[81] | 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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[88] | 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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[81] | 26 | |
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[88] | 27 | if (PORT_READ(in_NRESET) == 1) |
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| 28 | { |
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| 29 | |
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[81] | 30 | // =================================================================== |
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| 31 | // =====[ DEPTH ]===================================================== |
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| 32 | // =================================================================== |
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| 33 | |
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[82] | 34 | for (uint32_t i=0; i<_param->_nb_context; i++) |
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| 35 | { |
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[101] | 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 | PORT_WRITE(out_DEPTH_VAL [i],(reg_UPDATE_PREDICTION_TABLE [i][reg_UPT_TOP [i]]._state == UPDATE_PREDICTION_STATE_EMPTY)); |
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[88] | 43 | if (_param->_have_port_depth) |
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| 44 | { |
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| 45 | PORT_WRITE(out_DEPTH_CURRENT [i], reg_UPT_TOP [i]); |
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| 46 | PORT_WRITE(out_DEPTH_MIN [i], reg_UPT_BOTTOM [i]); |
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[101] | 47 | PORT_WRITE(out_DEPTH_MAX [i], reg_UPT_TOP [i]); |
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[88] | 48 | } |
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[101] | 49 | PORT_WRITE(out_DEPTH_FULL [i], not reg_UPT_EMPTY [i] and (reg_UPT_TOP [i] == reg_UPT_BOTTOM [i])); |
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| 50 | |
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| 51 | // bool empty = reg_UPT_EMPTY [i]; |
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| 52 | // PORT_WRITE(out_DEPTH_MAX [i], ((empty)?reg_UPT_BOTTOM [i]:((reg_UPT_TOP [i]==0)?(_param->_size_upt_queue[i]-1):(reg_UPT_TOP [i]-1)))); |
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[82] | 53 | } |
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[88] | 54 | |
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[81] | 55 | // =================================================================== |
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| 56 | // =====[ UPDATE ]==================================================== |
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| 57 | // =================================================================== |
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| 58 | |
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[88] | 59 | bool retire_ras_from_ufpt [_param->_nb_context]; // event ufpt -> restore RAS, else update upt |
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| 60 | bool retire_ras_from_upt [_param->_nb_context]; // event upt -> restore RAS, else restore others structure |
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| 61 | bool ufpt_update [_param->_nb_context]; |
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| 62 | bool upt_update [_param->_nb_context]; |
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| 63 | Tdepth_t tab_ufpt_depth [_param->_nb_context]; |
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| 64 | Tdepth_t tab_upt_depth [_param->_nb_context]; |
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| 65 | |
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[81] | 66 | for (uint32_t i=0; i<_param->_nb_context; i++) |
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[88] | 67 | { |
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| 68 | event_state_t event_state = reg_EVENT_STATE [i]; |
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[81] | 69 | |
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[95] | 70 | retire_ras_from_ufpt [i] = ((event_state == EVENT_STATE_FLUSH_UFPT ) or |
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[88] | 71 | (event_state == EVENT_STATE_FLUSH_UFPT_AND_UPT)); |
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[95] | 72 | retire_ras_from_upt [i] = (event_state == EVENT_STATE_FLUSH_UPT); |
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[88] | 73 | |
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| 74 | ufpt_update [i] = true; |
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| 75 | upt_update [i] = true; |
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| 76 | tab_ufpt_depth [i] = reg_UFPT_UPDATE [i]; |
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| 77 | tab_upt_depth [i] = reg_UPT_UPDATE [i]; |
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| 78 | } |
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| 79 | |
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[81] | 80 | for (uint32_t i=0; i<_param->_nb_inst_update; i++) |
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| 81 | { |
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[88] | 82 | Tcontext_t context = (reg_UPDATE_PRIORITY+i)%_param->_nb_context; |
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[81] | 83 | |
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[88] | 84 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * UPDATE [%d] (genMoore)",i); |
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| 85 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * context : %d",context); |
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| 86 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * event_state : %s",toString(reg_EVENT_STATE [context]).c_str()); |
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[81] | 87 | |
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[88] | 88 | Tcontrol_t val = false; |
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| 89 | Tcontrol_t val_without_ack = false; |
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| 90 | Tcontrol_t miss_prediction ; |
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| 91 | Tcontrol_t direction_good ; |
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| 92 | Tcontrol_t btb_val ; |
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| 93 | Taddress_t btb_address_src ; |
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| 94 | Taddress_t btb_address_dest ; |
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| 95 | Tbranch_condition_t btb_condition ; |
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| 96 | Tcontrol_t dir_val ; |
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| 97 | Thistory_t dir_history ; |
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| 98 | Tcontrol_t ras_val ; |
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[94] | 99 | Tcontrol_t ras_flush ; |
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[88] | 100 | Tcontrol_t ras_push ; |
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| 101 | Taddress_t ras_address ; |
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| 102 | Tptr_t ras_index ; |
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| 103 | Tcontrol_t ras_prediction_ifetch; |
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[82] | 104 | |
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[88] | 105 | // Test if update fetch prediction table need update port |
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| 106 | if (retire_ras_from_ufpt [context]) |
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| 107 | { |
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| 108 | if (ufpt_update [context]) |
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| 109 | { |
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| 110 | // Update Fetch Prediction Table |
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| 111 | // An update of ufpt is to previous miss. Just restore Return Address Stack |
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| 112 | |
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| 113 | Tdepth_t depth = tab_ufpt_depth[context]; |
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| 114 | ufpt_state_t state = reg_UPDATE_FETCH_PREDICTION_TABLE [context][depth]._state; |
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| 115 | Tbranch_condition_t condition = reg_UPDATE_FETCH_PREDICTION_TABLE [context][depth]._condition; |
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| 116 | |
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| 117 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * Update Fetch Prediction Table"); |
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| 118 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * depth : %d",depth ); |
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| 119 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * state : %s",toString(state ).c_str()); |
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| 120 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * condition : %s",toString(condition).c_str()); |
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| 121 | |
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| 122 | val = (state == UPDATE_FETCH_PREDICTION_STATE_EVENT); |
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[94] | 123 | // val_without_ack = not update_ras(condition); |
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| 124 | |
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[88] | 125 | miss_prediction = 1; |
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| 126 | // direction_good = ; |
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| 127 | btb_val = 0; // don't update btb (is update by the event branch) |
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| 128 | // btb_address_src = ; |
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| 129 | // btb_address_dest = ; |
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| 130 | // btb_condition = ; |
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| 131 | dir_val = 0; // don't update btb (is update by the event branch (if conditionnal branch)) |
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| 132 | // dir_history = ; |
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| 133 | ras_val = update_ras(condition); // repop/ repush data -> don't corrupt ras |
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[94] | 134 | ras_flush = 0; |
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[88] | 135 | ras_push = push_ras(condition); |
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| 136 | ras_address = reg_UPDATE_FETCH_PREDICTION_TABLE [context][depth]._address_ras; |
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| 137 | ras_index = reg_UPDATE_FETCH_PREDICTION_TABLE [context][depth]._index_ras; |
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| 138 | ras_prediction_ifetch = 1; |
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| 139 | |
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| 140 | internal_UPDATE_FROM_UFPT [i] = true; |
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| 141 | internal_UPDATE_DEPTH [i] = depth; |
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| 142 | internal_UPDATE_RAS [i] = false; |
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[81] | 143 | |
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[88] | 144 | // Warning : don't update same entry |
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| 145 | if (depth == reg_UFPT_BOTTOM[context]) |
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| 146 | ufpt_update [context] = false; |
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| 147 | |
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[94] | 148 | tab_ufpt_depth[context] = ((depth==0)?_param->_size_ufpt_queue[context]:depth)-1; |
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[88] | 149 | } |
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| 150 | } |
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| 151 | else |
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| 152 | { |
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| 153 | if (upt_update [context]) |
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| 154 | { |
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| 155 | // Update Prediction Table |
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| 156 | |
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| 157 | Tdepth_t depth = tab_upt_depth[context]; |
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| 158 | upt_state_t state = reg_UPDATE_PREDICTION_TABLE [context][depth]._state; |
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| 159 | Tbranch_condition_t condition = reg_UPDATE_PREDICTION_TABLE [context][depth]._condition; |
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| 160 | Tcontrol_t ifetch = reg_UPDATE_PREDICTION_TABLE [context][depth]._ifetch_prediction; |
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| 161 | |
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| 162 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * Update Prediction Table"); |
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| 163 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * depth : %d",depth ); |
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| 164 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * state : %s",toString(state ).c_str()); |
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| 165 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * condition : %s",toString(condition).c_str()); |
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| 166 | |
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[95] | 167 | Tcontrol_t state_is_ok_ko = ((state == UPDATE_PREDICTION_STATE_OK ) or |
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| 168 | (state == UPDATE_PREDICTION_STATE_KO )); |
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| 169 | Tcontrol_t state_is_event = ((state == UPDATE_PREDICTION_STATE_KO ) or |
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| 170 | (state == UPDATE_PREDICTION_STATE_EVENT)); |
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[88] | 171 | Tcontrol_t state_is_event_update = state_is_event and need_update(condition); |
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| 172 | Tcontrol_t state_is_event_no_update = state_is_event and not need_update(condition); |
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[81] | 173 | |
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[88] | 174 | if (retire_ras_from_upt [context]) |
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| 175 | { |
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| 176 | val = state_is_event_update; |
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| 177 | val_without_ack = state_is_event_no_update; |
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| 178 | } |
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| 179 | else |
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| 180 | { |
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[95] | 181 | val = (state == UPDATE_PREDICTION_STATE_OK); |
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[88] | 182 | val_without_ack = false; |
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| 183 | } |
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[81] | 184 | |
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[88] | 185 | miss_prediction = (state != UPDATE_PREDICTION_STATE_OK); |
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| 186 | direction_good = reg_UPDATE_PREDICTION_TABLE [context][depth]._good_take ; |
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[95] | 187 | btb_val = state_is_ok_ko and update_btb(condition); |
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[88] | 188 | btb_address_src = reg_UPDATE_PREDICTION_TABLE [context][depth]._address_src ; |
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| 189 | btb_address_dest = reg_UPDATE_PREDICTION_TABLE [context][depth]._address_dest; |
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| 190 | btb_condition = condition; |
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[95] | 191 | dir_val = state_is_ok_ko and update_dir(condition) and ifetch; // if not ifetch, then static prediction |
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[88] | 192 | dir_history = reg_UPDATE_PREDICTION_TABLE [context][depth]._history ; |
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| 193 | ras_val = update_ras(condition); // repop/ repush data -> don't corrupt ras |
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[94] | 194 | ras_flush = (state == UPDATE_PREDICTION_STATE_KO); // miss prediction, RAS is corrupted |
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[88] | 195 | ras_push = push_ras(condition); |
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| 196 | ras_address = reg_UPDATE_PREDICTION_TABLE [context][depth]._address_ras; |
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| 197 | ras_index = reg_UPDATE_PREDICTION_TABLE [context][depth]._index_ras; |
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| 198 | ras_prediction_ifetch = ifetch; |
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| 199 | |
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| 200 | internal_UPDATE_FROM_UFPT [i] = false; |
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| 201 | internal_UPDATE_DEPTH [i] = depth; |
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| 202 | internal_UPDATE_RAS [i] = retire_ras_from_upt [context]; |
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| 203 | |
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| 204 | // Warning : don't update same entry |
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| 205 | if (retire_ras_from_upt [context]) |
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| 206 | { |
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| 207 | // Restore RAS. |
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| 208 | if ((depth == reg_UPT_BOTTOM[context]) or not (val or val_without_ack)) |
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| 209 | upt_update [context] = false; |
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| 210 | |
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| 211 | tab_upt_depth[context] = (depth==0)?(_param->_size_upt_queue[context]-1):(depth-1); |
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| 212 | } |
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| 213 | else |
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| 214 | { |
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| 215 | if ((depth == reg_UPT_TOP [context]) or not (val or val_without_ack)) |
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| 216 | upt_update [context] = false; |
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| 217 | |
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| 218 | tab_upt_depth[context] = (depth+1)%_param->_size_upt_queue[context]; |
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| 219 | } |
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| 220 | } |
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| 221 | } |
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[95] | 222 | |
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[88] | 223 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * val : %d",val ); |
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| 224 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * val_without_ack : %d",val_without_ack); |
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[95] | 225 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * miss_prediction : %d",miss_prediction); |
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| 226 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * direction_good : %d",direction_good ); |
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[88] | 227 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * btb_val : %d",btb_val); |
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| 228 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * dir_val : %d",dir_val); |
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| 229 | log_printf(TRACE,Update_Prediction_Table,FUNCTION," * ras_val : %d",ras_val); |
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| 230 | |
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| 231 | internal_UPDATE_VAL [i] = val; |
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| 232 | internal_UPDATE_VAL_WITHOUT_ACK [i] = val_without_ack; |
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| 233 | internal_UPDATE_CONTEXT_ID [i] = context; |
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| 234 | |
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| 235 | PORT_WRITE(out_UPDATE_VAL [i],internal_UPDATE_VAL [i]); |
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| 236 | if (val) |
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| 237 | { |
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| 238 | if (_param->_have_port_context_id) |
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| 239 | PORT_WRITE(out_UPDATE_CONTEXT_ID [i],context ); |
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| 240 | PORT_WRITE(out_UPDATE_MISS_PREDICTION [i],miss_prediction ); |
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| 241 | PORT_WRITE(out_UPDATE_DIRECTION_GOOD [i],direction_good ); |
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| 242 | PORT_WRITE(out_UPDATE_BTB_VAL [i],btb_val ); |
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| 243 | PORT_WRITE(out_UPDATE_BTB_ADDRESS_SRC [i],btb_address_src ); |
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| 244 | PORT_WRITE(out_UPDATE_BTB_ADDRESS_DEST [i],btb_address_dest ); |
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| 245 | PORT_WRITE(out_UPDATE_BTB_CONDITION [i],btb_condition ); |
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| 246 | PORT_WRITE(out_UPDATE_DIR_VAL [i],dir_val ); |
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| 247 | if (_param->_have_port_history) |
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| 248 | PORT_WRITE(out_UPDATE_DIR_HISTORY [i],dir_history ); |
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| 249 | PORT_WRITE(out_UPDATE_RAS_VAL [i],ras_val ); |
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[94] | 250 | PORT_WRITE(out_UPDATE_RAS_FLUSH [i],ras_flush ); |
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[88] | 251 | PORT_WRITE(out_UPDATE_RAS_PUSH [i],ras_push ); |
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| 252 | PORT_WRITE(out_UPDATE_RAS_ADDRESS [i],ras_address ); |
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| 253 | PORT_WRITE(out_UPDATE_RAS_INDEX [i],ras_index ); |
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| 254 | PORT_WRITE(out_UPDATE_RAS_PREDICTION_IFETCH [i],ras_prediction_ifetch); |
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| 255 | } |
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[81] | 256 | } |
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[94] | 257 | |
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| 258 | // =================================================================== |
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| 259 | // =====[ BRANCH_EVENT ]============================================== |
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| 260 | // =================================================================== |
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| 261 | for (uint32_t i=0; i<_param->_nb_context; i++) |
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| 262 | { |
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| 263 | Tcontrol_t val = (reg_EVENT_STATE [i] == EVENT_STATE_UPDATE_CONTEXT); |
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[81] | 264 | |
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[94] | 265 | PORT_WRITE(out_BRANCH_EVENT_VAL [i],val); |
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[98] | 266 | if (_param->_have_port_depth) |
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| 267 | PORT_WRITE(out_BRANCH_EVENT_DEPTH [i],reg_EVENT_DEPTH [i]); |
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[94] | 268 | PORT_WRITE(out_BRANCH_EVENT_ADDRESS_SRC [i],reg_EVENT_ADDRESS_SRC [i]); |
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| 269 | PORT_WRITE(out_BRANCH_EVENT_ADDRESS_DEST_VAL [i],reg_EVENT_ADDRESS_DEST_VAL [i]); |
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| 270 | PORT_WRITE(out_BRANCH_EVENT_ADDRESS_DEST [i],reg_EVENT_ADDRESS_DEST [i]); |
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[82] | 271 | |
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[94] | 272 | internal_BRANCH_EVENT_VAL [i] = val; |
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| 273 | } |
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| 274 | } |
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[82] | 275 | |
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[88] | 276 | log_end(Update_Prediction_Table,FUNCTION); |
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[81] | 277 | }; |
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| 278 | |
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| 279 | }; // end namespace update_prediction_table |
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| 280 | }; // end namespace prediction_unit |
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| 281 | }; // end namespace front_end |
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| 282 | }; // end namespace multi_front_end |
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| 283 | }; // end namespace core |
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| 284 | |
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| 285 | }; // end namespace behavioural |
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| 286 | }; // end namespace morpheo |
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| 287 | #endif |
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