[78] | 1 | #ifdef SYSTEMC |
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| 2 | /* |
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| 3 | * $Id: Decod_genMealy.cpp 124 2009-06-17 12:11:25Z 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/Decod_unit/Decod/include/Decod.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 decod_unit { |
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| 17 | namespace decod { |
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| 18 | |
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| 19 | |
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| 20 | #undef FUNCTION |
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| 21 | #define FUNCTION "Decod::genMealy" |
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| 22 | void Decod::genMealy (void) |
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| 23 | { |
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[88] | 24 | log_begin(Decod,FUNCTION); |
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| 25 | log_function(Decod,FUNCTION,_name.c_str()); |
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[78] | 26 | |
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[123] | 27 | if (PORT_READ(in_NRESET)) |
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| 28 | { |
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[78] | 29 | //----------------------------------- |
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| 30 | // Initialization |
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| 31 | //----------------------------------- |
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[86] | 32 | Tcontrol_t context_event_val = false; |
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[78] | 33 | Tcontrol_t ifetch_ack [_param->_nb_context][_param->_max_nb_inst_fetch]; |
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| 34 | for (uint32_t i=0; i<_param->_nb_context; i++) |
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| 35 | for (uint32_t j=0; j<_param->_nb_inst_fetch[i]; j++) |
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| 36 | ifetch_ack [i][j] = false; |
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| 37 | |
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| 38 | Tcontrol_t predict_val [_param->_nb_inst_decod]; |
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| 39 | Tcontrol_t decod_val [_param->_nb_inst_decod]; |
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| 40 | for (uint32_t i=0; i<_param->_nb_inst_decod; i++) |
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| 41 | { |
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| 42 | decod_val [i] = false; |
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[88] | 43 | predict_val [i] = false; |
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[78] | 44 | } |
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| 45 | |
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| 46 | Tcontrol_t can_continue [_param->_nb_context]; |
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[110] | 47 | Tcontrol_t have_decod_branch [_param->_nb_context]; |
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[78] | 48 | |
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[124] | 49 | Tcontext_t CONTEXT_EVENT_CONTEXT_ID = 0; |
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| 50 | Tdepth_t CONTEXT_EVENT_DEPTH = 0; |
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| 51 | Tevent_type_t CONTEXT_EVENT_TYPE = 0; |
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| 52 | Tcontrol_t CONTEXT_EVENT_IS_DELAY_SLOT = 0; |
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| 53 | Tgeneral_data_t CONTEXT_EVENT_ADDRESS = 0; |
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| 54 | Tgeneral_data_t CONTEXT_EVENT_ADDRESS_EPCR = 0; |
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| 55 | |
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[78] | 56 | for (uint32_t i=0; i<_param->_nb_context; i++) |
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| 57 | { |
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| 58 | internal_CONTEXT_HAVE_TRANSACTION [i] = false; |
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| 59 | internal_CONTEXT_ADDRESS_PREVIOUS [i] = reg_CONTEXT_ADDRESS_PREVIOUS [i]; |
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| 60 | internal_CONTEXT_IS_DELAY_SLOT [i] = reg_CONTEXT_IS_DELAY_SLOT [i]; |
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[87] | 61 | |
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[78] | 62 | can_continue [i] = PORT_READ(in_CONTEXT_DECOD_ENABLE [i]); |
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[110] | 63 | have_decod_branch [i] = false; |
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[78] | 64 | } |
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| 65 | |
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| 66 | //----------------------------------- |
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| 67 | // Loop of decod |
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| 68 | //----------------------------------- |
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| 69 | // scan all decod "slot_out" |
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[88] | 70 | std::list<generic::priority::select_t> * select = _priority->select(); |
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| 71 | std::list<generic::priority::select_t>::iterator it=select->begin(); |
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[78] | 72 | for (uint32_t i=0; i<_param->_nb_inst_decod; i++) |
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| 73 | { |
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[119] | 74 | log_printf(TRACE,Decod,FUNCTION," * DECOD [%d]",i); |
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| 75 | |
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[124] | 76 | bool ifetch_val = false; |
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[88] | 77 | while ((it != select->end()) and // have a no scanned "slot_in" ? |
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[124] | 78 | // (decod_val [i] == false) and // have not a previous selected entry? |
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| 79 | (ifetch_val == false) and // not find ifetch instruction valid |
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[78] | 80 | (context_event_val == false)) // Have not a context_event (spr_access, exception, ...) |
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| 81 | { |
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[107] | 82 | // predict_val [i] = false; |
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[78] | 83 | |
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[88] | 84 | Tcontext_t x = it->grp; |
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| 85 | uint32_t y = it->elt; |
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[78] | 86 | |
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[119] | 87 | log_printf(TRACE,Decod,FUNCTION," * IFETCH [%d][%d]",x,y); |
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| 88 | log_printf(TRACE,Decod,FUNCTION," * in_IFETCH_VAL : %d",PORT_READ(in_IFETCH_VAL [x][y])); |
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| 89 | log_printf(TRACE,Decod,FUNCTION," * can_continue : %d",can_continue [x] ); |
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| 90 | |
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[78] | 91 | // Test if this instruction is valid |
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| 92 | if ((PORT_READ(in_IFETCH_VAL [x][y]) == 1) and // entry is valid |
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| 93 | (can_continue [x] == 1)) // context can decod instruction (have not a previous event) |
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| 94 | { |
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[119] | 95 | log_printf(TRACE,Decod,FUNCTION," * decod_ack : %d",PORT_READ(in_DECOD_ACK [i])); |
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[78] | 96 | |
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[124] | 97 | ifetch_val = true; |
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[78] | 98 | decod_val [i] = true; // fetch_val and decod_enable |
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| 99 | ifetch_ack [x][y] = PORT_READ(in_DECOD_ACK [i]); // fetch_val and decod_enable and decod_ack |
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| 100 | |
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[86] | 101 | Tgeneral_data_t addr = PORT_READ(in_IFETCH_ADDRESS [x])+y; |
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[78] | 102 | |
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| 103 | _decod_instruction->_instruction = PORT_READ(in_IFETCH_INSTRUCTION [x][y]); |
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| 104 | _decod_instruction->_context_id = x; |
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| 105 | _decod_instruction->_address_previous = internal_CONTEXT_ADDRESS_PREVIOUS [x]; |
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| 106 | _decod_instruction->_address = addr; //Compute the current address |
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[86] | 107 | _decod_instruction->_address_next = addr+1; |
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[78] | 108 | _decod_instruction->_is_delay_slot = internal_CONTEXT_IS_DELAY_SLOT [x]; |
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| 109 | |
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[88] | 110 | // Test IFetch exception |
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| 111 | Texception_t ifetch_exception = PORT_READ(in_IFETCH_EXCEPTION [x]); |
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[86] | 112 | |
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[88] | 113 | if (ifetch_exception == EXCEPTION_IFETCH_NONE) |
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| 114 | { |
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| 115 | // Decod ! |
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[119] | 116 | log_printf(TRACE,Decod,FUNCTION," * address : %.8x (%.8x)",addr,(addr<<2)); |
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| 117 | log_printf(TRACE,Decod,FUNCTION," * is_delay_slot : %d",internal_CONTEXT_IS_DELAY_SLOT [x]); |
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[88] | 118 | |
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| 119 | instruction_decod (_decod_instruction, _decod_param[x]); |
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[107] | 120 | |
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[119] | 121 | log_printf(TRACE,Decod,FUNCTION," * address_next : %.8x (%.8x)",_decod_instruction->_address_next,(_decod_instruction->_address_next<<2)); |
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[88] | 122 | } |
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| 123 | else |
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| 124 | { |
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| 125 | // No decod : nop |
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| 126 | instruction_l_nop (_decod_instruction, _decod_param[x]); |
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[78] | 127 | |
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[88] | 128 | _decod_instruction->_exception_use = EXCEPTION_USE_NONE; |
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| 129 | _decod_instruction->_exception = exception_ifetch_to_exception_decod(ifetch_exception); |
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| 130 | |
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| 131 | // INSTRUCTION_TLB |
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| 132 | // INSTRUCTION_PAGE |
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| 133 | // BUS_ERROR |
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| 134 | if (_decod_instruction->_is_delay_slot) |
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| 135 | _decod_instruction->_address_next = _decod_instruction->_address_previous; |
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| 136 | else |
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| 137 | _decod_instruction->_address_next = _decod_instruction->_address; |
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| 138 | |
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| 139 | _decod_instruction->_event_type = EVENT_TYPE_EXCEPTION; |
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| 140 | } |
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[78] | 141 | |
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[105] | 142 | Ttype_t type = _decod_instruction->_type; |
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[110] | 143 | // Depth current. If have decod a branch and i can continue : depth = depth_next |
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| 144 | Tdepth_t depth = (_param->_have_port_depth)?PORT_READ(in_CONTEXT_DEPTH [x]):0; |
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[88] | 145 | |
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[110] | 146 | if ((_param->_nb_branch_speculated[x] > 0) and have_decod_branch [x]) |
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| 147 | depth = (depth+1)%_param->_nb_branch_speculated[x]; |
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| 148 | |
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[78] | 149 | if (_param->_have_port_context_id) |
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| 150 | PORT_WRITE(out_DECOD_CONTEXT_ID [i], x); |
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| 151 | if (_param->_have_port_depth) |
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[88] | 152 | PORT_WRITE(out_DECOD_DEPTH [i], depth); |
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[78] | 153 | PORT_WRITE(out_DECOD_TYPE [i], type); |
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| 154 | PORT_WRITE(out_DECOD_OPERATION [i], _decod_instruction->_operation ); |
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[88] | 155 | PORT_WRITE(out_DECOD_NO_EXECUTE [i], _decod_instruction->_no_execute ); |
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[78] | 156 | PORT_WRITE(out_DECOD_IS_DELAY_SLOT [i], _decod_instruction->_is_delay_slot ); |
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[108] | 157 | #ifdef DEBUG |
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| 158 | PORT_WRITE(out_DECOD_ADDRESS [i], addr); |
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| 159 | #endif |
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[105] | 160 | // if ((type == TYPE_BRANCH) and |
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| 161 | // ((_decod_instruction->_branch_condition = BRANCH_CONDITION_FLAG_SET) or |
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| 162 | // (_decod_instruction->_branch_condition = BRANCH_CONDITION_FLAG_UNSET))) |
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| 163 | // PORT_WRITE(out_DECOD_ADDRESS_NEXT [i], _decod_instruction->_address+2); |
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| 164 | // else |
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| 165 | PORT_WRITE(out_DECOD_ADDRESS_NEXT [i], _decod_instruction->_address_next ); |
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[78] | 166 | PORT_WRITE(out_DECOD_HAS_IMMEDIAT [i], _decod_instruction->_has_immediat ); |
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| 167 | PORT_WRITE(out_DECOD_IMMEDIAT [i], _decod_instruction->_immediat ); |
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| 168 | PORT_WRITE(out_DECOD_READ_RA [i], _decod_instruction->_read_ra ); |
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| 169 | PORT_WRITE(out_DECOD_NUM_REG_RA [i], _decod_instruction->_num_reg_ra ); |
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| 170 | PORT_WRITE(out_DECOD_READ_RB [i], _decod_instruction->_read_rb ); |
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| 171 | PORT_WRITE(out_DECOD_NUM_REG_RB [i], _decod_instruction->_num_reg_rb ); |
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| 172 | PORT_WRITE(out_DECOD_READ_RC [i], _decod_instruction->_read_rc ); |
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| 173 | PORT_WRITE(out_DECOD_NUM_REG_RC [i], _decod_instruction->_num_reg_rc ); |
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[101] | 174 | PORT_WRITE(out_DECOD_WRITE_RD [i],(_decod_instruction->_num_reg_rd!=0)?_decod_instruction->_write_rd:0); |
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[78] | 175 | PORT_WRITE(out_DECOD_NUM_REG_RD [i], _decod_instruction->_num_reg_rd ); |
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| 176 | PORT_WRITE(out_DECOD_WRITE_RE [i], _decod_instruction->_write_re ); |
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| 177 | PORT_WRITE(out_DECOD_NUM_REG_RE [i], _decod_instruction->_num_reg_re ); |
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| 178 | PORT_WRITE(out_DECOD_EXCEPTION_USE [i], _decod_instruction->_exception_use ); |
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[88] | 179 | // PORT_WRITE(out_DECOD_EXCEPTION [i], _decod_instruction->_exception ); |
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[78] | 180 | |
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[101] | 181 | // Branch predictor can accept : the depth is valid |
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[119] | 182 | log_printf(TRACE,Decod,FUNCTION," * context_depth_val : %d",PORT_READ(in_CONTEXT_DEPTH_VAL [x])); |
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[101] | 183 | decod_val [i] &= PORT_READ(in_CONTEXT_DEPTH_VAL [x]); |
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| 184 | ifetch_ack [x][y] &= PORT_READ(in_CONTEXT_DEPTH_VAL [x]); |
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| 185 | |
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[78] | 186 | if (type == TYPE_BRANCH) |
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| 187 | { |
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[119] | 188 | log_printf(TRACE,Decod,FUNCTION," * Instruction is branch"); |
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| 189 | log_printf(TRACE,Decod,FUNCTION," * predict_val : %d",ifetch_ack [x][y]); |
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| 190 | log_printf(TRACE,Decod,FUNCTION," * predict_ack : %d",PORT_READ(in_PREDICT_ACK [i])); |
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| 191 | |
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| 192 | log_printf(TRACE,Decod,FUNCTION," * address src : %.8x (%.8x)",_decod_instruction->_address ,_decod_instruction->_address <<2); |
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| 193 | log_printf(TRACE,Decod,FUNCTION," * address dest : %.8x (%.8x)",_decod_instruction->_address_next,_decod_instruction->_address_next<<2); |
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[107] | 194 | |
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[110] | 195 | // test if have already decod an branch : one branch per context |
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| 196 | predict_val [i] = not have_decod_branch [x] and ifetch_ack [x][y] // and decod_val [i] |
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[78] | 197 | ; |
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[110] | 198 | decod_val [i] &= not have_decod_branch [x] and PORT_READ(in_PREDICT_ACK [i]);// predict_ack and fetch_val and decod_enable |
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| 199 | ifetch_ack [x][y] &= not have_decod_branch [x] and PORT_READ(in_PREDICT_ACK [i]);// predict_ack and fetch_val and decod_enable and decod_ack |
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[101] | 200 | |
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[110] | 201 | // can continue is set if direction is "not take" (also, continue is sequential order) |
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| 202 | |
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| 203 | // can_continue [x] = false; // one branch per context, the DS don't execute |
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[120] | 204 | can_continue [x]&= PORT_READ(in_PREDICT_CAN_CONTINUE [i]); // one branch per context, the DS don't execute |
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[110] | 205 | have_decod_branch [x] = true; |
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[120] | 206 | |
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| 207 | log_printf(TRACE,Decod,FUNCTION," * predict_can_continue : %d",PORT_READ(in_PREDICT_CAN_CONTINUE [i])); |
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| 208 | } |
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[78] | 209 | |
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[124] | 210 | if (_param->_have_port_context_id) |
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| 211 | PORT_WRITE(out_PREDICT_CONTEXT_ID [i],x); |
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| 212 | PORT_WRITE(out_PREDICT_MATCH_INST_IFETCH_PTR [i],y == ((_param->_have_port_inst_ifetch_ptr)?PORT_READ(in_IFETCH_INST_IFETCH_PTR [x]):0)); |
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| 213 | PORT_WRITE(out_PREDICT_BRANCH_STATE [i],PORT_READ(in_IFETCH_BRANCH_STATE [x])); |
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| 214 | if (_param->_have_port_depth) |
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| 215 | PORT_WRITE(out_PREDICT_BRANCH_UPDATE_PREDICTION_ID [i],PORT_READ(in_IFETCH_BRANCH_UPDATE_PREDICTION_ID [x])); |
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| 216 | PORT_WRITE(out_PREDICT_BRANCH_CONDITION [i],_decod_instruction->_branch_condition ); |
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| 217 | // PORT_WRITE(out_PREDICT_BRANCH_STACK_WRITE [i],_decod_instruction->_branch_stack_write); |
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| 218 | PORT_WRITE(out_PREDICT_BRANCH_DIRECTION [i],_decod_instruction->_branch_direction ); |
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| 219 | PORT_WRITE(out_PREDICT_ADDRESS_SRC [i],_decod_instruction->_address ); |
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| 220 | PORT_WRITE(out_PREDICT_ADDRESS_DEST [i],_decod_instruction->_address_next ); |
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| 221 | |
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[78] | 222 | Tevent_type_t event_type = _decod_instruction->_event_type; |
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| 223 | if (event_type != EVENT_TYPE_NONE) |
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| 224 | { |
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[119] | 225 | log_printf(TRACE,Decod,FUNCTION," * Instruction make an EVENT (%s)",toString(event_type).c_str()); |
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| 226 | log_printf(TRACE,Decod,FUNCTION," * context_event_ack : %d",PORT_READ(in_CONTEXT_EVENT_ACK)); |
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| 227 | |
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[78] | 228 | // speculative jump at the exception handler |
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| 229 | // if type = TYPE_BRANCH, also event_type == EVENT_TYPE_NONE |
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| 230 | context_event_val = ifetch_ack [x][y] // and decod_val [i] |
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| 231 | ; |
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| 232 | decod_val [i] &= PORT_READ(in_CONTEXT_EVENT_ACK);// context_event_ack and fetch_val and decod_enable |
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| 233 | ifetch_ack [x][y] &= PORT_READ(in_CONTEXT_EVENT_ACK);// context_event_ack and fetch_val and decod_enable and decod_ack |
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| 234 | |
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[124] | 235 | CONTEXT_EVENT_CONTEXT_ID = x; |
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| 236 | CONTEXT_EVENT_DEPTH = depth; |
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| 237 | CONTEXT_EVENT_TYPE = _decod_instruction->_event_type; |
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| 238 | CONTEXT_EVENT_IS_DELAY_SLOT = _decod_instruction->_is_delay_slot; |
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| 239 | CONTEXT_EVENT_ADDRESS = _decod_instruction->_address; |
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| 240 | CONTEXT_EVENT_ADDRESS_EPCR = _decod_instruction->_address_next ; |
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| 241 | |
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[78] | 242 | } |
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| 243 | |
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| 244 | // fetch_ack = |
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| 245 | // ((event_type == EVENT_TYPE_NONE) or ((event_type != EVENT_TYPE_NONE) and context_event_ack)) and |
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| 246 | // ((type == TYPE_BRANCH ) or ((type != TYPE_BRANCH ) and predict_ack )) and |
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| 247 | // fetch_val and decod_ack and decod_enable and true (is decod_val) |
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| 248 | |
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| 249 | // To compute the "next previous" address |
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| 250 | Tcontrol_t have_transaction = ifetch_ack [x][y]; |
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| 251 | |
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| 252 | internal_CONTEXT_HAVE_TRANSACTION [x] |= have_transaction; |
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| 253 | if (have_transaction) |
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| 254 | { |
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| 255 | internal_CONTEXT_ADDRESS_PREVIOUS [x] = addr; |
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| 256 | internal_CONTEXT_IS_DELAY_SLOT [x] = (type == TYPE_BRANCH); // next is a delay slot if current have branch type |
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| 257 | } |
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| 258 | |
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| 259 | can_continue [x] &= have_transaction; // to have a in order decod !!! if a previous instruction can decod, also next instruction can't decod. |
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[120] | 260 | |
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| 261 | log_printf(TRACE,Decod,FUNCTION," * have_transaction : %d",have_transaction); |
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| 262 | |
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[78] | 263 | } |
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[87] | 264 | |
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[88] | 265 | log_printf(TRACE,Decod,FUNCTION," - num_(decod, context, fetch) : %d %d %d",i, x, y); |
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[119] | 266 | log_printf(TRACE,Decod,FUNCTION," - ifetch_ack : %d",ifetch_ack [x][y]); |
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| 267 | log_printf(TRACE,Decod,FUNCTION," - context_event_val : %d",context_event_val ); |
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| 268 | log_printf(TRACE,Decod,FUNCTION," - predict_val : %d",predict_val [i] ); |
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| 269 | log_printf(TRACE,Decod,FUNCTION," - decod_val : %d",decod_val [i] ); |
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[78] | 270 | |
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| 271 | it ++; |
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| 272 | } |
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| 273 | } |
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[124] | 274 | |
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[78] | 275 | //----------------------------------- |
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| 276 | // Write output |
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| 277 | //----------------------------------- |
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| 278 | |
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| 279 | for (uint32_t i=0; i<_param->_nb_context; i++) |
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| 280 | for (uint32_t j=0; j<_param->_nb_inst_fetch[i]; j++) |
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| 281 | PORT_WRITE(out_IFETCH_ACK [i][j], ifetch_ack [i][j]); |
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| 282 | |
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| 283 | PORT_WRITE(out_CONTEXT_EVENT_VAL, context_event_val); |
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[124] | 284 | if (_param->_have_port_context_id) |
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| 285 | PORT_WRITE(out_CONTEXT_EVENT_CONTEXT_ID , CONTEXT_EVENT_CONTEXT_ID ); |
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| 286 | if (_param->_have_port_depth) |
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| 287 | PORT_WRITE(out_CONTEXT_EVENT_DEPTH , CONTEXT_EVENT_DEPTH ); |
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| 288 | PORT_WRITE(out_CONTEXT_EVENT_TYPE , CONTEXT_EVENT_TYPE ); |
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| 289 | PORT_WRITE(out_CONTEXT_EVENT_IS_DELAY_SLOT, CONTEXT_EVENT_IS_DELAY_SLOT); |
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| 290 | PORT_WRITE(out_CONTEXT_EVENT_ADDRESS , CONTEXT_EVENT_ADDRESS ); |
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| 291 | PORT_WRITE(out_CONTEXT_EVENT_ADDRESS_EPCR , CONTEXT_EVENT_ADDRESS_EPCR ); |
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[78] | 292 | |
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| 293 | for (uint32_t i=0; i<_param->_nb_inst_decod; i++) |
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| 294 | { |
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| 295 | PORT_WRITE(out_PREDICT_VAL [i], predict_val [i]); |
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| 296 | PORT_WRITE(out_DECOD_VAL [i], decod_val [i]); |
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[88] | 297 | |
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| 298 | #ifdef STATISTICS |
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| 299 | internal_DECOD_VAL [i] = decod_val [i]; |
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| 300 | #endif |
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[78] | 301 | } |
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[123] | 302 | } |
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| 303 | else |
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| 304 | { |
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| 305 | for (uint32_t i=0; i<_param->_nb_context; i++) |
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| 306 | { |
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| 307 | internal_CONTEXT_HAVE_TRANSACTION [i] = false; |
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| 308 | // internal_CONTEXT_ADDRESS_PREVIOUS [i] = reg_CONTEXT_ADDRESS_PREVIOUS [i]; |
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| 309 | // internal_CONTEXT_IS_DELAY_SLOT [i] = reg_CONTEXT_IS_DELAY_SLOT [i]; |
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| 310 | for (uint32_t j=0; j<_param->_nb_inst_fetch[i]; j++) |
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| 311 | PORT_WRITE(out_IFETCH_ACK [i][j], 0); |
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| 312 | } |
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[78] | 313 | |
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[123] | 314 | PORT_WRITE(out_CONTEXT_EVENT_VAL, 0); |
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| 315 | |
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| 316 | for (uint32_t i=0; i<_param->_nb_inst_decod; i++) |
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| 317 | { |
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| 318 | PORT_WRITE(out_PREDICT_VAL [i], 0); |
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| 319 | PORT_WRITE(out_DECOD_VAL [i], 0); |
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| 320 | |
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| 321 | #ifdef STATISTICS |
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| 322 | internal_DECOD_VAL [i] = 0; |
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| 323 | #endif |
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| 324 | } |
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| 325 | } |
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| 326 | |
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[88] | 327 | log_end(Decod,FUNCTION); |
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[78] | 328 | }; |
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| 329 | |
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| 330 | }; // end namespace decod |
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| 331 | }; // end namespace decod_unit |
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| 332 | }; // end namespace front_end |
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| 333 | }; // end namespace multi_front_end |
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| 334 | }; // end namespace core |
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| 335 | |
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| 336 | }; // end namespace behavioural |
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| 337 | }; // end namespace morpheo |
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| 338 | #endif |
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