void ToCNFAIG::toCNF(const BBNodeAIG& top, Cnf_Dat_t*& cnfData, ToSATBase::ASTNodeToSATVar& nodeToVar, bool needAbsRef, BBNodeManagerAIG& mgr) { assert(cnfData == NULL); Aig_ObjCreatePo(mgr.aigMgr, top.n); if (!needAbsRef) { Aig_ManCleanup( mgr.aigMgr); // remove nodes not connected to the PO. } Aig_ManCheck( mgr.aigMgr); // check that AIG looks ok. assert(Aig_ManPoNum(mgr.aigMgr) == 1); // UseZeroes gives assertion errors. // Rewriting is sometimes very slow. Can it be configured to be faster? // What about refactoring??? int nodeCount = mgr.aigMgr->nObjs[AIG_OBJ_AND]; if (uf.stats_flag) cerr << "Nodes before AIG rewrite:" << nodeCount << endl; if (!needAbsRef && uf.isSet("aig-rewrite","0")) { Dar_LibStart(); Aig_Man_t * pTemp; Dar_RwrPar_t Pars, *pPars = &Pars; Dar_ManDefaultRwrParams(pPars); // Assertion errors occur with this enabled. // pPars->fUseZeros = 1; // For mul63bit.smt2 with iterations =3 & nCutsMax = 8 // CNF generation was taking 139 seconds, solving 10 seconds. // With nCutsMax =2, CNF generation takes 16 seconds, solving 10 seconds. // The rewriting doesn't remove as many nodes of course.. int iterations = 3; for (int i = 0; i < iterations; i++) { mgr.aigMgr = Aig_ManDup(pTemp = mgr.aigMgr, 0); Aig_ManStop(pTemp); Dar_ManRewrite(mgr.aigMgr, pPars); mgr.aigMgr = Aig_ManDup(pTemp = mgr.aigMgr, 0); Aig_ManStop(pTemp); if (uf.stats_flag) cerr << "After rewrite [" << i << "] nodes:" << mgr.aigMgr->nObjs[AIG_OBJ_AND] << endl; if (nodeCount == mgr.aigMgr->nObjs[AIG_OBJ_AND]) break; } } if (!uf.isSet("simple-cnf","0")) { cnfData = Cnf_Derive(mgr.aigMgr, 0); if (uf.stats_flag) cerr << "advanced CNF" << endl; } else { cnfData = Cnf_DeriveSimple(mgr.aigMgr, 0); if (uf.stats_flag) cerr << "simple CNF" << endl; } BBNodeManagerAIG::SymbolToBBNode::const_iterator it; assert(nodeToVar.size() == 0); //todo. cf. with addvariables above... // Each symbol maps to a vector of CNF variables. for (it = mgr.symbolToBBNode.begin(); it != mgr.symbolToBBNode.end(); it++) { const ASTNode& n = it->first; const vector<BBNodeAIG> &b = it->second; assert(nodeToVar.find(n) == nodeToVar.end()); const int width = (n.GetType() == BOOLEAN_TYPE) ? 1 : n.GetValueWidth(); // INT_MAX for parts of symbols that didn't get encoded. vector<unsigned> v(width, ~((unsigned) 0)); for (unsigned i = 0; i < b.size(); i++) { if (!b[i].IsNull()) { Aig_Obj_t * pObj; pObj = (Aig_Obj_t*) Vec_PtrEntry(mgr.aigMgr->vPis, b[i].symbol_index); v[i] = cnfData->pVarNums[pObj->Id]; } } nodeToVar.insert(make_pair(n, v)); } assert(cnfData != NULL); }
ABC_NAMESPACE_IMPL_START //////////////////////////////////////////////////////////////////////// /// DECLARATIONS /// //////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////// /// FUNCTION DEFINITIONS /// //////////////////////////////////////////////////////////////////////// /**Function************************************************************* Synopsis [The main() procedure.] Description [] SideEffects [] SeeAlso [] ***********************************************************************/ int main( int argc, char * argv[] ) { int fEnableBmcOnly = 0; // enable to make it BMC-only int fEnableCounter = 1; // should be 1 in the final version int fEnableComment = 0; // should be 0 in the final version Fra_Sec_t SecPar, * pSecPar = &SecPar; FILE * pFile; Aig_Man_t * pAig; int RetValue = -1; int Depth = -1; // BMC parameters int nFrames = 50; int nSizeMax = 500000; int nBTLimit = 10000; int fRewrite = 0; int fNewAlgo = 1; int fVerbose = 0; clock_t clkTotal = clock(); if ( argc != 2 ) { printf( " Expecting one command-line argument (an input file in AIGER format).\n" ); printf( " usage: %s <file.aig>\n", argv[0] ); return 0; } pFile = fopen( argv[1], "r" ); if ( pFile == NULL ) { printf( " Cannot open input AIGER file \"%s\".\n", argv[1] ); printf( " usage: %s <file.aig>\n", argv[0] ); return 0; } fclose( pFile ); pAig = Ioa_ReadAiger( argv[1], 1 ); if ( pAig == NULL ) { printf( " Parsing the AIGER file \"%s\" has failed.\n", argv[1] ); printf( " usage: %s <file.aig>\n", argv[0] ); return 0; } Aig_ManSetRegNum( pAig, pAig->nRegs ); if ( !fEnableBmcOnly ) { // perform BMC if ( pAig->nRegs != 0 ) RetValue = Saig_ManBmcSimple( pAig, nFrames, nSizeMax, nBTLimit, fRewrite, fVerbose, NULL, 0 ); // perform full-blown SEC if ( RetValue != 0 ) { extern void Dar_LibStart(); extern void Dar_LibStop(); extern void Cnf_ManFree(); Fra_SecSetDefaultParams( pSecPar ); pSecPar->TimeLimit = 600; pSecPar->nFramesMax = 4; // the max number of frames used for induction pSecPar->fPhaseAbstract = 0; // disable phase-abstraction pSecPar->fSilent = 1; // disable phase-abstraction Dar_LibStart(); RetValue = Fra_FraigSec( pAig, pSecPar, NULL ); Dar_LibStop(); Cnf_ManFree(); } } // perform BMC again if ( RetValue == -1 && pAig->nRegs != 0 ) { int nFrames = 200; int nSizeMax = 500000; int nBTLimit = 10000000; int fRewrite = 0; RetValue = Saig_ManBmcSimple( pAig, nFrames, nSizeMax, nBTLimit, fRewrite, fVerbose, &Depth, 0 ); if ( RetValue != 0 ) RetValue = -1; } // decide how to report the output pFile = stdout; // report the result if ( RetValue == 0 ) { // fprintf(stdout, "s SATIFIABLE\n"); fprintf( pFile, "1" ); if ( fEnableCounter ) { printf( "\n" ); if ( pAig->pSeqModel ) Fra_SmlWriteCounterExample( pFile, pAig, pAig->pSeqModel ); } if ( fEnableComment ) { printf( " # File %10s. ", argv[1] ); PRT( "Time", clock() - clkTotal ); } if ( pFile != stdout ) fclose(pFile); Aig_ManStop( pAig ); exit(10); } else if ( RetValue == 1 ) { // fprintf(stdout, "s UNSATISFIABLE\n"); fprintf( pFile, "0" ); if ( fEnableComment ) { printf( " # File %10s. ", argv[1] ); PRT( "Time", clock() - clkTotal ); } printf( "\n" ); if ( pFile != stdout ) fclose(pFile); Aig_ManStop( pAig ); exit(20); } else // if ( RetValue == -1 ) { // fprintf(stdout, "s UNKNOWN\n"); fprintf( pFile, "2" ); if ( fEnableComment ) { printf( " # File %10s. ", argv[1] ); PRT( "Time", clock() - clkTotal ); } printf( "\n" ); if ( pFile != stdout ) fclose(pFile); Aig_ManStop( pAig ); exit(0); } return 0; }