | bool end_ko = (reg_UPDATE_PREDICTION_TABLE [i][bottom]._state == UPDATE_PREDICTION_STATE_END_KO); |
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92 | |
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93 | // Test if state is end |
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94 | if (end_ok or end_ko) |
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95 | { |
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96 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * UPT [%d][%d]",i,bottom); |
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97 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * UPT [%d][%d]._state = UPDATE_PREDICTION_STATE_EMPTY",i,bottom); |
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98 | |
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99 | // Free slot |
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100 | reg_UPDATE_PREDICTION_TABLE [i][bottom]._state = UPDATE_PREDICTION_STATE_EMPTY; |
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101 | |
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102 | // Update pointer |
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103 | reg_UPT_BOTTOM [i] = (bottom+1)%_param->_size_upt_queue[i]; |
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104 | // if (bottom = reg_UPT_UPDATE [i]) |
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105 | // reg_UPT_UPDATE [i] = reg_UPT_BOTTOM [i]; |
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106 | if (end_ko) // free |
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107 | { |
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108 | reg_UPT_TOP [i] = reg_UPT_TOP_EVENT [i]; |
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109 | reg_UPT_UPDATE [i] = reg_UPT_TOP_EVENT [i]; |
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110 | } |
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111 | } |
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112 | } |
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113 | } |
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114 | |
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115 | // =================================================================== |
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116 | // =====[ PREDICT ]=================================================== |
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117 | // =================================================================== |
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118 | |
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119 | // An ifetch_unit compute next cycle and have an branch : predict_val is set |
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120 | // * Alloc new entry -> new status is "wait decod" |
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121 | // * Save input (to restore in miss or error) |
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122 | // * Update pointer |
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123 | |
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124 | for (uint32_t i=0; i<_param->_nb_inst_predict; i++) |
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125 | if (PORT_READ(in_PREDICT_VAL[i]) and internal_PREDICT_ACK [i]) |
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126 | { |
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127 | Tcontext_t context = (_param->_have_port_context_id)?PORT_READ(in_PREDICT_CONTEXT_ID [i]):0; |
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128 | uint32_t top = internal_PREDICT_UPDATE_PREDICTION_ID [i]; |
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129 | |
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130 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * PREDICT[%d] - Accepted",i); |
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131 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * context : %d",context); |
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132 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * top : %d",top); |
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133 | |
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134 | #ifdef DEBUG_TEST |
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135 | if (reg_UPDATE_FETCH_PREDICTION_TABLE [context][top]._state != UPDATE_FETCH_PREDICTION_STATE_EMPTY) |
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136 | throw ERRORMORPHEO(FUNCTION,_("Predict : invalid state.")); |
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137 | #endif |
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138 | |
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139 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * UFPT [%d][%d].state <- UPDATE_FETCH_PREDICTION_STATE_WAIT_DECOD (predict)",context,top); |
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140 | reg_UPDATE_FETCH_PREDICTION_TABLE [context][top]._state = UPDATE_FETCH_PREDICTION_STATE_WAIT_DECOD; |
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141 | |
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142 | Tbranch_condition_t condition = PORT_READ(in_PREDICT_BTB_CONDITION [i]); |
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143 | |
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144 | reg_UPDATE_FETCH_PREDICTION_TABLE [context][top]._condition = condition; |
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145 | reg_UPDATE_FETCH_PREDICTION_TABLE [context][top]._address_src = PORT_READ(in_PREDICT_BTB_ADDRESS_SRC [i]); |
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146 | reg_UPDATE_FETCH_PREDICTION_TABLE [context][top]._address_dest = PORT_READ(in_PREDICT_BTB_ADDRESS_DEST [i]); |
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147 | reg_UPDATE_FETCH_PREDICTION_TABLE [context][top]._last_take = PORT_READ(in_PREDICT_BTB_LAST_TAKE [i]); |
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148 | reg_UPDATE_FETCH_PREDICTION_TABLE [context][top]._is_accurate = PORT_READ(in_PREDICT_BTB_IS_ACCURATE [i]); |
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149 | reg_UPDATE_FETCH_PREDICTION_TABLE [context][top]._history = (_param->_have_port_history)?PORT_READ(in_PREDICT_DIR_HISTORY [i]):0; |
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150 | reg_UPDATE_FETCH_PREDICTION_TABLE [context][top]._address_ras = PORT_READ(in_PREDICT_RAS_ADDRESS [i]); |
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151 | reg_UPDATE_FETCH_PREDICTION_TABLE [context][top]._index_ras = PORT_READ(in_PREDICT_RAS_INDEX [i]); |
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152 | |
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153 | reg_UFPT_TOP [context] = (top+1)%_param->_size_ufpt_queue [context]; |
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154 | // reg_UFPT_UPDATE [context] = reg_UFPT_TOP [context]; |
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155 | if (need_update(condition)) |
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156 | reg_UFPT_NB_NEED_UPDATE [context] ++; |
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157 | } |
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158 | |
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159 | // =================================================================== |
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160 | // =====[ DECOD ]===================================================== |
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161 | // =================================================================== |
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162 | |
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163 | |
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164 | // An decod is detected by decod stage |
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165 | // 1) Hit prediction : The instruction bundle have a branch predicted in ifetch stage and it is this branch |
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166 | // * Update state, wait_decod -> wait_end |
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167 | // * Pop ufpt -> push upt |
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168 | // * Update accurate register : if the predict stage have tagged this branch as not accurate, stop decod |
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169 | // 2) Miss : The instruction bundle have a branch but it is not predicted |
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170 | // * Flush ufpt |
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171 | // * decod information is write in upt |
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172 | |
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173 | for (uint32_t i=0; i<_param->_nb_inst_decod; i++) |
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174 | if (PORT_READ(in_DECOD_VAL[i]) and internal_DECOD_ACK [i]) |
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175 | { |
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176 | Tcontext_t context = (_param->_have_port_context_id)?PORT_READ(in_DECOD_CONTEXT_ID [i]):0; |
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177 | Tcontrol_t miss_ifetch = PORT_READ(in_DECOD_MISS_IFETCH [i]); |
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178 | Tcontrol_t miss_decod = PORT_READ(in_DECOD_MISS_DECOD [i]); |
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179 | uint32_t upt_ptr_write = internal_DECOD_UPT_PTR_WRITE [i]; |
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180 | Tbranch_condition_t condition ; |
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181 | Tcontrol_t is_accurate; |
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182 | Taddress_t address_src = PORT_READ(in_DECOD_BTB_ADDRESS_SRC [i]); |
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183 | Taddress_t address_dest = PORT_READ(in_DECOD_BTB_ADDRESS_DEST [i]); |
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184 | Tcontrol_t last_take = PORT_READ(in_DECOD_BTB_LAST_TAKE [i]); |
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185 | |
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186 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * DECOD[%d] - Accepted",i); |
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187 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * context : %d",context); |
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188 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * miss_ifetch : %d",miss_ifetch); |
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189 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * miss_decod : %d",miss_decod); |
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190 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * upt_ptr_write : %d",upt_ptr_write); |
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191 | |
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192 | if (miss_ifetch or miss_decod) |
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193 | { |
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194 | // Have a miss !!! |
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195 | #ifdef DEBUG_TEST |
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196 | if (reg_EVENT_STATE [context] != EVENT_STATE_OK) |
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197 | throw ERRORMORPHEO(FUNCTION,_("Decod : invalid event state.")); |
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198 | #endif |
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199 | |
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200 | if (reg_UFPT_NB_NEED_UPDATE [context] == 0) |
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201 | { |
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202 | // Change state |
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203 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * EVENT [%d] <- EVENT_STATE_UPDATE_CONTEXT (decod - miss - no flush ufpt)",context); |
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204 | reg_EVENT_STATE [context] = EVENT_STATE_UPDATE_CONTEXT; |
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205 | } |
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206 | else |
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207 | { |
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208 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * EVENT [%d] <- EVENT_STATE_FLUSH_UFPT (decod - miss - flush ufpt)",context); |
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209 | reg_EVENT_STATE [context] = EVENT_STATE_FLUSH_UFPT; |
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210 | } |
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211 | |
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212 | // Flush UPFT |
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213 | flush_UFPT [context] = true; |
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214 | |
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215 | reg_EVENT_ADDRESS_SRC [context] = address_src; // delay_slot is compute in Context_State |
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216 | reg_EVENT_ADDRESS_DEST_VAL[context] = last_take; |
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217 | reg_EVENT_ADDRESS_DEST [context] = address_dest; |
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218 | |
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219 | // Push upt (from decod interface) |
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220 | condition = PORT_READ(in_DECOD_BTB_CONDITION [i]); |
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221 | is_accurate = PORT_READ(in_DECOD_IS_ACCURATE [i]); |
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222 | |
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223 | reg_UPDATE_PREDICTION_TABLE [context][upt_ptr_write]._condition = condition; |
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224 | reg_UPDATE_PREDICTION_TABLE [context][upt_ptr_write]._address_src = address_src ; |
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225 | reg_UPDATE_PREDICTION_TABLE [context][upt_ptr_write]._address_dest = address_dest; |
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226 | reg_UPDATE_PREDICTION_TABLE [context][upt_ptr_write]._last_take = last_take ; |
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227 | // reg_UPDATE_PREDICTION_TABLE [context][upt_ptr_write]._good_take; |
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228 | reg_UPDATE_PREDICTION_TABLE [context][upt_ptr_write]._is_accurate = is_accurate; |
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229 | // reg_UPDATE_PREDICTION_TABLE [context][upt_ptr_write]._history = ; // static prediction |
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230 | reg_UPDATE_PREDICTION_TABLE [context][upt_ptr_write]._address_ras = PORT_READ(in_DECOD_RAS_ADDRESS [i]); |
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231 | reg_UPDATE_PREDICTION_TABLE [context][upt_ptr_write]._index_ras = PORT_READ(in_DECOD_RAS_INDEX [i]); |
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232 | reg_UPDATE_PREDICTION_TABLE [context][upt_ptr_write]._ifetch_prediction = false; // static prediction |
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233 | } |
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234 | else |
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235 | { |
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236 | // Normal case : branch is previous predicated, change state of branch |
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237 | uint32_t ufpt_ptr_read = (_param->_have_port_depth)?PORT_READ(in_DECOD_UPDATE_PREDICTION_ID [i]):0; |
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238 | |
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239 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * ufpt_ptr_read : %d",ufpt_ptr_read); |
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240 | |
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241 | #ifdef DEBUG_TEST |
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242 | if (reg_UPDATE_FETCH_PREDICTION_TABLE [context][ufpt_ptr_read]._state != UPDATE_FETCH_PREDICTION_STATE_WAIT_DECOD) |
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243 | throw ERRORMORPHEO(FUNCTION,_("Decod : invalid ufpt state.")); |
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244 | #endif |
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245 | // Change state |
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246 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * UFPT [%d][%d].state <- UPDATE_FETCH_PREDICTION_STATE_END (decod - hit)",context,ufpt_ptr_read); |
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247 | reg_UPDATE_FETCH_PREDICTION_TABLE [context][ufpt_ptr_read]._state = UPDATE_FETCH_PREDICTION_STATE_END; |
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248 | |
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249 | // Push upt (from Pop ufpt) |
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250 | condition = reg_UPDATE_FETCH_PREDICTION_TABLE [context][ufpt_ptr_read]._condition; |
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251 | is_accurate = reg_UPDATE_FETCH_PREDICTION_TABLE [context][ufpt_ptr_read]._is_accurate; |
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252 | |
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253 | reg_UPDATE_PREDICTION_TABLE [context][upt_ptr_write]._condition = condition; |
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254 | reg_UPDATE_PREDICTION_TABLE [context][upt_ptr_write]._address_src = reg_UPDATE_FETCH_PREDICTION_TABLE [context][ufpt_ptr_read]._address_src ; |
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255 | reg_UPDATE_PREDICTION_TABLE [context][upt_ptr_write]._address_dest = reg_UPDATE_FETCH_PREDICTION_TABLE [context][ufpt_ptr_read]._address_dest; |
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256 | reg_UPDATE_PREDICTION_TABLE [context][upt_ptr_write]._last_take = reg_UPDATE_FETCH_PREDICTION_TABLE [context][ufpt_ptr_read]._last_take ; |
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257 | // reg_UPDATE_PREDICTION_TABLE [context][upt_ptr_write]._good_take; |
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258 | reg_UPDATE_PREDICTION_TABLE [context][upt_ptr_write]._is_accurate = is_accurate; |
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259 | reg_UPDATE_PREDICTION_TABLE [context][upt_ptr_write]._history = reg_UPDATE_FETCH_PREDICTION_TABLE [context][ufpt_ptr_read]._history ; |
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260 | reg_UPDATE_PREDICTION_TABLE [context][upt_ptr_write]._address_ras = reg_UPDATE_FETCH_PREDICTION_TABLE [context][ufpt_ptr_read]._address_ras ; |
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261 | reg_UPDATE_PREDICTION_TABLE [context][upt_ptr_write]._index_ras = reg_UPDATE_FETCH_PREDICTION_TABLE [context][ufpt_ptr_read]._index_ras ; |
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262 | reg_UPDATE_PREDICTION_TABLE [context][upt_ptr_write]._ifetch_prediction = true; // prediction from ifetch |
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263 | |
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264 | // Update pointer |
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265 | if (need_update(condition)) |
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266 | { |
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267 | reg_UFPT_NB_NEED_UPDATE [context] --; |
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268 | } |
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269 | } |
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270 | |
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271 | // All case !!! |
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272 | |
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273 | #ifdef DEBUG_TEST |
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274 | if (reg_UPDATE_PREDICTION_TABLE [context][upt_ptr_write]._state != UPDATE_PREDICTION_STATE_EMPTY) |
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275 | throw ERRORMORPHEO(FUNCTION,_("Decod : invalid upt state.")); |
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276 | #endif |
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277 | |
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278 | // Change state |
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279 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * UPT [%d][%d].state <- UPDATE_PREDICTION_STATE_WAIT_END (decod - hit)",context,upt_ptr_write); |
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280 | reg_UPDATE_PREDICTION_TABLE [context][upt_ptr_write]._state = UPDATE_PREDICTION_STATE_WAIT_END; |
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281 | |
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282 | // Write new accurate |
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283 | #ifdef DEBUG_TEST |
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284 | if (not reg_IS_ACCURATE [context] and not is_accurate) |
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285 | throw ERRORMORPHEO(FUNCTION,_("Decod : invalid accurate flag.")); |
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286 | #endif |
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287 | reg_IS_ACCURATE [context] = is_accurate; |
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288 | |
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289 | // Update pointer |
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290 | reg_UPT_TOP [context] = (upt_ptr_write+1)%_param->_size_upt_queue [context]; |
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291 | // reg_UPT_UPDATE [context] = reg_UPT_TOP [context]; |
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292 | } |
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293 | |
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294 | // =================================================================== |
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295 | // =====[ BRANCH_COMPLETE ]=========================================== |
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296 | // =================================================================== |
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297 | |
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298 | // The branch is complete |
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299 | // * Hit prediction : |
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300 | // * update status |
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301 | // * Miss prediction : |
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302 | for (uint32_t i=0; i<_param->_nb_inst_branch_complete; i++) |
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303 | if (PORT_READ(in_BRANCH_COMPLETE_VAL[i]) and internal_BRANCH_COMPLETE_ACK [i]) |
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304 | { |
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305 | Tcontext_t context = (_param->_have_port_context_id)?PORT_READ(in_BRANCH_COMPLETE_CONTEXT_ID [i]):0; |
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306 | Tdepth_t depth = (_param->_have_port_depth )?PORT_READ(in_BRANCH_COMPLETE_DEPTH [i]):0; |
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307 | Tcontrol_t miss = internal_BRANCH_COMPLETE_MISS_PREDICTION [i]; |
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308 | Tcontrol_t good_take = internal_BRANCH_COMPLETE_TAKE [i]; |
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309 | Taddress_t good_addr = internal_BRANCH_COMPLETE_ADDRESS_DEST [i]; |
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310 | |
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311 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * BRANCH_COMPLETE[%d] - Accepted",i); |
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312 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * context : %d",context); |
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313 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * depth : %d",depth); |
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314 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * miss : %d",miss); |
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315 | |
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316 | if (miss) |
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317 | { |
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318 | // Have a miss !!! |
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319 | // Flush UPFT |
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320 | flush_UFPT [context] = true; |
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321 | |
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322 | // Flush UPT |
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323 | uint32_t top = reg_UPT_TOP [context]; |
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324 | uint32_t new_update = ((top==0)?_param->_size_upt_queue[context]:top)-1; |
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325 | |
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326 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * top : %d",top); |
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327 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * new_update : %d",new_update); |
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328 | |
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329 | for (uint32_t j=(depth+1)%_param->_size_upt_queue[context]; |
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330 | j!=top; |
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331 | j=(j+1)%_param->_size_upt_queue[context]) |
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332 | reg_UPDATE_PREDICTION_TABLE [context][j]._state = UPDATE_PREDICTION_STATE_EVENT; |
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333 | |
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334 | |
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335 | // reg_UPT_BOTTOM [context]; |
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336 | reg_UPT_TOP [context] = depth; |
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337 | reg_UPT_TOP_EVENT [context] = top; |
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338 | |
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339 | #ifdef DEBUG_TEST |
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340 | if (reg_UPDATE_PREDICTION_TABLE [context][depth]._state != UPDATE_PREDICTION_STATE_WAIT_END) |
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341 | throw ERRORMORPHEO(FUNCTION,_("Branch complete : invalid upt state.")); |
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342 | #endif |
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343 | |
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344 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * UPT [%d][%d].state <- UPDATE_PREDICTION_STATE_KO (branch_complete, ifetch hit)",context,depth); |
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345 | reg_UPDATE_PREDICTION_TABLE [context][depth]._state = UPDATE_PREDICTION_STATE_KO; |
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346 | |
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347 | Taddress_t address_src = reg_UPDATE_PREDICTION_TABLE [context][depth]._address_src; |
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348 | event_state_t event_state = reg_EVENT_STATE [context]; |
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349 | bool previous_update_ras = (event_state == EVENT_STATE_FLUSH_UPT); |
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350 | bool update_ras = (new_update != depth); |
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351 | |
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352 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * update_ras : %d",update_ras); |
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353 | |
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354 | if (reg_UFPT_NB_NEED_UPDATE [context] > 0) |
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355 | { |
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356 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * EVENT [%d] <- EVENT_STATE_FLUSH_UFPT_AND_UPT (branch_complete - miss)",context); |
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357 | reg_EVENT_STATE [context] = EVENT_STATE_FLUSH_UFPT_AND_UPT; |
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358 | } |
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359 | else |
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360 | { |
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361 | if (not previous_update_ras) |
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362 | { |
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363 | // have ras prediction ? |
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364 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * EVENT [%d] <- EVENT_STATE_FLUSH_UPT (branch_complete - miss)",context); |
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365 | |
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366 | reg_EVENT_STATE [context] = EVENT_STATE_FLUSH_UPT; |
---|
367 | |
---|
368 | } |
---|
369 | } |
---|
370 | |
---|
371 | if (not previous_update_ras) |
---|
372 | { |
---|
373 | reg_UPT_UPDATE [context] = new_update; |
---|
374 | } |
---|
375 | // else no update |
---|
376 | |
---|
377 | reg_EVENT_ADDRESS_SRC [context] = address_src; // delay_slot is compute in Context_State |
---|
378 | reg_EVENT_ADDRESS_DEST_VAL[context] = good_take; |
---|
379 | reg_EVENT_ADDRESS_DEST [context] = good_addr; |
---|
380 | } |
---|
381 | else |
---|
382 | { |
---|
383 | // Hit case |
---|
384 | |
---|
385 | #ifdef DEBUG_TEST |
---|
386 | if (reg_UPDATE_PREDICTION_TABLE [context][depth]._state != UPDATE_PREDICTION_STATE_WAIT_END) |
---|
387 | throw ERRORMORPHEO(FUNCTION,_("Branch complete : invalid upt state.")); |
---|
388 | #endif |
---|
389 | |
---|
390 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * UPT [%d][%d].state <- UPDATE_PREDICTION_STATE_OK (branch_complete, ifetch hit)",context,depth); |
---|
391 | reg_UPDATE_PREDICTION_TABLE [context][depth]._state = UPDATE_PREDICTION_STATE_OK; |
---|
392 | } |
---|
393 | |
---|
394 | // In all case : update good_take |
---|
395 | reg_UPDATE_PREDICTION_TABLE [context][depth]._good_take = good_take; |
---|
396 | } |
---|
397 | |
---|
398 | // =================================================================== |
---|
399 | // =====[ UPDATE ]==================================================== |
---|
400 | // =================================================================== |
---|
401 | { |
---|
402 | bool can_continue [_param->_nb_context]; |
---|
403 | for (uint32_t i=0; i<_param->_nb_context; ++i) |
---|
404 | can_continue [i] = true; |
---|
405 | |
---|
406 | for (uint32_t i=0; i<_param->_nb_inst_update; i++) |
---|
407 | { |
---|
408 | Tcontext_t context = internal_UPDATE_CONTEXT_ID [i]; |
---|
409 | |
---|
410 | if ((internal_UPDATE_VAL[i] and PORT_READ(in_UPDATE_ACK [i])) or |
---|
411 | (internal_UPDATE_VAL_WITHOUT_ACK [i] and can_continue [context])) |
---|
412 | { |
---|
413 | Tdepth_t depth = internal_UPDATE_DEPTH [i]; |
---|
414 | |
---|
415 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * UPDATE[%d] - Accepted",i); |
---|
416 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * context : %d",context); |
---|
417 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * depth : %d",depth); |
---|
418 | |
---|
419 | if (internal_UPDATE_FROM_UFPT [i]) |
---|
420 | { |
---|
421 | // if free a slot, also all queue is updated |
---|
422 | // Last slot ? |
---|
423 | if (reg_UFPT_UPDATE [context] == reg_UFPT_BOTTOM [context]) |
---|
424 | switch (reg_EVENT_STATE [context]) |
---|
425 | { |
---|
426 | case EVENT_STATE_FLUSH_UFPT : reg_EVENT_STATE [context] = EVENT_STATE_UPDATE_CONTEXT; break; |
---|
427 | // impossible to have an update on ufpt and reg_upt_update>reg_upt_top |
---|
428 | case EVENT_STATE_FLUSH_UFPT_AND_UPT : reg_EVENT_STATE [context] = EVENT_STATE_FLUSH_UPT ; break; |
---|
429 | default : break; |
---|
430 | } |
---|
431 | |
---|
432 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * Update Fetch Prediction Table"); |
---|
433 | |
---|
434 | // Change state |
---|
435 | #ifdef DEBUG_TEST |
---|
436 | if (reg_UPDATE_FETCH_PREDICTION_TABLE [context][depth]._state != UPDATE_FETCH_PREDICTION_STATE_EVENT) |
---|
437 | throw ERRORMORPHEO(FUNCTION,_("Update : invalid ufpt state.")); |
---|
438 | #endif |
---|
439 | |
---|
440 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * UFPT [%d][%d].state <- UPDATE_FETCH_PREDICTION_STATE_END (update)",context,depth); |
---|
441 | |
---|
442 | reg_UPDATE_FETCH_PREDICTION_TABLE [context][depth]._state = UPDATE_FETCH_PREDICTION_STATE_END; |
---|
443 | |
---|
444 | |
---|
445 | // Update pointer |
---|
446 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * reg_UFPT_UPDATE (before) : %d",reg_UFPT_UPDATE [context]); |
---|
447 | reg_UFPT_UPDATE [context] = ((depth==0)?_param->_size_ufpt_queue[context]:depth)-1; |
---|
448 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * reg_UFPT_UPDATE (after ) : %d",reg_UFPT_UPDATE [context]); |
---|
449 | // Free a register that need update ? |
---|
450 | if (need_update(reg_UPDATE_FETCH_PREDICTION_TABLE [context][depth]._condition)) |
---|
451 | reg_UFPT_NB_NEED_UPDATE [context] --; |
---|
452 | } |
---|
453 | else |
---|
454 | { |
---|
455 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * Update Prediction Table"); |
---|
456 | |
---|
457 | // Change state |
---|
458 | #ifdef DEBUG_TEST |
---|
459 | if (internal_UPDATE_RAS [i]) |
---|
460 | { |
---|
461 | if ((reg_UPDATE_PREDICTION_TABLE [context][depth]._state != UPDATE_PREDICTION_STATE_EVENT) and |
---|
462 | (reg_UPDATE_PREDICTION_TABLE [context][depth]._state != UPDATE_PREDICTION_STATE_KO )) |
---|
463 | throw ERRORMORPHEO(FUNCTION,_("Update : invalid upt state.")); |
---|
464 | } |
---|
465 | else |
---|
466 | { |
---|
467 | if (reg_UPDATE_PREDICTION_TABLE [context][depth]._state != UPDATE_PREDICTION_STATE_OK ) |
---|
468 | throw ERRORMORPHEO(FUNCTION,_("Update : invalid upt state.")); |
---|
469 | } |
---|
470 | #endif |
---|
471 | |
---|
472 | // bool have_event = ((reg_UPDATE_PREDICTION_TABLE [context][depth]._state == UPDATE_PREDICTION_STATE_KO) or |
---|
473 | // (reg_UPDATE_PREDICTION_TABLE [context][depth]._state == UPDATE_PREDICTION_STATE_EVENT)); |
---|
474 | bool ko = (reg_UPDATE_PREDICTION_TABLE [context][depth]._state == UPDATE_PREDICTION_STATE_KO); |
---|
475 | |
---|
476 | // Have an update, test the state to transiste to the good state |
---|
477 | if (ko) |
---|
478 | { |
---|
479 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * UPT [%d][%d].state <- UPDATE_PREDICTION_STATE_END_KO (update)",context,depth); |
---|
480 | |
---|
481 | reg_UPDATE_PREDICTION_TABLE [context][depth]._state = UPDATE_PREDICTION_STATE_END_KO; |
---|
482 | } |
---|
483 | else |
---|
484 | { |
---|
485 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * UPT [%d][%d].state <- UPDATE_PREDICTION_STATE_END_OK (update)",context,depth); |
---|
486 | |
---|
487 | reg_UPDATE_PREDICTION_TABLE [context][depth]._state = UPDATE_PREDICTION_STATE_END_OK; |
---|
488 | } |
---|
489 | |
---|
490 | // Update pointer |
---|
491 | // * if update RAS : update pointer is decreaste until it equal at top pointer |
---|
492 | if (internal_UPDATE_RAS [i]) |
---|
493 | { |
---|
494 | // if end_event, restart too bottom, else decrease pointer |
---|
495 | bool end_event = (reg_UPT_UPDATE [context] == reg_UPT_TOP [context]); |
---|
496 | |
---|
497 | reg_UPT_UPDATE [context] = (end_event)?reg_UPT_BOTTOM[context]:(((depth==0)?_param->_size_upt_queue[context]:depth)-1); |
---|
498 | if (end_event) |
---|
499 | { |
---|
500 | reg_UPT_UPDATE [context] = reg_UPT_BOTTOM[context]; |
---|
501 | reg_EVENT_STATE [context] = EVENT_STATE_UPDATE_CONTEXT; |
---|
502 | } |
---|
503 | else |
---|
504 | { |
---|
505 | reg_UPT_UPDATE [context] = (((depth==0)?_param->_size_upt_queue[context]:depth)-1); |
---|
506 | } |
---|
507 | } |
---|
508 | else |
---|
509 | { |
---|
510 | // increase pointer |
---|
511 | reg_UPT_UPDATE [context] = (depth+1)%_param->_size_upt_queue[context]; |
---|
512 | } |
---|
513 | |
---|
514 | // Free the branch with no accurate ? |
---|
515 | if (reg_UPDATE_PREDICTION_TABLE [context][depth]._is_accurate == false) |
---|
516 | reg_IS_ACCURATE [context] = true; |
---|
517 | } |
---|
518 | } |
---|
519 | else |
---|
520 | can_continue [context] = false; |
---|
521 | } |
---|
522 | |
---|
523 | // Round robin |
---|
524 | reg_UPDATE_PRIORITY = (reg_UPDATE_PRIORITY+1)%_param->_nb_context; |
---|
525 | } |
---|
526 | |
---|
527 | // =================================================================== |
---|
528 | // =====[ BRANCH_EVENT ]============================================== |
---|
529 | // =================================================================== |
---|
530 | for (uint32_t i=0; i<_param->_nb_context; i++) |
---|
531 | if (internal_BRANCH_EVENT_VAL [i] and PORT_READ(in_BRANCH_EVENT_ACK [i])) |
---|
532 | { |
---|
533 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * BRANCH_EVENT [%d] - Accepted",i); |
---|
534 | |
---|
535 | #ifdef DEBUG_TEST |
---|
536 | if (reg_EVENT_STATE [i] != EVENT_STATE_UPDATE_CONTEXT) |
---|
537 | throw ERRORMORPHEO(FUNCTION,_("Decod : invalid event state.")); |
---|
538 | #endif |
---|
539 | |
---|
540 | // Change state |
---|
541 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * EVENT [%d] <- EVENT_STATE_WAIT_END_EVENT (branch_event)",i); |
---|
542 | |
---|
543 | reg_EVENT_STATE [i] = EVENT_STATE_WAIT_END_EVENT; |
---|
544 | } |
---|
545 | |
---|
546 | // =================================================================== |
---|
547 | // =====[ EVENT ]===================================================== |
---|
548 | // =================================================================== |
---|
549 | for (uint32_t i=0; i<_param->_nb_context; ++i) |
---|
550 | { |
---|
551 | //---------------------------------------------------------------- |
---|
552 | // Cases |
---|
553 | //---------------------------------------------------------------- |
---|
554 | // * EVENT_TYPE_NONE - nothing |
---|
555 | // * EVENT_TYPE_MISS_SPECULATION |
---|
556 | // * EVENT_STATE_END - Change state, reset pointer |
---|
557 | // * EVENT_TYPE_EXCEPTION - |
---|
558 | // * EVENT_STATE_EVENT - Flush upft and upt |
---|
559 | // * EVENT_STATE_END - Change state, reset pointer |
---|
560 | // * EVENT_TYPE_BRANCH_NO_ACCURATE - nothing : manage in decod and update |
---|
561 | // * EVENT_TYPE_SPR_ACCESS - nothing |
---|
562 | // * EVENT_TYPE_MSYNC - nothing |
---|
563 | // * EVENT_TYPE_PSYNC - nothing |
---|
564 | // * EVENT_TYPE_CSYNC - nothing |
---|
565 | |
---|
566 | Tevent_state_t event_state = PORT_READ(in_EVENT_STATE [i]); |
---|
567 | Tevent_type_t event_type = PORT_READ(in_EVENT_TYPE [i]); |
---|
568 | // Tdepth_t depth = PORT_READ(in_EVENT_DEPTH [i]); |
---|
569 | |
---|
570 | // Test if end of miss |
---|
571 | if ((event_state == EVENT_STATE_END) and |
---|
572 | (event_type == EVENT_TYPE_MISS_SPECULATION)) |
---|
573 | { |
---|
574 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * EVENT"); |
---|
575 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * state : EVENT_STATE_END"); |
---|
576 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * type : EVENT_TYPE_MISS_SPECULATION"); |
---|
577 | |
---|
578 | #ifdef DEBUG_TEST |
---|
579 | if (reg_EVENT_STATE [i] != EVENT_STATE_WAIT_END_EVENT) |
---|
580 | throw ERRORMORPHEO(FUNCTION,_("Event : invalid event state.")); |
---|
581 | #endif |
---|
582 | |
---|
583 | // Change state |
---|
584 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * EVENT [%d] <- EVENT_STATE_OK (event)",i); |
---|
585 | |
---|
586 | reg_EVENT_STATE [i] = EVENT_STATE_OK; |
---|
587 | |
---|
588 | // uint32_t bottom = reg_UPT_BOTTOM [i]; |
---|
589 | |
---|
590 | // reg_UPT_TOP [i] = bottom; |
---|
591 | // reg_UPT_UPDATE [i] = bottom; |
---|
592 | } |
---|
593 | } |
---|
594 | |
---|
595 | // =================================================================== |
---|
596 | // =====[ FLUSH ]===================================================== |
---|
597 | // =================================================================== |
---|
598 | |
---|
599 | for (uint32_t i=0; i<_param->_nb_context; ++i) |
---|
600 | { |
---|
601 | if (flush_UFPT [i]) |
---|
602 | { |
---|
603 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * Flush Update Fetch Prediction Table"); |
---|
604 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * context : %d",i); |
---|
605 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * reg_UFPT_NB_NEED_UPDATE : %d",reg_UFPT_NB_NEED_UPDATE [i]); |
---|
606 | |
---|
607 | // It's to accelerate miss speculation |
---|
608 | if (reg_UFPT_NB_NEED_UPDATE [i] == 0) |
---|
609 | { |
---|
610 | |
---|
611 | // No entry need prediction, flush all entry -> Reset |
---|
612 | for (uint32_t j=0; j<_param->_size_ufpt_queue[i]; ++j) |
---|
613 | reg_UPDATE_FETCH_PREDICTION_TABLE [i][j]._state = UPDATE_FETCH_PREDICTION_STATE_EMPTY; |
---|
614 | reg_UFPT_BOTTOM [i] = 0; |
---|
615 | reg_UFPT_TOP [i] = 0; |
---|
616 | // reg_UFPT_UPDATE [i]; |
---|
617 | } |
---|
618 | else |
---|
619 | { |
---|
620 | for (uint32_t j=0; j<_param->_size_ufpt_queue[i]; ++j) |
---|
621 | reg_UPDATE_FETCH_PREDICTION_TABLE [i][j]._state = UPDATE_FETCH_PREDICTION_STATE_EVENT; |
---|
622 | |
---|
623 | // TOP is next write slot : last slot is TOP-1 |
---|
624 | uint32_t top = reg_UFPT_TOP [i]; |
---|
625 | reg_UFPT_UPDATE [i] = ((top==0)?_param->_size_ufpt_queue[i]:top)-1; |
---|
626 | |
---|
627 | // reg_UFPT_BOTTOM [i]; |
---|
628 | // reg_UFPT_TOP [i]; |
---|
629 | } |
---|
630 | |
---|
631 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * reg_UFPT_UPDATE (after ) : %d",reg_UFPT_UPDATE [i]); |
---|
632 | |
---|
633 | } |
---|
634 | } |
---|
635 | |
---|
636 | // =================================================================== |
---|
637 | // =====[ PRINT ]===================================================== |
---|
638 | // =================================================================== |
---|
639 | |
---|
640 | #if (DEBUG >= DEBUG_TRACE) |
---|
641 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * Dump Update_Prediction_Table"); |
---|
642 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * reg_UPDATE_PRIORITY : %d",reg_UPDATE_PRIORITY); |
---|
643 | for (uint32_t i=0; i<_param->_nb_context; i++) |
---|
644 | { |
---|
645 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * reg_IS_ACCURATE : %d",reg_IS_ACCURATE [i]); |
---|
646 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * reg_EVENT_STATE : %s" ,toString(reg_EVENT_STATE [i]).c_str()); |
---|
647 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * reg_EVENT_ADDRESS_SRC : %.8x",reg_EVENT_ADDRESS_SRC [i]); |
---|
648 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * reg_EVENT_ADDRESS_DEST_VAL: %d" ,reg_EVENT_ADDRESS_DEST_VAL[i]); |
---|
649 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * reg_EVENT_ADDRESS_DEST : %.8x",reg_EVENT_ADDRESS_DEST [i]); |
---|
650 | |
---|
651 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * Update_Fetch_Prediction_Table [%d]",i); |
---|
652 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * reg_UFPT_BOTTOM : %d",reg_UFPT_BOTTOM [i]); |
---|
653 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * reg_UFPT_TOP : %d",reg_UFPT_TOP [i]); |
---|
654 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * reg_UFPT_UPDATE : %d",reg_UFPT_UPDATE [i]); |
---|
655 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * reg_UFPT_NB_NEED_UPDATE : %d",reg_UFPT_NB_NEED_UPDATE [i]); |
---|
656 | for (uint32_t j=0; j<_param->_size_ufpt_queue[i]; j++) |
---|
657 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," [%d] %.4d, %.8x %.8x, %.1d %.1d, %.8d %.8x %.4d - %s", |
---|
658 | j, |
---|
659 | reg_UPDATE_FETCH_PREDICTION_TABLE [i][j]._condition, |
---|
660 | reg_UPDATE_FETCH_PREDICTION_TABLE [i][j]._address_src, |
---|
661 | reg_UPDATE_FETCH_PREDICTION_TABLE [i][j]._address_dest, |
---|
662 | reg_UPDATE_FETCH_PREDICTION_TABLE [i][j]._last_take, |
---|
663 | reg_UPDATE_FETCH_PREDICTION_TABLE [i][j]._is_accurate, |
---|
664 | reg_UPDATE_FETCH_PREDICTION_TABLE [i][j]._history, |
---|
665 | reg_UPDATE_FETCH_PREDICTION_TABLE [i][j]._address_ras, |
---|
666 | reg_UPDATE_FETCH_PREDICTION_TABLE [i][j]._index_ras, |
---|
667 | toString(reg_UPDATE_FETCH_PREDICTION_TABLE [i][j]._state).c_str() |
---|
668 | ); |
---|
669 | |
---|
670 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * Update_Prediction_Table [%d]",i); |
---|
671 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * reg_UPT_BOTTOM : %d",reg_UPT_BOTTOM [i]); |
---|
672 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * reg_UPT_TOP : %d",reg_UPT_TOP [i]); |
---|
673 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * reg_UPT_TOP_EVENT : %d",reg_UPT_TOP_EVENT [i]); |
---|
674 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * reg_UPT_UPDATE : %d",reg_UPT_UPDATE [i]); |
---|
675 | for (uint32_t j=0; j<_param->_size_upt_queue[i]; j++) |
---|
676 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," [%d] %.4d, %.8x %.8x, %.1d %.1d %.1d, %.8d %.8x %.4d - %s", |
---|
677 | j, |
---|
678 | reg_UPDATE_PREDICTION_TABLE [i][j]._condition, |
---|
679 | reg_UPDATE_PREDICTION_TABLE [i][j]._address_src, |
---|
680 | reg_UPDATE_PREDICTION_TABLE [i][j]._address_dest, |
---|
681 | reg_UPDATE_PREDICTION_TABLE [i][j]._last_take, |
---|
682 | reg_UPDATE_PREDICTION_TABLE [i][j]._good_take, |
---|
683 | reg_UPDATE_PREDICTION_TABLE [i][j]._is_accurate, |
---|
684 | reg_UPDATE_PREDICTION_TABLE [i][j]._history, |
---|
685 | reg_UPDATE_PREDICTION_TABLE [i][j]._address_ras, |
---|
686 | reg_UPDATE_PREDICTION_TABLE [i][j]._index_ras, |
---|
687 | toString(reg_UPDATE_PREDICTION_TABLE [i][j]._state).c_str() |
---|
688 | ); |
---|
689 | } |
---|
690 | #endif |
---|
691 | } |
---|
692 | |
---|
693 | |
---|
694 | #if defined(STATISTICS) or defined(VHDL_TESTBENCH) |
---|
695 | end_cycle (); |
---|
696 | #endif |
---|
697 | |
---|
698 | log_end(Update_Prediction_Table,FUNCTION); |
---|
699 | }; |
---|
700 | |
---|
701 | }; // end namespace update_prediction_table |
---|
702 | }; // end namespace prediction_unit |
---|
703 | }; // end namespace front_end |
---|
704 | }; // end namespace multi_front_end |
---|
705 | }; // end namespace core |
---|
706 | |
---|
707 | }; // end namespace behavioural |
---|
708 | }; // end namespace morpheo |
---|
709 | #endif |
---|