/**CFile****************************************************************

  FileName    [abcVerify.c]

  SystemName  [ABC: Logic synthesis and verification system.]

  PackageName [Network and node package.]

  Synopsis    [Combinational and sequential verification for two networks.]

  Author      [Alan Mishchenko]
  
  Affiliation [UC Berkeley]

  Date        [Ver. 1.0. Started - June 20, 2005.]

  Revision    [$Id: abcVerify.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]

***********************************************************************/

#include "abc.h"
#include "fraig.h"
#include "sim.h"

////////////////////////////////////////////////////////////////////////
///                        DECLARATIONS                              ///
////////////////////////////////////////////////////////////////////////
 
static void  Abc_NtkVerifyReportError( Abc_Ntk_t * pNtk1, Abc_Ntk_t * pNtk2, int * pModel );
static void  Abc_NtkVerifyReportErrorSeq( Abc_Ntk_t * pNtk1, Abc_Ntk_t * pNtk2, int * pModel, int nFrames );

////////////////////////////////////////////////////////////////////////
///                     FUNCTION DEFINITIONS                         ///
////////////////////////////////////////////////////////////////////////

/**Function*************************************************************

  Synopsis    [Verifies combinational equivalence by brute-force SAT.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
void Abc_NtkCecSat( Abc_Ntk_t * pNtk1, Abc_Ntk_t * pNtk2, int nConfLimit, int nImpLimit )
{
    Abc_Ntk_t * pMiter;
    Abc_Ntk_t * pCnf;
    int RetValue;

    // get the miter of the two networks
    pMiter = Abc_NtkMiter( pNtk1, pNtk2, 1 );
    if ( pMiter == NULL )
    {
        printf( "Miter computation has failed.\n" );
        return;
    }
    RetValue = Abc_NtkMiterIsConstant( pMiter );
    if ( RetValue == 0 )
    {
        printf( "Networks are NOT EQUIVALENT after structural hashing.\n" );
        // report the error
        pMiter->pModel = Abc_NtkVerifyGetCleanModel( pMiter, 1 );
        Abc_NtkVerifyReportError( pNtk1, pNtk2, pMiter->pModel );
        FREE( pMiter->pModel );
        Abc_NtkDelete( pMiter );
        return;
    }
    if ( RetValue == 1 )
    {
        Abc_NtkDelete( pMiter );
        printf( "Networks are equivalent after structural hashing.\n" );
        return;
    }

    // convert the miter into a CNF
    pCnf = Abc_NtkRenode( pMiter, 0, 100, 1, 0, 0, 0 );
    Abc_NtkDelete( pMiter );
    if ( pCnf == NULL )
    {
        printf( "Renoding for CNF has failed.\n" );
        return;
    }

    // solve the CNF using the SAT solver
    RetValue = Abc_NtkMiterSat( pCnf, nConfLimit, nImpLimit, 0 );
    if ( RetValue == -1 )
        printf( "Networks are undecided (SAT solver timed out).\n" );
    else if ( RetValue == 0 )
        printf( "Networks are NOT EQUIVALENT after SAT.\n" );
    else
        printf( "Networks are equivalent after SAT.\n" );
    if ( pCnf->pModel )
        Abc_NtkVerifyReportError( pNtk1, pNtk2, pCnf->pModel );
    FREE( pCnf->pModel );
    Abc_NtkDelete( pCnf );
}


/**Function*************************************************************

  Synopsis    [Verifies sequential equivalence by fraiging followed by SAT.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
void Abc_NtkCecFraig( Abc_Ntk_t * pNtk1, Abc_Ntk_t * pNtk2, int nSeconds, int fVerbose )
{
    Fraig_Params_t Params;
    Fraig_Man_t * pMan;
    Abc_Ntk_t * pMiter;
    int RetValue;

    // get the miter of the two networks
    pMiter = Abc_NtkMiter( pNtk1, pNtk2, 1 );
    if ( pMiter == NULL )
    {
        printf( "Miter computation has failed.\n" );
        return;
    }
    RetValue = Abc_NtkMiterIsConstant( pMiter );
    if ( RetValue == 0 )
    {
        printf( "Networks are NOT EQUIVALENT after structural hashing.\n" );
        // report the error
        pMiter->pModel = Abc_NtkVerifyGetCleanModel( pMiter, 1 );
        Abc_NtkVerifyReportError( pNtk1, pNtk2, pMiter->pModel );
        FREE( pMiter->pModel );
        Abc_NtkDelete( pMiter );
        return;
    }
    if ( RetValue == 1 )
    {
        printf( "Networks are equivalent after structural hashing.\n" );
        Abc_NtkDelete( pMiter );
        return;
    }

    // convert the miter into a FRAIG
    Fraig_ParamsSetDefault( &Params );
    Params.fVerbose = fVerbose;
    Params.nSeconds = nSeconds;
//    Params.fFuncRed = 0;
//    Params.nPatsRand = 0;
//    Params.nPatsDyna = 0;
    pMan = Abc_NtkToFraig( pMiter, &Params, 0, 0 ); 
    Fraig_ManProveMiter( pMan );

    // analyze the result
    RetValue = Fraig_ManCheckMiter( pMan );
    // report the result
    if ( RetValue == -1 )
        printf( "Networks are undecided (SAT solver timed out on the final miter).\n" );
    else if ( RetValue == 1 )
        printf( "Networks are equivalent after fraiging.\n" );
    else if ( RetValue == 0 )
    {
        printf( "Networks are NOT EQUIVALENT after fraiging.\n" );
        Abc_NtkVerifyReportError( pNtk1, pNtk2, Fraig_ManReadModel(pMan) );
    }
    else assert( 0 );
    // delete the fraig manager
    Fraig_ManFree( pMan );
    // delete the miter
    Abc_NtkDelete( pMiter );
}

/**Function*************************************************************

  Synopsis    [Verifies sequential equivalence by brute-force SAT.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
void Abc_NtkSecSat( Abc_Ntk_t * pNtk1, Abc_Ntk_t * pNtk2, int nConfLimit, int nImpLimit, int nFrames )
{
    Abc_Ntk_t * pMiter;
    Abc_Ntk_t * pFrames;
    Abc_Ntk_t * pCnf;
    int RetValue;

    // get the miter of the two networks
    pMiter = Abc_NtkMiter( pNtk1, pNtk2, 0 );
    if ( pMiter == NULL )
    {
        printf( "Miter computation has failed.\n" );
        return;
    }
    RetValue = Abc_NtkMiterIsConstant( pMiter );
    if ( RetValue == 0 )
    {
        Abc_NtkDelete( pMiter );
        printf( "Networks are NOT EQUIVALENT after structural hashing.\n" );
        return;
    }
    if ( RetValue == 1 )
    {
        Abc_NtkDelete( pMiter );
        printf( "Networks are equivalent after structural hashing.\n" );
        return;
    }

    // create the timeframes
    pFrames = Abc_NtkFrames( pMiter, nFrames, 1 );
    Abc_NtkDelete( pMiter );
    if ( pFrames == NULL )
    {
        printf( "Frames computation has failed.\n" );
        return;
    }
    RetValue = Abc_NtkMiterIsConstant( pFrames );
    if ( RetValue == 0 )
    {
        Abc_NtkDelete( pFrames );
        printf( "Networks are NOT EQUIVALENT after framing.\n" );
        return;
    }
    if ( RetValue == 1 )
    {
        Abc_NtkDelete( pFrames );
        printf( "Networks are equivalent after framing.\n" );
        return;
    }

    // convert the miter into a CNF
    pCnf = Abc_NtkRenode( pFrames, 0, 100, 1, 0, 0, 0 );
    Abc_NtkDelete( pFrames );
    if ( pCnf == NULL )
    {
        printf( "Renoding for CNF has failed.\n" );
        return;
    }

    // solve the CNF using the SAT solver
    RetValue = Abc_NtkMiterSat( pCnf, nConfLimit, nImpLimit, 0 );
    if ( RetValue == -1 )
        printf( "Networks are undecided (SAT solver timed out).\n" );
    else if ( RetValue == 0 )
        printf( "Networks are NOT EQUIVALENT after SAT.\n" );
    else
        printf( "Networks are equivalent after SAT.\n" );
    Abc_NtkDelete( pCnf );
}

/**Function*************************************************************

  Synopsis    [Verifies combinational equivalence by fraiging followed by SAT]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
void Abc_NtkSecFraig( Abc_Ntk_t * pNtk1, Abc_Ntk_t * pNtk2, int nSeconds, int nFrames, int fVerbose )
{
    Fraig_Params_t Params;
    Fraig_Man_t * pMan;
    Abc_Ntk_t * pMiter;
    Abc_Ntk_t * pFrames;
    int RetValue;

    // get the miter of the two networks
    pMiter = Abc_NtkMiter( pNtk1, pNtk2, 0 );
    if ( pMiter == NULL )
    {
        printf( "Miter computation has failed.\n" );
        return;
    }
    RetValue = Abc_NtkMiterIsConstant( pMiter );
    if ( RetValue == 0 )
    {
        printf( "Networks are NOT EQUIVALENT after structural hashing.\n" );
        // report the error
        pMiter->pModel = Abc_NtkVerifyGetCleanModel( pMiter, nFrames );
        Abc_NtkVerifyReportErrorSeq( pNtk1, pNtk2, pMiter->pModel, nFrames );
        FREE( pMiter->pModel );
        Abc_NtkDelete( pMiter );
        return;
    }
    if ( RetValue == 1 )
    {
        Abc_NtkDelete( pMiter );
        printf( "Networks are equivalent after structural hashing.\n" );
        return;
    }

    // create the timeframes
    pFrames = Abc_NtkFrames( pMiter, nFrames, 1 );
    Abc_NtkDelete( pMiter );
    if ( pFrames == NULL )
    {
        printf( "Frames computation has failed.\n" );
        return;
    }
    RetValue = Abc_NtkMiterIsConstant( pFrames );
    if ( RetValue == 0 )
    {
        printf( "Networks are NOT EQUIVALENT after framing.\n" );
        // report the error
        pFrames->pModel = Abc_NtkVerifyGetCleanModel( pFrames, 1 );
        Abc_NtkVerifyReportErrorSeq( pNtk1, pNtk2, pFrames->pModel, nFrames );
        FREE( pFrames->pModel );
        Abc_NtkDelete( pFrames );
        return;
    }
    if ( RetValue == 1 )
    {
        Abc_NtkDelete( pFrames );
        printf( "Networks are equivalent after framing.\n" );
        return;
    }

    // convert the miter into a FRAIG
    Fraig_ParamsSetDefault( &Params );
    Params.fVerbose = fVerbose;
    Params.nSeconds = nSeconds;
//    Params.fFuncRed = 0;
//    Params.nPatsRand = 0;
//    Params.nPatsDyna = 0;
    pMan = Abc_NtkToFraig( pFrames, &Params, 0, 0 ); 
    Fraig_ManProveMiter( pMan );

    // analyze the result
    RetValue = Fraig_ManCheckMiter( pMan );
    // report the result
    if ( RetValue == -1 )
        printf( "Networks are undecided (SAT solver timed out on the final miter).\n" );
    else if ( RetValue == 1 )
        printf( "Networks are equivalent after fraiging.\n" );
    else if ( RetValue == 0 )
    {
        printf( "Networks are NOT EQUIVALENT after fraiging.\n" );
        Abc_NtkVerifyReportErrorSeq( pNtk1, pNtk2, Fraig_ManReadModel(pMan), nFrames );
    }
    else assert( 0 );
    // delete the fraig manager
    Fraig_ManFree( pMan );
    // delete the miter
    Abc_NtkDelete( pFrames );
}

/**Function*************************************************************

  Synopsis    [Returns a dummy pattern full of zeros.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
int * Abc_NtkVerifyGetCleanModel( Abc_Ntk_t * pNtk, int nFrames )
{
    int * pModel = ALLOC( int, Abc_NtkCiNum(pNtk) * nFrames );
    memset( pModel, 0, sizeof(int) * Abc_NtkCiNum(pNtk) * nFrames );
    return pModel;
}

/**Function*************************************************************

  Synopsis    [Returns the PO values under the given input pattern.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
int * Abc_NtkVerifySimulatePattern( Abc_Ntk_t * pNtk, int * pModel )
{
    Vec_Ptr_t * vNodes;
    Abc_Obj_t * pNode;
    int * pValues, Value0, Value1, i;
    int fStrashed = 0;
    if ( !Abc_NtkIsStrash(pNtk) )
    {
        pNtk = Abc_NtkStrash(pNtk, 0, 0);
        fStrashed = 1;
    }
    // increment the trav ID
    Abc_NtkIncrementTravId( pNtk );
    // set the CI values
    Abc_NtkForEachCi( pNtk, pNode, i )
        pNode->pCopy = (void *)pModel[i];
    // simulate in the topological order
    vNodes = Abc_NtkDfs( pNtk, 1 );
    Vec_PtrForEachEntry( vNodes, pNode, i )
    {
        if ( Abc_NodeIsConst(pNode) )
            pNode->pCopy = NULL;
        else
        {
            Value0 = ((int)Abc_ObjFanin0(pNode)->pCopy) ^ Abc_ObjFaninC0(pNode);
            Value1 = ((int)Abc_ObjFanin1(pNode)->pCopy) ^ Abc_ObjFaninC1(pNode);
            pNode->pCopy = (void *)(Value0 & Value1);
        }
    }
    Vec_PtrFree( vNodes );
    // fill the output values
    pValues = ALLOC( int, Abc_NtkCoNum(pNtk) );
    Abc_NtkForEachCo( pNtk, pNode, i )
        pValues[i] = ((int)Abc_ObjFanin0(pNode)->pCopy) ^ Abc_ObjFaninC0(pNode);
    if ( fStrashed )
        Abc_NtkDelete( pNtk );
    return pValues;
}


/**Function*************************************************************

  Synopsis    [Reports mismatch between the two networks.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
void Abc_NtkVerifyReportError( Abc_Ntk_t * pNtk1, Abc_Ntk_t * pNtk2, int * pModel )
{
    Vec_Ptr_t * vNodes;
    Abc_Obj_t * pNode;
    int * pValues1, * pValues2;
    int nErrors, nPrinted, i, iNode = -1;

    assert( Abc_NtkCiNum(pNtk1) == Abc_NtkCiNum(pNtk2) );
    assert( Abc_NtkCoNum(pNtk1) == Abc_NtkCoNum(pNtk2) );
    // get the CO values under this model
    pValues1 = Abc_NtkVerifySimulatePattern( pNtk1, pModel );
    pValues2 = Abc_NtkVerifySimulatePattern( pNtk2, pModel );
    // count the mismatches
    nErrors = 0;
    for ( i = 0; i < Abc_NtkCoNum(pNtk1); i++ )
        nErrors += (int)( pValues1[i] != pValues2[i] );
    printf( "Verification failed for %d outputs: ", nErrors );
    // print the first 3 outputs
    nPrinted = 0;
    for ( i = 0; i < Abc_NtkCoNum(pNtk1); i++ )
        if ( pValues1[i] != pValues2[i] )
        {
            if ( iNode == -1 )
                iNode = i;
            printf( " %s", Abc_ObjName(Abc_NtkCo(pNtk1,i)) );
            if ( ++nPrinted == 3 )
                break;
        }
    if ( nPrinted != nErrors )
        printf( " ..." );
    printf( "\n" );
    // report mismatch for the first output
    if ( iNode >= 0 )
    {
        printf( "Output %s: Value in Network1 = %d. Value in Network2 = %d.\n", 
            Abc_ObjName(Abc_NtkCo(pNtk1,iNode)), pValues1[iNode], pValues2[iNode] );
        printf( "Input pattern: " );
        // collect PIs in the cone
        pNode = Abc_NtkCo(pNtk1,iNode);
        vNodes = Abc_NtkNodeSupport( pNtk1, &pNode, 1 );
        // set the PI numbers
        Abc_NtkForEachCi( pNtk1, pNode, i )
            pNode->pCopy = (void*)i;
        // print the model
        Vec_PtrForEachEntry( vNodes, pNode, i )
        {
            assert( Abc_ObjIsCi(pNode) );
            printf( " %s=%d", Abc_ObjName(pNode), pModel[(int)pNode->pCopy] );
        }
        printf( "\n" );
        Vec_PtrFree( vNodes );
    }
    free( pValues1 );
    free( pValues2 );
}


/**Function*************************************************************

  Synopsis    [Computes the COs in the support of the PO in the given frame.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
void Abc_NtkGetSeqPoSupp( Abc_Ntk_t * pNtk, int iFrame, int iNumPo )
{
    Abc_Ntk_t * pFrames;
    Abc_Obj_t * pObj, * pNodePo;
    Vec_Ptr_t * vSupp;
    int i, k;
    // get the timeframes of the network
    pFrames = Abc_NtkFrames( pNtk, iFrame + 1, 0 );
//Abc_NtkShowAig( pFrames );

    // get the PO of the timeframes
    pNodePo = Abc_NtkPo( pFrames, iFrame * Abc_NtkPoNum(pNtk) + iNumPo );
    // set the support
    vSupp   = Abc_NtkNodeSupport( pFrames, &pNodePo, 1 );
    // mark the support of the frames
    Abc_NtkForEachCi( pFrames, pObj, i )
        pObj->pCopy = NULL;
    Vec_PtrForEachEntry( vSupp, pObj, i )
        pObj->pCopy = (void *)1;
    // mark the support of the network if the support of the timeframes is marked
    Abc_NtkForEachCi( pNtk, pObj, i )
        pObj->pCopy = NULL;
    Abc_NtkForEachLatch( pNtk, pObj, i )
        if ( Abc_NtkLatch(pFrames, i)->pCopy )
            pObj->pCopy = (void *)1;
    Abc_NtkForEachPi( pNtk, pObj, i )
        for ( k = 0; k <= iFrame; k++ )
            if ( Abc_NtkPi(pFrames, k*Abc_NtkPiNum(pNtk) + i)->pCopy )
                pObj->pCopy = (void *)1;
    // free stuff
    Vec_PtrFree( vSupp );
    Abc_NtkDelete( pFrames );
}

/**Function*************************************************************

  Synopsis    [Reports mismatch between the two sequential networks.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
void Abc_NtkVerifyReportErrorSeq( Abc_Ntk_t * pNtk1, Abc_Ntk_t * pNtk2, int * pModel, int nFrames )
{
    Vec_Ptr_t * vInfo1, * vInfo2;
    Abc_Obj_t * pObj, * pObjError, * pObj1, * pObj2;
    int ValueError1, ValueError2;
    unsigned * pPats1, * pPats2;
    int i, o, k, nErrors, iFrameError, iNodePo, nPrinted;
    int fRemove1 = 0, fRemove2 = 0;

    if ( !Abc_NtkIsStrash(pNtk1) )
        fRemove1 = 1, pNtk1 = Abc_NtkStrash( pNtk1, 0, 0 );
    if ( !Abc_NtkIsStrash(pNtk2) )
        fRemove2 = 1, pNtk2 = Abc_NtkStrash( pNtk2, 0, 0 );

    // simulate sequential circuits
    vInfo1 = Sim_SimulateSeqModel( pNtk1, nFrames, pModel );
    vInfo2 = Sim_SimulateSeqModel( pNtk2, nFrames, pModel );

    // look for a discrepancy in the PO values
    nErrors = 0;
    pObjError = NULL;
    for ( i = 0; i < nFrames; i++ )
    {
        if ( pObjError )
            break;
        Abc_NtkForEachPo( pNtk1, pObj1, o )
        {
            pObj2  = Abc_NtkPo( pNtk2, o );
            pPats1 = Sim_SimInfoGet(vInfo1, pObj1);
            pPats2 = Sim_SimInfoGet(vInfo2, pObj2);
            if ( pPats1[i] == pPats2[i] )
                continue;
            nErrors++;
            if ( pObjError == NULL )
            {
                pObjError   = pObj1;
                iFrameError = i;
                iNodePo     = o;
                ValueError1 = (pPats1[i] > 0);
                ValueError2 = (pPats2[i] > 0);
            }
        }
    }

    if ( pObjError == NULL )
    {
        printf( "No output mismatches detected.\n" );
        Sim_UtilInfoFree( vInfo1 );
        Sim_UtilInfoFree( vInfo2 );
        if ( fRemove1 ) Abc_NtkDelete( pNtk1 );
        if ( fRemove2 ) Abc_NtkDelete( pNtk2 );
        return;
    }

    printf( "Verification failed for %d output%s of frame %d: ", nErrors, (nErrors>1? "s":""), iFrameError+1 );
    // print the first 3 outputs
    nPrinted = 0;
    Abc_NtkForEachPo( pNtk1, pObj1, o )
    {
        pObj2 = Abc_NtkPo( pNtk2, o );
        pPats1 = Sim_SimInfoGet(vInfo1, pObj1);
        pPats2 = Sim_SimInfoGet(vInfo2, pObj2);
        if ( pPats1[iFrameError] == pPats2[iFrameError] )
            continue;
        printf( " %s", Abc_ObjName(pObj1) );
        if ( ++nPrinted == 3 )
            break;
    }
    if ( nPrinted != nErrors )
        printf( " ..." );
    printf( "\n" );

    // mark CIs of the networks in the cone of influence of this output
    Abc_NtkGetSeqPoSupp( pNtk1, iFrameError, iNodePo );
    Abc_NtkGetSeqPoSupp( pNtk2, iFrameError, iNodePo );

    // report mismatch for the first output
    printf( "Output %s: Value in Network1 = %d. Value in Network2 = %d.\n", 
        Abc_ObjName(pObjError), ValueError1, ValueError2 );

    printf( "The cone of influence of output %s in Network1:\n", Abc_ObjName(pObjError) );
    printf( "PIs: " );
    Abc_NtkForEachPi( pNtk1, pObj, i )
        if ( pObj->pCopy )
            printf( "%s ", Abc_ObjName(pObj) );
    printf( "\n" );
    printf( "Latches: " );
    Abc_NtkForEachLatch( pNtk1, pObj, i )
        if ( pObj->pCopy )
            printf( "%s ", Abc_ObjName(pObj) );
    printf( "\n" );

    printf( "The cone of influence of output %s in Network2:\n", Abc_ObjName(pObjError) );
    printf( "PIs: " );
    Abc_NtkForEachPi( pNtk2, pObj, i )
        if ( pObj->pCopy )
            printf( "%s ", Abc_ObjName(pObj) );
    printf( "\n" );
    printf( "Latches: " );
    Abc_NtkForEachLatch( pNtk2, pObj, i )
        if ( pObj->pCopy )
            printf( "%s ", Abc_ObjName(pObj) );
    printf( "\n" );

    // print the patterns
    for ( i = 0; i <= iFrameError; i++ )
    {
        printf( "Frame %d:  ", i+1 );

        printf( "PI(1):" );
        Abc_NtkForEachPi( pNtk1, pObj, k )
            if ( pObj->pCopy )
                printf( "%d", Sim_SimInfoGet(vInfo1, pObj)[i] > 0 );
        printf( " " );
        printf( "L(1):" );
        Abc_NtkForEachLatch( pNtk1, pObj, k )
            if ( pObj->pCopy )
                printf( "%d", Sim_SimInfoGet(vInfo1, pObj)[i] > 0 );
        printf( " " );
        printf( "%s(1):", Abc_ObjName(pObjError) );
        printf( "%d", Sim_SimInfoGet(vInfo1, pObjError)[i] > 0 );

        printf( "  " );

        printf( "PI(2):" );
        Abc_NtkForEachPi( pNtk2, pObj, k )
            if ( pObj->pCopy )
                printf( "%d", Sim_SimInfoGet(vInfo2, pObj)[i] > 0 );
        printf( " " );
        printf( "L(2):" );
        Abc_NtkForEachLatch( pNtk2, pObj, k )
            if ( pObj->pCopy )
                printf( "%d", Sim_SimInfoGet(vInfo2, pObj)[i] > 0 );
        printf( " " );
        printf( "%s(2):", Abc_ObjName(pObjError) );
        printf( "%d", Sim_SimInfoGet(vInfo2, pObjError)[i] > 0 );

        printf( "\n" );
    }
    Abc_NtkForEachCi( pNtk1, pObj, i )
        pObj->pCopy = NULL;
    Abc_NtkForEachCi( pNtk2, pObj, i )
        pObj->pCopy = NULL;

    Sim_UtilInfoFree( vInfo1 );
    Sim_UtilInfoFree( vInfo2 );
    if ( fRemove1 ) Abc_NtkDelete( pNtk1 );
    if ( fRemove2 ) Abc_NtkDelete( pNtk2 );
}


////////////////////////////////////////////////////////////////////////
///                       END OF FILE                                ///
////////////////////////////////////////////////////////////////////////