[119] | 1 | |
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[111] | 2 | #ifdef SYSTEMC |
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| 3 | /* |
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| 4 | * $Id: Two_Level_Branch_Predictor_genMealy_predict.cpp 124 2009-06-17 12:11:25Z rosiere $ |
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| 5 | * |
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| 6 | * [ Description ] |
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| 7 | * |
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| 8 | */ |
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| 9 | |
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| 10 | #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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[119] | 11 | // #include <assert.h> |
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[111] | 12 | |
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| 13 | namespace morpheo { |
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| 14 | namespace behavioural { |
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| 15 | namespace core { |
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| 16 | namespace multi_front_end { |
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| 17 | namespace front_end { |
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| 18 | namespace prediction_unit { |
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| 19 | namespace direction { |
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| 20 | namespace meta_predictor { |
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| 21 | namespace two_level_branch_predictor { |
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| 22 | |
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| 23 | |
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| 24 | #undef FUNCTION |
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| 25 | #define FUNCTION "Two_Level_Branch_Predictor::genMealy_predict" |
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| 26 | void Two_Level_Branch_Predictor::genMealy_predict (void) |
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| 27 | { |
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| 28 | log_begin(Two_Level_Branch_Predictor,FUNCTION); |
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| 29 | log_function(Two_Level_Branch_Predictor,FUNCTION,_name.c_str()); |
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| 30 | |
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[123] | 31 | if (PORT_READ(in_NRESET)) |
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| 32 | { |
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[111] | 33 | // =================================================================== |
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| 34 | // =====[ PREDICT ]=================================================== |
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| 35 | // =================================================================== |
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| 36 | |
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| 37 | for (uint32_t i=0; i<_param->_nb_inst_predict; ++i) |
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| 38 | // if (PORT_READ(in_PREDICT_VAL[i])) |
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| 39 | { |
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| 40 | log_printf(TRACE,Two_Level_Branch_Predictor,FUNCTION," * PREDICT [%d]",i); |
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| 41 | |
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| 42 | Taddress_t address = PORT_READ(in_PREDICT_ADDRESS [i]); |
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| 43 | Thistory_t history = 0; |
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[124] | 44 | Tcontrol_t direction = 0; |
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[111] | 45 | |
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| 46 | log_printf(TRACE,Two_Level_Branch_Predictor,FUNCTION," * address : 0x%.8x",address); |
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| 47 | |
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| 48 | Thistory_t pht_bht_history = 0; |
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| 49 | if (_param->_have_bht) |
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| 50 | { |
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| 51 | Thistory_t bht_num_reg = address & _param->_bht_address_mask; |
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[119] | 52 | |
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| 53 | // #ifdef DEBUG_TEST |
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| 54 | // assert(bht_num_reg < _param->_bht_nb_shifter); |
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| 55 | // #endif |
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| 56 | |
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[111] | 57 | Thistory_t bht_history = reg_BHT [bht_num_reg]; |
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| 58 | pht_bht_history = bht_history; |
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| 59 | |
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[124] | 60 | log_printf(TRACE,Two_Level_Branch_Predictor,FUNCTION," * bht_history : 0x%llx",bht_history); |
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| 61 | log_printf(TRACE,Two_Level_Branch_Predictor,FUNCTION," * bht_num_reg : %lld",bht_num_reg); |
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[111] | 62 | |
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[115] | 63 | history = (bht_history << _param->_bht_history_shift )&_param->_bht_history_mask ; |
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[111] | 64 | direction = (bht_history >> (_param->_bht_size_shifter-1))&1; |
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| 65 | |
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| 66 | if (_param->_update_on_prediction) |
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| 67 | internal_PREDICT_BHT_NUM_REG [i] = bht_num_reg; |
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| 68 | } |
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| 69 | |
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| 70 | if (_param->_have_pht) |
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| 71 | { |
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[115] | 72 | Thistory_t pht_num_bank= (address>>_param->_pht_address_bank_shift )&_param->_pht_address_bank_mask; |
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| 73 | Thistory_t pht_num_reg = (pht_bht_history xor ((address&_param->_pht_address_share_mask)<<_param->_pht_address_share_shift)); |
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| 74 | |
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[124] | 75 | log_printf(TRACE,Two_Level_Branch_Predictor,FUNCTION," * bht_history : 0x%llx",pht_bht_history); |
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| 76 | log_printf(TRACE,Two_Level_Branch_Predictor,FUNCTION," * pht_num_reg : %lld",pht_num_reg); |
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| 77 | log_printf(TRACE,Two_Level_Branch_Predictor,FUNCTION," * pht_num_bank : %lld",pht_num_bank); |
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[115] | 78 | |
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| 79 | Thistory_t pht_history = reg_PHT [pht_num_bank][pht_num_reg]; |
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[111] | 80 | |
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[124] | 81 | log_printf(TRACE,Two_Level_Branch_Predictor,FUNCTION," * pht_history : 0x%llx",pht_history); |
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[115] | 82 | |
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| 83 | history |= (pht_history << _param->_pht_history_shift )&_param->_pht_history_mask; |
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[111] | 84 | direction = (pht_history >> (_param->_pht_size_counter-1))&1; |
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| 85 | |
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| 86 | if (_param->_update_on_prediction) |
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| 87 | { |
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| 88 | internal_PREDICT_PHT_NUM_REG [i] = pht_num_reg; |
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| 89 | internal_PREDICT_PHT_NUM_BANK[i] = pht_num_bank; |
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| 90 | } |
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| 91 | } |
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| 92 | |
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| 93 | log_printf(TRACE,Two_Level_Branch_Predictor,FUNCTION," * direction : %d",direction); |
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[124] | 94 | log_printf(TRACE,Two_Level_Branch_Predictor,FUNCTION," * history : 0x%llx",history); |
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[111] | 95 | |
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| 96 | PORT_WRITE(out_PREDICT_DIRECTION [i],direction); |
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| 97 | PORT_WRITE(out_PREDICT_HISTORY [i],history ); |
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| 98 | } |
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[123] | 99 | } |
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[111] | 100 | |
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| 101 | log_end(Two_Level_Branch_Predictor,FUNCTION); |
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| 102 | }; |
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| 103 | |
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| 104 | }; // end namespace two_level_branch_predictor |
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| 105 | }; // end namespace meta_predictor |
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| 106 | }; // end namespace direction |
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| 107 | }; // end namespace prediction_unit |
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| 108 | }; // end namespace front_end |
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| 109 | }; // end namespace multi_front_end |
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| 110 | }; // end namespace core |
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| 111 | |
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| 112 | }; // end namespace behavioural |
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| 113 | }; // end namespace morpheo |
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| 114 | #endif |
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