[82] | 1 | #ifdef SYSTEMC |
---|
| 2 | /* |
---|
| 3 | * $Id$ |
---|
| 4 | * |
---|
| 5 | * [ Description ] |
---|
| 6 | * |
---|
| 7 | */ |
---|
| 8 | |
---|
| 9 | #include "Behavioural/Core/Multi_Front_end/Front_end/Prediction_unit/Prediction_unit_Glue/include/Prediction_unit_Glue.h" |
---|
| 10 | |
---|
| 11 | namespace morpheo { |
---|
| 12 | namespace behavioural { |
---|
| 13 | namespace core { |
---|
| 14 | namespace multi_front_end { |
---|
| 15 | namespace front_end { |
---|
| 16 | namespace prediction_unit { |
---|
| 17 | namespace prediction_unit_glue { |
---|
| 18 | |
---|
| 19 | |
---|
| 20 | #undef FUNCTION |
---|
| 21 | #define FUNCTION "Prediction_unit_Glue::genMealy_decod" |
---|
| 22 | void Prediction_unit_Glue::genMealy_decod (void) |
---|
| 23 | { |
---|
| 24 | log_printf(FUNC,Prediction_unit_Glue,FUNCTION,"Begin"); |
---|
| 25 | |
---|
| 26 | uint32_t decod_unit = reg_DECOD_PRIORITY; |
---|
| 27 | |
---|
| 28 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * decod_unit : %d",decod_unit); |
---|
| 29 | |
---|
| 30 | Tcontrol_t ack [_param->_nb_inst_decod[decod_unit]]; |
---|
| 31 | |
---|
| 32 | for (uint32_t i=0;i<_param->_nb_inst_decod[decod_unit]; i++) |
---|
| 33 | ack [i] = true; |
---|
| 34 | |
---|
| 35 | Tcontrol_t btb_val [_param->_nb_inst_branch_decod]; |
---|
| 36 | Tcontrol_t ras_val [_param->_nb_inst_branch_decod]; |
---|
| 37 | Tcontrol_t upt_val [_param->_nb_inst_branch_decod]; |
---|
| 38 | |
---|
| 39 | for (uint32_t i=0; i<_param->_nb_inst_branch_decod; i++) |
---|
| 40 | { |
---|
| 41 | btb_val [i] = false; |
---|
| 42 | ras_val [i] = false; |
---|
| 43 | upt_val [i] = false; |
---|
| 44 | } |
---|
| 45 | |
---|
| 46 | uint32_t port = 0; |
---|
| 47 | for (uint32_t i=0; i<_param->_nb_inst_decod[decod_unit]; i++) |
---|
| 48 | // Test if decod_unit have detected a branch |
---|
| 49 | if ((port>=_param->_nb_inst_branch_decod) or |
---|
| 50 | (PORT_READ(in_DECOD_VAL [decod_unit][i]) == 0)) |
---|
| 51 | { |
---|
| 52 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * DECOD[%d][%d] : not valid",decod_unit,i); |
---|
| 53 | ack [i] = false; |
---|
| 54 | } |
---|
| 55 | else |
---|
| 56 | { |
---|
| 57 | Tcontext_t context = (_param->_have_port_context_id)?PORT_READ(in_DECOD_CONTEXT_ID [decod_unit][i]):0; |
---|
| 58 | Tbranch_state_t branch_state = PORT_READ(in_DECOD_BRANCH_STATE [decod_unit][i]); |
---|
| 59 | Tcontrol_t match_inst_ifetch_ptr = PORT_READ(in_DECOD_MATCH_INST_IFETCH_PTR [decod_unit][i]); |
---|
| 60 | Tprediction_ptr_t depth = (_param->_have_port_max_depth)?PORT_READ(in_DECOD_BRANCH_UPDATE_PREDICTION_ID [decod_unit][i]):0; |
---|
| 61 | Tcontrol_t use_btb = false; |
---|
| 62 | Tcontrol_t use_ras = false; |
---|
| 63 | Tcontrol_t use_upt = true ; |
---|
| 64 | Tcontrol_t miss_ifetch = ( (branch_state == BRANCH_STATE_NONE) or // branch not detected |
---|
| 65 | ((branch_state != BRANCH_STATE_NONE) and (match_inst_ifetch_ptr == 0))); // branch detected, but it's not the good |
---|
| 66 | Tcontrol_t miss_decod; |
---|
| 67 | |
---|
| 68 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * DECOD[%d][%d] : valid",decod_unit,i); |
---|
| 69 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * depth [%d] : %d",i ,depth); |
---|
| 70 | |
---|
| 71 | // Test if ifetch have detecte a branch is the packet |
---|
| 72 | if (miss_ifetch) |
---|
| 73 | { |
---|
| 74 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * miss_ifetch"); |
---|
| 75 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * state : %d",branch_state); |
---|
| 76 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * match : %d",match_inst_ifetch_ptr); |
---|
| 77 | Tbranch_condition_t condition = PORT_READ(in_DECOD_BRANCH_CONDITION [decod_unit][i]); |
---|
| 78 | Tcontrol_t direction = PORT_READ(in_DECOD_BRANCH_DIRECTION [decod_unit][i]); |
---|
| 79 | Taddress_t address_src = PORT_READ(in_DECOD_ADDRESS_SRC [decod_unit][i]); |
---|
| 80 | Taddress_t address_dest = PORT_READ(in_DECOD_ADDRESS_DEST [decod_unit][i]); |
---|
| 81 | Tcontrol_t is_accurate; |
---|
| 82 | |
---|
| 83 | // Miss speculation |
---|
| 84 | use_btb = true; |
---|
| 85 | |
---|
| 86 | switch (condition) |
---|
| 87 | { |
---|
| 88 | case BRANCH_CONDITION_NONE_WITH_WRITE_STACK : |
---|
| 89 | { |
---|
| 90 | // Write stack |
---|
| 91 | is_accurate = PORT_READ(in_DECOD_RAS_HIT [port]); |
---|
| 92 | miss_decod = false; |
---|
| 93 | use_ras = true; |
---|
| 94 | |
---|
| 95 | PORT_WRITE(out_DECOD_RAS_PUSH [port],1); |
---|
| 96 | PORT_WRITE(out_DECOD_RAS_ADDRESS_PUSH [port],address_dest); |
---|
| 97 | |
---|
| 98 | break; |
---|
| 99 | } |
---|
| 100 | |
---|
| 101 | case BRANCH_CONDITION_READ_REGISTER_WITH_WRITE_STACK : |
---|
| 102 | { |
---|
| 103 | // Write stack |
---|
| 104 | is_accurate = false; |
---|
| 105 | miss_decod = false; |
---|
| 106 | use_ras = true; |
---|
| 107 | |
---|
| 108 | PORT_WRITE(out_DECOD_RAS_PUSH [port],1); |
---|
| 109 | PORT_WRITE(out_DECOD_RAS_ADDRESS_PUSH [port],address_dest); |
---|
| 110 | |
---|
| 111 | break; |
---|
| 112 | } |
---|
| 113 | case BRANCH_CONDITION_READ_STACK : |
---|
| 114 | { |
---|
| 115 | // Read stack |
---|
| 116 | is_accurate = PORT_READ(in_DECOD_RAS_HIT [port]); |
---|
| 117 | miss_decod = false; |
---|
| 118 | use_ras = true; |
---|
| 119 | |
---|
| 120 | PORT_WRITE(out_DECOD_RAS_PUSH [port],0); |
---|
| 121 | address_dest = PORT_READ(in_DECOD_RAS_ADDRESS_POP [port]); |
---|
| 122 | |
---|
| 123 | break; |
---|
| 124 | } |
---|
| 125 | case BRANCH_CONDITION_READ_REGISTER_WITHOUT_WRITE_STACK : |
---|
| 126 | { |
---|
| 127 | // * READ_REGISTER_WITHOUT_WRITE_STACK : Take but destination is unknow - don't continue |
---|
| 128 | is_accurate = PORT_READ(in_DECOD_RAS_HIT [port]); |
---|
| 129 | miss_decod = true; |
---|
| 130 | |
---|
| 131 | break; |
---|
| 132 | } |
---|
| 133 | |
---|
| 134 | case BRANCH_CONDITION_FLAG_UNSET : |
---|
| 135 | case BRANCH_CONDITION_FLAG_SET : |
---|
| 136 | { |
---|
| 137 | // No access at the flag |
---|
| 138 | // * FLAG : static direction and destination is know |
---|
| 139 | is_accurate = PORT_READ(in_DECOD_RAS_HIT [port]); |
---|
| 140 | miss_decod = false; |
---|
| 141 | |
---|
| 142 | break; |
---|
| 143 | } |
---|
| 144 | |
---|
| 145 | case BRANCH_CONDITION_NONE_WITHOUT_WRITE_STACK : |
---|
| 146 | { |
---|
| 147 | // No access at the flag |
---|
| 148 | // * NONE_WITHOUT_WRITE_STACK : take and destination is know |
---|
| 149 | is_accurate = false; |
---|
| 150 | miss_decod = false; |
---|
| 151 | use_ras = true; |
---|
| 152 | |
---|
| 153 | PORT_WRITE(out_DECOD_RAS_PUSH [port],1); |
---|
| 154 | PORT_WRITE(out_DECOD_RAS_ADDRESS_PUSH [port],address_dest); |
---|
| 155 | |
---|
| 156 | break; |
---|
| 157 | } |
---|
| 158 | |
---|
| 159 | } |
---|
| 160 | |
---|
| 161 | if (use_btb) |
---|
| 162 | { |
---|
| 163 | if (_param->_have_port_context_id) |
---|
| 164 | PORT_WRITE(out_DECOD_BTB_CONTEXT_ID [port],context); |
---|
| 165 | PORT_WRITE(out_DECOD_BTB_ADDRESS_SRC [port],address_src); |
---|
| 166 | PORT_WRITE(out_DECOD_BTB_ADDRESS_DEST [port],address_dest); |
---|
| 167 | PORT_WRITE(out_DECOD_BTB_CONDITION [port],condition); |
---|
| 168 | PORT_WRITE(out_DECOD_BTB_LAST_TAKE [port],direction); |
---|
| 169 | PORT_WRITE(out_DECOD_BTB_MISS_PREDICTION [port],1); |
---|
| 170 | PORT_WRITE(out_DECOD_BTB_IS_ACCURATE [port],is_accurate); |
---|
| 171 | } |
---|
| 172 | if (use_ras) |
---|
| 173 | { |
---|
| 174 | miss_decod |= not PORT_READ(in_DECOD_RAS_HIT [port]); |
---|
| 175 | |
---|
| 176 | if (_param->_have_port_context_id) |
---|
| 177 | PORT_WRITE(out_DECOD_RAS_CONTEXT_ID [port],context); |
---|
| 178 | PORT_WRITE(out_DECOD_RAS_MISS_PREDICTION [port],1); |
---|
| 179 | } |
---|
| 180 | if (use_upt) |
---|
| 181 | { |
---|
| 182 | PORT_WRITE(out_DECOD_UPT_BTB_ADDRESS_SRC [port],address_src); |
---|
| 183 | PORT_WRITE(out_DECOD_UPT_BTB_ADDRESS_DEST [port],address_dest); |
---|
| 184 | PORT_WRITE(out_DECOD_UPT_BTB_CONDITION [port],condition); |
---|
| 185 | PORT_WRITE(out_DECOD_UPT_BTB_LAST_TAKE [port],direction); |
---|
| 186 | PORT_WRITE(out_DECOD_UPT_RAS_ADDRESS [port],PORT_READ(in_DECOD_RAS_ADDRESS_POP [port])); |
---|
| 187 | } |
---|
| 188 | } |
---|
| 189 | else |
---|
| 190 | { |
---|
| 191 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * hit"); |
---|
| 192 | |
---|
| 193 | miss_decod = false; |
---|
| 194 | // Hit speculation |
---|
| 195 | } |
---|
| 196 | |
---|
| 197 | // in all case |
---|
| 198 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * use_btb : %d",use_btb); |
---|
| 199 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * use_ras : %d",use_ras); |
---|
| 200 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * use_upt : %d",use_upt); |
---|
| 201 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * btb_ack [%d] : %d",port,PORT_READ(in_DECOD_BTB_ACK [port])); |
---|
| 202 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * ras_ack [%d] : %d",port,PORT_READ(in_DECOD_RAS_ACK [port])); |
---|
| 203 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * upt_ack [%d] : %d",port,PORT_READ(in_DECOD_UPT_ACK [port])); |
---|
| 204 | |
---|
| 205 | btb_val [port] = (use_btb and |
---|
| 206 | (not use_ras or (use_ras and PORT_READ(in_DECOD_RAS_ACK [port]))) and |
---|
| 207 | (not use_upt or (use_upt and PORT_READ(in_DECOD_UPT_ACK [port])))); |
---|
| 208 | |
---|
| 209 | ras_val [port] = (use_ras and |
---|
| 210 | (not use_btb or (use_btb and PORT_READ(in_DECOD_BTB_ACK [port]))) and |
---|
| 211 | (not use_upt or (use_upt and PORT_READ(in_DECOD_UPT_ACK [port])))); |
---|
| 212 | |
---|
| 213 | upt_val [port] = (use_upt and |
---|
| 214 | (not use_btb or (use_btb and PORT_READ(in_DECOD_BTB_ACK [port]))) and |
---|
| 215 | (not use_ras or (use_ras and PORT_READ(in_DECOD_RAS_ACK [port])))); |
---|
| 216 | |
---|
| 217 | if (use_btb) |
---|
| 218 | ack [i] &= btb_val [port] and PORT_READ(in_DECOD_BTB_ACK [port]); |
---|
| 219 | if (use_ras) |
---|
| 220 | ack [i] &= ras_val [port] and PORT_READ(in_DECOD_RAS_ACK [port]); |
---|
| 221 | if (use_upt) |
---|
| 222 | ack [i] &= upt_val [port] and PORT_READ(in_DECOD_UPT_ACK [port]); |
---|
| 223 | |
---|
| 224 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * btb_val [%d] : %d",port,btb_val [port]); |
---|
| 225 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * ras_val [%d] : %d",port,ras_val [port]); |
---|
| 226 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * upt_val [%d] : %d",port,upt_val [port]); |
---|
| 227 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * ack [%d] : %d",i ,ack [i ]); |
---|
| 228 | |
---|
| 229 | if (_param->_have_port_context_id) |
---|
| 230 | PORT_WRITE(out_DECOD_UPT_CONTEXT_ID [port],context); |
---|
| 231 | PORT_WRITE(out_DECOD_UPT_MISS_IFETCH [port],miss_ifetch); |
---|
| 232 | PORT_WRITE(out_DECOD_UPT_MISS_DECOD [port],miss_decod ); |
---|
| 233 | if (_param->_have_port_max_depth) |
---|
| 234 | PORT_WRITE(out_DECOD_UPT_UPDATE_PREDICTION_ID [port],depth); |
---|
| 235 | |
---|
| 236 | port ++; |
---|
| 237 | } |
---|
| 238 | |
---|
| 239 | for (uint32_t i=0; i<_param->_nb_inst_branch_decod; i++) |
---|
| 240 | { |
---|
| 241 | PORT_WRITE(out_DECOD_BTB_VAL [i], btb_val [i]); |
---|
| 242 | PORT_WRITE(out_DECOD_RAS_VAL [i], ras_val [i]); |
---|
| 243 | PORT_WRITE(out_DECOD_UPT_VAL [i], upt_val [i]); |
---|
| 244 | } |
---|
| 245 | |
---|
| 246 | for (uint32_t i=0; i<_param->_nb_decod_unit; i++) |
---|
| 247 | for (uint32_t j=0; j<_param->_nb_inst_decod[i]; j++) |
---|
| 248 | if (i!= decod_unit) |
---|
| 249 | PORT_WRITE(out_DECOD_ACK [i][j], 0); |
---|
| 250 | else |
---|
| 251 | PORT_WRITE(out_DECOD_ACK [i][j], ack[j]); |
---|
| 252 | |
---|
| 253 | log_printf(FUNC,Prediction_unit_Glue,FUNCTION,"End"); |
---|
| 254 | }; |
---|
| 255 | |
---|
| 256 | }; // end namespace prediction_unit_glue |
---|
| 257 | }; // end namespace prediction_unit |
---|
| 258 | }; // end namespace front_end |
---|
| 259 | }; // end namespace multi_front_end |
---|
| 260 | }; // end namespace core |
---|
| 261 | |
---|
| 262 | }; // end namespace behavioural |
---|
| 263 | }; // end namespace morpheo |
---|
| 264 | #endif |
---|