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/Prediction_unit_Glue/include/Prediction_unit_Glue.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 prediction_unit_glue { |
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18 | |
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19 | |
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20 | #undef FUNCTION |
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21 | #define FUNCTION "Prediction_unit_Glue::genMealy_predict" |
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22 | void Prediction_unit_Glue::genMealy_predict (void) |
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23 | { |
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24 | log_begin(Prediction_unit_Glue,FUNCTION); |
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25 | log_function(Prediction_unit_Glue,FUNCTION,_name.c_str()); |
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26 | |
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27 | if (PORT_READ(in_NRESET)) |
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28 | { |
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29 | // Init |
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30 | Tcontrol_t ack [_param->_nb_context]; |
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31 | for (uint32_t i=0; i<_param->_nb_context; i++) |
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32 | ack [i] = 0; |
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33 | |
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34 | for (uint32_t i=0; i<_param->_nb_inst_branch_predict; i++) |
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35 | { |
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36 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * PREDICT [%d]",i); |
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37 | |
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38 | // No access |
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39 | Tcontrol_t btb_val = false; |
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40 | Tcontrol_t dir_val = false; |
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41 | Tcontrol_t ras_val = false; |
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42 | Tcontrol_t upt_val = false; |
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43 | |
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44 | // Get ack |
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45 | Tcontrol_t btb_ack = PORT_READ(in_PREDICT_BTB_ACK [i]); |
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46 | Tcontrol_t dir_ack = PORT_READ(in_PREDICT_DIR_ACK [i]); |
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47 | Tcontrol_t ras_ack = PORT_READ(in_PREDICT_RAS_ACK [i]); |
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48 | Tcontrol_t upt_ack = PORT_READ(in_PREDICT_UPT_ACK [i]); |
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49 | |
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50 | // Read context_id |
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51 | Tcontext_t context = (reg_PREDICT_PRIORITY+i)%_param->_nb_context; // priority |
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52 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * context : %d",context); |
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53 | |
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54 | // Now : ack transaction |
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55 | ack [context] = 1; |
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56 | |
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57 | if (PORT_READ(in_PREDICT_VAL[context]) == 0) |
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58 | { |
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59 | // Nothing |
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60 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * not valid ..."); |
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61 | |
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62 | // btb_val = false; |
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63 | // dir_val = false; |
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64 | // ras_val = false; |
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65 | // upt_val = false; |
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66 | } |
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67 | else |
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68 | { |
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69 | // Have transaction |
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70 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * valid ..."); |
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71 | |
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72 | // Read information (PC) |
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73 | Taddress_t pc_previous = PORT_READ(in_PREDICT_PC_PREVIOUS [context]); |
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74 | Taddress_t pc_current = PORT_READ(in_PREDICT_PC_CURRENT [context]); |
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75 | Tcontrol_t pc_current_is_ds_take = PORT_READ(in_PREDICT_PC_CURRENT_IS_DS_TAKE [context]); |
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76 | |
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77 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * pc_previous : 0x%.8x (0x%.8x)",pc_previous,pc_previous<<2); |
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78 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * pc_current : 0x%.8x (0x%.8x)",pc_current ,pc_current <<2); |
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79 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * pc_current_is_ds_take : %d" ,pc_current_is_ds_take); |
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80 | |
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81 | Taddress_t pc_next ; |
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82 | Tcontrol_t pc_next_is_ds_take ; |
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83 | Tbranch_state_t branch_state ; |
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84 | // Tprediction_ptr_t branch_update_prediction_id ; |
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85 | Tinst_ifetch_ptr_t inst_ifetch_ptr ; |
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86 | |
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87 | // STEP (1) - Compute the address source |
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88 | // -> if pc_current is a ds take, then pc_previous is a branchement |
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89 | // get branchement address to send at the BTB |
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90 | Taddress_t address = (pc_current_is_ds_take)?pc_previous:pc_current; |
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91 | // Address_lsb = position in fetch packet |
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92 | Taddress_t address_lsb = pc_current%_param->_nb_instruction [context]; //if pc_current_is_ds_take, then pc_current%_param->_nb_instruction [context] == 0 |
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93 | Taddress_t address_msb; |
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94 | |
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95 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * address : 0x%.8x (0x%.8x)",address,address<<2); |
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96 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * address_lsb : %d" ,address_lsb); |
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97 | |
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98 | // STEP (2) - Test if branch (access at branch_target_buffer) |
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99 | // Access at the btb |
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100 | btb_val = true; |
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101 | |
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102 | // Create the request |
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103 | if (_param->_have_port_context_id) |
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104 | PORT_WRITE(out_PREDICT_BTB_CONTEXT_ID [i],context); |
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105 | PORT_WRITE(out_PREDICT_BTB_ADDRESS [i],address); |
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106 | |
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107 | // Transaction can be ack if btb is not busy |
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108 | ack [context] &= btb_ack; |
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109 | |
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110 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * btb_ack : %d" ,btb_ack); |
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111 | |
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112 | // BTB_ack = 0 ? else can continue |
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113 | if (not btb_ack) |
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114 | continue; |
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115 | |
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116 | // Test a special case : |
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117 | // if pc_current is a delay slot, then pc_previous is a branchement instruction, also hit must be set. |
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118 | // else : an another branch instruction have eject this branch : can't accurate |
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119 | Tcontrol_t hit = PORT_READ(in_PREDICT_BTB_HIT[i]); |
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120 | Tcontrol_t is_accurate = not (pc_current_is_ds_take and not hit); |
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121 | Tcontrol_t btb_is_accurate = PORT_READ(in_PREDICT_BTB_IS_ACCURATE [i]); |
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122 | |
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123 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * hit : %d" ,hit); |
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124 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * is_accurate : %d" ,is_accurate); |
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125 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * btb_is_accurate : %d" ,btb_is_accurate); |
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126 | |
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127 | // STEP (3) : Test if BTB find a branch instruction in the packet |
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128 | if (hit == 1) |
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129 | { |
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130 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * BTB hit : no sequential order"); |
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131 | |
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132 | // STEP (3a) : branch - test condition |
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133 | bool use_dir = false; |
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134 | bool use_ras = false; |
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135 | bool use_upt = false; |
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136 | |
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137 | Taddress_t address_src = PORT_READ(in_PREDICT_BTB_ADDRESS_SRC [i]); |
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138 | Taddress_t address_src_lsb = address_src%_param->_nb_instruction [context]; |
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139 | |
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140 | inst_ifetch_ptr = address_src_lsb; |
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141 | |
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142 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * address_src : 0x%.8x (0x%.8x)",address_src,address_src<<2); |
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143 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * address_src_lsb : %d",address_src_lsb); |
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144 | |
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145 | // Special case : |
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146 | // * BTB hit and the branchement is the PC current and it's the last slot. |
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147 | // -> next pc must be the delay slot |
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148 | if ((not pc_current_is_ds_take) and // if pc_current is ds_take, then pc_next is the destination of branchement |
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149 | (address_src_lsb == (_param->_nb_instruction [context]-1))) |
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150 | { |
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151 | // branch is in the last slot of the packet |
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152 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * branch is in the last slot of the packet"); |
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153 | |
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154 | // Branch is the last slot : next paquet is the delay slot |
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155 | pc_next = address_src+1; // sequential |
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156 | pc_next_is_ds_take = 1; |
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157 | address_msb = _param->_nb_instruction [context]; // == (address_src_lsb+1) |
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158 | branch_state = BRANCH_STATE_NONE; |
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159 | } |
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160 | else |
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161 | { |
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162 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * branch is not in the last slot of the packet"); |
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163 | |
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164 | Tbranch_condition_t condition = PORT_READ(in_PREDICT_BTB_CONDITION [i]); |
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165 | Taddress_t address_dest = PORT_READ(in_PREDICT_BTB_ADDRESS_DEST [i]); |
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166 | Tcontrol_t push ; |
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167 | Tcontrol_t direction; |
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168 | |
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169 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * condition : %s" ,toString(condition).c_str()); |
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170 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * address_src : 0x%.8x (0x%.8x)",address_src ,address_src <<2); |
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171 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * address_dest : 0x%.8x (0x%.8x)",address_dest,address_dest<<2); |
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172 | |
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173 | switch (condition) |
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174 | { |
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175 | case BRANCH_CONDITION_NONE_WITHOUT_WRITE_STACK : // l.j |
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176 | { |
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177 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * BRANCH_CONDITION_NONE_WITHOUT_WRITE_STACK"); |
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178 | |
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179 | // use none unit (dir and ras) |
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180 | use_upt = true; |
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181 | direction = true; |
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182 | pc_next = address_dest; |
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183 | branch_state = BRANCH_STATE_NSPEC_TAKE; |
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184 | // is_accurate &= btb_is_accurate; |
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185 | |
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186 | break; |
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187 | } |
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188 | case BRANCH_CONDITION_NONE_WITH_WRITE_STACK : // l.jal |
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189 | { |
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190 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * BRANCH_CONDITION_NONE_WITH_WRITE_STACK"); |
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191 | |
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192 | use_upt = true; |
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193 | use_ras = true; |
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194 | push = true; |
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195 | direction = true; |
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196 | pc_next = address_dest; |
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197 | branch_state = BRANCH_STATE_NSPEC_TAKE; |
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198 | // is_accurate &= btb_is_accurate; |
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199 | |
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200 | break; |
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201 | } |
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202 | case BRANCH_CONDITION_FLAG_UNSET : // l.bnf |
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203 | case BRANCH_CONDITION_FLAG_SET : // l.bf |
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204 | { |
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205 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * BRANCH_CONDITION_FLAG"); |
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206 | |
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207 | use_upt = true; |
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208 | use_dir = true; |
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209 | // Test direction |
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210 | direction = PORT_READ(in_PREDICT_DIR_DIRECTION [i]); // Direction is not the "flag predict" ... also flag_unset and flag_set is the same |
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211 | if (direction == 1) |
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212 | { |
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213 | branch_state = BRANCH_STATE_SPEC_TAKE; |
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214 | pc_next = address_dest; |
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215 | } |
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216 | else |
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217 | { |
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218 | branch_state = BRANCH_STATE_SPEC_NTAKE; |
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219 | pc_next = address_src+2; // +1 = delay slot |
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220 | } |
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221 | |
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222 | // is_accurate &= btb_is_accurate; |
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223 | break; |
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224 | } |
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225 | case BRANCH_CONDITION_READ_REGISTER_WITHOUT_WRITE_STACK : // l.jr (rb!=9) |
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226 | { |
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227 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * BRANCH_CONDITION_READ_REGISTER_WITHOUT_WRITE_STACK"); |
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228 | |
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229 | use_upt = true; |
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230 | use_ras = true; |
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231 | push = true; |
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232 | direction = true; |
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233 | pc_next = address_dest; |
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234 | branch_state = BRANCH_STATE_SPEC_TAKE; |
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235 | is_accurate &= btb_is_accurate; |
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236 | |
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237 | break; |
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238 | } |
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239 | case BRANCH_CONDITION_READ_REGISTER_WITH_WRITE_STACK : // l.jalr |
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240 | { |
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241 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * BRANCH_CONDITION_READ_REGISTER_WITH_WRITE_STACK"); |
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242 | |
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243 | use_upt = true; |
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244 | use_ras = true; |
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245 | push = true; |
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246 | direction = true; |
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247 | pc_next = address_dest; |
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248 | branch_state = BRANCH_STATE_NSPEC_TAKE; |
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249 | is_accurate &= btb_is_accurate; |
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250 | |
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251 | break; |
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252 | } |
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253 | case BRANCH_CONDITION_READ_STACK : // l.jr (rb==9) |
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254 | { |
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255 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * BRANCH_CONDITION_READ_STACK"); |
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256 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * ras_hit : %d",PORT_READ(in_PREDICT_RAS_HIT [i])); |
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257 | use_upt = true; |
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258 | use_ras = true; |
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259 | push = false; |
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260 | direction = true; |
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261 | address_dest = PORT_READ(in_PREDICT_RAS_HIT [i])?PORT_READ(in_PREDICT_RAS_ADDRESS_POP [i]):address_dest; |
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262 | pc_next = address_dest; |
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263 | branch_state = BRANCH_STATE_SPEC_TAKE; |
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264 | is_accurate &= (PORT_READ(in_PREDICT_RAS_HIT [i]) or btb_is_accurate); // if miss - prediction is not accurate |
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265 | |
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266 | break; |
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267 | } |
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268 | default : |
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269 | { |
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270 | ERRORMORPHEO(FUNCTION,"Unknow Condition"); |
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271 | break; |
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272 | } |
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273 | } |
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274 | |
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275 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * direction : %d",direction); |
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276 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * branch_state : %d",branch_state); |
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277 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * pc_next : 0x%.8x (0x%.8x)",pc_next,pc_next<<2); |
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278 | |
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279 | if (use_dir) |
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280 | { |
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281 | ack[context] &= dir_ack; |
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282 | PORT_WRITE(out_PREDICT_DIR_ADDRESS_SRC [i], address_src); |
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283 | PORT_WRITE(out_PREDICT_DIR_STATIC [i], address_dest<address_src); // if destination is previous : the static direction is take |
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284 | // PORT_WRITE(out_PREDICT_DIR_LAST_TAKE [i], PORT_READ(in_PREDICT_BTB_LAST_TAKE [i])); |
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285 | } |
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286 | |
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287 | if (use_ras) |
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288 | { |
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289 | ack[context] &= ras_ack; |
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290 | if (_param->_have_port_context_id) |
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291 | PORT_WRITE(out_PREDICT_RAS_CONTEXT_ID [i], context); |
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292 | PORT_WRITE(out_PREDICT_RAS_PUSH [i], push); |
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293 | PORT_WRITE(out_PREDICT_RAS_ADDRESS_PUSH [i], address_src+2); |
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294 | } |
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295 | |
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296 | if (use_upt) |
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297 | { |
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298 | ack[context] &= upt_ack; |
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299 | |
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300 | if (_param->_have_port_context_id) |
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301 | PORT_WRITE(out_PREDICT_UPT_CONTEXT_ID [i],context); |
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302 | PORT_WRITE(out_PREDICT_UPT_BTB_ADDRESS_SRC [i],address_src); |
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303 | PORT_WRITE(out_PREDICT_UPT_BTB_ADDRESS_DEST [i],address_dest); |
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304 | PORT_WRITE(out_PREDICT_UPT_BTB_CONDITION [i],condition); |
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305 | PORT_WRITE(out_PREDICT_UPT_BTB_LAST_TAKE [i],direction); |
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306 | PORT_WRITE(out_PREDICT_UPT_BTB_IS_ACCURATE [i],is_accurate); |
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307 | // PORT_WRITE(out_PREDICT_UPT_DIR_HISTORY [i],PORT_READ(in_PREDICT_DIR_HISTORY [i])); |
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308 | PORT_WRITE(out_PREDICT_UPT_RAS_ADDRESS [i],PORT_READ(in_PREDICT_RAS_ADDRESS_POP [i])); |
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309 | // PORT_WRITE(out_PREDICT_UPT_RAS_INDEX [i],PORT_READ(in_PREDICT_RAS_INDEX [i])); |
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310 | } |
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311 | |
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312 | // ack = 1 if : |
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313 | // * btb_ack |
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314 | // * use_dir and dir_ack |
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315 | // * use_ras and ras_ack |
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316 | // * use_upt and upt_ack |
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317 | // ack [context] = (btb_ack and |
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318 | // (use_dir and dir_ack) and |
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319 | // (use_ras and ras_ack) and |
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320 | // (use_upt and upt_ack)); |
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321 | |
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322 | dir_val = (btb_ack and |
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323 | use_dir and |
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324 | // use_ras and |
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325 | // use_upt and |
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326 | // (not use_dir or (use_dir and dir_ack)) and |
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327 | (not use_ras or (use_ras and ras_ack)) and |
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328 | (not use_upt or (use_upt and upt_ack))); |
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329 | |
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330 | ras_val = (btb_ack and |
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331 | // use_dir and |
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332 | use_ras and |
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333 | // use_upt and |
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334 | (not use_dir or (use_dir and dir_ack)) and |
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335 | // (not use_ras or (use_ras and ras_ack)) and |
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336 | (not use_upt or (use_upt and upt_ack))); |
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337 | |
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338 | upt_val = (btb_ack and |
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339 | // use_dir and |
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340 | // use_ras and |
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341 | use_upt and |
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342 | (not use_dir or (use_dir and dir_ack)) and |
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343 | (not use_ras or (use_ras and ras_ack))// and |
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344 | // (not use_upt or (use_upt and upt_ack)) |
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345 | ); |
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346 | |
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347 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * btb_{ val, ack} : %d, %d", btb_val, btb_ack); |
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348 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * dir_{use, val, ack} : %d, %d, %d",use_dir,dir_val, dir_ack); |
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349 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * ras_{use, val, ack} : %d, %d, %d",use_ras,ras_val, ras_ack); |
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350 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * upt_{use, val, ack} : %d, %d, %d",use_upt,upt_val, upt_ack); |
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351 | |
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352 | |
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353 | // pc_next - is previously computed |
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354 | // branch_state - is previously computed |
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355 | |
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356 | |
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357 | // branch is in the last slot of the packet |
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358 | address_msb = (address_src_lsb+2); // +1 == delayed slot |
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359 | pc_next_is_ds_take = 0; |
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360 | } |
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361 | |
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362 | // branch_update_prediction_id = (_param->_have_port_depth)?((PORT_READ(in_DEPTH_UPT_TAIL[context])+PORT_READ(in_DEPTH_UPT_NB_BRANCH [context]))%_param->_array_size_depth[context]):0; |
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363 | } |
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364 | else |
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365 | { |
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366 | // STEP (3b) : Sequential order : compute next paquet |
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367 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * BTB miss : sequential order"); |
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368 | |
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369 | // Take the address packet base and add new packet |
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370 | pc_next = pc_current-address_lsb+_param->_nb_instruction [context]; // sequential |
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371 | pc_next_is_ds_take = 0; // no branch, also no delay slot |
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372 | inst_ifetch_ptr = 0; |
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373 | branch_state = BRANCH_STATE_NONE; |
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374 | // branch_update_prediction_id = 0; |
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375 | |
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376 | address_msb = _param->_nb_instruction [context]; |
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377 | } |
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378 | |
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379 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * address_msb : %d",address_msb); |
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380 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * pc_next : 0x%.8x (0x%.8x)",pc_next,pc_next<<2); |
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381 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * pc_next_is_ds_take : %d" ,pc_next_is_ds_take); |
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382 | |
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383 | // Write Output |
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384 | PORT_WRITE(out_PREDICT_PC_NEXT [context] , pc_next ); |
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385 | PORT_WRITE(out_PREDICT_PC_NEXT_IS_DS_TAKE [context] , pc_next_is_ds_take ); |
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386 | |
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387 | // Create enable mask |
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388 | Taddress_t address_limit_min = address_lsb; |
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389 | Taddress_t address_limit_max = ((pc_current_is_ds_take)?(address_lsb+1):address_msb); |
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390 | |
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391 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * instruction enable :"); |
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392 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * nb_inst : %d",_param->_nb_instruction [context]); |
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393 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * [0:%d[ = 0" ,address_limit_min); |
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394 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * [%d:%d[ = 1",address_limit_min,address_limit_max); |
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395 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * [%d:%d[ = 0",address_limit_max,_param->_nb_instruction [context]); |
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396 | |
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397 | for (uint32_t j=0; j<address_limit_min; j++) |
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398 | PORT_WRITE(out_PREDICT_INSTRUCTION_ENABLE [context][j], 0); // Before the address : not valid |
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399 | for (uint32_t j=address_limit_min; j<address_limit_max; j++) |
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400 | PORT_WRITE(out_PREDICT_INSTRUCTION_ENABLE [context][j], 1); // Valid packet |
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401 | for (uint32_t j=address_limit_max; j<_param->_nb_instruction [context]; j++) |
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402 | PORT_WRITE(out_PREDICT_INSTRUCTION_ENABLE [context][j], 0); // After last address (branch) : not valid |
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403 | |
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404 | if (_param->_have_port_inst_ifetch_ptr) |
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405 | PORT_WRITE(out_PREDICT_INST_IFETCH_PTR [context] , inst_ifetch_ptr ); |
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406 | PORT_WRITE(out_PREDICT_BRANCH_STATE [context] , branch_state ); |
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407 | if (_param->_have_port_depth) |
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408 | PORT_WRITE(out_PREDICT_BRANCH_UPDATE_PREDICTION_ID [context] , PORT_READ(in_PREDICT_UPT_BRANCH_UPDATE_PREDICTION_ID [i])); |
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409 | } |
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410 | |
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411 | // Write output |
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412 | PORT_WRITE(out_PREDICT_BTB_VAL [i], btb_val); |
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413 | PORT_WRITE(out_PREDICT_DIR_VAL [i], dir_val); |
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414 | PORT_WRITE(out_PREDICT_RAS_VAL [i], ras_val); |
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415 | PORT_WRITE(out_PREDICT_UPT_VAL [i], upt_val); |
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416 | } |
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417 | |
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418 | // Write output |
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419 | for (uint32_t i=0; i<_param->_nb_context; i++) |
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420 | PORT_WRITE(out_PREDICT_ACK[i],ack[i]); |
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421 | } |
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422 | else |
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423 | { |
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424 | // RESET |
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425 | for (uint32_t i=0; i<_param->_nb_inst_branch_predict; i++) |
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426 | { |
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427 | PORT_WRITE(out_PREDICT_BTB_VAL [i], 0); |
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428 | PORT_WRITE(out_PREDICT_DIR_VAL [i], 0); |
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429 | PORT_WRITE(out_PREDICT_RAS_VAL [i], 0); |
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430 | PORT_WRITE(out_PREDICT_UPT_VAL [i], 0); |
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431 | } |
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432 | for (uint32_t i=0; i<_param->_nb_context; i++) |
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433 | PORT_WRITE(out_PREDICT_ACK[i],0); |
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434 | } |
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435 | |
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436 | log_end(Prediction_unit_Glue,FUNCTION); |
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437 | }; |
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438 | |
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439 | }; // end namespace prediction_unit_glue |
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440 | }; // end namespace prediction_unit |
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441 | }; // end namespace front_end |
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442 | }; // end namespace multi_front_end |
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443 | }; // end namespace core |
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444 | |
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445 | }; // end namespace behavioural |
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446 | }; // end namespace morpheo |
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447 | #endif |
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