1 | #ifdef SYSTEMC |
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2 | /* |
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3 | * $Id: Meta_Predictor_Glue_genMealy_update.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/Direction/Meta_Predictor/Meta_Predictor_Glue/include/Meta_Predictor_Glue.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 meta_predictor_glue { |
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20 | |
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21 | |
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22 | #undef FUNCTION |
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23 | #define FUNCTION "Meta_Predictor_Glue::genMealy_update" |
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24 | void Meta_Predictor_Glue::genMealy_update (void) |
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25 | { |
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26 | log_begin(Meta_Predictor_Glue,FUNCTION); |
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27 | log_function(Meta_Predictor_Glue,FUNCTION,_name.c_str()); |
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28 | |
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29 | if (PORT_READ(in_NRESET)) |
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30 | { |
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31 | for (uint32_t i=0; i<_param->_nb_inst_update; ++i) |
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32 | { |
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33 | Thistory_t history = PORT_READ(in_UPDATE_HISTORY [i]); |
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34 | Tcontrol_t history_val = PORT_READ(in_UPDATE_HISTORY_VAL [i]); |
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35 | Tcontrol_t direction = PORT_READ(in_UPDATE_DIRECTION [i]); |
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36 | |
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37 | switch (_param->_nb_predictor) |
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38 | { |
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39 | case 1 : |
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40 | { |
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41 | Thistory_t history_0 = history; |
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42 | Tcontrol_t direction_old_0 = (history_0>>_param->_predictor_history_shift_msb[0])&1; |
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43 | PORT_WRITE(out_UPDATE_PREDICTOR_HISTORY [0][i],history_0); |
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44 | PORT_WRITE(out_UPDATE_PREDICTOR_HISTORY_VAL [0][i],history_val); |
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45 | PORT_WRITE(out_UPDATE_PREDICTOR_DIRECTION [0][i],direction); |
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46 | if (_param->_predictor_update_on_prediction [0]) |
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47 | PORT_WRITE(out_UPDATE_PREDICTOR_MISS [0][i],direction xor direction_old_0); |
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48 | |
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49 | break; |
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50 | } |
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51 | case 3 : |
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52 | { |
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53 | /* |
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54 | dir_0 dir_1 dir_2 | good_dir || next_dir_2 |
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55 | ------------------+-----------++----------- |
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56 | 0 0 0 | 0 || no change |
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57 | 1 0 0 | 0 || 1 select pred_0 but miss |
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58 | 0 1 0 | 0 || 0 select pred_0 and hit |
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59 | 1 1 0 | 0 || no change |
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60 | 0 0 1 | 0 || no change |
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61 | 1 0 1 | 0 || 1 select pred_1 and hit |
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62 | 0 1 1 | 0 || 0 select pred_1 but miss |
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63 | 1 1 1 | 0 || no change |
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64 | 0 0 0 | 1 || no change |
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65 | 1 0 0 | 1 || 0 select pred_0 and hit |
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66 | 0 1 0 | 1 || 1 select pred_0 but miss |
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67 | 1 1 0 | 1 || no change |
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68 | 0 0 1 | 1 || no change |
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69 | 1 0 1 | 1 || 0 select pred_1 but miss |
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70 | 0 1 1 | 1 || 1 select pred_1 and hit |
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71 | 1 1 1 | 1 || no change |
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72 | |
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73 | next_dir_2 = (good_dir and dir_1) or (not good_dir and dir_0) |
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74 | */ |
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75 | |
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76 | Thistory_t history_0 = (history >>_param->_predictor_history_shift [0])&_param->_predictor_history_mask [0]; |
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77 | Thistory_t history_1 = (history >>_param->_predictor_history_shift [1])&_param->_predictor_history_mask [1]; |
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78 | Thistory_t history_2 = (history >>_param->_predictor_history_shift [2])&_param->_predictor_history_mask [2]; |
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79 | Tcontrol_t direction_old_0 = (history_0>>_param->_predictor_history_shift_msb[0])&1; |
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80 | Tcontrol_t direction_old_1 = (history_1>>_param->_predictor_history_shift_msb[1])&1; |
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81 | Tcontrol_t direction_old_2 = (history_2>>_param->_predictor_history_shift_msb[2])&1; |
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82 | Tcontrol_t direction_new_2 = direction_old_2; |
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83 | |
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84 | // Test if two predictor is different |
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85 | if (direction_old_0 xor direction_old_1) |
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86 | direction_new_2 = (( direction and direction_old_1) or |
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87 | (not direction and direction_old_0)); |
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88 | |
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89 | PORT_WRITE(out_UPDATE_PREDICTOR_DIRECTION [0][i],direction); |
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90 | PORT_WRITE(out_UPDATE_PREDICTOR_DIRECTION [1][i],direction); |
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91 | PORT_WRITE(out_UPDATE_PREDICTOR_DIRECTION [2][i],direction_new_2); |
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92 | |
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93 | if (_param->_predictor_update_on_prediction [0]) |
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94 | PORT_WRITE(out_UPDATE_PREDICTOR_MISS [0][i],direction xor direction_old_0); |
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95 | if (_param->_predictor_update_on_prediction [1]) |
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96 | PORT_WRITE(out_UPDATE_PREDICTOR_MISS [1][i],direction xor direction_old_1); |
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97 | if (_param->_predictor_update_on_prediction [2]) |
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98 | PORT_WRITE(out_UPDATE_PREDICTOR_MISS [2][i],direction_new_2 xor direction_old_2); |
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99 | |
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100 | PORT_WRITE(out_UPDATE_PREDICTOR_HISTORY [0][i],history_0); |
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101 | PORT_WRITE(out_UPDATE_PREDICTOR_HISTORY [1][i],history_1); |
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102 | PORT_WRITE(out_UPDATE_PREDICTOR_HISTORY [2][i],history_2); |
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103 | |
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104 | PORT_WRITE(out_UPDATE_PREDICTOR_HISTORY_VAL [0][i],history_val); |
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105 | PORT_WRITE(out_UPDATE_PREDICTOR_HISTORY_VAL [1][i],history_val); |
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106 | PORT_WRITE(out_UPDATE_PREDICTOR_HISTORY_VAL [2][i],history_val); |
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107 | |
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108 | break; |
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109 | } |
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110 | default : |
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111 | { |
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112 | break; |
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113 | } |
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114 | } |
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115 | } |
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116 | } |
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117 | // else |
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118 | // { |
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119 | // // RESET |
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120 | // } |
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121 | |
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122 | log_end(Meta_Predictor_Glue,FUNCTION); |
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123 | }; |
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124 | |
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125 | }; // end namespace meta_predictor_glue |
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126 | }; // end namespace meta_predictor |
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127 | }; // end namespace direction |
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128 | }; // end namespace prediction_unit |
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129 | }; // end namespace front_end |
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130 | }; // end namespace multi_front_end |
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131 | }; // end namespace core |
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132 | |
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133 | }; // end namespace behavioural |
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134 | }; // end namespace morpheo |
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135 | #endif |
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