abcSense.c

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

  FileName    [abcSense.c]

  SystemName  [ABC: Logic synthesis and verification system.]

  PackageName [Network and node package.]

  Synopsis    []

  Author      [Alan Mishchenko]
  
  Affiliation [UC Berkeley]

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

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

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

#include "abc.h"
#include "fraig.h"
#include "extra.h"

ABC_NAMESPACE_IMPL_START


////////////////////////////////////////////////////////////////////////
///                        DECLARATIONS                              ///
////////////////////////////////////////////////////////////////////////

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

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

  Synopsis    [Copies the topmost levels of the network.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
Abc_Obj_t * Abc_NtkSensitivityMiter_rec( Abc_Ntk_t * pNtkNew, Abc_Obj_t * pNode )
{
    assert( !Abc_ObjIsComplement(pNode) );
    if ( pNode->pCopy )
        return pNode->pCopy;
    Abc_NtkSensitivityMiter_rec( pNtkNew, Abc_ObjFanin0(pNode) );
    Abc_NtkSensitivityMiter_rec( pNtkNew, Abc_ObjFanin1(pNode) );
    return pNode->pCopy = Abc_AigAnd( (Abc_Aig_t *)pNtkNew->pManFunc, Abc_ObjChild0Copy(pNode), Abc_ObjChild1Copy(pNode) );
}

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

  Synopsis    [Creates miter for the sensitivity analysis.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
Abc_Ntk_t * Abc_NtkSensitivityMiter( Abc_Ntk_t * pNtk, int iVar )
{
    Abc_Ntk_t * pMiter;
    Vec_Ptr_t * vNodes;
    Abc_Obj_t * pObj, * pNext, * pFanin, * pOutput, * pObjNew;
    int i;
    assert( Abc_NtkIsStrash(pNtk) );
    assert( iVar < Abc_NtkCiNum(pNtk) );

    // duplicate the network
    pMiter = Abc_NtkAlloc( ABC_NTK_STRASH, ABC_FUNC_AIG, 1 );
    pMiter->pName = Extra_UtilStrsav(pNtk->pName);
    pMiter->pSpec = Extra_UtilStrsav(pNtk->pSpec);

    // assign the PIs
    Abc_NtkCleanCopy( pNtk );
    Abc_AigConst1(pNtk)->pCopy = Abc_AigConst1(pMiter);
    Abc_AigConst1(pNtk)->pData = Abc_AigConst1(pMiter);
    Abc_NtkForEachCi( pNtk, pObj, i )
    {
        pObj->pCopy = Abc_NtkCreatePi( pMiter );
        pObj->pData = pObj->pCopy;
    }
    Abc_NtkAddDummyPiNames( pMiter );

    // assign the cofactors of the CI node to be constants
    pObj = Abc_NtkCi( pNtk, iVar );
    pObj->pCopy = Abc_ObjNot( Abc_AigConst1(pMiter) ); 
    pObj->pData = Abc_AigConst1(pMiter); 

    // collect the internal nodes
    vNodes = Abc_NtkDfsReverseNodes( pNtk, &pObj, 1 );
    Vec_PtrForEachEntry( Abc_Obj_t *, vNodes, pObj, i )
    {
        for ( pNext = pObj? pObj->pCopy : pObj; pObj; pObj = pNext, pNext = pObj? pObj->pCopy : pObj )
        {
            pFanin = Abc_ObjFanin0(pObj);
            if ( !Abc_NodeIsTravIdCurrent(pFanin) )
                pFanin->pData = Abc_NtkSensitivityMiter_rec( pMiter, pFanin );
            pFanin = Abc_ObjFanin1(pObj);
            if ( !Abc_NodeIsTravIdCurrent(pFanin) )
                pFanin->pData = Abc_NtkSensitivityMiter_rec( pMiter, pFanin );
            pObj->pCopy = Abc_AigAnd( (Abc_Aig_t *)pMiter->pManFunc, Abc_ObjChild0Copy(pObj), Abc_ObjChild1Copy(pObj) );
            pObj->pData = Abc_AigAnd( (Abc_Aig_t *)pMiter->pManFunc, Abc_ObjChild0Data(pObj), Abc_ObjChild1Data(pObj) );
        }
    }
    Vec_PtrFree( vNodes );

    // update the affected COs
    pOutput = Abc_ObjNot( Abc_AigConst1(pMiter) ); 
    Abc_NtkForEachCo( pNtk, pObj, i )
    {
        if ( !Abc_NodeIsTravIdCurrent(pObj) )
            continue;
        // get the result of quantification
        if ( i == Abc_NtkCoNum(pNtk) - 1 )
        {
            pOutput = Abc_AigAnd( (Abc_Aig_t *)pMiter->pManFunc, pOutput, Abc_ObjChild0Data(pObj) );
            pOutput = Abc_AigAnd( (Abc_Aig_t *)pMiter->pManFunc, pOutput, Abc_ObjChild0Copy(pObj) );
        }
        else
        {
            pNext   = Abc_AigXor( (Abc_Aig_t *)pMiter->pManFunc, Abc_ObjChild0Copy(pObj), Abc_ObjChild0Data(pObj) );
            pOutput = Abc_AigOr( (Abc_Aig_t *)pMiter->pManFunc, pOutput, pNext );
        }
    }
    // add the PO node and name
    pObjNew = Abc_NtkCreatePo(pMiter);
    Abc_ObjAddFanin( pObjNew, pOutput );
    Abc_ObjAssignName( pObjNew, "miter", NULL );
    // make sure everything is okay
    if ( !Abc_NtkCheck( pMiter ) )
    {
        printf( "Abc_NtkSensitivityMiter: The network check has failed.\n" );
        Abc_NtkDelete( pMiter );
        return NULL;
    }
    return pMiter;
}

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

  Synopsis    [Computing sensitivity of POs to POs under constraints.]

  Description [The input network is a combinatonal AIG. The last output
  is a constraint. The procedure returns the list of number of PIs, 
  such that at least one PO depends on this PI, under the constraint.]
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
Vec_Int_t * Abc_NtkSensitivity( Abc_Ntk_t * pNtk, int nConfLim, int fVerbose )
{
    ProgressBar * pProgress;
    Prove_Params_t Params, * pParams = &Params;
    Vec_Int_t * vResult = NULL;
    Abc_Ntk_t * pMiter;
    Abc_Obj_t * pObj;
    int RetValue, i;
    assert( Abc_NtkIsStrash(pNtk) );
    assert( Abc_NtkLatchNum(pNtk) == 0 );
    // set up solving parameters
    Prove_ParamsSetDefault( pParams );
    pParams->nItersMax = 3;
    pParams->nMiteringLimitLast = nConfLim;
    // iterate through the PIs
    vResult = Vec_IntAlloc( 100 );
    pProgress = Extra_ProgressBarStart( stdout, Abc_NtkCiNum(pNtk) );
    Abc_NtkForEachCi( pNtk, pObj, i )
    {
        Extra_ProgressBarUpdate( pProgress, i, NULL );
        // generate the sensitivity miter
        pMiter = Abc_NtkSensitivityMiter( pNtk, i );
        // solve the miter using CEC engine
        RetValue = Abc_NtkIvyProve( &pMiter, pParams );
        if ( RetValue == -1 ) // undecided
            Vec_IntPush( vResult, i );
        else if ( RetValue == 0 )
        {
            int * pSimInfo = Abc_NtkVerifySimulatePattern( pMiter, pMiter->pModel );
            if ( pSimInfo[0] != 1 )
                printf( "ERROR in Abc_NtkMiterProve(): Generated counter-example is invalid.\n" );
//            else
//                printf( "Networks are NOT EQUIVALENT.\n" );
            ABC_FREE( pSimInfo );
            Vec_IntPush( vResult, i );
        }
        Abc_NtkDelete( pMiter );
    }
    Extra_ProgressBarStop( pProgress );
    if ( fVerbose )
    {
        printf( "The outputs are sensitive to %d (out of %d) inputs:\n", 
            Vec_IntSize(vResult), Abc_NtkCiNum(pNtk) );
        Vec_IntForEachEntry( vResult, RetValue, i )
            printf( "%d ", RetValue );
        printf( "\n" );
    }
    return vResult;
}

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


ABC_NAMESPACE_IMPL_END