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/**CFile****************************************************************
FileName [fraCec.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [New FRAIG package.]
Synopsis [CEC engined based on fraiging.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 30, 2007.]
Revision [$Id: fraCec.c,v 1.00 2007/06/30 00:00:00 alanmi Exp $]
***********************************************************************/
#include "fra.h"
#include "cnf.h"
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Fra_FraigSat( Aig_Man_t * pMan, sint64 nConfLimit, sint64 nInsLimit, int fVerbose )
{
sat_solver * pSat;
Cnf_Dat_t * pCnf;
int status, RetValue, clk = clock();
Vec_Int_t * vCiIds;
assert( Aig_ManPoNum(pMan) == 1 );
pMan->pData = NULL;
// derive CNF
pCnf = Cnf_Derive( pMan, 0 );
// pCnf = Cnf_DeriveSimple( pMan, 0 );
// convert into the SAT solver
pSat = Cnf_DataWriteIntoSolver( pCnf );
vCiIds = Cnf_DataCollectPiSatNums( pCnf, pMan );
Cnf_DataFree( pCnf );
// solve SAT
if ( pSat == NULL )
{
Vec_IntFree( vCiIds );
// printf( "Trivially unsat\n" );
return 1;
}
// printf( "Created SAT problem with %d variable and %d clauses. ", sat_solver_nvars(pSat), sat_solver_nclauses(pSat) );
// PRT( "Time", clock() - clk );
// simplify the problem
clk = clock();
status = sat_solver_simplify(pSat);
// printf( "Simplified the problem to %d variables and %d clauses. ", sat_solver_nvars(pSat), sat_solver_nclauses(pSat) );
// PRT( "Time", clock() - clk );
if ( status == 0 )
{
Vec_IntFree( vCiIds );
sat_solver_delete( pSat );
// printf( "The problem is UNSATISFIABLE after simplification.\n" );
return 1;
}
// solve the miter
clk = clock();
if ( fVerbose )
pSat->verbosity = 1;
status = sat_solver_solve( pSat, NULL, NULL, (sint64)nConfLimit, (sint64)nInsLimit, (sint64)0, (sint64)0 );
if ( status == l_Undef )
{
// printf( "The problem timed out.\n" );
RetValue = -1;
}
else if ( status == l_True )
{
// printf( "The problem is SATISFIABLE.\n" );
RetValue = 0;
}
else if ( status == l_False )
{
// printf( "The problem is UNSATISFIABLE.\n" );
RetValue = 1;
}
else
assert( 0 );
// PRT( "SAT sat_solver time", clock() - clk );
// printf( "The number of conflicts = %d.\n", (int)pSat->sat_solver_stats.conflicts );
// if the problem is SAT, get the counterexample
if ( status == l_True )
{
pMan->pData = Sat_SolverGetModel( pSat, vCiIds->pArray, vCiIds->nSize );
}
// free the sat_solver
if ( fVerbose )
Sat_SolverPrintStats( stdout, pSat );
//sat_solver_store_write( pSat, "trace.cnf" );
//sat_solver_store_free( pSat );
sat_solver_delete( pSat );
Vec_IntFree( vCiIds );
return RetValue;
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Fra_FraigCec( Aig_Man_t ** ppAig, int fVerbose )
{
int nBTLimitStart = 300; // starting SAT run
int nBTLimitFirst = 2; // first fraiging iteration
int nBTLimitLast = 1000000; // the last-gasp SAT run
Fra_Par_t Params, * pParams = &Params;
Aig_Man_t * pAig = *ppAig, * pTemp;
int i, RetValue, clk;
// report the original miter
if ( fVerbose )
{
printf( "Original miter: Nodes = %6d.\n", Aig_ManNodeNum(pAig) );
}
RetValue = Fra_FraigMiterStatus( pAig );
// assert( RetValue == -1 );
if ( RetValue >= 0 )
return RetValue;
// if SAT only, solve without iteration
clk = clock();
RetValue = Fra_FraigSat( pAig, (sint64)2*nBTLimitStart, (sint64)0, 0 );
if ( fVerbose )
{
printf( "Initial SAT: Nodes = %6d. ", Aig_ManNodeNum(pAig) );
PRT( "Time", clock() - clk );
}
if ( RetValue >= 0 )
return RetValue;
// duplicate the AIG
clk = clock();
// pAig = Aig_ManDup( pTemp = pAig );
pAig = Dar_ManRwsat( pTemp = pAig, 0, 0 );
Aig_ManStop( pTemp );
if ( fVerbose )
{
printf( "Rewriting: Nodes = %6d. ", Aig_ManNodeNum(pAig) );
PRT( "Time", clock() - clk );
}
// perform the loop
Fra_ParamsDefault( pParams );
pParams->nBTLimitNode = nBTLimitFirst;
pParams->nBTLimitMiter = nBTLimitStart;
pParams->fDontShowBar = 1;
pParams->fProve = 1;
for ( i = 0; i < 6; i++ )
{
//printf( "Running fraiging with %d BTnode and %d BTmiter.\n", pParams->nBTLimitNode, pParams->nBTLimitMiter );
// run fraiging
clk = clock();
pAig = Fra_FraigPerform( pTemp = pAig, pParams );
Aig_ManStop( pTemp );
if ( fVerbose )
{
printf( "Fraiging (i=%d): Nodes = %6d. ", i+1, Aig_ManNodeNum(pAig) );
PRT( "Time", clock() - clk );
}
// check the miter status
RetValue = Fra_FraigMiterStatus( pAig );
if ( RetValue >= 0 )
break;
// perform rewriting
clk = clock();
pAig = Dar_ManRewriteDefault( pTemp = pAig );
Aig_ManStop( pTemp );
if ( fVerbose )
{
printf( "Rewriting: Nodes = %6d. ", Aig_ManNodeNum(pAig) );
PRT( "Time", clock() - clk );
}
// check the miter status
RetValue = Fra_FraigMiterStatus( pAig );
if ( RetValue >= 0 )
break;
// try simulation
// set the parameters for the next run
pParams->nBTLimitNode = 8 * pParams->nBTLimitNode;
pParams->nBTLimitMiter = 2 * pParams->nBTLimitMiter;
}
// if still unsolved try last gasp
if ( RetValue == -1 )
{
clk = clock();
RetValue = Fra_FraigSat( pAig, (sint64)nBTLimitLast, (sint64)0, 0 );
if ( fVerbose )
{
printf( "Final SAT: Nodes = %6d. ", Aig_ManNodeNum(pAig) );
PRT( "Time", clock() - clk );
}
}
*ppAig = pAig;
return RetValue;
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Fra_FraigCecPartitioned( Aig_Man_t * pMan1, Aig_Man_t * pMan2, int fVerbose )
{
Aig_Man_t * pAig;
Vec_Ptr_t * vParts;
int i, RetValue = 1, nOutputs;
// create partitions
vParts = Aig_ManMiterPartitioned( pMan1, pMan2, 100 );
// solve the partitions
nOutputs = -1;
Vec_PtrForEachEntry( vParts, pAig, i )
{
nOutputs++;
if ( fVerbose )
printf( "Verifying part %4d (out of %4d) PI = %5d. PO = %5d. And = %6d. Lev = %4d.\r",
i+1, Vec_PtrSize(vParts), Aig_ManPiNum(pAig), Aig_ManPoNum(pAig),
Aig_ManNodeNum(pAig), Aig_ManLevelNum(pAig) );
RetValue = Fra_FraigMiterStatus( pAig );
if ( RetValue == 1 )
continue;
if ( RetValue == 0 )
break;
RetValue = Fra_FraigCec( &pAig, 0 );
Vec_PtrWriteEntry( vParts, i, pAig );
if ( RetValue == 1 )
continue;
if ( RetValue == 0 )
break;
break;
}
// clear the result
if ( fVerbose )
{
printf( " \r" );
fflush( stdout );
}
// report the timeout
if ( RetValue == -1 )
{
printf( "Timed out after verifying %d partitions (out of %d).\n", nOutputs, Vec_PtrSize(vParts) );
fflush( stdout );
}
// free intermediate results
Vec_PtrForEachEntry( vParts, pAig, i )
Aig_ManStop( pAig );
Vec_PtrFree( vParts );
return RetValue;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
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