1 | #ifdef SYSTEMC |
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2 | /* |
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3 | * $Id: Two_Level_Branch_Predictor_genMealy_predict.cpp 115 2009-04-20 21:29:17Z 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/Direction/Meta_Predictor/Two_Level_Branch_Predictor/include/Two_Level_Branch_Predictor.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 direction { |
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18 | namespace meta_predictor { |
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19 | namespace two_level_branch_predictor { |
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20 | |
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21 | |
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22 | #undef FUNCTION |
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23 | #define FUNCTION "Two_Level_Branch_Predictor::genMealy_predict" |
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24 | void Two_Level_Branch_Predictor::genMealy_predict (void) |
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25 | { |
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26 | log_begin(Two_Level_Branch_Predictor,FUNCTION); |
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27 | log_function(Two_Level_Branch_Predictor,FUNCTION,_name.c_str()); |
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28 | |
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29 | // =================================================================== |
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30 | // =====[ PREDICT ]=================================================== |
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31 | // =================================================================== |
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32 | |
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33 | for (uint32_t i=0; i<_param->_nb_inst_predict; ++i) |
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34 | // if (PORT_READ(in_PREDICT_VAL[i])) |
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35 | { |
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36 | log_printf(TRACE,Two_Level_Branch_Predictor,FUNCTION," * PREDICT [%d]",i); |
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37 | |
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38 | Taddress_t address = PORT_READ(in_PREDICT_ADDRESS [i]); |
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39 | Thistory_t history = 0; |
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40 | Tcontrol_t direction; |
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41 | |
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42 | log_printf(TRACE,Two_Level_Branch_Predictor,FUNCTION," * address : 0x%.8x",address); |
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43 | |
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44 | Thistory_t pht_bht_history = 0; |
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45 | if (_param->_have_bht) |
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46 | { |
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47 | Thistory_t bht_num_reg = address & _param->_bht_address_mask; |
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48 | Thistory_t bht_history = reg_BHT [bht_num_reg]; |
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49 | pht_bht_history = bht_history; |
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50 | |
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51 | log_printf(TRACE,Two_Level_Branch_Predictor,FUNCTION," * bht_history : 0x%x",bht_history); |
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52 | log_printf(TRACE,Two_Level_Branch_Predictor,FUNCTION," * bht_num_reg : %d",bht_num_reg); |
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53 | |
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54 | history = (bht_history << _param->_bht_history_shift )&_param->_bht_history_mask ; |
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55 | direction = (bht_history >> (_param->_bht_size_shifter-1))&1; |
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56 | |
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57 | if (_param->_update_on_prediction) |
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58 | internal_PREDICT_BHT_NUM_REG [i] = bht_num_reg; |
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59 | } |
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60 | |
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61 | if (_param->_have_pht) |
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62 | { |
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63 | Thistory_t pht_num_bank= (address>>_param->_pht_address_bank_shift )&_param->_pht_address_bank_mask; |
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64 | Thistory_t pht_num_reg = (pht_bht_history xor ((address&_param->_pht_address_share_mask)<<_param->_pht_address_share_shift)); |
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65 | |
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66 | log_printf(TRACE,Two_Level_Branch_Predictor,FUNCTION," * bht_history : 0x%x",pht_bht_history); |
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67 | log_printf(TRACE,Two_Level_Branch_Predictor,FUNCTION," * pht_num_reg : %d",pht_num_reg); |
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68 | log_printf(TRACE,Two_Level_Branch_Predictor,FUNCTION," * pht_num_bank : %d",pht_num_bank); |
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69 | |
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70 | Thistory_t pht_history = reg_PHT [pht_num_bank][pht_num_reg]; |
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71 | |
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72 | log_printf(TRACE,Two_Level_Branch_Predictor,FUNCTION," * pht_history : 0x%x",pht_history); |
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73 | |
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74 | history |= (pht_history << _param->_pht_history_shift )&_param->_pht_history_mask; |
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75 | direction = (pht_history >> (_param->_pht_size_counter-1))&1; |
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76 | |
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77 | if (_param->_update_on_prediction) |
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78 | { |
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79 | internal_PREDICT_PHT_NUM_REG [i] = pht_num_reg; |
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80 | internal_PREDICT_PHT_NUM_BANK[i] = pht_num_bank; |
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81 | } |
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82 | } |
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83 | |
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84 | log_printf(TRACE,Two_Level_Branch_Predictor,FUNCTION," * direction : %d",direction); |
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85 | log_printf(TRACE,Two_Level_Branch_Predictor,FUNCTION," * history : 0x%x",history); |
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86 | |
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87 | PORT_WRITE(out_PREDICT_DIRECTION [i],direction); |
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88 | PORT_WRITE(out_PREDICT_HISTORY [i],history ); |
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89 | } |
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90 | |
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91 | log_end(Two_Level_Branch_Predictor,FUNCTION); |
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92 | }; |
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93 | |
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94 | }; // end namespace two_level_branch_predictor |
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95 | }; // end namespace meta_predictor |
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96 | }; // end namespace direction |
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97 | }; // end namespace prediction_unit |
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98 | }; // end namespace front_end |
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99 | }; // end namespace multi_front_end |
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100 | }; // end namespace core |
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101 | |
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102 | }; // end namespace behavioural |
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103 | }; // end namespace morpheo |
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104 | #endif |
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