1 | /**CFile*********************************************************************** |
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2 | |
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3 | FileName [satConflict.c] |
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4 | |
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5 | PackageName [sat] |
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6 | |
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7 | Synopsis [Routines for sat conflict analysism and unsat proof generation |
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8 | for both CNF format and AIG format] |
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9 | |
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10 | Author [HoonSang Jin, Bing Li] |
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11 | |
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12 | Copyright [ This file was created at the University of Colorado at |
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13 | Boulder. The University of Colorado at Boulder makes no warranty |
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14 | about the suitability of this software for any purpose. It is |
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15 | presented on an AS IS basis.] |
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16 | |
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17 | |
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18 | ******************************************************************************/ |
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19 | |
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20 | #include "satInt.h" |
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21 | #include "puresatInt.h" |
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22 | |
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23 | static char rcsid[] UNUSED = "$Id: satConflict.c,v 1.31 2009/04/11 18:26:37 fabio Exp $"; |
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24 | |
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25 | static satManager_t *SATcm; |
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26 | |
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27 | /*---------------------------------------------------------------------------*/ |
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28 | /* Constant declarations */ |
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29 | /*---------------------------------------------------------------------------*/ |
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30 | |
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31 | /**AutomaticStart*************************************************************/ |
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32 | |
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33 | /*---------------------------------------------------------------------------*/ |
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34 | /* Static function prototypes */ |
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35 | /*---------------------------------------------------------------------------*/ |
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36 | |
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37 | static int levelCompare( const void * node1, const void * node2); |
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38 | |
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39 | /**AutomaticEnd***************************************************************/ |
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40 | |
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41 | |
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42 | /*---------------------------------------------------------------------------*/ |
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43 | /* Definition of exported functions */ |
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44 | /*---------------------------------------------------------------------------*/ |
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45 | |
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46 | |
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47 | /**Function******************************************************************** |
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48 | |
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49 | Synopsis [ Conflict Analysis] |
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50 | |
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51 | Description [ Conflict Analysis] |
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52 | |
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53 | SideEffects [] |
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54 | |
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55 | SeeAlso [] |
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56 | |
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57 | ******************************************************************************/ |
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58 | |
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59 | int |
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60 | sat_ConflictAnalysis( |
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61 | satManager_t *cm, |
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62 | satLevel_t *d) |
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63 | { |
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64 | satStatistics_t *stats; |
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65 | satOption_t *option; |
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66 | satArray_t *clauseArray; |
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67 | int objectFlag; |
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68 | int bLevel; |
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69 | long fdaLit, conflicting; |
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70 | |
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71 | |
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72 | conflicting = d->conflict; |
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73 | |
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74 | if(d->level == 0) { |
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75 | /** Bing : UNSAT core generation */ |
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76 | if(cm->option->coreGeneration) |
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77 | sat_ConflictAnalysisForCoreGen(cm, d); |
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78 | cm->currentDecision--; |
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79 | return (-1); |
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80 | } |
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81 | |
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82 | stats = cm->each; |
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83 | option = cm->option; |
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84 | |
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85 | |
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86 | stats->nBacktracks++; |
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87 | |
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88 | clauseArray = cm->auxArray; |
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89 | |
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90 | bLevel = 0; |
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91 | fdaLit = -1; |
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92 | clauseArray->num = 0; |
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93 | |
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94 | /* Find Unique Implication Point */ |
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95 | |
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96 | if(option->RT) |
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97 | sat_FindUIPWithRT(cm, clauseArray, d, &objectFlag, &bLevel, &fdaLit); |
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98 | else |
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99 | sat_FindUIP(cm, clauseArray, d, &objectFlag, &bLevel, &fdaLit); |
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100 | stats->nNonchonologicalBacktracks += (d->level - bLevel); |
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101 | |
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102 | |
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103 | if(clauseArray->num == 0) { |
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104 | sat_PrintImplicationGraph(cm, d); |
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105 | sat_PrintNode(cm, conflicting); |
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106 | } |
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107 | |
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108 | /* If we could find UIP then it is critical error... |
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109 | * at lease the decision node has to be detected as UIP. |
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110 | */ |
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111 | if(fdaLit == -1) { |
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112 | fprintf(cm->stdOut, "%s ERROR : Illegal unit literal\n", cm->comment); |
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113 | fflush(cm->stdOut); |
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114 | sat_PrintNode(cm, conflicting); |
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115 | sat_PrintImplicationGraph(cm, d); |
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116 | sat_PrintDotForConflict(cm, d, conflicting, 0); |
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117 | exit(0); |
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118 | } |
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119 | |
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120 | if(bLevel && cm->lowestBacktrackLevel > bLevel) |
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121 | cm->lowestBacktrackLevel = bLevel; |
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122 | |
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123 | bLevel = sat_AddConflictClauseAndBacktrack( |
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124 | cm, clauseArray, d, fdaLit, bLevel, objectFlag, 0); |
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125 | |
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126 | return(bLevel); |
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127 | } |
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128 | |
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129 | /**Function******************************************************************** |
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130 | |
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131 | Synopsis [ Conflict Analysis for lifting instance] |
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132 | |
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133 | Description [ Conflict Analysis for lifting instance] |
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134 | |
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135 | SideEffects [] |
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136 | |
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137 | SeeAlso [] |
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138 | |
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139 | ******************************************************************************/ |
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140 | |
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141 | int |
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142 | sat_ConflictAnalysisForLifting( |
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143 | satManager_t *cm, |
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144 | satLevel_t *d) |
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145 | { |
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146 | satStatistics_t *stats; |
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147 | satOption_t *option; |
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148 | satArray_t *clauseArray; |
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149 | int objectFlag; |
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150 | int bLevel; |
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151 | long fdaLit, conflicting; |
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152 | |
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153 | |
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154 | conflicting = d->conflict; |
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155 | |
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156 | if(d->level == 0) { |
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157 | cm->currentDecision--; |
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158 | return (-1); |
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159 | } |
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160 | |
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161 | stats = cm->each; |
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162 | option = cm->option; |
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163 | |
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164 | |
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165 | stats->nBacktracks++; |
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166 | |
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167 | clauseArray = cm->auxArray; |
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168 | |
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169 | bLevel = 0; |
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170 | fdaLit = -1; |
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171 | clauseArray->num = 0; |
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172 | |
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173 | /* Find Unique Implication Point */ |
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174 | sat_FindUIP(cm, clauseArray, d, &objectFlag, &bLevel, &fdaLit); |
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175 | stats->nNonchonologicalBacktracks += (d->level - bLevel); |
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176 | |
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177 | |
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178 | if(clauseArray->num == 0) { |
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179 | sat_PrintImplicationGraph(cm, d); |
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180 | sat_PrintNode(cm, conflicting); |
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181 | } |
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182 | |
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183 | /* If we could find UIP then it is critical error... |
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184 | * at lease the decision node has to be detected as UIP. |
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185 | */ |
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186 | if(fdaLit == -1) { |
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187 | fprintf(cm->stdOut, "%s ERROR : Illegal unit literal\n", cm->comment); |
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188 | fflush(cm->stdOut); |
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189 | sat_PrintNode(cm, conflicting); |
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190 | sat_PrintImplicationGraph(cm, d); |
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191 | sat_PrintDotForConflict(cm, d, conflicting, 0); |
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192 | exit(0); |
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193 | } |
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194 | |
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195 | if(bLevel && cm->lowestBacktrackLevel > bLevel) |
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196 | cm->lowestBacktrackLevel = bLevel; |
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197 | |
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198 | bLevel = sat_AddConflictClauseAndBacktrackForLifting( |
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199 | cm, clauseArray, d, fdaLit, bLevel, objectFlag, 0); |
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200 | |
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201 | return(bLevel); |
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202 | } |
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203 | /**Function******************************************************************** |
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204 | |
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205 | Synopsis [ Conflict Analysis on blocking clause] |
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206 | |
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207 | Description [ Conflict Analysis on blocking clause] |
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208 | |
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209 | SideEffects [] |
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210 | |
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211 | SeeAlso [] |
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212 | |
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213 | ******************************************************************************/ |
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214 | |
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215 | int |
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216 | sat_ConflictAnalysisWithBlockingClause( |
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217 | satManager_t *cm, |
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218 | satLevel_t *d) |
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219 | { |
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220 | satStatistics_t *stats; |
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221 | satOption_t *option; |
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222 | satArray_t *clauseArray; |
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223 | int objectFlag; |
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224 | int bLevel; |
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225 | long fdaLit, conflicting; |
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226 | |
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227 | |
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228 | conflicting = d->conflict; |
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229 | |
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230 | if(d->level == 0) { |
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231 | cm->currentDecision--; |
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232 | return (-1); |
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233 | } |
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234 | |
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235 | stats = cm->each; |
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236 | option = cm->option; |
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237 | |
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238 | |
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239 | stats->nBacktracks++; |
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240 | |
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241 | clauseArray = cm->auxArray; |
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242 | |
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243 | bLevel = 0; |
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244 | fdaLit = -1; |
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245 | clauseArray->num = 0; |
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246 | |
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247 | /* Find Unique Implication Point */ |
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248 | sat_FindUIP(cm, clauseArray, d, &objectFlag, &bLevel, &fdaLit); |
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249 | stats->nNonchonologicalBacktracks += (d->level - bLevel); |
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250 | |
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251 | |
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252 | if(clauseArray->num == 0) { |
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253 | sat_PrintImplicationGraph(cm, d); |
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254 | sat_PrintNode(cm, conflicting); |
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255 | } |
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256 | |
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257 | /* If we could find UIP then it is critical error... |
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258 | * at lease the decision node has to be detected as UIP. |
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259 | */ |
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260 | if(fdaLit == -1) { |
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261 | fprintf(cm->stdOut, "%s ERROR : Illegal unit literal\n", cm->comment); |
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262 | fflush(cm->stdOut); |
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263 | sat_PrintNode(cm, conflicting); |
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264 | sat_PrintImplicationGraph(cm, d); |
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265 | sat_PrintDotForConflict(cm, d, conflicting, 0); |
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266 | exit(0); |
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267 | } |
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268 | |
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269 | if(bLevel && cm->lowestBacktrackLevel > bLevel) |
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270 | cm->lowestBacktrackLevel = bLevel; |
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271 | |
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272 | bLevel = sat_AddConflictClauseWithNoScoreAndBacktrack( |
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273 | cm, clauseArray, d, fdaLit, bLevel, objectFlag, 0); |
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274 | |
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275 | return(bLevel); |
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276 | } |
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277 | |
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278 | /**Function******************************************************************** |
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279 | |
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280 | Synopsis [ Strong Conflict Analysis.] |
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281 | |
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282 | Description [ Strong Conflict Analysis.] |
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283 | |
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284 | SideEffects [] |
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285 | |
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286 | SeeAlso [] |
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287 | |
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288 | ******************************************************************************/ |
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289 | int |
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290 | sat_StrongConflictAnalysis( |
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291 | satManager_t *cm, |
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292 | satLevel_t *d) |
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293 | { |
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294 | satStatistics_t *stats; |
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295 | satOption_t *option; |
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296 | satArray_t *clauseArray; |
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297 | int objectFlag; |
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298 | int bLevel; |
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299 | long fdaLit, conflicting; |
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300 | |
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301 | |
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302 | conflicting = d->conflict; |
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303 | |
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304 | if(d->level == 0) { |
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305 | /** Bing : UNSAT core generation */ |
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306 | if(cm->option->coreGeneration) |
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307 | sat_ConflictAnalysisForCoreGen(cm, d); |
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308 | cm->currentDecision--; |
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309 | return (-1); |
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310 | } |
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311 | |
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312 | stats = cm->each; |
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313 | option = cm->option; |
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314 | |
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315 | |
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316 | stats->nBacktracks++; |
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317 | |
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318 | if(SATflags(conflicting) & IsCNFMask) { |
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319 | SATnumConflict(conflicting) += 1; |
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320 | } |
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321 | |
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322 | clauseArray = cm->auxArray; |
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323 | |
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324 | bLevel = 0; |
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325 | fdaLit = -1; |
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326 | clauseArray->num = 0; |
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327 | |
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328 | /* Find Unique Implication Point */ |
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329 | sat_FindUIPAndNonUIP(cm, clauseArray, d, &objectFlag, &bLevel, &fdaLit); |
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330 | stats->nNonchonologicalBacktracks += (d->level - bLevel); |
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331 | |
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332 | |
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333 | if(clauseArray->num == 0) { |
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334 | sat_PrintImplicationGraph(cm, d); |
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335 | sat_PrintNode(cm, conflicting); |
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336 | } |
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337 | |
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338 | /* If we could find UIP then it is critical error... |
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339 | * at lease the decision node has to be detected as UIP. |
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340 | */ |
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341 | if(fdaLit == -1) { |
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342 | fprintf(cm->stdOut, "%s ERROR : Illegal unit literal\n", cm->comment); |
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343 | fflush(cm->stdOut); |
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344 | sat_PrintNode(cm, conflicting); |
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345 | sat_PrintImplicationGraph(cm, d); |
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346 | sat_PrintDotForConflict(cm, d, conflicting, 0); |
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347 | exit(0); |
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348 | } |
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349 | |
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350 | if(bLevel && cm->lowestBacktrackLevel > bLevel) |
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351 | cm->lowestBacktrackLevel = bLevel; |
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352 | |
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353 | bLevel = sat_AddConflictClauseAndBacktrack( |
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354 | cm, clauseArray, d, fdaLit, bLevel, objectFlag, 1); |
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355 | |
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356 | return(bLevel); |
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357 | } |
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358 | |
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359 | /**Function******************************************************************** |
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360 | |
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361 | Synopsis [ Add conflict clause and backtrack.] |
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362 | |
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363 | Description [ Add conflict clause and backtrack.] |
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364 | |
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365 | SideEffects [] |
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366 | |
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367 | SeeAlso [] |
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368 | |
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369 | ******************************************************************************/ |
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370 | int |
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371 | sat_AddConflictClauseAndBacktrack( |
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372 | satManager_t *cm, |
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373 | satArray_t *clauseArray, |
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374 | satLevel_t *d, |
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375 | long fdaLit, |
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376 | int bLevel, |
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377 | int objectFlag, |
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378 | int strongFlag) |
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379 | { |
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380 | int inverted; |
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381 | long conflicting, learned; |
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382 | satOption_t *option; |
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383 | satStatistics_t *stats; |
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384 | satArray_t *nClauseArray; |
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385 | |
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386 | RTManager_t * rm = cm->rm; |
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387 | |
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388 | option = cm->option; |
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389 | stats = cm->each; |
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390 | |
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391 | inverted = SATisInverted(fdaLit); |
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392 | fdaLit = SATnormalNode(fdaLit); |
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393 | |
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394 | conflicting = d->conflict; |
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395 | |
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396 | if(option->verbose > 2) { |
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397 | if(option->verbose > 4) |
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398 | sat_PrintNode(cm, conflicting); |
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399 | fprintf(cm->stdOut, "conflict at %3d on %6ld bLevel %d UnitLit ", |
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400 | d->level, conflicting, bLevel); |
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401 | sat_PrintNodeAlone(cm, fdaLit); |
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402 | fprintf(cm->stdOut, "\n"); |
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403 | } |
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404 | |
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405 | d->conflict = 0; |
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406 | |
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407 | /* unit literal conflict clause */ |
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408 | if(clauseArray->num == 1) { |
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409 | learned = sat_AddUnitConflictClause(cm, clauseArray, objectFlag); |
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410 | stats->nUnitConflictCl++; |
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411 | cm->currentTopConflict = cm->literals->last-1; |
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412 | cm->currentTopConflictCount = 0; |
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413 | |
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414 | sat_Backtrack(cm, 0); |
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415 | |
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416 | if(SATlevel(fdaLit) == 0) { |
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417 | if(cm->option->coreGeneration){ |
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418 | if(cm->option->RT){ |
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419 | st_insert(cm->anteTable,(char*)SATnormalNode(fdaLit),(char*)learned); |
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420 | |
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421 | st_insert(cm->RTreeTable, (char *)learned, (char *)rm->root); |
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422 | RT_oriClsIdx(rm->root) = learned; |
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423 | } |
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424 | else{ |
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425 | st_insert(cm->anteTable,(char*)SATnormalNode(fdaLit),(char*)learned); |
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426 | st_insert(cm->dependenceTable, (char *)learned, (char *)cm->dependenceArray); |
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427 | } |
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428 | } |
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429 | cm->currentDecision = -1; |
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430 | return (-1); |
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431 | } |
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432 | |
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433 | d = SATgetDecision(cm->currentDecision); |
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434 | cm->implicatedSoFar -= d->implied->num; |
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435 | SATante(fdaLit) = 0; |
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436 | |
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437 | SATvalue(fdaLit) = inverted; |
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438 | SATmakeImplied(fdaLit, d); |
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439 | |
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440 | if((SATflags(fdaLit) & InQueueMask) == 0) { |
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441 | sat_Enqueue(cm->queue, fdaLit); |
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442 | SATflags(fdaLit) |= InQueueMask; |
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443 | } |
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444 | |
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445 | clauseArray->num = 0; |
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446 | |
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447 | if(option->incTraceObjective && objectFlag == 0) |
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448 | sat_ArrayInsert(cm->nonobjUnitLitArray, SATnot(fdaLit)); |
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449 | |
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450 | if(option->incDistill && objectFlag) |
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451 | sat_ArrayInsert(cm->objUnitLitArray, SATnot(fdaLit)); |
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452 | |
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453 | if(objectFlag) |
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454 | SATflags(fdaLit) |= ObjMask; |
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455 | |
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456 | /* Bing: UNSAT core generation */ |
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457 | if(cm->option->coreGeneration){ |
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458 | if(cm->option->RT){ |
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459 | st_insert(cm->anteTable,(char*)SATnormalNode(fdaLit),(char*)learned); |
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460 | |
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461 | st_insert(cm->RTreeTable, (char *)learned, (char *)rm->root); |
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462 | RT_oriClsIdx(rm->root) = learned; |
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463 | } |
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464 | else{ |
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465 | st_insert(cm->anteTable,(char*)SATnormalNode(fdaLit),(char*)learned); |
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466 | st_insert(cm->dependenceTable, (char *)learned, (char *)cm->dependenceArray); |
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467 | } |
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468 | } |
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469 | return(bLevel); |
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470 | } |
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471 | |
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472 | if(strongFlag && (SATnumConflict(conflicting) % 5) == 0 && |
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473 | clauseArray->num > 4) { |
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474 | nClauseArray = sat_ArrayAlloc(clauseArray->num); |
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475 | memcpy(nClauseArray->space, clauseArray->space, sizeof(long)*clauseArray->num); |
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476 | nClauseArray->num = clauseArray->num; |
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477 | clauseArray->num = 0; |
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478 | bLevel = sat_ConflictAnalysisUsingAuxImplication(cm, nClauseArray); |
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479 | sat_ArrayFree(nClauseArray); |
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480 | } |
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481 | else { |
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482 | /* add conflict learned clause */ |
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483 | learned = sat_AddConflictClause(cm, clauseArray, objectFlag); |
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484 | cm->currentTopConflict = cm->literals->last-1; |
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485 | cm->currentTopConflictCount = 0; |
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486 | |
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487 | /* Bing: UNSAT core generation */ |
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488 | if(cm->option->coreGeneration){ |
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489 | |
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490 | if(cm->option->RT){ |
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491 | st_insert(cm->RTreeTable, (char *)learned, (char *)rm->root); |
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492 | RT_oriClsIdx(rm->root) = learned; |
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493 | } |
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494 | else{ |
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495 | st_insert(cm->dependenceTable, (char *)learned, (char *)cm->dependenceArray); |
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496 | } |
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497 | } |
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498 | |
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499 | if(option->verbose > 2) { |
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500 | sat_PrintNode(cm, learned); |
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501 | fflush(cm->stdOut); |
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502 | } |
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503 | |
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504 | |
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505 | /* apply Deepest Variable Hike decision heuristic */ |
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506 | if(option->decisionHeuristic & DVH_DECISION) |
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507 | sat_UpdateDVH(cm, d, clauseArray, bLevel, fdaLit); |
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508 | |
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509 | /* Backtrack and failure driven assertion */ |
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510 | sat_Backtrack(cm, bLevel); |
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511 | |
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512 | d = SATgetDecision(bLevel); |
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513 | cm->implicatedSoFar -= d->implied->num; |
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514 | |
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515 | SATante(fdaLit) = learned; |
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516 | SATvalue(fdaLit) = inverted; |
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517 | SATmakeImplied(fdaLit, d); |
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518 | |
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519 | if((SATflags(fdaLit) & InQueueMask) == 0) { |
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520 | sat_Enqueue(cm->queue, fdaLit); |
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521 | SATflags(fdaLit) |= InQueueMask; |
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522 | } |
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523 | |
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524 | clauseArray->num = 0; |
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525 | if(objectFlag) |
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526 | SATflags(fdaLit) |= ObjMask; |
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527 | |
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528 | } |
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529 | |
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530 | return(bLevel); |
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531 | } |
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532 | |
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533 | /**Function******************************************************************** |
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534 | |
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535 | Synopsis [ Add conflict clause and backtrack.] |
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536 | |
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537 | Description [ Add conflict clause and backtrack.] |
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538 | |
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539 | SideEffects [] |
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540 | |
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541 | SeeAlso [] |
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542 | |
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543 | ******************************************************************************/ |
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544 | int |
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545 | sat_AddConflictClauseAndBacktrackForLifting( |
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546 | satManager_t *cm, |
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547 | satArray_t *clauseArray, |
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548 | satLevel_t *d, |
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549 | long fdaLit, |
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550 | int bLevel, |
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551 | int objectFlag, |
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552 | int strongFlag) |
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553 | { |
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554 | int inverted; |
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555 | long conflicting, learned; |
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556 | satOption_t *option; |
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557 | satStatistics_t *stats; |
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558 | satArray_t *nClauseArray; |
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559 | |
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560 | option = cm->option; |
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561 | stats = cm->each; |
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562 | |
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563 | inverted = SATisInverted(fdaLit); |
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564 | fdaLit = SATnormalNode(fdaLit); |
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565 | |
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566 | conflicting = d->conflict; |
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567 | |
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568 | if(option->verbose > 2) { |
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569 | if(option->verbose > 4) |
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570 | sat_PrintNode(cm, conflicting); |
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571 | fprintf(cm->stdOut, "conflict at %3d on %6ld bLevel %d UnitLit ", |
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572 | d->level, conflicting, bLevel); |
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573 | sat_PrintNodeAlone(cm, fdaLit); |
---|
574 | fprintf(cm->stdOut, "\n"); |
---|
575 | } |
---|
576 | |
---|
577 | d->conflict = 0; |
---|
578 | |
---|
579 | /* unit literal conflict clause */ |
---|
580 | if(clauseArray->num == 1) { |
---|
581 | learned = sat_AddUnitConflictClause(cm, clauseArray, objectFlag); |
---|
582 | stats->nUnitConflictCl++; |
---|
583 | cm->currentTopConflict = cm->literals->last-1; |
---|
584 | cm->currentTopConflictCount = 0; |
---|
585 | |
---|
586 | sat_Backtrack(cm, 0); |
---|
587 | |
---|
588 | if(SATlevel(fdaLit) == 0) { |
---|
589 | if(cm->option->coreGeneration){ |
---|
590 | st_insert(cm->anteTable,(char*)SATnormalNode(fdaLit),(char*)learned); |
---|
591 | st_insert(cm->dependenceTable, (char *)learned, (char *)cm->dependenceArray); |
---|
592 | } |
---|
593 | cm->currentDecision = -1; |
---|
594 | return (-1); |
---|
595 | } |
---|
596 | |
---|
597 | d = SATgetDecision(cm->currentDecision); |
---|
598 | cm->implicatedSoFar -= d->implied->num; |
---|
599 | SATante(fdaLit) = 0; |
---|
600 | |
---|
601 | SATvalue(fdaLit) = inverted; |
---|
602 | SATmakeImplied(fdaLit, d); |
---|
603 | |
---|
604 | if((SATflags(fdaLit) & InQueueMask) == 0) { |
---|
605 | sat_Enqueue(cm->queue, fdaLit); |
---|
606 | SATflags(fdaLit) |= InQueueMask; |
---|
607 | } |
---|
608 | |
---|
609 | clauseArray->num = 0; |
---|
610 | |
---|
611 | if(option->incTraceObjective && objectFlag == 0) |
---|
612 | sat_ArrayInsert(cm->nonobjUnitLitArray, SATnot(fdaLit)); |
---|
613 | |
---|
614 | if(option->incDistill && objectFlag) |
---|
615 | sat_ArrayInsert(cm->objUnitLitArray, SATnot(fdaLit)); |
---|
616 | |
---|
617 | if(objectFlag) |
---|
618 | SATflags(fdaLit) |= ObjMask; |
---|
619 | |
---|
620 | /* Bing: UNSAT core generation */ |
---|
621 | if(cm->option->coreGeneration){ |
---|
622 | st_insert(cm->anteTable,(char*)SATnormalNode(fdaLit),(char*)learned); |
---|
623 | st_insert(cm->dependenceTable, (char *)learned, (char *)cm->dependenceArray); |
---|
624 | } |
---|
625 | return(0); |
---|
626 | } |
---|
627 | |
---|
628 | if(strongFlag && (SATnumConflict(conflicting) % 5) == 0 && |
---|
629 | clauseArray->num > 4) { |
---|
630 | nClauseArray = sat_ArrayAlloc(clauseArray->num); |
---|
631 | memcpy(nClauseArray->space, clauseArray->space, sizeof(long)*clauseArray->num); |
---|
632 | nClauseArray->num = clauseArray->num; |
---|
633 | clauseArray->num = 0; |
---|
634 | bLevel = sat_ConflictAnalysisUsingAuxImplication(cm, nClauseArray); |
---|
635 | sat_ArrayFree(nClauseArray); |
---|
636 | } |
---|
637 | else { |
---|
638 | /* add conflict learned clause */ |
---|
639 | learned = sat_AddConflictClause(cm, clauseArray, objectFlag); |
---|
640 | cm->currentTopConflict = cm->literals->last-1; |
---|
641 | cm->currentTopConflictCount = 0; |
---|
642 | |
---|
643 | /* Bing: UNSAT core generation */ |
---|
644 | if(cm->option->coreGeneration){ |
---|
645 | st_insert(cm->dependenceTable, (char *)learned, (char *)cm->dependenceArray); |
---|
646 | } |
---|
647 | |
---|
648 | if(option->verbose > 2) { |
---|
649 | sat_PrintNode(cm, learned); |
---|
650 | fflush(cm->stdOut); |
---|
651 | } |
---|
652 | |
---|
653 | |
---|
654 | /* apply Deepest Variable Hike decision heuristic */ |
---|
655 | /** |
---|
656 | if(option->decisionHeuristic & DVH_DECISION) |
---|
657 | sat_UpdateDVH(cm, d, clauseArray, bLevel, fdaLit); |
---|
658 | **/ |
---|
659 | |
---|
660 | /* Backtrack and failure driven assertion */ |
---|
661 | sat_Backtrack(cm, bLevel); |
---|
662 | |
---|
663 | d = SATgetDecision(bLevel); |
---|
664 | cm->implicatedSoFar -= d->implied->num; |
---|
665 | |
---|
666 | SATante(fdaLit) = learned; |
---|
667 | SATvalue(fdaLit) = inverted; |
---|
668 | SATmakeImplied(fdaLit, d); |
---|
669 | |
---|
670 | if((SATflags(fdaLit) & InQueueMask) == 0) { |
---|
671 | sat_Enqueue(cm->queue, fdaLit); |
---|
672 | SATflags(fdaLit) |= InQueueMask; |
---|
673 | } |
---|
674 | |
---|
675 | clauseArray->num = 0; |
---|
676 | if(objectFlag) |
---|
677 | SATflags(fdaLit) |= ObjMask; |
---|
678 | |
---|
679 | } |
---|
680 | |
---|
681 | return(bLevel); |
---|
682 | } |
---|
683 | |
---|
684 | /**Function******************************************************************** |
---|
685 | |
---|
686 | Synopsis [ Add conflict clause with no score update and backtrack.] |
---|
687 | |
---|
688 | Description [ Add conflict clause with no score update and backtrack.] |
---|
689 | |
---|
690 | SideEffects [] |
---|
691 | |
---|
692 | SeeAlso [] |
---|
693 | |
---|
694 | ******************************************************************************/ |
---|
695 | int |
---|
696 | sat_AddConflictClauseWithNoScoreAndBacktrack( |
---|
697 | satManager_t *cm, |
---|
698 | satArray_t *clauseArray, |
---|
699 | satLevel_t *d, |
---|
700 | long fdaLit, |
---|
701 | int bLevel, |
---|
702 | int objectFlag, |
---|
703 | int strongFlag) |
---|
704 | { |
---|
705 | int inverted; |
---|
706 | long conflicting, learned; |
---|
707 | satOption_t *option; |
---|
708 | satStatistics_t *stats; |
---|
709 | satArray_t *nClauseArray; |
---|
710 | |
---|
711 | option = cm->option; |
---|
712 | stats = cm->each; |
---|
713 | |
---|
714 | inverted = SATisInverted(fdaLit); |
---|
715 | fdaLit = SATnormalNode(fdaLit); |
---|
716 | |
---|
717 | conflicting = d->conflict; |
---|
718 | |
---|
719 | if(option->verbose > 2) { |
---|
720 | if(option->verbose > 4) |
---|
721 | sat_PrintNode(cm, conflicting); |
---|
722 | fprintf(cm->stdOut, "conflict at %3d on %6ld bLevel %d UnitLit ", |
---|
723 | d->level, conflicting, bLevel); |
---|
724 | sat_PrintNodeAlone(cm, fdaLit); |
---|
725 | fprintf(cm->stdOut, "\n"); |
---|
726 | } |
---|
727 | |
---|
728 | d->conflict = 0; |
---|
729 | |
---|
730 | /* unit literal conflict clause */ |
---|
731 | if(clauseArray->num == 1) { |
---|
732 | learned = sat_AddUnitConflictClause(cm, clauseArray, objectFlag); |
---|
733 | stats->nUnitConflictCl++; |
---|
734 | cm->currentTopConflict = cm->literals->last-1; |
---|
735 | cm->currentTopConflictCount = 0; |
---|
736 | |
---|
737 | sat_Backtrack(cm, 0); |
---|
738 | |
---|
739 | if(SATlevel(fdaLit) == 0) { |
---|
740 | if(cm->option->coreGeneration){ |
---|
741 | st_insert(cm->anteTable,(char*)SATnormalNode(fdaLit),(char*)learned); |
---|
742 | st_insert(cm->dependenceTable, (char *)learned, (char *)cm->dependenceArray); |
---|
743 | } |
---|
744 | cm->currentDecision = -1; |
---|
745 | return (-1); |
---|
746 | } |
---|
747 | |
---|
748 | d = SATgetDecision(cm->currentDecision); |
---|
749 | cm->implicatedSoFar -= d->implied->num; |
---|
750 | SATante(fdaLit) = 0; |
---|
751 | |
---|
752 | SATvalue(fdaLit) = inverted; |
---|
753 | SATmakeImplied(fdaLit, d); |
---|
754 | |
---|
755 | if((SATflags(fdaLit) & InQueueMask) == 0) { |
---|
756 | sat_Enqueue(cm->queue, fdaLit); |
---|
757 | SATflags(fdaLit) |= InQueueMask; |
---|
758 | } |
---|
759 | |
---|
760 | clauseArray->num = 0; |
---|
761 | |
---|
762 | if(option->incTraceObjective && objectFlag == 0) |
---|
763 | sat_ArrayInsert(cm->nonobjUnitLitArray, SATnot(fdaLit)); |
---|
764 | |
---|
765 | if(option->incDistill && objectFlag) |
---|
766 | sat_ArrayInsert(cm->objUnitLitArray, SATnot(fdaLit)); |
---|
767 | |
---|
768 | if(objectFlag) |
---|
769 | SATflags(fdaLit) |= ObjMask; |
---|
770 | |
---|
771 | /* Bing: UNSAT core generation */ |
---|
772 | if(cm->option->coreGeneration){ |
---|
773 | st_insert(cm->anteTable,(char*)SATnormalNode(fdaLit),(char*)learned); |
---|
774 | st_insert(cm->dependenceTable, (char *)learned, (char *)cm->dependenceArray); |
---|
775 | } |
---|
776 | return(bLevel); |
---|
777 | } |
---|
778 | |
---|
779 | if(strongFlag && (SATnumConflict(conflicting) % 5) == 0 && |
---|
780 | clauseArray->num > 4) { |
---|
781 | nClauseArray = sat_ArrayAlloc(clauseArray->num); |
---|
782 | memcpy(nClauseArray->space, clauseArray->space, sizeof(long)*clauseArray->num); |
---|
783 | nClauseArray->num = clauseArray->num; |
---|
784 | clauseArray->num = 0; |
---|
785 | bLevel = sat_ConflictAnalysisUsingAuxImplication(cm, nClauseArray); |
---|
786 | sat_ArrayFree(nClauseArray); |
---|
787 | } |
---|
788 | else { |
---|
789 | /* add conflict learned clause */ |
---|
790 | learned = sat_AddConflictClauseNoScoreUpdate(cm, clauseArray, objectFlag); |
---|
791 | cm->currentTopConflict = cm->literals->last-1; |
---|
792 | cm->currentTopConflictCount = 0; |
---|
793 | |
---|
794 | /* Bing: UNSAT core generation */ |
---|
795 | if(cm->option->coreGeneration){ |
---|
796 | st_insert(cm->dependenceTable, (char *)learned, (char *)cm->dependenceArray); |
---|
797 | } |
---|
798 | |
---|
799 | if(option->verbose > 2) { |
---|
800 | sat_PrintNode(cm, learned); |
---|
801 | fflush(cm->stdOut); |
---|
802 | } |
---|
803 | |
---|
804 | |
---|
805 | /* apply Deepest Variable Hike decision heuristic */ |
---|
806 | if(option->decisionHeuristic & DVH_DECISION) |
---|
807 | sat_UpdateDVH(cm, d, clauseArray, bLevel, fdaLit); |
---|
808 | |
---|
809 | /* Backtrack and failure driven assertion */ |
---|
810 | sat_Backtrack(cm, bLevel); |
---|
811 | |
---|
812 | d = SATgetDecision(bLevel); |
---|
813 | cm->implicatedSoFar -= d->implied->num; |
---|
814 | |
---|
815 | SATante(fdaLit) = learned; |
---|
816 | SATvalue(fdaLit) = inverted; |
---|
817 | SATmakeImplied(fdaLit, d); |
---|
818 | |
---|
819 | if((SATflags(fdaLit) & InQueueMask) == 0) { |
---|
820 | sat_Enqueue(cm->queue, fdaLit); |
---|
821 | SATflags(fdaLit) |= InQueueMask; |
---|
822 | } |
---|
823 | |
---|
824 | clauseArray->num = 0; |
---|
825 | if(objectFlag) |
---|
826 | SATflags(fdaLit) |= ObjMask; |
---|
827 | |
---|
828 | } |
---|
829 | |
---|
830 | return(bLevel); |
---|
831 | } |
---|
832 | |
---|
833 | /**Function******************************************************************** |
---|
834 | |
---|
835 | Synopsis [ Minimize conflict clause by rebuilding implication graph.] |
---|
836 | |
---|
837 | Description [ Minimize conflict clause by rebuilding implication graph.] |
---|
838 | |
---|
839 | SideEffects [] |
---|
840 | |
---|
841 | SeeAlso [] |
---|
842 | |
---|
843 | ******************************************************************************/ |
---|
844 | int |
---|
845 | sat_ConflictAnalysisUsingAuxImplication( |
---|
846 | satManager_t *cm, |
---|
847 | satArray_t *clauseArray) |
---|
848 | { |
---|
849 | int tLevel, level, bLevel; |
---|
850 | int i, size; |
---|
851 | int value, tvalue; |
---|
852 | int minConflict, maxConflict; |
---|
853 | long v, tv, conflicting; |
---|
854 | satLevel_t *d; |
---|
855 | satArray_t *nClauseArray; |
---|
856 | double aMean, hMean, gMean; |
---|
857 | int objectFlag; |
---|
858 | long fdaLit; |
---|
859 | |
---|
860 | SATcm = cm; |
---|
861 | qsort(clauseArray->space, clauseArray->num, sizeof(int), levelCompare); |
---|
862 | tLevel = cm->currentDecision; |
---|
863 | |
---|
864 | tv = clauseArray->space[0]; |
---|
865 | v = SATnormalNode(tv); |
---|
866 | level = SATlevel(v); |
---|
867 | minConflict = cm->decisionHead[level].nConflict; |
---|
868 | tv = clauseArray->space[clauseArray->num-1]; |
---|
869 | v = SATnormalNode(tv); |
---|
870 | level = SATlevel(v); |
---|
871 | maxConflict = cm->decisionHead[level].nConflict; |
---|
872 | |
---|
873 | aMean = hMean = 0; |
---|
874 | |
---|
875 | for(i=0; i<clauseArray->num; i++) { |
---|
876 | tv = clauseArray->space[i]; |
---|
877 | v = SATnormalNode(tv); |
---|
878 | level = SATlevel(v); |
---|
879 | if(level < tLevel) tLevel = level; |
---|
880 | aMean = aMean + (double)level; |
---|
881 | hMean = hMean + 1.0/(double)level; |
---|
882 | } |
---|
883 | aMean = aMean/(double)clauseArray->num; |
---|
884 | hMean = (double)clauseArray->num/hMean; |
---|
885 | gMean = sqrt(aMean*hMean); |
---|
886 | |
---|
887 | sat_Backtrack(cm, tLevel-1); |
---|
888 | |
---|
889 | size = clauseArray->num; |
---|
890 | |
---|
891 | for(i=0; i<size; i++) { |
---|
892 | tv = clauseArray->space[i]; |
---|
893 | value = !SATisInverted(tv); |
---|
894 | v = SATnormalNode(tv); |
---|
895 | tvalue = SATvalue(v); |
---|
896 | |
---|
897 | if(tvalue != 2) { |
---|
898 | /** |
---|
899 | if(tvalue != value) { |
---|
900 | fprintf(stdout, "ERROR : Inconsitent value is implied\n"); |
---|
901 | sat_ReportStatistics(cm, cm->each); |
---|
902 | } |
---|
903 | **/ |
---|
904 | continue; |
---|
905 | } |
---|
906 | d = sat_AllocLevel(cm); |
---|
907 | |
---|
908 | SATvalue(v) = value; |
---|
909 | SATmakeImplied(v, d); |
---|
910 | d->decisionNode = v; |
---|
911 | d->nConflict = cm->each->nConflictCl; |
---|
912 | if((SATflags(v) & InQueueMask) == 0) { |
---|
913 | sat_Enqueue(cm->queue, v); |
---|
914 | SATflags(v) |= InQueueMask; |
---|
915 | } |
---|
916 | sat_ImplicationMain(cm, d); |
---|
917 | |
---|
918 | if(d->conflict) { |
---|
919 | conflicting = d->conflict; |
---|
920 | break; |
---|
921 | } |
---|
922 | } |
---|
923 | |
---|
924 | if(d->conflict) { |
---|
925 | nClauseArray = cm->auxArray; |
---|
926 | bLevel = 0; |
---|
927 | fdaLit = -1; |
---|
928 | nClauseArray->num = 0; |
---|
929 | sat_FindUIP(cm, nClauseArray, d, &objectFlag, &bLevel, &fdaLit); |
---|
930 | |
---|
931 | /** |
---|
932 | fprintf(stdout, "tLevel %d gLevel %.1lf %ld -> %ld min %d max %d\n", |
---|
933 | tLevel, gMean, clauseArray->num, nClauseArray->num, |
---|
934 | minConflict, maxConflict); |
---|
935 | **/ |
---|
936 | |
---|
937 | bLevel = sat_AddConflictClauseAndBacktrack( |
---|
938 | cm, nClauseArray, d, fdaLit, bLevel, objectFlag, 0); |
---|
939 | |
---|
940 | |
---|
941 | } |
---|
942 | else { |
---|
943 | bLevel = cm->currentDecision; |
---|
944 | } |
---|
945 | return(bLevel); |
---|
946 | |
---|
947 | } |
---|
948 | |
---|
949 | |
---|
950 | /**Function******************************************************************** |
---|
951 | |
---|
952 | Synopsis [ Conflict Analysis that is used for UNSAT core generation.] |
---|
953 | |
---|
954 | Description [ Conflict Analysis that is used for UNSAT core generation.] |
---|
955 | |
---|
956 | SideEffects [] |
---|
957 | |
---|
958 | SeeAlso [] |
---|
959 | |
---|
960 | ******************************************************************************/ |
---|
961 | int |
---|
962 | sat_ConflictAnalysisForCoreGen( |
---|
963 | satManager_t *cm, |
---|
964 | satLevel_t *d) |
---|
965 | { |
---|
966 | satStatistics_t *stats; |
---|
967 | satOption_t *option; |
---|
968 | satArray_t *clauseArray; |
---|
969 | int objectFlag; |
---|
970 | int bLevel; |
---|
971 | long fdaLit, learned, conflicting; |
---|
972 | int inverted; |
---|
973 | |
---|
974 | RTManager_t * rm = cm->rm; |
---|
975 | |
---|
976 | if(d->level != 0) { |
---|
977 | fprintf(stdout, "ERROR : Can't use this function at higher than level 0\n"); |
---|
978 | return(0); |
---|
979 | } |
---|
980 | |
---|
981 | conflicting = d->conflict; |
---|
982 | |
---|
983 | stats = cm->each; |
---|
984 | option = cm->option; |
---|
985 | |
---|
986 | stats->nBacktracks++; |
---|
987 | |
---|
988 | clauseArray = cm->auxArray; |
---|
989 | |
---|
990 | bLevel = 0; |
---|
991 | fdaLit = -1; |
---|
992 | clauseArray->num = 0; |
---|
993 | |
---|
994 | /* Find Unique Implication Point */ |
---|
995 | |
---|
996 | if(option->RT) |
---|
997 | sat_FindUIPForCoreGenWithRT(cm, clauseArray, d, &objectFlag, &bLevel,&fdaLit); |
---|
998 | else |
---|
999 | sat_FindUIPForCoreGen(cm, clauseArray, d, &objectFlag, &bLevel, &fdaLit); |
---|
1000 | |
---|
1001 | if(fdaLit < 0 ) |
---|
1002 | fprintf(stdout, "ERROR : critical\n"); |
---|
1003 | |
---|
1004 | inverted = SATisInverted(fdaLit); |
---|
1005 | fdaLit = SATnormalNode(fdaLit); |
---|
1006 | |
---|
1007 | d->conflict = 0; |
---|
1008 | |
---|
1009 | assert(clauseArray->num == 1); |
---|
1010 | learned = sat_AddUnitConflictClause(cm, clauseArray, objectFlag); |
---|
1011 | |
---|
1012 | SATante(fdaLit) = 0; |
---|
1013 | |
---|
1014 | clauseArray->num = 0; |
---|
1015 | |
---|
1016 | /* Bing: UNSAT core generation */ |
---|
1017 | if(cm->option->coreGeneration){ |
---|
1018 | st_insert(cm->anteTable,(char*)(long)SATnormalNode(fdaLit),(char*)(long)learned); |
---|
1019 | if(option->RT){ |
---|
1020 | st_insert(cm->RTreeTable, (char *)learned, (char *)rm->root); |
---|
1021 | RT_oriClsIdx(rm->root) = learned; |
---|
1022 | } |
---|
1023 | else |
---|
1024 | st_insert(cm->dependenceTable, (char *)(long)learned, (char *)(long)cm->dependenceArray); |
---|
1025 | } |
---|
1026 | return 1; |
---|
1027 | } |
---|
1028 | |
---|
1029 | /**Function******************************************************************** |
---|
1030 | |
---|
1031 | Synopsis [ Find Unique implication point] |
---|
1032 | |
---|
1033 | Description [ After finding unique implication point, the backtrack level |
---|
1034 | and failure driven assertion are identified. ] |
---|
1035 | |
---|
1036 | SideEffects [] |
---|
1037 | |
---|
1038 | SeeAlso [] |
---|
1039 | |
---|
1040 | ******************************************************************************/ |
---|
1041 | void |
---|
1042 | sat_FindUIP( |
---|
1043 | satManager_t *cm, |
---|
1044 | satArray_t *clauseArray, |
---|
1045 | satLevel_t *d, |
---|
1046 | int *objectFlag, |
---|
1047 | int *bLevel, |
---|
1048 | long *fdaLit) |
---|
1049 | { |
---|
1050 | long conflicting; |
---|
1051 | int nMarked, value; |
---|
1052 | int first, i; |
---|
1053 | long *space, v; |
---|
1054 | satArray_t *implied; |
---|
1055 | satOption_t *option; |
---|
1056 | |
---|
1057 | conflicting = d->conflict; |
---|
1058 | nMarked = 0; |
---|
1059 | option = cm->option; |
---|
1060 | if(option->incTraceObjective) *objectFlag = 0; |
---|
1061 | else *objectFlag = ObjMask; |
---|
1062 | |
---|
1063 | (*objectFlag) |= (SATflags(conflicting) & ObjMask); |
---|
1064 | |
---|
1065 | /* find seed from conflicting clause to find unique implication point. |
---|
1066 | * */ |
---|
1067 | clauseArray->num = 0; |
---|
1068 | |
---|
1069 | if(SATflags(conflicting) & IsCNFMask) |
---|
1070 | SATconflictUsage(conflicting)++; |
---|
1071 | |
---|
1072 | sat_MarkNodeInConflict( |
---|
1073 | cm, d, &nMarked, objectFlag, bLevel, clauseArray); |
---|
1074 | |
---|
1075 | /* Traverse implication graph backward */ |
---|
1076 | first = 1; |
---|
1077 | implied = d->implied; |
---|
1078 | space = implied->space+implied->num-1; |
---|
1079 | /* Bing: UNSAT core generation */ |
---|
1080 | if(cm->option->coreGeneration){ |
---|
1081 | cm->dependenceArray = sat_ArrayAlloc(1); |
---|
1082 | sat_ArrayInsert(cm->dependenceArray,conflicting); |
---|
1083 | } |
---|
1084 | |
---|
1085 | for(i=implied->num-1; i>=0; i--, space--) { |
---|
1086 | v = *space; |
---|
1087 | if(SATflags(v) & VisitedMask) { |
---|
1088 | SATflags(v) &= ResetVisitedMask; |
---|
1089 | --nMarked; |
---|
1090 | |
---|
1091 | if(nMarked == 0 && (!first || i==0)) { |
---|
1092 | value = SATvalue(v); |
---|
1093 | *fdaLit = v^(!value); |
---|
1094 | sat_ArrayInsert(clauseArray, *fdaLit); |
---|
1095 | break; |
---|
1096 | } |
---|
1097 | |
---|
1098 | /* Bing: UNSAT core genration */ |
---|
1099 | if(cm->option->coreGeneration){ |
---|
1100 | int ante = SATante(v); |
---|
1101 | if(ante!=0 && !(SATflags(ante) & IsCNFMask)){ |
---|
1102 | printf("node %d is not CNF\n", ante); |
---|
1103 | exit(0); |
---|
1104 | } |
---|
1105 | if(ante==0){ |
---|
1106 | if(!st_lookup(cm->anteTable, (char *)SATnormalNode(v), &ante)){ |
---|
1107 | printf("ante = 0 and is not in anteTable %ld\n",v); |
---|
1108 | exit(0); |
---|
1109 | } |
---|
1110 | } |
---|
1111 | sat_ArrayInsert(cm->dependenceArray,ante); |
---|
1112 | } |
---|
1113 | |
---|
1114 | sat_MarkNodeInImpliedNode( |
---|
1115 | cm, d, v, &nMarked, objectFlag, bLevel, clauseArray); |
---|
1116 | } |
---|
1117 | first = 0; |
---|
1118 | } |
---|
1119 | |
---|
1120 | |
---|
1121 | /* Minimize conflict clause */ |
---|
1122 | if(option->minimizeConflictClause) |
---|
1123 | sat_MinimizeConflictClause(cm, clauseArray); |
---|
1124 | else |
---|
1125 | sat_ResetFlagForClauseArray(cm, clauseArray); |
---|
1126 | |
---|
1127 | return; |
---|
1128 | } |
---|
1129 | /**Function******************************************************************** |
---|
1130 | |
---|
1131 | Synopsis [find UIP with resolution generation] |
---|
1132 | |
---|
1133 | Description [] |
---|
1134 | |
---|
1135 | SideEffects [] |
---|
1136 | |
---|
1137 | SeeAlso [] |
---|
1138 | |
---|
1139 | ******************************************************************************/ |
---|
1140 | |
---|
1141 | |
---|
1142 | void |
---|
1143 | sat_FindUIPWithRT( |
---|
1144 | satManager_t *cm, |
---|
1145 | satArray_t *clauseArray, |
---|
1146 | satLevel_t *d, |
---|
1147 | int *objectFlag, |
---|
1148 | int *bLevel, |
---|
1149 | long *fdaLit) |
---|
1150 | { |
---|
1151 | long conflicting; |
---|
1152 | int nMarked, value; |
---|
1153 | int first, i,j; |
---|
1154 | long *space, v,left,right,inverted,result,*tmp; |
---|
1155 | satArray_t *implied; |
---|
1156 | satOption_t *option; |
---|
1157 | RTnode_t tmprt; |
---|
1158 | int size = 0; |
---|
1159 | long *lp,*tmpIP,ante,ante2,node; |
---|
1160 | RTManager_t * rm = cm->rm; |
---|
1161 | |
---|
1162 | conflicting = d->conflict; |
---|
1163 | nMarked = 0; |
---|
1164 | option = cm->option; |
---|
1165 | if(option->incTraceObjective) *objectFlag = 0; |
---|
1166 | else *objectFlag = ObjMask; |
---|
1167 | |
---|
1168 | (*objectFlag) |= (SATflags(conflicting) & ObjMask); |
---|
1169 | |
---|
1170 | /* find seed from conflicting clause to find unique implication point. |
---|
1171 | * */ |
---|
1172 | clauseArray->num = 0; |
---|
1173 | sat_MarkNodeInConflict( |
---|
1174 | cm, d, &nMarked, objectFlag, bLevel, clauseArray); |
---|
1175 | |
---|
1176 | /* Traverse implication graph backward */ |
---|
1177 | first = 1; |
---|
1178 | implied = d->implied; |
---|
1179 | space = implied->space+implied->num-1; |
---|
1180 | |
---|
1181 | |
---|
1182 | if(cm->option->coreGeneration){ |
---|
1183 | /*if last conflict is CNF*/ |
---|
1184 | if(SATflags(conflicting)&IsCNFMask){ |
---|
1185 | /*is conflict CNF*/ |
---|
1186 | if(SATflags(conflicting)&IsConflictMask){ |
---|
1187 | if(!st_lookup(cm->RTreeTable,(char*)conflicting,&tmprt)){ |
---|
1188 | printf("RTree node of conflict cnf %ld is not in RTreeTable\n",ante); |
---|
1189 | exit(0); |
---|
1190 | } |
---|
1191 | else{ |
---|
1192 | rm->root = tmprt; |
---|
1193 | #if PR |
---|
1194 | printf("Get formula for CONFLICT CLAUSE:%d\n",ante); |
---|
1195 | #endif |
---|
1196 | } |
---|
1197 | } |
---|
1198 | /*CNF but not conflict*/ |
---|
1199 | else{ |
---|
1200 | rm->root = RTCreateNode(rm); |
---|
1201 | |
---|
1202 | size = SATnumLits(conflicting); |
---|
1203 | RT_fSize(rm->root) = size; |
---|
1204 | lp = (long*)SATfirstLit(conflicting); |
---|
1205 | sat_BuildRT(cm,rm->root, lp, tmpIP,size,0); |
---|
1206 | } |
---|
1207 | } |
---|
1208 | /*if last conflict is AIG*/ |
---|
1209 | else{ |
---|
1210 | rm->root = RTCreateNode(rm); |
---|
1211 | node = SATnormalNode(conflicting); |
---|
1212 | left = SATleftChild(node); |
---|
1213 | right = SATrightChild(node); |
---|
1214 | result = PureSat_IdentifyConflict(cm,left,right,conflicting); |
---|
1215 | inverted = SATisInverted(left); |
---|
1216 | left = SATnormalNode(left); |
---|
1217 | left = inverted ? SATnot(left) : left; |
---|
1218 | |
---|
1219 | inverted = SATisInverted(right); |
---|
1220 | right = SATnormalNode(right); |
---|
1221 | right = inverted ? SATnot(right) : right; |
---|
1222 | |
---|
1223 | j = node; |
---|
1224 | |
---|
1225 | if(result == 1){ |
---|
1226 | tmp = ALLOC(long,3); |
---|
1227 | tmp[0] = left; |
---|
1228 | tmp[1] = SATnot(j); |
---|
1229 | size = 2; |
---|
1230 | } |
---|
1231 | else if(result == 2){ |
---|
1232 | tmp = ALLOC(long,3); |
---|
1233 | tmp[0] = right; |
---|
1234 | tmp[1] = SATnot(j); |
---|
1235 | size = 2; |
---|
1236 | } |
---|
1237 | else if(result == 3){ |
---|
1238 | tmp = ALLOC(long,4); |
---|
1239 | tmp[0] = SATnot(left); |
---|
1240 | tmp[1] = SATnot(right); |
---|
1241 | tmp[2] = j; |
---|
1242 | size = 3; |
---|
1243 | } |
---|
1244 | else{ |
---|
1245 | printf("wrong returned result value, exit\n"); |
---|
1246 | exit(0); |
---|
1247 | } |
---|
1248 | |
---|
1249 | lp = tmp; |
---|
1250 | sat_BuildRT(cm,rm->root, lp, tmpIP,size,1); |
---|
1251 | FREE(tmp); |
---|
1252 | } |
---|
1253 | } |
---|
1254 | |
---|
1255 | |
---|
1256 | for(i=implied->num-1; i>=0; i--, space--) { |
---|
1257 | v = *space; |
---|
1258 | if(SATflags(v) & VisitedMask) { |
---|
1259 | SATflags(v) &= ResetVisitedMask; |
---|
1260 | --nMarked; |
---|
1261 | |
---|
1262 | if(nMarked == 0 && (!first || i==0)) { |
---|
1263 | value = SATvalue(v); |
---|
1264 | *fdaLit = v^(!value); |
---|
1265 | sat_ArrayInsert(clauseArray, *fdaLit); |
---|
1266 | break; |
---|
1267 | } |
---|
1268 | |
---|
1269 | |
---|
1270 | if(cm->option->coreGeneration){ |
---|
1271 | ante = SATante(v); |
---|
1272 | if(ante==0){ |
---|
1273 | if(!(st_lookup(cm->anteTable, (char *)SATnormalNode(v),&ante))){ |
---|
1274 | printf("ante = 0 and is not in anteTable %ld\n",v); |
---|
1275 | exit(0); |
---|
1276 | } |
---|
1277 | } |
---|
1278 | |
---|
1279 | /*build non-leaf node*/ |
---|
1280 | tmprt = RTCreateNode(rm); |
---|
1281 | RT_pivot(tmprt) = SATnormalNode(v); |
---|
1282 | RT_right(tmprt) = rm->root; |
---|
1283 | rm->root = tmprt; |
---|
1284 | |
---|
1285 | if((SATflags(ante)&IsConflictMask)&&(SATflags(ante)&IsCNFMask)){ |
---|
1286 | if(!st_lookup(cm->RTreeTable,(char*)ante,&tmprt)){ |
---|
1287 | printf("RTree node of conflict cnf %ld is not in RTreeTable\n",ante); |
---|
1288 | exit(0); |
---|
1289 | } |
---|
1290 | else{ |
---|
1291 | RT_left(rm->root) = tmprt; |
---|
1292 | #if PR |
---|
1293 | printf("Get formula for CONFLICT CLAUSE:%d\n",ante); |
---|
1294 | #endif |
---|
1295 | } |
---|
1296 | } |
---|
1297 | else{ /* if not conflict CNF*/ |
---|
1298 | /*left */ |
---|
1299 | tmprt = RTCreateNode(rm); |
---|
1300 | RT_left(rm->root) = tmprt; |
---|
1301 | /*left is AIG*/ |
---|
1302 | if(!(SATflags(ante) & IsCNFMask)){ |
---|
1303 | /*generate formula for left*/ |
---|
1304 | tmp = ALLOC(long,3); |
---|
1305 | value = SATvalue(v); |
---|
1306 | node = SATnormalNode(v); |
---|
1307 | node = value==1?node:SATnot(node); |
---|
1308 | tmp[0] = node; |
---|
1309 | |
---|
1310 | size = 1; |
---|
1311 | if(ante != SATnormalNode(v)){ |
---|
1312 | value = SATvalue(ante); |
---|
1313 | node = SATnormalNode(ante); |
---|
1314 | node = value==1?SATnot(node):node; |
---|
1315 | tmp[1] = node; |
---|
1316 | size++; |
---|
1317 | ante2 = SATante2(v); |
---|
1318 | if(ante2){ |
---|
1319 | value = SATvalue(ante2); |
---|
1320 | node = SATnormalNode(ante2); |
---|
1321 | node = value==1?SATnot(node):node; |
---|
1322 | tmp[2] = node; |
---|
1323 | size++; |
---|
1324 | } |
---|
1325 | } |
---|
1326 | |
---|
1327 | lp = tmp; |
---|
1328 | sat_BuildRT(cm,tmprt,lp,tmpIP,size,1); |
---|
1329 | FREE(tmp); |
---|
1330 | } |
---|
1331 | /* left is CNF*/ |
---|
1332 | else{ |
---|
1333 | |
---|
1334 | lp = (long*)SATfirstLit(ante); |
---|
1335 | size = SATnumLits(ante); |
---|
1336 | RT_fSize(tmprt) = size; |
---|
1337 | sat_BuildRT(cm,tmprt, lp, tmpIP,size,0); |
---|
1338 | } |
---|
1339 | } /*else{ // if not conflict CNF*/ |
---|
1340 | |
---|
1341 | }/*if(cm->option->coreGeneration){*/ |
---|
1342 | |
---|
1343 | |
---|
1344 | sat_MarkNodeInImpliedNode( |
---|
1345 | cm, d, v, &nMarked, objectFlag, bLevel, clauseArray); |
---|
1346 | } |
---|
1347 | first = 0; |
---|
1348 | } |
---|
1349 | |
---|
1350 | |
---|
1351 | /* Minimize conflict clause */ |
---|
1352 | if(option->minimizeConflictClause) |
---|
1353 | sat_MinimizeConflictClause(cm, clauseArray); |
---|
1354 | else |
---|
1355 | sat_ResetFlagForClauseArray(cm, clauseArray); |
---|
1356 | |
---|
1357 | return; |
---|
1358 | } |
---|
1359 | |
---|
1360 | /**Function******************************************************************** |
---|
1361 | |
---|
1362 | Synopsis [ Find Unique implication point and find cut to generate additional conflict clause] |
---|
1363 | |
---|
1364 | Description [ After finding unique implication point, the backtrack level |
---|
1365 | and failure driven assertion are identified. ] |
---|
1366 | |
---|
1367 | SideEffects [] |
---|
1368 | |
---|
1369 | SeeAlso [] |
---|
1370 | |
---|
1371 | ******************************************************************************/ |
---|
1372 | void |
---|
1373 | sat_FindUIPAndNonUIP( |
---|
1374 | satManager_t *cm, |
---|
1375 | satArray_t *clauseArray, |
---|
1376 | satLevel_t *d, |
---|
1377 | int *objectFlag, |
---|
1378 | int *bLevel, |
---|
1379 | long *fdaLit) |
---|
1380 | { |
---|
1381 | long conflicting; |
---|
1382 | int nMarked, value; |
---|
1383 | int first, i, j; |
---|
1384 | int size, oSize; |
---|
1385 | int depth, maxSize; |
---|
1386 | long *space, v, nv, maxV; |
---|
1387 | long ante, ante2; |
---|
1388 | long learned; |
---|
1389 | long *plit; |
---|
1390 | satArray_t *implied; |
---|
1391 | satArray_t *nClauseArray; |
---|
1392 | satOption_t *option; |
---|
1393 | int tLevel, inverted, lBacktrace, uBacktrace; |
---|
1394 | int minLimit, markLimit, tObjectFlag; |
---|
1395 | int inserted; |
---|
1396 | long tFdaLit; |
---|
1397 | |
---|
1398 | /** HSJIN : Need to be update to make it consider UNSAT core generation **/ |
---|
1399 | conflicting = d->conflict; |
---|
1400 | nMarked = 0; |
---|
1401 | option = cm->option; |
---|
1402 | if(option->incTraceObjective) *objectFlag = 0; |
---|
1403 | else *objectFlag = ObjMask; |
---|
1404 | |
---|
1405 | (*objectFlag) |= (SATflags(conflicting) & ObjMask); |
---|
1406 | |
---|
1407 | /* find seed from conflicting clause to find unique implication point. |
---|
1408 | * */ |
---|
1409 | clauseArray->num = 0; |
---|
1410 | |
---|
1411 | if(SATflags(conflicting) & IsCNFMask) |
---|
1412 | SATconflictUsage(conflicting)++; |
---|
1413 | |
---|
1414 | sat_MarkNodeInConflict( |
---|
1415 | cm, d, &nMarked, objectFlag, bLevel, clauseArray); |
---|
1416 | |
---|
1417 | /* Traverse implication graph backward */ |
---|
1418 | first = 1; |
---|
1419 | implied = d->implied; |
---|
1420 | space = implied->space+implied->num-1; |
---|
1421 | maxSize = 0; |
---|
1422 | maxV = 0; |
---|
1423 | /* Bing: UNSAT core generation */ |
---|
1424 | if(cm->option->coreGeneration){ |
---|
1425 | cm->dependenceArray = sat_ArrayAlloc(1); |
---|
1426 | sat_ArrayInsert(cm->dependenceArray,conflicting); |
---|
1427 | } |
---|
1428 | |
---|
1429 | for(i=implied->num-1; i>=0; i--, space--) { |
---|
1430 | v = *space; |
---|
1431 | if(SATflags(v) & VisitedMask) { |
---|
1432 | SATflags(v) &= ResetVisitedMask; |
---|
1433 | --nMarked; |
---|
1434 | |
---|
1435 | depth = cm->variableArray[SATnodeID(v)].depth; |
---|
1436 | if(nMarked == 0 && (!first || i==0)) { |
---|
1437 | value = SATvalue(v); |
---|
1438 | *fdaLit = v^(!value); |
---|
1439 | sat_ArrayInsert(clauseArray, *fdaLit); |
---|
1440 | break; |
---|
1441 | } |
---|
1442 | |
---|
1443 | ante = SATante(v); |
---|
1444 | /* Bing: UNSAT core genration */ |
---|
1445 | if(cm->option->coreGeneration){ |
---|
1446 | if(ante!=0 && !(SATflags(ante) & IsCNFMask)){ |
---|
1447 | printf("node %ld is not CNF\n", ante); |
---|
1448 | exit(0); |
---|
1449 | } |
---|
1450 | if(ante==0){ |
---|
1451 | if(!st_lookup(cm->anteTable, (char *)SATnormalNode(v), &ante)){ |
---|
1452 | printf("ante = 0 and is not in anteTable %ld\n",v); |
---|
1453 | exit(0); |
---|
1454 | } |
---|
1455 | } |
---|
1456 | sat_ArrayInsert(cm->dependenceArray,ante); |
---|
1457 | } |
---|
1458 | |
---|
1459 | /** |
---|
1460 | sat_MarkNodeInImpliedNode( |
---|
1461 | cm, d, v, &nMarked, objectFlag, bLevel, clauseArray); |
---|
1462 | **/ |
---|
1463 | |
---|
1464 | if(SATflags(ante) & IsCNFMask) { |
---|
1465 | SATconflictUsage(ante)++; |
---|
1466 | size = SATnumLits(ante); |
---|
1467 | oSize = clauseArray->num; |
---|
1468 | for(j=0, plit=(long*)SATfirstLit(ante); j<size; j++, plit++) { |
---|
1469 | nv = SATgetNode(*plit); |
---|
1470 | if(SATnormalNode(nv) != v) { |
---|
1471 | sat_MarkNodeSub(cm, nv, &nMarked, bLevel, d, clauseArray); |
---|
1472 | if(cm->variableArray[SATnodeID(nv)].depth <= depth) { |
---|
1473 | cm->variableArray[SATnodeID(nv)].depth = depth+1; |
---|
1474 | } |
---|
1475 | } |
---|
1476 | } |
---|
1477 | oSize = clauseArray->num-oSize; |
---|
1478 | if(oSize > maxSize) { |
---|
1479 | maxSize = oSize; |
---|
1480 | maxV = v; |
---|
1481 | } |
---|
1482 | } |
---|
1483 | else { |
---|
1484 | sat_MarkNodeSub(cm, ante, &nMarked, bLevel, d, clauseArray); |
---|
1485 | ante2 = SATante2(v); |
---|
1486 | if(ante2) |
---|
1487 | sat_MarkNodeSub(cm, ante2, &nMarked, bLevel, d, clauseArray); |
---|
1488 | } |
---|
1489 | |
---|
1490 | } |
---|
1491 | first = 0; |
---|
1492 | } |
---|
1493 | |
---|
1494 | /* Minimize conflict clause */ |
---|
1495 | if(option->minimizeConflictClause) |
---|
1496 | sat_MinimizeConflictClause(cm, clauseArray); |
---|
1497 | else |
---|
1498 | sat_ResetFlagForClauseArray(cm, clauseArray); |
---|
1499 | |
---|
1500 | if(maxSize > clauseArray->num/4 && maxSize > 5) { |
---|
1501 | nClauseArray = sat_ArrayAlloc(clauseArray->num); |
---|
1502 | |
---|
1503 | nMarked = 0; |
---|
1504 | tLevel = 0; |
---|
1505 | tObjectFlag |= (SATflags(conflicting) & ObjMask); |
---|
1506 | |
---|
1507 | sat_MarkNodeInConflict( |
---|
1508 | cm, d, &nMarked, &tObjectFlag, &tLevel, nClauseArray); |
---|
1509 | |
---|
1510 | /* Traverse implication graph backward */ |
---|
1511 | first = 1; |
---|
1512 | implied = d->implied; |
---|
1513 | space = implied->space+implied->num-1; |
---|
1514 | for(i=implied->num-1; i>=0; i--, space--) { |
---|
1515 | v = *space; |
---|
1516 | if(v == maxV) { |
---|
1517 | if(SATflags(v) & VisitedMask) { |
---|
1518 | SATflags(v) &= ResetVisitedMask; |
---|
1519 | --nMarked; |
---|
1520 | value = SATvalue(v); |
---|
1521 | sat_ArrayInsert(nClauseArray, v^(!value)); |
---|
1522 | } |
---|
1523 | continue; |
---|
1524 | } |
---|
1525 | |
---|
1526 | if(SATflags(v) & VisitedMask) { |
---|
1527 | SATflags(v) &= ResetVisitedMask; |
---|
1528 | --nMarked; |
---|
1529 | |
---|
1530 | if(nMarked == 0 && (!first || i == 0)) { |
---|
1531 | value = SATvalue(v); |
---|
1532 | tFdaLit = v^(!value); |
---|
1533 | sat_ArrayInsert(nClauseArray, tFdaLit); |
---|
1534 | break; |
---|
1535 | } |
---|
1536 | |
---|
1537 | ante= SATante(v); |
---|
1538 | inverted = SATisInverted(ante); |
---|
1539 | ante= SATnormalNode(ante); |
---|
1540 | |
---|
1541 | if(SATflags(ante) & IsCNFMask) { |
---|
1542 | size = SATnumLits(ante); |
---|
1543 | for(j=0, plit=(long*)SATfirstLit(ante); j<size; j++, plit++) { |
---|
1544 | nv = SATgetNode(*plit); |
---|
1545 | if(SATnormalNode(nv) != v) |
---|
1546 | sat_MarkNodeSub(cm, nv, &nMarked, &tLevel, d, nClauseArray); |
---|
1547 | } |
---|
1548 | } |
---|
1549 | else { |
---|
1550 | sat_MarkNodeSub(cm, ante, &nMarked, &tLevel, d, nClauseArray); |
---|
1551 | ante2 = SATante2(v); |
---|
1552 | if(ante2) |
---|
1553 | sat_MarkNodeSub(cm, ante2, &nMarked, &tLevel, d, nClauseArray); |
---|
1554 | } |
---|
1555 | } |
---|
1556 | first = 0; |
---|
1557 | } |
---|
1558 | sat_MinimizeConflictClause(cm, nClauseArray); |
---|
1559 | |
---|
1560 | inserted = 0; |
---|
1561 | if(clauseArray->num*4/5 > nClauseArray->num) { |
---|
1562 | learned = sat_AddConflictClauseNoScoreUpdate(cm, nClauseArray, tObjectFlag); |
---|
1563 | inserted = 1; |
---|
1564 | } |
---|
1565 | sat_ArrayFree(nClauseArray); |
---|
1566 | } |
---|
1567 | if( inserted == 0 && |
---|
1568 | depth > 20) { |
---|
1569 | nClauseArray = sat_ArrayAlloc(clauseArray->num); |
---|
1570 | |
---|
1571 | lBacktrace = depth/3; |
---|
1572 | uBacktrace = depth*2/3; |
---|
1573 | |
---|
1574 | /** HSJIN : depth, lBacktrace and uBacktrace may affect to |
---|
1575 | * performance **/ |
---|
1576 | markLimit = 1; |
---|
1577 | minLimit = 1000; |
---|
1578 | while(1){ |
---|
1579 | nMarked = 0; |
---|
1580 | tLevel = 0; |
---|
1581 | depth = 0; |
---|
1582 | nClauseArray->num = 0; |
---|
1583 | markLimit++; |
---|
1584 | if(markLimit > 3) break; |
---|
1585 | if(minLimit != 1000 && minLimit > 3) |
---|
1586 | break; |
---|
1587 | tObjectFlag |= (SATflags(conflicting) & ObjMask); |
---|
1588 | |
---|
1589 | sat_MarkNodeInConflict( |
---|
1590 | cm, d, &nMarked, &tObjectFlag, &tLevel, nClauseArray); |
---|
1591 | |
---|
1592 | first = 1; |
---|
1593 | implied = d->implied; |
---|
1594 | space = implied->space+implied->num-1; |
---|
1595 | for(i=implied->num-1; i>=0; i--, space--) { |
---|
1596 | v = *space; |
---|
1597 | if(uBacktrace < depth) { |
---|
1598 | sat_ResetFlagForClauseArray(cm, nClauseArray); |
---|
1599 | nClauseArray->num = 0; |
---|
1600 | for(; i>=0; i--, space--) { |
---|
1601 | v = *space; |
---|
1602 | if(SATflags(v) & VisitedMask) { |
---|
1603 | SATflags(v) &= ResetVisitedMask; |
---|
1604 | --nMarked; |
---|
1605 | if(nMarked == 0) |
---|
1606 | break; |
---|
1607 | } |
---|
1608 | } |
---|
1609 | break; |
---|
1610 | } |
---|
1611 | if(nMarked < minLimit) |
---|
1612 | minLimit = nMarked; |
---|
1613 | if(depth > lBacktrace && nMarked < markLimit) { |
---|
1614 | for(; i>=0; i--, space--) { |
---|
1615 | v = *space; |
---|
1616 | if(SATflags(v) & VisitedMask) { |
---|
1617 | SATflags(v) &= ResetVisitedMask; |
---|
1618 | --nMarked; |
---|
1619 | value = SATvalue(v); |
---|
1620 | sat_ArrayInsert(nClauseArray, v^(!value)); |
---|
1621 | if(nMarked == 0) |
---|
1622 | break; |
---|
1623 | } |
---|
1624 | } |
---|
1625 | } |
---|
1626 | |
---|
1627 | if(SATflags(v) & VisitedMask) { |
---|
1628 | depth = cm->variableArray[SATnodeID(v)].depth; |
---|
1629 | |
---|
1630 | SATflags(v) &= ResetVisitedMask; |
---|
1631 | --nMarked; |
---|
1632 | |
---|
1633 | if(nMarked == 0 && (!first || i == 0)) { |
---|
1634 | value = SATvalue(v); |
---|
1635 | tFdaLit = v^(!value); |
---|
1636 | sat_ArrayInsert(nClauseArray, tFdaLit); |
---|
1637 | break; |
---|
1638 | } |
---|
1639 | |
---|
1640 | ante= SATante(v); |
---|
1641 | inverted = SATisInverted(ante); |
---|
1642 | ante= SATnormalNode(ante); |
---|
1643 | |
---|
1644 | if(SATflags(ante) & IsCNFMask) { |
---|
1645 | size = SATnumLits(ante); |
---|
1646 | for(j=0, plit=(long*)SATfirstLit(ante); j<size; j++, plit++) { |
---|
1647 | nv = SATgetNode(*plit); |
---|
1648 | if(SATnormalNode(nv) != v) |
---|
1649 | sat_MarkNodeSub(cm, nv, &nMarked, &tLevel, d, nClauseArray); |
---|
1650 | } |
---|
1651 | } |
---|
1652 | else { |
---|
1653 | sat_MarkNodeSub(cm, ante, &nMarked, &tLevel, d, nClauseArray); |
---|
1654 | ante2 = SATante2(v); |
---|
1655 | if(ante2) |
---|
1656 | sat_MarkNodeSub(cm, ante2, &nMarked, &tLevel, d, nClauseArray); |
---|
1657 | } |
---|
1658 | } |
---|
1659 | first = 0; |
---|
1660 | } |
---|
1661 | if(nClauseArray->num == 0) |
---|
1662 | continue; |
---|
1663 | sat_MinimizeConflictClause(cm, nClauseArray); |
---|
1664 | |
---|
1665 | if(clauseArray->num*4/5 > nClauseArray->num) { |
---|
1666 | |
---|
1667 | learned = sat_AddConflictClauseNoScoreUpdate(cm, nClauseArray, tObjectFlag); |
---|
1668 | break; |
---|
1669 | } |
---|
1670 | } |
---|
1671 | sat_ArrayFree(nClauseArray); |
---|
1672 | } |
---|
1673 | |
---|
1674 | return; |
---|
1675 | } |
---|
1676 | |
---|
1677 | /**Function******************************************************************** |
---|
1678 | |
---|
1679 | Synopsis [ UIP Analysis that is used for UNSAT core generation.] |
---|
1680 | |
---|
1681 | Description [ UIP Analysis that is used for UNSAT core generation.] |
---|
1682 | |
---|
1683 | SideEffects [] |
---|
1684 | |
---|
1685 | SeeAlso [] |
---|
1686 | |
---|
1687 | ******************************************************************************/ |
---|
1688 | void |
---|
1689 | sat_FindUIPForCoreGen( |
---|
1690 | satManager_t *cm, |
---|
1691 | satArray_t *clauseArray, |
---|
1692 | satLevel_t *d, |
---|
1693 | int *objectFlag, |
---|
1694 | int *bLevel, |
---|
1695 | long *fdaLit) |
---|
1696 | { |
---|
1697 | long conflicting; |
---|
1698 | int nMarked, value; |
---|
1699 | long v; |
---|
1700 | int first, i; |
---|
1701 | long *space; |
---|
1702 | satArray_t *implied; |
---|
1703 | satOption_t *option; |
---|
1704 | |
---|
1705 | conflicting = d->conflict; |
---|
1706 | nMarked = 0; |
---|
1707 | option = cm->option; |
---|
1708 | if(option->incTraceObjective) *objectFlag = 0; |
---|
1709 | else *objectFlag = ObjMask; |
---|
1710 | |
---|
1711 | (*objectFlag) |= (SATflags(conflicting) & ObjMask); |
---|
1712 | |
---|
1713 | /* find seed from conflicting clause to find unique implication point. */ |
---|
1714 | clauseArray->num = 0; |
---|
1715 | sat_MarkNodeInConflict( |
---|
1716 | cm, d, &nMarked, objectFlag, bLevel, clauseArray); |
---|
1717 | |
---|
1718 | /* Traverse implication graph backward */ |
---|
1719 | first = 1; |
---|
1720 | implied = d->implied; |
---|
1721 | space = implied->space+implied->num-1; |
---|
1722 | /* Bing: UNSAT core generation */ |
---|
1723 | if(cm->option->coreGeneration){ |
---|
1724 | cm->dependenceArray = sat_ArrayAlloc(1); |
---|
1725 | sat_ArrayInsert(cm->dependenceArray,conflicting); |
---|
1726 | } |
---|
1727 | |
---|
1728 | for(i=implied->num-1; i>=0; i--, space--) { |
---|
1729 | v = *space; |
---|
1730 | if(SATflags(v) & VisitedMask) { |
---|
1731 | SATflags(v) &= ResetVisitedMask; |
---|
1732 | --nMarked; |
---|
1733 | |
---|
1734 | if(nMarked == 0 && (!first || i==0)) { |
---|
1735 | value = SATvalue(v); |
---|
1736 | *fdaLit = v^(!value); |
---|
1737 | sat_ArrayInsert(clauseArray, *fdaLit); |
---|
1738 | break; |
---|
1739 | } |
---|
1740 | |
---|
1741 | |
---|
1742 | /* Bing: UNSAT core generation */ |
---|
1743 | if(cm->option->coreGeneration){ |
---|
1744 | int ante = SATante(v); |
---|
1745 | if(ante!=0 && !(SATflags(ante) & IsCNFMask)){ |
---|
1746 | printf("node %d is not CNF\n", ante); |
---|
1747 | exit(0); |
---|
1748 | } |
---|
1749 | if(ante==0){ |
---|
1750 | if(!st_lookup(cm->anteTable, (char *)SATnormalNode(v), &ante)){ |
---|
1751 | printf("ante = 0 and is not in anteTable %ld\n",v); |
---|
1752 | exit(0); |
---|
1753 | } |
---|
1754 | } |
---|
1755 | sat_ArrayInsert(cm->dependenceArray,ante); |
---|
1756 | } |
---|
1757 | |
---|
1758 | |
---|
1759 | sat_MarkNodeInImpliedNode( |
---|
1760 | cm, d, v, &nMarked, objectFlag, bLevel, clauseArray); |
---|
1761 | } |
---|
1762 | first = 0; |
---|
1763 | } |
---|
1764 | |
---|
1765 | sat_ResetFlagForClauseArray(cm, clauseArray); |
---|
1766 | |
---|
1767 | return; |
---|
1768 | } |
---|
1769 | |
---|
1770 | /**Function******************************************************************** |
---|
1771 | |
---|
1772 | Synopsis [find UIP with resolution generation] |
---|
1773 | |
---|
1774 | Description [] |
---|
1775 | |
---|
1776 | SideEffects [] |
---|
1777 | |
---|
1778 | SeeAlso [] |
---|
1779 | |
---|
1780 | ******************************************************************************/ |
---|
1781 | |
---|
1782 | |
---|
1783 | void |
---|
1784 | sat_FindUIPForCoreGenWithRT( |
---|
1785 | satManager_t *cm, |
---|
1786 | satArray_t *clauseArray, |
---|
1787 | satLevel_t *d, |
---|
1788 | int *objectFlag, |
---|
1789 | int *bLevel, |
---|
1790 | long *fdaLit) |
---|
1791 | { |
---|
1792 | long conflicting; |
---|
1793 | int nMarked, value; |
---|
1794 | long v,left,right,inverted,result; |
---|
1795 | int first, i,size=0; |
---|
1796 | long *space,*tmp; |
---|
1797 | satArray_t *implied; |
---|
1798 | satOption_t *option; |
---|
1799 | RTnode_t tmprt; |
---|
1800 | long *lp, *tmpIP,ante,ante2,node,j; |
---|
1801 | RTManager_t * rm = cm->rm; |
---|
1802 | |
---|
1803 | conflicting = d->conflict; |
---|
1804 | nMarked = 0; |
---|
1805 | option = cm->option; |
---|
1806 | if(option->incTraceObjective) *objectFlag = 0; |
---|
1807 | else *objectFlag = ObjMask; |
---|
1808 | |
---|
1809 | (*objectFlag) |= (SATflags(conflicting) & ObjMask); |
---|
1810 | |
---|
1811 | /* find seed from conflicting clause to find unique implication point. */ |
---|
1812 | clauseArray->num = 0; |
---|
1813 | sat_MarkNodeInConflict( |
---|
1814 | cm, d, &nMarked, objectFlag, bLevel, clauseArray); |
---|
1815 | |
---|
1816 | /* Traverse implication graph backward */ |
---|
1817 | first = 1; |
---|
1818 | implied = d->implied; |
---|
1819 | space = implied->space+implied->num-1; |
---|
1820 | |
---|
1821 | |
---|
1822 | if(cm->option->coreGeneration){ |
---|
1823 | /*if last conflict is CNF*/ |
---|
1824 | if(SATflags(conflicting)&IsCNFMask){ |
---|
1825 | /*is conflict CNF*/ |
---|
1826 | if(SATflags(conflicting)&IsConflictMask){ |
---|
1827 | if(!st_lookup(cm->RTreeTable,(char*)conflicting,&tmprt)){ |
---|
1828 | printf("RTree node of conflict cnf %ld is not in RTreeTable\n",ante); |
---|
1829 | exit(0); |
---|
1830 | } |
---|
1831 | else{ |
---|
1832 | rm->root = tmprt; |
---|
1833 | #if PR |
---|
1834 | printf("Get formula for CONFLICT CLAUSE:%d\n",ante); |
---|
1835 | #endif |
---|
1836 | } |
---|
1837 | } |
---|
1838 | /*CNF but not conflict*/ |
---|
1839 | else{ |
---|
1840 | rm->root = RTCreateNode(rm); |
---|
1841 | |
---|
1842 | size = SATnumLits(conflicting); |
---|
1843 | RT_fSize(rm->root) = size; |
---|
1844 | lp = (long*)SATfirstLit(conflicting); |
---|
1845 | sat_BuildRT(cm,rm->root, lp, tmpIP,size,0); |
---|
1846 | } |
---|
1847 | } |
---|
1848 | /*if last conflict is AIG*/ |
---|
1849 | else{ |
---|
1850 | rm->root = RTCreateNode(rm); |
---|
1851 | node = SATnormalNode(conflicting); |
---|
1852 | left = SATleftChild(node); |
---|
1853 | right = SATrightChild(node); |
---|
1854 | result = PureSat_IdentifyConflict(cm,left,right,conflicting); |
---|
1855 | inverted = SATisInverted(left); |
---|
1856 | left = SATnormalNode(left); |
---|
1857 | left = inverted ? SATnot(left) : left; |
---|
1858 | |
---|
1859 | inverted = SATisInverted(right); |
---|
1860 | right = SATnormalNode(right); |
---|
1861 | right = inverted ? SATnot(right) : right; |
---|
1862 | |
---|
1863 | j = node; |
---|
1864 | |
---|
1865 | if(result == 1){ |
---|
1866 | tmp = ALLOC(long,3); |
---|
1867 | tmp[0] = left; |
---|
1868 | tmp[1] = SATnot(j); |
---|
1869 | size = 2; |
---|
1870 | } |
---|
1871 | else if(result == 2){ |
---|
1872 | tmp = ALLOC(long,3); |
---|
1873 | tmp[0] = right; |
---|
1874 | tmp[1] = SATnot(j); |
---|
1875 | size = 2; |
---|
1876 | } |
---|
1877 | else if(result == 3){ |
---|
1878 | tmp = ALLOC(long,4); |
---|
1879 | tmp[0] = SATnot(left); |
---|
1880 | tmp[1] = SATnot(right); |
---|
1881 | tmp[2] = j; |
---|
1882 | size = 3; |
---|
1883 | } |
---|
1884 | else{ |
---|
1885 | printf("wrong returned result value, exit\n"); |
---|
1886 | exit(0); |
---|
1887 | } |
---|
1888 | |
---|
1889 | lp = tmp; |
---|
1890 | sat_BuildRT(cm,rm->root, lp, tmpIP,size,1); |
---|
1891 | FREE(tmp); |
---|
1892 | } |
---|
1893 | } |
---|
1894 | |
---|
1895 | |
---|
1896 | |
---|
1897 | for(i=implied->num-1; i>=0; i--, space--) { |
---|
1898 | v = *space; |
---|
1899 | if(SATflags(v) & VisitedMask) { |
---|
1900 | SATflags(v) &= ResetVisitedMask; |
---|
1901 | --nMarked; |
---|
1902 | |
---|
1903 | if(nMarked == 0 && (!first || i==0)) { |
---|
1904 | value = SATvalue(v); |
---|
1905 | *fdaLit = v^(!value); |
---|
1906 | sat_ArrayInsert(clauseArray, *fdaLit); |
---|
1907 | break; |
---|
1908 | } |
---|
1909 | |
---|
1910 | |
---|
1911 | if(cm->option->coreGeneration){ |
---|
1912 | ante = SATante(v); |
---|
1913 | if(ante==0){ |
---|
1914 | if(!(st_lookup(cm->anteTable, (char *)SATnormalNode(v),&ante))){ |
---|
1915 | printf("ante = 0 and is not in anteTable %ld\n",v); |
---|
1916 | exit(0); |
---|
1917 | } |
---|
1918 | } |
---|
1919 | |
---|
1920 | /*build non-leaf node*/ |
---|
1921 | tmprt = RTCreateNode(rm); |
---|
1922 | RT_pivot(tmprt) = SATnormalNode(v); |
---|
1923 | RT_right(tmprt) = rm->root; |
---|
1924 | rm->root = tmprt; |
---|
1925 | |
---|
1926 | if((SATflags(ante)&IsConflictMask)&&(SATflags(ante)&IsCNFMask)){ |
---|
1927 | if(!st_lookup(cm->RTreeTable,(char*)ante,&tmprt)){ |
---|
1928 | printf("RTree node of conflict cnf %ld is not in RTreeTable\n",ante); |
---|
1929 | exit(0); |
---|
1930 | } |
---|
1931 | else{ |
---|
1932 | RT_left(rm->root) = tmprt; |
---|
1933 | #if PR |
---|
1934 | printf("Get formula for CONFLICT CLAUSE:%d\n",ante); |
---|
1935 | #endif |
---|
1936 | } |
---|
1937 | } |
---|
1938 | else{ /* if not conflict CNF*/ |
---|
1939 | /*left */ |
---|
1940 | tmprt = RTCreateNode(rm); |
---|
1941 | RT_left(rm->root) = tmprt; |
---|
1942 | /*left is AIG*/ |
---|
1943 | if(!(SATflags(ante) & IsCNFMask)){ |
---|
1944 | /*generate formula for left*/ |
---|
1945 | tmp = ALLOC(long,3); |
---|
1946 | value = SATvalue(v); |
---|
1947 | node = SATnormalNode(v); |
---|
1948 | node = value==1?node:SATnot(node); |
---|
1949 | tmp[0] = node; |
---|
1950 | |
---|
1951 | size = 1; |
---|
1952 | if(ante != SATnormalNode(v)){ |
---|
1953 | value = SATvalue(ante); |
---|
1954 | node = SATnormalNode(ante); |
---|
1955 | node = value==1?SATnot(node):node; |
---|
1956 | tmp[1] = node; |
---|
1957 | size++; |
---|
1958 | ante2 = SATante2(v); |
---|
1959 | if(ante2){ |
---|
1960 | value = SATvalue(ante2); |
---|
1961 | node = SATnormalNode(ante2); |
---|
1962 | node = value==1?SATnot(node):node; |
---|
1963 | tmp[2] = node; |
---|
1964 | size++; |
---|
1965 | } |
---|
1966 | } |
---|
1967 | |
---|
1968 | lp = tmp; |
---|
1969 | sat_BuildRT(cm,tmprt,lp,tmpIP,size,1); |
---|
1970 | FREE(tmp); |
---|
1971 | } |
---|
1972 | /* left is CNF*/ |
---|
1973 | else{ |
---|
1974 | |
---|
1975 | lp = (long*)SATfirstLit(ante); |
---|
1976 | size = SATnumLits(ante); |
---|
1977 | RT_fSize(tmprt) = size; |
---|
1978 | sat_BuildRT(cm,tmprt, lp, tmpIP,size,0); |
---|
1979 | } |
---|
1980 | } /*else{ // if not conflict CNF*/ |
---|
1981 | |
---|
1982 | }/*if(cm->option->coreGeneration){*/ |
---|
1983 | |
---|
1984 | |
---|
1985 | sat_MarkNodeInImpliedNode( |
---|
1986 | cm, d, v, &nMarked, objectFlag, bLevel, clauseArray); |
---|
1987 | } |
---|
1988 | first = 0; |
---|
1989 | } |
---|
1990 | |
---|
1991 | sat_ResetFlagForClauseArray(cm, clauseArray); |
---|
1992 | |
---|
1993 | return; |
---|
1994 | } |
---|
1995 | |
---|
1996 | |
---|
1997 | |
---|
1998 | /**Function******************************************************************** |
---|
1999 | |
---|
2000 | Synopsis [ Minimize the literals of conflict clause] |
---|
2001 | |
---|
2002 | Description [ If the literal can be implied by other literals in |
---|
2003 | conflict clause then we can delete it from conflict clause.] |
---|
2004 | |
---|
2005 | SideEffects [] |
---|
2006 | |
---|
2007 | SeeAlso [] |
---|
2008 | |
---|
2009 | ******************************************************************************/ |
---|
2010 | void |
---|
2011 | sat_MinimizeConflictClause( |
---|
2012 | satManager_t *cm, |
---|
2013 | satArray_t *clauseArray) |
---|
2014 | { |
---|
2015 | int i, j, size, all, tsize; |
---|
2016 | int inverted; |
---|
2017 | long v, tv; |
---|
2018 | long ante, ante2; |
---|
2019 | long *plit; |
---|
2020 | satArray_t *newArray; |
---|
2021 | satVariable_t *var; |
---|
2022 | |
---|
2023 | size = clauseArray->num; |
---|
2024 | newArray = sat_ArrayAlloc(size); |
---|
2025 | for(i=0; i<size; i++) { |
---|
2026 | v = clauseArray->space[i]; |
---|
2027 | inverted = SATisInverted(v); |
---|
2028 | v = SATnormalNode(v); |
---|
2029 | |
---|
2030 | ante = SATante(v); |
---|
2031 | ante = SATnormalNode(ante); |
---|
2032 | if(SATflags(ante) & IsCNFMask) { |
---|
2033 | tsize = SATnumLits(ante); |
---|
2034 | all = 1; |
---|
2035 | for(j=0, plit=(long*)SATfirstLit(ante); j<tsize; j++, plit++) { |
---|
2036 | tv = SATgetNode(*plit); |
---|
2037 | tv = SATnormalNode(tv); |
---|
2038 | if(tv == v) continue; |
---|
2039 | if(!(SATflags(tv) & NewMask)) { |
---|
2040 | all = 0; |
---|
2041 | break; |
---|
2042 | } |
---|
2043 | } |
---|
2044 | if(all) { |
---|
2045 | var = SATgetVariable(v); |
---|
2046 | if(inverted) (var->litsCount[1])++; |
---|
2047 | else (var->litsCount[0])++; |
---|
2048 | continue; |
---|
2049 | } |
---|
2050 | } |
---|
2051 | else { |
---|
2052 | if(SATflags(ante) & NewMask) { |
---|
2053 | ante2 = SATante2(v); |
---|
2054 | ante2 = SATnormalNode(ante2); |
---|
2055 | if((ante2==0) || (SATflags(ante2) & NewMask)) { |
---|
2056 | var = SATgetVariable(v); |
---|
2057 | if(inverted) (var->litsCount[1])++; |
---|
2058 | else (var->litsCount[0])++; |
---|
2059 | continue; |
---|
2060 | } |
---|
2061 | } |
---|
2062 | } |
---|
2063 | sat_ArrayInsert(newArray, v^inverted); |
---|
2064 | } |
---|
2065 | sat_ResetFlagForClauseArray(cm, clauseArray); |
---|
2066 | memcpy(clauseArray->space, newArray->space, sizeof(long)*(newArray->num)); |
---|
2067 | clauseArray->num = newArray->num; |
---|
2068 | sat_ArrayFree(newArray); |
---|
2069 | } |
---|
2070 | |
---|
2071 | /**Function******************************************************************** |
---|
2072 | |
---|
2073 | Synopsis [ Reset flags that are used to indentify conflict clause] |
---|
2074 | |
---|
2075 | Description [ Reset flags that are used to indentify conflict clause] |
---|
2076 | |
---|
2077 | SideEffects [] |
---|
2078 | |
---|
2079 | SeeAlso [] |
---|
2080 | |
---|
2081 | ******************************************************************************/ |
---|
2082 | void |
---|
2083 | sat_ResetFlagForClauseArray( |
---|
2084 | satManager_t *cm, |
---|
2085 | satArray_t *clauseArray) |
---|
2086 | { |
---|
2087 | int size, i; |
---|
2088 | long v; |
---|
2089 | |
---|
2090 | size = clauseArray->num; |
---|
2091 | for(i=0; i<size; i++) { |
---|
2092 | v = clauseArray->space[i]; |
---|
2093 | v = SATnormalNode(v); |
---|
2094 | SATflags(v) &= ResetNewVisitedMask; |
---|
2095 | } |
---|
2096 | } |
---|
2097 | |
---|
2098 | /**Function******************************************************************** |
---|
2099 | |
---|
2100 | Synopsis [ Find seed for unique implication point analysis |
---|
2101 | from conflicting clause] |
---|
2102 | |
---|
2103 | Description [ Find seed for unique implication point analysis |
---|
2104 | from conflicting clause] |
---|
2105 | |
---|
2106 | SideEffects [] |
---|
2107 | |
---|
2108 | SeeAlso [] |
---|
2109 | |
---|
2110 | ******************************************************************************/ |
---|
2111 | void |
---|
2112 | sat_MarkNodeInConflict( |
---|
2113 | satManager_t *cm, |
---|
2114 | satLevel_t *d, |
---|
2115 | int *nMarked, |
---|
2116 | int *objectFlag, |
---|
2117 | int *bLevel, |
---|
2118 | satArray_t *clauseArray) |
---|
2119 | { |
---|
2120 | satOption_t *option; |
---|
2121 | |
---|
2122 | option = cm->option; |
---|
2123 | if(option->incTraceObjective == 0) { |
---|
2124 | sat_MarkNodeInConflictClauseNoObj( |
---|
2125 | cm, d, nMarked, objectFlag, bLevel, clauseArray); |
---|
2126 | } |
---|
2127 | else if(option->incTraceObjective == 1) { /* conservative */ |
---|
2128 | sat_MarkNodeInConflictClauseObjConservative( |
---|
2129 | cm, d, nMarked, objectFlag, bLevel, clauseArray); |
---|
2130 | } |
---|
2131 | } |
---|
2132 | |
---|
2133 | /**Function******************************************************************** |
---|
2134 | |
---|
2135 | Synopsis [ Traverse the antecedent to find unique implication point] |
---|
2136 | |
---|
2137 | Description [ Traverse the antecedent to find unique implication point] |
---|
2138 | |
---|
2139 | SideEffects [] |
---|
2140 | |
---|
2141 | SeeAlso [] |
---|
2142 | |
---|
2143 | ******************************************************************************/ |
---|
2144 | void |
---|
2145 | sat_MarkNodeInImpliedNode( |
---|
2146 | satManager_t *cm, |
---|
2147 | satLevel_t *d, |
---|
2148 | long v, |
---|
2149 | int *nMarked, |
---|
2150 | int *objectFlag, |
---|
2151 | int *bLevel, |
---|
2152 | satArray_t *clauseArray) |
---|
2153 | { |
---|
2154 | satOption_t *option; |
---|
2155 | |
---|
2156 | option = cm->option; |
---|
2157 | if(option->incTraceObjective == 0) { |
---|
2158 | sat_MarkNodeInImpliedNodeNoObj( |
---|
2159 | cm, d, v, nMarked, objectFlag, bLevel, clauseArray); |
---|
2160 | } |
---|
2161 | else if(option->incTraceObjective == 1) { /* conservative */ |
---|
2162 | sat_MarkNodeInImpliedNodeObjConservative( |
---|
2163 | cm, d, v, nMarked, objectFlag, bLevel, clauseArray); |
---|
2164 | } |
---|
2165 | } |
---|
2166 | |
---|
2167 | /**Function******************************************************************** |
---|
2168 | |
---|
2169 | Synopsis [ If the node is implied in current level then mark it, |
---|
2170 | otherwise add it to conflict clause] |
---|
2171 | |
---|
2172 | Description [ If the node is implied in current level then mark it, |
---|
2173 | otherwise add it to conflict clause] |
---|
2174 | |
---|
2175 | SideEffects [] |
---|
2176 | |
---|
2177 | SeeAlso [] |
---|
2178 | |
---|
2179 | ******************************************************************************/ |
---|
2180 | void |
---|
2181 | sat_MarkNodeSub( |
---|
2182 | satManager_t *cm, |
---|
2183 | long v, |
---|
2184 | int *nMarked, |
---|
2185 | int *bLevel, |
---|
2186 | satLevel_t *d, |
---|
2187 | satArray_t *clauseArray) |
---|
2188 | { |
---|
2189 | satLevel_t *td; |
---|
2190 | satOption_t *option; |
---|
2191 | int value; |
---|
2192 | |
---|
2193 | v = SATnormalNode(v); |
---|
2194 | |
---|
2195 | td = SATgetDecision(SATlevel(v)); |
---|
2196 | if(d == td) { |
---|
2197 | if(!(SATflags(v) & VisitedMask)) { |
---|
2198 | (*nMarked)++; |
---|
2199 | SATflags(v) |= VisitedMask; |
---|
2200 | } |
---|
2201 | } |
---|
2202 | else if(td->level < d->level) { |
---|
2203 | if(!(SATflags(v) & NewMask)) { |
---|
2204 | option = cm->option; |
---|
2205 | if((td->level != 0) || |
---|
2206 | (td->level == 0 && option->includeLevelZeroLiteral)) { |
---|
2207 | SATflags(v) |= NewMask; |
---|
2208 | value = SATvalue(v); |
---|
2209 | sat_ArrayInsert(clauseArray, v^(!value)); |
---|
2210 | if(*bLevel < td->level) |
---|
2211 | *bLevel = td->level; |
---|
2212 | } |
---|
2213 | } |
---|
2214 | } |
---|
2215 | return; |
---|
2216 | } |
---|
2217 | |
---|
2218 | /**Function******************************************************************** |
---|
2219 | |
---|
2220 | Synopsis [ Traverse the antecedent to find unique implication point] |
---|
2221 | |
---|
2222 | Description [ Traverse the antecedent to find unique implication point] |
---|
2223 | |
---|
2224 | SideEffects [] |
---|
2225 | |
---|
2226 | SeeAlso [] |
---|
2227 | |
---|
2228 | ******************************************************************************/ |
---|
2229 | void |
---|
2230 | sat_MarkNodeInImpliedNodeNoObj( |
---|
2231 | satManager_t *cm, |
---|
2232 | satLevel_t *d, |
---|
2233 | long v, |
---|
2234 | int *nMarked, |
---|
2235 | int *oFlag, |
---|
2236 | int *bLevel, |
---|
2237 | satArray_t *clauseArray) |
---|
2238 | { |
---|
2239 | long ante, ante2, nv; |
---|
2240 | int inverted, size, i; |
---|
2241 | long *plit; |
---|
2242 | satOption_t *option; |
---|
2243 | |
---|
2244 | ante= SATante(v); |
---|
2245 | /* Bing: UNSAT core generation */ |
---|
2246 | if(cm->option->coreGeneration){ |
---|
2247 | if(ante==0){ |
---|
2248 | if(!(st_lookup(cm->anteTable, (char *)(long)SATnormalNode(v), &ante))){ |
---|
2249 | printf("ante = 0 and is not in anteTable %ld\n",v); |
---|
2250 | exit(0); |
---|
2251 | } |
---|
2252 | } |
---|
2253 | } |
---|
2254 | inverted = SATisInverted(ante); |
---|
2255 | ante= SATnormalNode(ante); |
---|
2256 | |
---|
2257 | option = cm->option; |
---|
2258 | if(SATflags(ante) & IsCNFMask) { |
---|
2259 | SATconflictUsage(ante)++; |
---|
2260 | size = SATnumLits(ante); |
---|
2261 | for(i=0, plit=(long*)SATfirstLit(ante); i<size; i++, plit++) { |
---|
2262 | nv = SATgetNode(*plit); |
---|
2263 | if((int)(SATnormalNode(nv)) == v) continue; |
---|
2264 | sat_MarkNodeSub(cm, nv, nMarked, bLevel, d, clauseArray); |
---|
2265 | } |
---|
2266 | } |
---|
2267 | else { |
---|
2268 | /*Bing: very inmportant for level zero conflict analysis*/ |
---|
2269 | if(ante != SATnormalNode(v)) |
---|
2270 | sat_MarkNodeSub(cm, ante, nMarked, bLevel, d, clauseArray); |
---|
2271 | |
---|
2272 | ante2 = SATante2(v); |
---|
2273 | if(ante2) |
---|
2274 | sat_MarkNodeSub(cm, ante2, nMarked, bLevel, d, clauseArray); |
---|
2275 | } |
---|
2276 | } |
---|
2277 | |
---|
2278 | |
---|
2279 | /**Function******************************************************************** |
---|
2280 | |
---|
2281 | Synopsis [ Traverse the antecedent to find unique implication point] |
---|
2282 | |
---|
2283 | Description [ Traverse the antecedent to find unique implication point] |
---|
2284 | |
---|
2285 | SideEffects [] |
---|
2286 | |
---|
2287 | SeeAlso [] |
---|
2288 | |
---|
2289 | ******************************************************************************/ |
---|
2290 | void |
---|
2291 | sat_MarkNodeInImpliedNodeObjConservative( |
---|
2292 | satManager_t *cm, |
---|
2293 | satLevel_t *d, |
---|
2294 | long v, |
---|
2295 | int *nMarked, |
---|
2296 | int *oFlag, |
---|
2297 | int *bLevel, |
---|
2298 | satArray_t *clauseArray) |
---|
2299 | { |
---|
2300 | long ante, ante2, nv; |
---|
2301 | int inverted, size, i; |
---|
2302 | int objectFlag; |
---|
2303 | long *plit; |
---|
2304 | satOption_t *option; |
---|
2305 | |
---|
2306 | ante= SATante(v); |
---|
2307 | /* Bing: UNSAT core generation */ |
---|
2308 | if(cm->option->coreGeneration){ |
---|
2309 | if(ante==0){ |
---|
2310 | if(!(st_lookup(cm->anteTable, (char *)SATnormalNode(v), &ante))){ |
---|
2311 | printf("ante = 0 and is not in anteTable %ld\n",v); |
---|
2312 | exit(0); |
---|
2313 | } |
---|
2314 | } |
---|
2315 | } |
---|
2316 | inverted = SATisInverted(ante); |
---|
2317 | ante= SATnormalNode(ante); |
---|
2318 | |
---|
2319 | objectFlag = 0; |
---|
2320 | option = cm->option; |
---|
2321 | if(SATflags(ante) & IsCNFMask) { |
---|
2322 | SATconflictUsage(ante)++; |
---|
2323 | size = SATnumLits(ante); |
---|
2324 | for(i=0, plit=(long*)SATfirstLit(ante); i<size; i++, plit++) { |
---|
2325 | nv = SATgetNode(*plit); |
---|
2326 | nv = SATnormalNode(nv); |
---|
2327 | if(nv == v) continue; |
---|
2328 | sat_MarkNodeSub(cm, nv, nMarked, bLevel, d, clauseArray); |
---|
2329 | } |
---|
2330 | objectFlag |= SATflags(ante) & ObjMask; |
---|
2331 | } |
---|
2332 | else { |
---|
2333 | /*Bing: very inmportant for level zero conflict analysis*/ |
---|
2334 | if(ante != SATnormalNode(v)) |
---|
2335 | sat_MarkNodeSub(cm, ante, nMarked, bLevel, d, clauseArray); |
---|
2336 | |
---|
2337 | ante2 = SATante2(v); |
---|
2338 | if(ante2) { |
---|
2339 | ante2 = SATnormalNode(ante2); |
---|
2340 | sat_MarkNodeSub(cm, ante2, nMarked, bLevel, d, clauseArray); |
---|
2341 | } |
---|
2342 | } |
---|
2343 | *oFlag |= objectFlag; |
---|
2344 | } |
---|
2345 | |
---|
2346 | |
---|
2347 | /**Function******************************************************************** |
---|
2348 | |
---|
2349 | Synopsis [ Find seed for unique implication point analysis |
---|
2350 | from conflicting clause] |
---|
2351 | |
---|
2352 | Description [ Find seed for unique implication point analysis |
---|
2353 | from conflicting clause] |
---|
2354 | |
---|
2355 | SideEffects [] |
---|
2356 | |
---|
2357 | SeeAlso [] |
---|
2358 | |
---|
2359 | ******************************************************************************/ |
---|
2360 | void |
---|
2361 | sat_MarkNodeInConflictClauseNoObj( |
---|
2362 | satManager_t *cm, |
---|
2363 | satLevel_t *d, |
---|
2364 | int *nMarked, |
---|
2365 | int *oFlag, |
---|
2366 | int *bLevel, |
---|
2367 | satArray_t *clauseArray) |
---|
2368 | { |
---|
2369 | long conflict, left, right, nv; |
---|
2370 | int inverted, size, value, i; |
---|
2371 | long *plit; |
---|
2372 | satOption_t *option; |
---|
2373 | |
---|
2374 | conflict = d->conflict; |
---|
2375 | inverted = SATisInverted(conflict); |
---|
2376 | conflict = SATnormalNode(conflict); |
---|
2377 | |
---|
2378 | option = cm->option; |
---|
2379 | if(SATflags(conflict) & IsCNFMask) { |
---|
2380 | size = SATnumLits(conflict); |
---|
2381 | for(i=0, plit=(long*)SATfirstLit(conflict); i<size; i++, plit++) { |
---|
2382 | nv = SATgetNode(*plit); |
---|
2383 | sat_MarkNodeSub(cm, nv, nMarked, bLevel, d, clauseArray); |
---|
2384 | } |
---|
2385 | } |
---|
2386 | else { |
---|
2387 | value = SATvalue(conflict); |
---|
2388 | if(value == 1) { |
---|
2389 | sat_MarkNodeSub(cm, conflict, nMarked, bLevel, d, clauseArray); |
---|
2390 | |
---|
2391 | left = SATleftChild(conflict); |
---|
2392 | inverted = SATisInverted(left); |
---|
2393 | left = SATnormalNode(left); |
---|
2394 | value = SATvalue(left) ^ inverted; |
---|
2395 | if(value == 0) { |
---|
2396 | sat_MarkNodeSub(cm, left, nMarked, bLevel, d, clauseArray); |
---|
2397 | return; |
---|
2398 | } |
---|
2399 | |
---|
2400 | right = SATrightChild(conflict); |
---|
2401 | inverted = SATisInverted(right); |
---|
2402 | right = SATnormalNode(right); |
---|
2403 | value = SATvalue(right) ^ inverted; |
---|
2404 | if(value == 0) { |
---|
2405 | sat_MarkNodeSub(cm, right, nMarked, bLevel, d, clauseArray); |
---|
2406 | return; |
---|
2407 | } |
---|
2408 | } |
---|
2409 | else if(value == 0) { |
---|
2410 | left = SATleftChild(conflict); |
---|
2411 | right = SATrightChild(conflict); |
---|
2412 | sat_MarkNodeSub(cm, conflict, nMarked, bLevel, d, clauseArray); |
---|
2413 | sat_MarkNodeSub(cm, left, nMarked, bLevel, d, clauseArray); |
---|
2414 | sat_MarkNodeSub(cm, right, nMarked, bLevel, d, clauseArray); |
---|
2415 | } |
---|
2416 | } |
---|
2417 | } |
---|
2418 | |
---|
2419 | /**Function******************************************************************** |
---|
2420 | |
---|
2421 | Synopsis [ Find seed for unique implication point analysis |
---|
2422 | from conflicting clause] |
---|
2423 | |
---|
2424 | Description [ Find seed for unique implication point analysis |
---|
2425 | from conflicting clause] |
---|
2426 | |
---|
2427 | SideEffects [] |
---|
2428 | |
---|
2429 | SeeAlso [] |
---|
2430 | |
---|
2431 | ******************************************************************************/ |
---|
2432 | void |
---|
2433 | sat_MarkNodeInConflictClauseObjConservative( |
---|
2434 | satManager_t *cm, |
---|
2435 | satLevel_t *d, |
---|
2436 | int *nMarked, |
---|
2437 | int *oFlag, |
---|
2438 | int *bLevel, |
---|
2439 | satArray_t *clauseArray) |
---|
2440 | { |
---|
2441 | long conflict, left, right, nv; |
---|
2442 | int inverted, size, value, i; |
---|
2443 | long *plit; |
---|
2444 | satOption_t *option; |
---|
2445 | |
---|
2446 | conflict = d->conflict; |
---|
2447 | inverted = SATisInverted(conflict); |
---|
2448 | conflict = SATnormalNode(conflict); |
---|
2449 | |
---|
2450 | option = cm->option; |
---|
2451 | if(SATflags(conflict) & IsCNFMask) { |
---|
2452 | size = SATnumLits(conflict); |
---|
2453 | for(i=0, plit=(long*)SATfirstLit(conflict); i<size; i++, plit++) { |
---|
2454 | nv = SATgetNode(*plit); |
---|
2455 | *oFlag |= (SATflags(nv) & ObjMask); |
---|
2456 | sat_MarkNodeSub(cm, nv, nMarked, bLevel, d, clauseArray); |
---|
2457 | } |
---|
2458 | } |
---|
2459 | else { |
---|
2460 | value = SATvalue(conflict); |
---|
2461 | if(value == 1) { |
---|
2462 | *oFlag |= (SATflags(conflict) & ObjMask); |
---|
2463 | sat_MarkNodeSub(cm, conflict, nMarked, bLevel, d, clauseArray); |
---|
2464 | |
---|
2465 | left = SATleftChild(conflict); |
---|
2466 | inverted = SATisInverted(left); |
---|
2467 | left = SATnormalNode(left); |
---|
2468 | value = SATvalue(left) ^ inverted; |
---|
2469 | if(value == 0) { |
---|
2470 | *oFlag |= (SATflags(left) & ObjMask); |
---|
2471 | sat_MarkNodeSub(cm, left, nMarked, bLevel, d, clauseArray); |
---|
2472 | return; |
---|
2473 | } |
---|
2474 | |
---|
2475 | right = SATrightChild(conflict); |
---|
2476 | inverted = SATisInverted(right); |
---|
2477 | right = SATnormalNode(right); |
---|
2478 | value = SATvalue(right) ^ inverted; |
---|
2479 | if(value == 0) { |
---|
2480 | *oFlag |= (SATflags(right) & ObjMask); |
---|
2481 | sat_MarkNodeSub(cm, right, nMarked, bLevel, d, clauseArray); |
---|
2482 | return; |
---|
2483 | } |
---|
2484 | } |
---|
2485 | else if(value == 0) { |
---|
2486 | *oFlag |= (SATflags(conflict) & ObjMask); |
---|
2487 | |
---|
2488 | left = SATleftChild(conflict); |
---|
2489 | inverted = SATisInverted(left); |
---|
2490 | left = SATnormalNode(left); |
---|
2491 | *oFlag |= (SATflags(left) & ObjMask); |
---|
2492 | |
---|
2493 | right = SATrightChild(conflict); |
---|
2494 | inverted = SATisInverted(right); |
---|
2495 | right = SATnormalNode(right); |
---|
2496 | *oFlag |= (SATflags(right) & ObjMask); |
---|
2497 | |
---|
2498 | sat_MarkNodeSub(cm, conflict, nMarked, bLevel, d, clauseArray); |
---|
2499 | sat_MarkNodeSub(cm, left, nMarked, bLevel, d, clauseArray); |
---|
2500 | sat_MarkNodeSub(cm, right, nMarked, bLevel, d, clauseArray); |
---|
2501 | } |
---|
2502 | } |
---|
2503 | } |
---|
2504 | |
---|
2505 | |
---|
2506 | /**Function******************************************************************** |
---|
2507 | |
---|
2508 | Synopsis [ Backtrack to given decision level ] |
---|
2509 | |
---|
2510 | Description [ Backtrack to given decision level ] |
---|
2511 | |
---|
2512 | SideEffects [] |
---|
2513 | |
---|
2514 | SeeAlso [] |
---|
2515 | |
---|
2516 | ******************************************************************************/ |
---|
2517 | void |
---|
2518 | sat_Backtrack( |
---|
2519 | satManager_t *cm, |
---|
2520 | int level) |
---|
2521 | { |
---|
2522 | satLevel_t *d; |
---|
2523 | |
---|
2524 | /*Bing*/ |
---|
2525 | if(cm->option->ForceFinish == 0) |
---|
2526 | if(level < 0) return; |
---|
2527 | |
---|
2528 | d = SATgetDecision(cm->currentDecision); |
---|
2529 | while(1) { |
---|
2530 | if(d->level <= level) |
---|
2531 | break; |
---|
2532 | |
---|
2533 | sat_Undo(cm, d); |
---|
2534 | cm->currentDecision--; |
---|
2535 | if(cm->currentDecision == -1) |
---|
2536 | break; |
---|
2537 | d = SATgetDecision(cm->currentDecision); |
---|
2538 | } |
---|
2539 | return; |
---|
2540 | } |
---|
2541 | |
---|
2542 | |
---|
2543 | /**Function******************************************************************** |
---|
2544 | |
---|
2545 | Synopsis [ Undo implication] |
---|
2546 | |
---|
2547 | Description [ Undo implication] |
---|
2548 | |
---|
2549 | SideEffects [] |
---|
2550 | |
---|
2551 | SeeAlso [] |
---|
2552 | |
---|
2553 | ******************************************************************************/ |
---|
2554 | void |
---|
2555 | sat_Undo( |
---|
2556 | satManager_t *cm, |
---|
2557 | satLevel_t *d) |
---|
2558 | { |
---|
2559 | satArray_t *implied, *satisfied; |
---|
2560 | satVariable_t *var; |
---|
2561 | int size, i; |
---|
2562 | long *space, v; |
---|
2563 | |
---|
2564 | implied = d->implied; |
---|
2565 | space = implied->space; |
---|
2566 | size = implied->num; |
---|
2567 | for(i=0; i<size; i++, space++) { |
---|
2568 | v = *space; |
---|
2569 | |
---|
2570 | SATvalue(v) = 2; |
---|
2571 | SATflags(v) &= ResetNewVisitedObjInQueueMask; |
---|
2572 | var = &(cm->variableArray[SATnodeID(v)]); |
---|
2573 | var->antecedent = 0; |
---|
2574 | var->antecedent2 = 0; |
---|
2575 | var->level = -1; |
---|
2576 | var->depth = 0; |
---|
2577 | } |
---|
2578 | |
---|
2579 | cm->implicatedSoFar -= size; |
---|
2580 | |
---|
2581 | if(d->satisfied) { |
---|
2582 | satisfied = d->implied; |
---|
2583 | space = satisfied->space; |
---|
2584 | size = satisfied->num; |
---|
2585 | for(i=0; i<size; i++, space++) { |
---|
2586 | v = *space; |
---|
2587 | |
---|
2588 | SATflags(v) &= ResetBDDSatisfiedMask; |
---|
2589 | } |
---|
2590 | d->satisfied->num = 0; |
---|
2591 | } |
---|
2592 | if(d->level > 0) { |
---|
2593 | if((cm->decisionHead[d->level-1]).currentVarPos < cm->currentVarPos) |
---|
2594 | cm->currentVarPos = (cm->decisionHead[d->level-1]).currentVarPos; |
---|
2595 | } |
---|
2596 | else |
---|
2597 | cm->currentVarPos = d->currentVarPos; |
---|
2598 | |
---|
2599 | d->implied->num = 0; |
---|
2600 | d->currentVarPos = 0; |
---|
2601 | d->conflict = 0; |
---|
2602 | |
---|
2603 | |
---|
2604 | } |
---|
2605 | |
---|
2606 | /**Function******************************************************************** |
---|
2607 | |
---|
2608 | Synopsis [ Compare decision level of variable ] |
---|
2609 | |
---|
2610 | Description [ Compare decision level of variable ] |
---|
2611 | |
---|
2612 | SideEffects [] |
---|
2613 | |
---|
2614 | SeeAlso [] |
---|
2615 | |
---|
2616 | ******************************************************************************/ |
---|
2617 | |
---|
2618 | static int |
---|
2619 | levelCompare( |
---|
2620 | const void * node1, |
---|
2621 | const void * node2) |
---|
2622 | { |
---|
2623 | long v1, v2; |
---|
2624 | int l1, l2; |
---|
2625 | |
---|
2626 | v1 = *(int *)(node1); |
---|
2627 | v2 = *(int *)(node2); |
---|
2628 | l1 = SATcm->variableArray[SATnodeID(v1)].level; |
---|
2629 | l2 = SATcm->variableArray[SATnodeID(v2)].level; |
---|
2630 | |
---|
2631 | if(l1 == l2) return(v1 > v2); |
---|
2632 | return (l1 > l2); |
---|
2633 | } |
---|