1 | #ifdef SYSTEMC |
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2 | /* |
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3 | * $Id: Branch_Target_Buffer_Register_genMealy_predict.cpp 123 2009-06-08 20:43:30Z rosiere $ |
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4 | * |
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5 | * [ Description ] |
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6 | * |
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7 | */ |
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8 | |
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9 | #include "Behavioural/Core/Multi_Front_end/Front_end/Prediction_unit/Branch_Target_Buffer/Branch_Target_Buffer_Register/include/Branch_Target_Buffer_Register.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 branch_target_buffer { |
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18 | namespace branch_target_buffer_register { |
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19 | |
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20 | #undef FUNCTION |
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21 | #define FUNCTION "Branch_Target_Buffer_Register::genMealy_predict" |
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22 | void Branch_Target_Buffer_Register::genMealy_predict (void) |
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23 | { |
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24 | log_begin(Branch_Target_Buffer_Register,FUNCTION); |
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25 | log_function(Branch_Target_Buffer_Register,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 | for (uint32_t i=0; i<_param->_nb_inst_predict; i++) |
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30 | { |
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31 | log_printf(TRACE,Branch_Target_Buffer_Register,FUNCTION," * PREDICT [%d]",i); |
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32 | Tcontext_t context = (_param->_have_port_context_id)?PORT_READ(in_PREDICT_CONTEXT_ID [i]):0; |
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33 | Tgeneral_data_t address = PORT_READ(in_PREDICT_ADDRESS [i]); |
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34 | uint32_t num_bank = (address>>_param->_shift_bank)&_param->_mask_bank; |
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35 | |
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36 | Tgeneral_data_t address_tag = address >> _param->_shift_tag ; |
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37 | Tgeneral_data_t address_offset = (address >> _param->_shift_offset)&_param->_mask_offset; |
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38 | |
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39 | log_printf(TRACE,Branch_Target_Buffer_Register,FUNCTION," * address_ (tag, bank, offset) : %.8x %.8x %.8x",address_tag,num_bank, address_offset); |
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40 | |
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41 | for (uint32_t j=0; j<_param->_associativity; j++) |
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42 | { |
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43 | Tgeneral_data_t address_src_tag = reg_BTB[num_bank][j]._address_src >> _param->_shift_tag ; |
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44 | Tgeneral_data_t address_src_offset = (reg_BTB[num_bank][j]._address_src >> _param->_shift_offset)&_param->_mask_offset; |
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45 | |
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46 | Tcontrol_t hit = ((reg_BTB[num_bank][j]._val == 1 ) and |
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47 | (reg_BTB[num_bank][j]._context == context ) and |
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48 | (address_src_tag == address_tag ) and |
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49 | //address_bank is the same |
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50 | (address_src_offset >= address_offset)); |
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51 | |
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52 | log_printf(TRACE,Branch_Target_Buffer_Register,FUNCTION," * address_src (tag, bank, offset) : %.8x %.8x %.8x - hit : %d",address_src_tag,num_bank,address_src_offset, hit); |
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53 | |
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54 | // Hit : |
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55 | // * entry is valid |
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56 | // * context is the same |
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57 | // * address_src must be higher that the address, because the address lower is previous the current pc. |
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58 | // * prediction is no accurate is address_dest is not valid. |
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59 | PORT_WRITE(out_PREDICT_HIT [i][j],hit); |
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60 | PORT_WRITE(out_PREDICT_ADDRESS_SRC [i][j],reg_BTB[num_bank][j]._address_src ); |
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61 | PORT_WRITE(out_PREDICT_ADDRESS_DEST [i][j],reg_BTB[num_bank][j]._address_dest); |
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62 | PORT_WRITE(out_PREDICT_CONDITION [i][j],reg_BTB[num_bank][j]._condition ); |
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63 | PORT_WRITE(out_PREDICT_LAST_TAKE [i][j],reg_BTB[num_bank][j]._last_take ); |
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64 | PORT_WRITE(out_PREDICT_IS_ACCURATE [i][j],((reg_BTB[num_bank][j]._accurate >= _param->_accurate_limit) and |
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65 | (reg_BTB[num_bank][j]._address_dest_val == 1))); |
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66 | } |
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67 | } |
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68 | } |
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69 | // else |
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70 | // { |
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71 | // } |
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72 | |
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73 | log_end(Branch_Target_Buffer_Register,FUNCTION); |
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74 | }; |
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75 | |
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76 | }; // end namespace branch_target_buffer_register |
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77 | }; // end namespace branch_target_buffer |
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78 | }; // end namespace prediction_unit |
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79 | }; // end namespace front_end |
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80 | }; // end namespace multi_front_end |
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81 | }; // end namespace core |
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82 | |
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83 | }; // end namespace behavioural |
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84 | }; // end namespace morpheo |
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85 | #endif |
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