[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 | { |
---|
[88] | 24 | log_begin(Prediction_unit_Glue,FUNCTION); |
---|
| 25 | log_function(Prediction_unit_Glue,FUNCTION,_name.c_str()); |
---|
[82] | 26 | |
---|
[98] | 27 | if (PORT_READ(in_NRESET)) |
---|
| 28 | { |
---|
[88] | 29 | // Init |
---|
[82] | 30 | uint32_t decod_unit = reg_DECOD_PRIORITY; |
---|
[88] | 31 | |
---|
[82] | 32 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * decod_unit : %d",decod_unit); |
---|
| 33 | |
---|
| 34 | Tcontrol_t ack [_param->_nb_inst_decod[decod_unit]]; |
---|
| 35 | |
---|
| 36 | for (uint32_t i=0;i<_param->_nb_inst_decod[decod_unit]; i++) |
---|
| 37 | ack [i] = true; |
---|
| 38 | |
---|
| 39 | Tcontrol_t btb_val [_param->_nb_inst_branch_decod]; |
---|
| 40 | Tcontrol_t ras_val [_param->_nb_inst_branch_decod]; |
---|
| 41 | Tcontrol_t upt_val [_param->_nb_inst_branch_decod]; |
---|
| 42 | |
---|
| 43 | for (uint32_t i=0; i<_param->_nb_inst_branch_decod; i++) |
---|
| 44 | { |
---|
| 45 | btb_val [i] = false; |
---|
| 46 | ras_val [i] = false; |
---|
| 47 | upt_val [i] = false; |
---|
| 48 | } |
---|
| 49 | |
---|
| 50 | uint32_t port = 0; |
---|
| 51 | for (uint32_t i=0; i<_param->_nb_inst_decod[decod_unit]; i++) |
---|
| 52 | // Test if decod_unit have detected a branch |
---|
| 53 | if ((port>=_param->_nb_inst_branch_decod) or |
---|
| 54 | (PORT_READ(in_DECOD_VAL [decod_unit][i]) == 0)) |
---|
[88] | 55 | { |
---|
[82] | 56 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * DECOD[%d][%d] : not valid",decod_unit,i); |
---|
| 57 | ack [i] = false; |
---|
| 58 | } |
---|
| 59 | else |
---|
| 60 | { |
---|
[88] | 61 | Tcontext_t context = (_param->_have_port_context_id)?PORT_READ(in_DECOD_CONTEXT_ID [decod_unit][i]):0; |
---|
| 62 | Tbranch_state_t branch_state = PORT_READ(in_DECOD_BRANCH_STATE [decod_unit][i]); |
---|
| 63 | Tcontrol_t match_inst_ifetch_ptr = PORT_READ(in_DECOD_MATCH_INST_IFETCH_PTR [decod_unit][i]); |
---|
| 64 | Tprediction_ptr_t depth = (_param->_have_port_depth)?PORT_READ(in_DECOD_BRANCH_UPDATE_PREDICTION_ID [decod_unit][i]):0; |
---|
| 65 | Tcontrol_t use_btb = false; |
---|
| 66 | Tcontrol_t use_ras = false; |
---|
| 67 | Tcontrol_t use_upt = true ; // always update upt. |
---|
[82] | 68 | |
---|
[88] | 69 | // Ifetch stage made an miss if : |
---|
| 70 | // * branch is previously predict, but it's not the good |
---|
| 71 | Tcontrol_t miss_ifetch = ((branch_state != BRANCH_STATE_NONE) and (match_inst_ifetch_ptr == 0)); |
---|
| 72 | // Decod stage made an miss if : |
---|
| 73 | // * branch was not detected |
---|
| 74 | Tcontrol_t miss_decod = (branch_state == BRANCH_STATE_NONE); |
---|
| 75 | |
---|
[82] | 76 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * DECOD[%d][%d] : valid",decod_unit,i); |
---|
[88] | 77 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * branch_state : %d",branch_state); |
---|
| 78 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * match_inst_ifetch_ptr : %d",match_inst_ifetch_ptr); |
---|
| 79 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * depth : [%d] %d",i,depth); |
---|
| 80 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * miss_ifetch : %d",miss_ifetch); |
---|
| 81 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * miss_decod : %d",miss_decod); |
---|
[82] | 82 | |
---|
| 83 | // Test if ifetch have detecte a branch is the packet |
---|
[88] | 84 | if (miss_ifetch or miss_decod) |
---|
[82] | 85 | { |
---|
[88] | 86 | Tbranch_condition_t condition = PORT_READ(in_DECOD_BRANCH_CONDITION [decod_unit][i]); |
---|
| 87 | Tcontrol_t direction = PORT_READ(in_DECOD_BRANCH_DIRECTION [decod_unit][i]); |
---|
| 88 | Taddress_t address_src = PORT_READ(in_DECOD_ADDRESS_SRC [decod_unit][i]); |
---|
| 89 | Taddress_t address_dest = PORT_READ(in_DECOD_ADDRESS_DEST [decod_unit][i]); |
---|
[82] | 90 | Tcontrol_t is_accurate; |
---|
| 91 | |
---|
| 92 | // Miss speculation |
---|
| 93 | use_btb = true; |
---|
| 94 | |
---|
| 95 | switch (condition) |
---|
| 96 | { |
---|
| 97 | case BRANCH_CONDITION_NONE_WITH_WRITE_STACK : |
---|
| 98 | { |
---|
[88] | 99 | // l.jal |
---|
| 100 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * BRANCH_CONDITION_NONE_WITH_WRITE_STACK"); |
---|
[82] | 101 | |
---|
[88] | 102 | is_accurate = true ;//PORT_READ(in_DECOD_RAS_HIT [port]); |
---|
| 103 | use_ras = true ; |
---|
| 104 | |
---|
[82] | 105 | PORT_WRITE(out_DECOD_RAS_PUSH [port],1); |
---|
[88] | 106 | PORT_WRITE(out_DECOD_RAS_ADDRESS_PUSH [port],address_src+2); |
---|
[82] | 107 | |
---|
| 108 | break; |
---|
| 109 | } |
---|
| 110 | |
---|
| 111 | case BRANCH_CONDITION_READ_REGISTER_WITH_WRITE_STACK : |
---|
| 112 | { |
---|
[88] | 113 | // l.jalr |
---|
| 114 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * BRANCH_CONDITION_READ_REGISTER_WITH_WRITE_STACK"); |
---|
| 115 | |
---|
| 116 | is_accurate = false; // address unknow : in a register |
---|
[82] | 117 | use_ras = true; |
---|
| 118 | |
---|
| 119 | PORT_WRITE(out_DECOD_RAS_PUSH [port],1); |
---|
[88] | 120 | PORT_WRITE(out_DECOD_RAS_ADDRESS_PUSH [port],address_src+2); |
---|
[82] | 121 | |
---|
| 122 | break; |
---|
| 123 | } |
---|
| 124 | case BRANCH_CONDITION_READ_STACK : |
---|
| 125 | { |
---|
[88] | 126 | // l.jr with rb=r9 |
---|
| 127 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * BRANCH_CONDITION_READ_STACK"); |
---|
| 128 | |
---|
[82] | 129 | is_accurate = PORT_READ(in_DECOD_RAS_HIT [port]); |
---|
| 130 | use_ras = true; |
---|
| 131 | |
---|
[88] | 132 | PORT_WRITE(out_DECOD_RAS_PUSH [port],0); // POP |
---|
[82] | 133 | address_dest = PORT_READ(in_DECOD_RAS_ADDRESS_POP [port]); |
---|
| 134 | |
---|
| 135 | break; |
---|
| 136 | } |
---|
| 137 | case BRANCH_CONDITION_READ_REGISTER_WITHOUT_WRITE_STACK : |
---|
| 138 | { |
---|
[88] | 139 | // l.jr with rb!=r9 |
---|
| 140 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * BRANCH_CONDITION_READ_REGISTER_WITHOUT_WRITE_STACK"); |
---|
| 141 | |
---|
[82] | 142 | // * READ_REGISTER_WITHOUT_WRITE_STACK : Take but destination is unknow - don't continue |
---|
[88] | 143 | is_accurate = false; // address unknow : in a register |
---|
[82] | 144 | |
---|
| 145 | break; |
---|
| 146 | } |
---|
| 147 | |
---|
| 148 | case BRANCH_CONDITION_FLAG_UNSET : |
---|
| 149 | case BRANCH_CONDITION_FLAG_SET : |
---|
| 150 | { |
---|
[88] | 151 | // l.bf, l.bnf |
---|
[82] | 152 | // * FLAG : static direction and destination is know |
---|
[88] | 153 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * BRANCH_CONDITION_FLAG"); |
---|
[82] | 154 | |
---|
[88] | 155 | is_accurate = true; // address dest is know |
---|
| 156 | |
---|
[82] | 157 | break; |
---|
| 158 | } |
---|
| 159 | |
---|
| 160 | case BRANCH_CONDITION_NONE_WITHOUT_WRITE_STACK : |
---|
| 161 | { |
---|
[88] | 162 | // l.j |
---|
| 163 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * BRANCH_CONDITION_NONE_WITHOUT_WRITE_STACK"); |
---|
[82] | 164 | |
---|
[88] | 165 | is_accurate = true; |
---|
[82] | 166 | |
---|
| 167 | break; |
---|
| 168 | } |
---|
| 169 | } |
---|
| 170 | |
---|
| 171 | if (use_btb) |
---|
| 172 | { |
---|
| 173 | if (_param->_have_port_context_id) |
---|
| 174 | PORT_WRITE(out_DECOD_BTB_CONTEXT_ID [port],context); |
---|
| 175 | PORT_WRITE(out_DECOD_BTB_ADDRESS_SRC [port],address_src); |
---|
| 176 | PORT_WRITE(out_DECOD_BTB_ADDRESS_DEST [port],address_dest); |
---|
| 177 | PORT_WRITE(out_DECOD_BTB_CONDITION [port],condition); |
---|
| 178 | PORT_WRITE(out_DECOD_BTB_LAST_TAKE [port],direction); |
---|
| 179 | PORT_WRITE(out_DECOD_BTB_MISS_PREDICTION [port],1); |
---|
| 180 | PORT_WRITE(out_DECOD_BTB_IS_ACCURATE [port],is_accurate); |
---|
| 181 | } |
---|
| 182 | if (use_ras) |
---|
| 183 | { |
---|
| 184 | miss_decod |= not PORT_READ(in_DECOD_RAS_HIT [port]); |
---|
| 185 | |
---|
| 186 | if (_param->_have_port_context_id) |
---|
| 187 | PORT_WRITE(out_DECOD_RAS_CONTEXT_ID [port],context); |
---|
| 188 | PORT_WRITE(out_DECOD_RAS_MISS_PREDICTION [port],1); |
---|
| 189 | } |
---|
| 190 | if (use_upt) |
---|
| 191 | { |
---|
[88] | 192 | PORT_WRITE(out_DECOD_UPT_BTB_ADDRESS_SRC [port],address_src); |
---|
| 193 | PORT_WRITE(out_DECOD_UPT_BTB_ADDRESS_DEST[port],address_dest); |
---|
| 194 | PORT_WRITE(out_DECOD_UPT_BTB_CONDITION [port],condition); |
---|
| 195 | PORT_WRITE(out_DECOD_UPT_BTB_LAST_TAKE [port],direction); |
---|
| 196 | PORT_WRITE(out_DECOD_UPT_RAS_ADDRESS [port],PORT_READ(in_DECOD_RAS_ADDRESS_POP [port])); |
---|
| 197 | PORT_WRITE(out_DECOD_UPT_IS_ACCURATE [port],is_accurate); |
---|
[82] | 198 | } |
---|
| 199 | } |
---|
[88] | 200 | // else |
---|
| 201 | // { |
---|
| 202 | // log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * hit"); |
---|
[82] | 203 | |
---|
[88] | 204 | // miss_decod = false; |
---|
| 205 | // // Hit speculation |
---|
| 206 | // } |
---|
[82] | 207 | |
---|
[88] | 208 | |
---|
[82] | 209 | // in all case |
---|
| 210 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * use_btb : %d",use_btb); |
---|
| 211 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * use_ras : %d",use_ras); |
---|
| 212 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * use_upt : %d",use_upt); |
---|
| 213 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * btb_ack [%d] : %d",port,PORT_READ(in_DECOD_BTB_ACK [port])); |
---|
| 214 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * ras_ack [%d] : %d",port,PORT_READ(in_DECOD_RAS_ACK [port])); |
---|
| 215 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * upt_ack [%d] : %d",port,PORT_READ(in_DECOD_UPT_ACK [port])); |
---|
| 216 | |
---|
| 217 | btb_val [port] = (use_btb and |
---|
| 218 | (not use_ras or (use_ras and PORT_READ(in_DECOD_RAS_ACK [port]))) and |
---|
| 219 | (not use_upt or (use_upt and PORT_READ(in_DECOD_UPT_ACK [port])))); |
---|
| 220 | |
---|
| 221 | ras_val [port] = (use_ras and |
---|
| 222 | (not use_btb or (use_btb and PORT_READ(in_DECOD_BTB_ACK [port]))) and |
---|
| 223 | (not use_upt or (use_upt and PORT_READ(in_DECOD_UPT_ACK [port])))); |
---|
| 224 | |
---|
| 225 | upt_val [port] = (use_upt and |
---|
| 226 | (not use_btb or (use_btb and PORT_READ(in_DECOD_BTB_ACK [port]))) and |
---|
| 227 | (not use_ras or (use_ras and PORT_READ(in_DECOD_RAS_ACK [port])))); |
---|
| 228 | |
---|
| 229 | if (use_btb) |
---|
| 230 | ack [i] &= btb_val [port] and PORT_READ(in_DECOD_BTB_ACK [port]); |
---|
| 231 | if (use_ras) |
---|
| 232 | ack [i] &= ras_val [port] and PORT_READ(in_DECOD_RAS_ACK [port]); |
---|
| 233 | if (use_upt) |
---|
| 234 | ack [i] &= upt_val [port] and PORT_READ(in_DECOD_UPT_ACK [port]); |
---|
| 235 | |
---|
| 236 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * btb_val [%d] : %d",port,btb_val [port]); |
---|
| 237 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * ras_val [%d] : %d",port,ras_val [port]); |
---|
| 238 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * upt_val [%d] : %d",port,upt_val [port]); |
---|
| 239 | log_printf(TRACE,Prediction_unit_Glue,FUNCTION," * ack [%d] : %d",i ,ack [i ]); |
---|
| 240 | |
---|
| 241 | if (_param->_have_port_context_id) |
---|
| 242 | PORT_WRITE(out_DECOD_UPT_CONTEXT_ID [port],context); |
---|
| 243 | PORT_WRITE(out_DECOD_UPT_MISS_IFETCH [port],miss_ifetch); |
---|
| 244 | PORT_WRITE(out_DECOD_UPT_MISS_DECOD [port],miss_decod ); |
---|
[88] | 245 | if (_param->_have_port_depth) |
---|
[82] | 246 | PORT_WRITE(out_DECOD_UPT_UPDATE_PREDICTION_ID [port],depth); |
---|
| 247 | |
---|
| 248 | port ++; |
---|
| 249 | } |
---|
| 250 | |
---|
[88] | 251 | // Write output |
---|
| 252 | |
---|
[82] | 253 | for (uint32_t i=0; i<_param->_nb_inst_branch_decod; i++) |
---|
| 254 | { |
---|
| 255 | PORT_WRITE(out_DECOD_BTB_VAL [i], btb_val [i]); |
---|
| 256 | PORT_WRITE(out_DECOD_RAS_VAL [i], ras_val [i]); |
---|
| 257 | PORT_WRITE(out_DECOD_UPT_VAL [i], upt_val [i]); |
---|
| 258 | } |
---|
| 259 | |
---|
| 260 | for (uint32_t i=0; i<_param->_nb_decod_unit; i++) |
---|
| 261 | for (uint32_t j=0; j<_param->_nb_inst_decod[i]; j++) |
---|
| 262 | if (i!= decod_unit) |
---|
| 263 | PORT_WRITE(out_DECOD_ACK [i][j], 0); |
---|
| 264 | else |
---|
| 265 | PORT_WRITE(out_DECOD_ACK [i][j], ack[j]); |
---|
[98] | 266 | } |
---|
[88] | 267 | log_end(Prediction_unit_Glue,FUNCTION); |
---|
[82] | 268 | }; |
---|
| 269 | |
---|
| 270 | }; // end namespace prediction_unit_glue |
---|
| 271 | }; // end namespace prediction_unit |
---|
| 272 | }; // end namespace front_end |
---|
| 273 | }; // end namespace multi_front_end |
---|
| 274 | }; // end namespace core |
---|
| 275 | |
---|
| 276 | }; // end namespace behavioural |
---|
| 277 | }; // end namespace morpheo |
---|
| 278 | #endif |
---|