Removing some old useless code.

4 files changed, 2 insertions, 515 deletions

diff --git a/src/base/abci/abc.c b/src/base/abci/abc.c
index 74525e26..00552286 100644
--- a/src/base/abci/abc.c
+++ b/src/base/abci/abc.c
@@ -15378,7 +15378,7 @@ int Abc_CommandIf( Abc_Frame_t * pAbc, int argc, char ** argv )
 
     fLutMux = 0;
     Extra_UtilGetoptReset();
-    while ( ( c = Extra_UtilGetopt( argc, argv, "KCFAGNDEWSqaflepmrsdbugyojikcnvh" ) ) != EOF )
+    while ( ( c = Extra_UtilGetopt( argc, argv, "KCFAGNDEWSqaflepmrsdbugyojiknvh" ) ) != EOF )
     {
         switch ( c )
         {
@@ -15551,9 +15551,6 @@ int Abc_CommandIf( Abc_Frame_t * pAbc, int argc, char ** argv )
         case 'k':
             pPars->fEnableCheck10 ^= 1;
             break;
-        case 'c':
-            pPars->fEnableRealPos ^= 1;
-            break;
         case 'n':
             pPars->fUseDsd ^= 1;
             break;
@@ -15847,7 +15844,6 @@ usage:
     Abc_Print( -2, "\t-j       : toggles enabling additional check [default = %s]\n", pPars->fEnableCheck07? "yes": "no" );
     Abc_Print( -2, "\t-i       : toggles enabling additional check [default = %s]\n", pPars->fEnableCheck08? "yes": "no" );
     Abc_Print( -2, "\t-k       : toggles enabling additional check [default = %s]\n", pPars->fEnableCheck10? "yes": "no" );
-    Abc_Print( -2, "\t-c       : toggles enabling additional feature [default = %s]\n", pPars->fEnableRealPos? "yes": "no" );
     Abc_Print( -2, "\t-n       : toggles computing DSDs of the cut functions [default = %s]\n", pPars->fUseDsd? "yes": "no" );
     Abc_Print( -2, "\t-v       : toggles verbose output [default = %s]\n", pPars->fVerbose? "yes": "no" );
     Abc_Print( -2, "\t-h       : prints the command usage\n");
@@ -29225,7 +29221,7 @@ int Abc_CommandAbc9If( Abc_Frame_t * pAbc, int argc, char ** argv )
     }
     pPars->pLutLib = (If_LibLut_t *)pAbc->pLibLut;
     Extra_UtilGetoptReset();
-    while ( ( c = Extra_UtilGetopt( argc, argv, "KCFAGDEWSqalepmrsdbgyojikfuczvh" ) ) != EOF )
+    while ( ( c = Extra_UtilGetopt( argc, argv, "KCFAGDEWSqalepmrsdbgyojikfuzvh" ) ) != EOF )
     {
         switch ( c )
         {
@@ -29387,9 +29383,6 @@ int Abc_CommandAbc9If( Abc_Frame_t * pAbc, int argc, char ** argv )
         case 'u':
             pPars->fEnableCheck75u ^= 1;
             break;
-        case 'c':
-            pPars->fEnableRealPos ^= 1;
-            break;
         case 'z':
             pPars->fDeriveLuts ^= 1;
             break;
@@ -29616,7 +29609,6 @@ usage:
     Abc_Print( -2, "\t-k       : toggles enabling additional check [default = %s]\n", pPars->fEnableCheck10? "yes": "no" );
     Abc_Print( -2, "\t-f       : toggles enabling additional check [default = %s]\n", pPars->fEnableCheck75? "yes": "no" );
     Abc_Print( -2, "\t-u       : toggles enabling additional check [default = %s]\n", pPars->fEnableCheck75u? "yes": "no" );
-    Abc_Print( -2, "\t-c       : toggles enabling additional feature [default = %s]\n", pPars->fEnableRealPos? "yes": "no" );
     Abc_Print( -2, "\t-z       : toggles deriving LUTs when mapping into LUT structures [default = %s]\n", pPars->fDeriveLuts? "yes": "no" );
     Abc_Print( -2, "\t-v       : toggles verbose output [default = %s]\n", pPars->fVerbose? "yes": "no" );
     Abc_Print( -2, "\t-h       : prints the command usage\n");
diff --git a/src/base/abci/abcIf.c b/src/base/abci/abcIf.c
index 82b45248..5ef2afb8 100644
--- a/src/base/abci/abcIf.c
+++ b/src/base/abci/abcIf.c
@@ -39,11 +39,6 @@ static Vec_Ptr_t * Abc_NtkFindGoodOrder( Abc_Ntk_t * pNtk );
 
 extern void Abc_NtkBddReorder( Abc_Ntk_t * pNtk, int fVerbose );
 extern void Abc_NtkBidecResyn( Abc_Ntk_t * pNtk, int fVerbose );
-
-extern void Abc_NtkCollectPoDrivers( If_Man_t * p, Abc_Ntk_t * pNtk );
-extern void Abc_NtkCreateChoiceDrivers( If_Man_t * p );
-extern void Abc_NtkFreePoDrivers( If_Man_t * p, Abc_Ntk_t * pNtk );
-extern void Abc_NtkRecreatePoDrivers( If_Man_t * p, Abc_Ntk_t * pNtkNew );
  
 ////////////////////////////////////////////////////////////////////////
 ///                     FUNCTION DEFINITIONS                         ///
@@ -141,16 +136,11 @@ Abc_Ntk_t * Abc_NtkIf( Abc_Ntk_t * pNtk, If_Par_t * pPars )
         Abc_NtkIfComputeSwitching( pNtk, pIfMan );
 
     // perform FPGA mapping
-    if ( pPars->fEnableRealPos )
-        Abc_NtkCollectPoDrivers( pIfMan, pNtk );
-    Abc_NtkCreateChoiceDrivers( pIfMan );
     if ( !If_ManPerformMapping( pIfMan ) )
     {
-        Abc_NtkFreePoDrivers( pIfMan, pNtk );
         If_ManStop( pIfMan );
         return NULL;
     }
-    Abc_NtkFreePoDrivers( pIfMan, pNtk );
 
     // transform the result of mapping into the new network
     pNtkNew = Abc_NtkFromIf( pIfMan, pNtk );
@@ -322,10 +312,6 @@ Abc_Ntk_t * Abc_NtkFromIf( If_Man_t * pIfMan, Abc_Ntk_t * pNtk )
     Extra_ProgressBarStop( pProgress );
     Vec_IntFree( vCover );
 
-    // update PO drivers
-    if ( pIfMan->pPars->fEnableRealPos )
-        Abc_NtkRecreatePoDrivers( pIfMan, pNtkNew );
-
     // remove the constant node if not used
     pNodeNew = (Abc_Obj_t *)If_ObjCopy( If_ManConst1(pIfMan) );
     if ( Abc_ObjFanoutNum(pNodeNew) == 0 && !Abc_ObjIsNone(pNodeNew) )
@@ -519,15 +505,6 @@ Abc_Obj_t * Abc_NodeFromIf_rec( Abc_Ntk_t * pNtkNew, If_Man_t * pIfMan, If_Obj_t
         pNodeNew->pData = Abc_NodeIfToHop( (Hop_Man_t *)pNtkNew->pManFunc, pIfMan, pIfObj );
     }
     If_ObjSetCopy( pIfObj, pNodeNew );
-/*
-printf( "%3d : Delay = %d  Cutsize = %d\n", pNodeNew->Id, (int)pCutBest->Delay, pCutBest->nLeaves );
-{
-    Abc_Obj_t * pFanin;
-    int i;
-Abc_ObjForEachFanin( pNodeNew, pFanin, i )
-printf( "fanin%d = %2d\n", i, pFanin->Id );
-}
-*/
     return pNodeNew;
 }
 
@@ -642,7 +619,6 @@ Hop_Obj_t * Abc_NodeIfToHop( Hop_Man_t * pHopMan, If_Man_t * pIfMan, If_Obj_t *
         printf( "Abc_NodeIfToHop(): Computing local AIG has failed.\n" );
         return NULL;
     }
-//    printf( "%d ", Vec_PtrSize(p->vTemp) );
     // clean the cuts
     If_CutForEachLeaf( pIfMan, pCut, pLeaf, i )
         If_CutSetData( If_ObjCutBest(pLeaf), NULL );
@@ -754,10 +730,7 @@ Vec_Ptr_t * Abc_NtkFindGoodOrder( Abc_Ntk_t * pNtk )
     Abc_NtkIncrementTravId( pNtk );
     vNodes = Vec_PtrAlloc( 100 );
     Vec_PtrForEachEntry( Abc_Obj_t *, vCos, pNode, i )
-    {
         Abc_NtkFindGoodOrder_rec( Abc_ObjFanin0(pNode), vNodes );
-//        printf( "%.2f ", Abc_Int2Float((int)pNode->pCopy) );
-    }
     Vec_PtrFree( vCos );
     return vNodes;
 }
@@ -811,475 +784,6 @@ void Abc_NtkMarkMux( Abc_Obj_t * pDriver, Abc_Obj_t ** ppNode1, Abc_Obj_t ** ppN
     *ppNode2 = Abc_ObjRegular(pNodeT);
 }
 
-/**Function*************************************************************
-
-  Synopsis    [Sets PO drivers.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Abc_NtkCollectPoDrivers( If_Man_t * p, Abc_Ntk_t * pNtk )
-{
-    Vec_Int_t * vTemp;
-    Abc_Obj_t * pObj, * pDriver;
-    If_Obj_t * pIfObj;
-    int i, g, nGroups;
-    if ( pNtk->nRealPos == 0 )
-    {
-        if ( !Abc_FrameReadFlag("silentmode") )
-            printf( "PO drivers are not defined.\n" );
-        return;
-    }
-    if ( (Abc_NtkPoNum(pNtk) - pNtk->nRealPos) % 5 != 0 )
-    {
-        if ( !Abc_FrameReadFlag("silentmode") )
-            printf( "PO drivers are not divisible by 5.\n" );
-        return;
-    }
-    nGroups = (Abc_NtkPoNum(pNtk) - pNtk->nRealPos) / 5;
-    if ( !Abc_FrameReadFlag("silentmode") )
-        printf( "Processing %d groups of PO drivers.\n", nGroups );
-    // mark the drivers (0 a   1 b   2 c   3 s   4 c)
-    assert( p->pDriverCuts == NULL );
-    p->pDriverCuts = ABC_CALLOC( Vec_Int_t *, If_ManObjNum(p) );
-    for ( g = 0; g < nGroups; g++ )
-    {
-        // collect inputs
-        vTemp = Vec_IntAlloc( 3 );
-        for ( i = 0; i < 3; i++ )
-        {
-            pObj   = Abc_NtkPo( pNtk, pNtk->nRealPos + g * 5 + i );
-            pIfObj = If_Regular( ((If_Obj_t *)pObj->pCopy)->pFanin0 );
-            Vec_IntPush( vTemp, pIfObj->Id );
-        }
-//        Vec_IntSort( vTemp, 0 );
-        // find output node
-        pObj   = Abc_NtkPo( pNtk, pNtk->nRealPos + g * 5 + 3 );
-        pIfObj = If_Regular( ((If_Obj_t *)pObj->pCopy)->pFanin0 );
-        if ( !If_ObjIsConst1(pIfObj) && p->pDriverCuts[pIfObj->Id] == NULL )
-            p->pDriverCuts[pIfObj->Id] = Vec_IntDup( vTemp );
-        // find output node
-        pObj   = Abc_NtkPo( pNtk, pNtk->nRealPos + g * 5 + 4 );
-        pIfObj = If_Regular( ((If_Obj_t *)pObj->pCopy)->pFanin0 );
-        if ( !If_ObjIsConst1(pIfObj) && p->pDriverCuts[pIfObj->Id] == NULL )
-        {
-            p->pDriverCuts[pIfObj->Id] = Vec_IntDup( vTemp );
-            pIfObj->fDriver = 1;
-//            printf( "%d ", pIfObj->Id );
-        }
-        Vec_IntFree( vTemp );
-    }
-//    printf( "\n" );
-    return;
-
-    // highlight inner logic
-    for ( i = pNtk->nRealPos; i <  Abc_NtkPoNum(pNtk); i += 5 )
-    {
-        Abc_Obj_t * pNode1, * pNode2;
-
-        pObj = Abc_NtkPo( pNtk, i + 4 );
-        pDriver = Abc_ObjFanin0( pObj );
-        Abc_NtkMarkMux( pDriver, &pNode1, &pNode2 );
-
-/*
-        pObj = Abc_NtkPo( pNtk, i + 3 );
-        pDriver = Abc_ObjFanin0( pObj );
-        Abc_NtkMarkMux( pDriver, &pNode1, &pNode2 );
-        if ( pNode1 == NULL )
-            continue;
-
-        assert( Abc_ObjRegular(pNode1) != Abc_ObjRegular(pNode2) );
-//        Abc_NtkMarkMux( pNode1, &pNode1, &pNode2 );
-//        Abc_NtkMarkMux( pNode2, &pNode1, &pNode2 );
-*/
-    }
-
-/*
-    {
-        Vec_Int_t * vInfo;
-        int i, k, numPo;
-
-        Vec_VecForEachLevelInt( pNtk->vRealPos, vInfo, i )
-        {
-            numPo = Vec_IntEntry( vInfo, 0 );
-            pObj = Abc_NtkPo( pNtk, numPo+2 );
-            pDriver = Abc_ObjFanin0( pObj );
-            pIfObj = If_Regular( (If_Obj_t *)pDriver->pCopy );
-            pIfObj->fSkipCut = 0;
-
-            numPo = Vec_IntEntryLast( vInfo );
-            pObj = Abc_NtkPo( pNtk, numPo+4 );
-            pDriver = Abc_ObjFanin0( pObj );
-            pIfObj = If_Regular( (If_Obj_t *)pDriver->pCopy );
-            pIfObj->fSkipCut = 0;
-
-            Vec_IntForEachEntry( vInfo, numPo, k )
-            {
-                pObj = Abc_NtkPo( pNtk, numPo+0 );
-                pDriver = Abc_ObjFanin0( pObj );
-                pIfObj = If_Regular( (If_Obj_t *)pDriver->pCopy );
-                pIfObj->fSkipCut = 0;
-
-                pObj = Abc_NtkPo( pNtk, numPo+1 );
-                pDriver = Abc_ObjFanin0( pObj );
-                pIfObj = If_Regular( (If_Obj_t *)pDriver->pCopy );
-                pIfObj->fSkipCut = 0;
-
-                pObj = Abc_NtkPo( pNtk, numPo+2 );
-                pDriver = Abc_ObjFanin0( pObj );
-                pIfObj = If_Regular( (If_Obj_t *)pDriver->pCopy );
-                pIfObj->fSkipCut = 0;
-
-                pObj = Abc_NtkPo( pNtk, numPo+3 );
-                pDriver = Abc_ObjFanin0( pObj );
-                pIfObj = If_Regular( (If_Obj_t *)pDriver->pCopy );
-                pIfObj->fSkipCut = 0;
-            }
-        }
-    }
-*/
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    [Frees PO drivers.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Abc_NtkCreateChoiceDrivers( If_Man_t * p )
-{
-    Vec_Int_t * vVec;
-    If_Obj_t * pObj, * pTemp;
-    int i, Counter = 0;
-    if ( p->pDriverCuts == NULL )
-        return;
-    If_ManForEachNode( p, pObj, i )
-    {
-        // skip non-choice nodes
-        if ( pObj->pEquiv == NULL || pObj->nRefs == 0 )
-            continue;
-        // find driver cut
-        vVec = NULL;
-        for ( pTemp = pObj; pTemp; pTemp = pTemp->pEquiv )
-            if ( p->pDriverCuts[pTemp->Id] != NULL )
-            {
-                vVec = Vec_IntDup( p->pDriverCuts[pTemp->Id] );
-                break;
-            }
-        if ( vVec == NULL )
-            continue;
-        // transfer driver cut to the root node
-        for ( pTemp = pObj; pTemp; pTemp = pTemp->pEquiv )
-        {
-            Vec_IntFreeP( &p->pDriverCuts[pTemp->Id] );
-            p->pDriverCuts[pTemp->Id] = Vec_IntDup( vVec );
-        }
-        Vec_IntFree( vVec );
-        Counter++;
-    }
-//    printf( "Choice driver cut updates = %d.\n", Counter );
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Frees PO drivers.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Abc_NtkFreePoDrivers( If_Man_t * p, Abc_Ntk_t * pNtk )
-{
-    If_Obj_t * pObj;
-    If_Cut_t * pCut;
-    int i;
-    if ( p->pDriverCuts == NULL )
-        return;
-    pNtk->nRealDelay = p->RequiredGlo;
-    if ( !Abc_FrameReadFlag("silentmode") )
-        printf( "Actual delay after mapping = %.2f\n", p->RequiredGlo );
-    assert( Abc_NtkPoNum(pNtk) == If_ManCoNum(p) - Abc_NtkLatchNum(pNtk) );
-    // print the cut sizes of the drivers
-    for ( i = pNtk->nRealPos; i <  Abc_NtkPoNum(pNtk); i += 5 )
-    {
-        pObj = If_ManCo( p, i + 4 );
-        pObj = If_Regular(pObj->pFanin0);
-        if ( !pObj->fDriver )
-            continue;
-        pCut = If_ObjCutBest(pObj);
-//        printf( "%d(%d) ", pObj->Id, pCut->nLeaves );
-    }
-//    printf( "\n" );
-    for ( i = 0; i < If_ManObjNum(p); i++ )
-        Vec_IntFreeP( &p->pDriverCuts[i] );
-    ABC_FREE( p->pDriverCuts );
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    [Returns 1 if pOld is in the TFI of pNew.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Abc_NtkIfCheckTfi_rec( Abc_Obj_t * pNode, Abc_Obj_t * pOld )
-{
-    Abc_Obj_t * pFanin;
-    int k;
-    if ( pNode == NULL )
-        return 0;
-    if ( pNode == pOld )
-        return 1;
-    // check the trivial cases
-    if ( Abc_ObjIsCi(pNode) )
-        return 0; 
-    assert( Abc_ObjIsNode(pNode) );
-    // if this node is already visited, skip
-    if ( Abc_NodeIsTravIdCurrent( pNode ) )
-        return 0;
-    // mark the node as visited
-    Abc_NodeSetTravIdCurrent( pNode );
-    // check the children
-    Abc_ObjForEachFanin( pNode, pFanin, k )
-        if ( Abc_NtkIfCheckTfi_rec( pFanin, pOld ) )
-            return 1;
-    return 0;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Returns 1 if pOld is in the TFI of pNew.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Abc_NtkIfCheckTfi( Abc_Ntk_t * pNtk, Abc_Obj_t * pOld, Abc_Obj_t * pNew )
-{
-    assert( !Abc_ObjIsComplement(pOld) );
-    assert( !Abc_ObjIsComplement(pNew) );
-    Abc_NtkIncrementTravId(pNtk);
-    return Abc_NtkIfCheckTfi_rec( pNew, pOld );
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    []
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Abc_NtkIfCheckRealNodes( Abc_Ntk_t * pNtk )
-{
-    Abc_Obj_t * pObj;
-    int i, iNode;
-    for ( i = pNtk->nRealPos; i < Abc_NtkPoNum(pNtk); i += 5 )
-    {
-        iNode = Vec_IntEntry( pNtk->vRealNodes, i+3 - pNtk->nRealPos );
-        pObj = Abc_NtkObj( pNtk, iNode );
-        assert( Abc_ObjFaninNum(pObj) == 2 );
-
-        iNode = Vec_IntEntry( pNtk->vRealNodes, i+4 - pNtk->nRealPos );
-        pObj = Abc_NtkObj( pNtk, iNode );
-        assert( Abc_ObjFaninNum(pObj) == 3 );
-    }
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Restores the structure.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Abc_NtkRecreatePoDrivers( If_Man_t * p, Abc_Ntk_t * pNtkNew )
-{
-    Abc_Obj_t * pNode, * pExor, * pObj, * pFanin, * pFaninNew;
-    Vec_Ptr_t * vDrivers, * vDriversNew, * vFanins;
-    Vec_Int_t * vInfo, * vNodeMap, * vDriverInvs;
-    int i, k, numPo, nRealLuts, fCompl;
-    float RealLutArea;
-    if ( pNtkNew->vRealPos == NULL )
-    {
-        if ( !Abc_FrameReadFlag("silentmode") )
-            printf( "Missing key information.\n" );
-        return;
-    }
-
-    assert( pNtkNew->vRealNodes == NULL );
-    // create drivers
-    vDrivers = Vec_PtrStart( pNtkNew->nRealPos );
-    vDriverInvs = Vec_IntStart( pNtkNew->nRealPos );
-    pNtkNew->vRealNodes = Vec_IntAlloc( Abc_NtkPoNum(pNtkNew) - pNtkNew->nRealPos );
-    for ( i = pNtkNew->nRealPos; i < Abc_NtkPoNum(pNtkNew); i++ )
-    {
-        pObj = Abc_NtkPo( pNtkNew, i );
-        if ( Abc_ObjFaninC0(pObj) )
-            pNode = Abc_NtkCreateNodeInv( pNtkNew, Abc_ObjFanin0(pObj) );
-        else
-            pNode = Abc_NtkCreateNodeBuf( pNtkNew, Abc_ObjFanin0(pObj) );
-//        if ( i % 5 == 4 )
-//            printf( "%d", Abc_ObjFaninC0(pObj) );
-        Vec_PtrPush( vDrivers, pNode );
-        Vec_IntPush( vDriverInvs, Abc_ObjFaninC0(pObj) );
-        Vec_IntPush( pNtkNew->vRealNodes, Abc_ObjId(pNode) );
-    }
-    assert( Vec_PtrSize( vDrivers ) == Abc_NtkPoNum( pNtkNew ) );
-
-    // create new logic
-    vFanins = Vec_PtrAlloc( 2 );
-    vDriversNew = Vec_PtrStart( Abc_NtkPoNum(pNtkNew) );
-    Vec_VecForEachLevelInt( pNtkNew->vRealPos, vInfo, i )
-    {
-        // find complemented attribute
-        numPo  = Vec_IntEntry( vInfo, 0 );
-        fCompl = (strstr( Abc_ObjName(Abc_NtkPo(pNtkNew, numPo)), "SUB" ) != NULL);
-        // consider parts
-        Vec_IntForEachEntry( vInfo, numPo, k )
-        {
-            // update input
-            if ( k > 0 )
-                Vec_PtrWriteEntry( vDriversNew, numPo+2, pNode );
-            // create first XOR
-            Vec_PtrClear( vFanins );
-            Vec_PtrPush( vFanins, (Abc_Obj_t *)Vec_PtrEntry(vDrivers, numPo+0) );
-            Vec_PtrPush( vFanins, (Abc_Obj_t *)Vec_PtrEntry(vDrivers, numPo+1) );
-            pExor = Abc_NtkCreateNodeExor( pNtkNew, vFanins );
-            // update polarity
-            pExor->pData = Hop_NotCond( (Hop_Obj_t *)pExor->pData, fCompl );
-            // create second XOR
-            Vec_PtrClear( vFanins );
-            Vec_PtrPush( vFanins, pExor );
-            Vec_PtrPush( vFanins, (Abc_Obj_t *)Vec_PtrEntry(vDrivers, numPo+2) ); 
-            pNode = Abc_NtkCreateNodeExor( pNtkNew, vFanins );
-            // update pointers
-            Vec_PtrWriteEntry( vDriversNew, numPo+3, pNode );
-            Vec_IntWriteEntry( pNtkNew->vRealNodes, numPo+3 - pNtkNew->nRealPos, Abc_ObjId(pNode) );
-            // create MUX
-            pNode = Abc_NtkCreateNodeMux( pNtkNew, pExor, 
-                (Abc_Obj_t *)Vec_PtrEntry(vDrivers, numPo+2), 
-                (Abc_Obj_t *)Vec_PtrEntry(vDrivers, numPo+(fCompl ? 0 : 1)) );
-            // update pointers
-            Vec_PtrWriteEntry( vDriversNew, numPo+4, pNode );
-            Vec_IntWriteEntry( pNtkNew->vRealNodes, numPo+4 - pNtkNew->nRealPos, Abc_ObjId(pNode) );
-        }
-    }
-    Vec_PtrFree( vFanins );
-
-    Abc_NtkIfCheckRealNodes( pNtkNew );
-
-    // map internal nodes into PO numbers
-    vNodeMap = Vec_IntStartFull( Abc_NtkObjNumMax(pNtkNew) );
-    Vec_VecForEachLevelInt( pNtkNew->vRealPos, vInfo, i )
-    Vec_IntForEachEntryReverse( vInfo, numPo, k )
-    {
-        pObj = Abc_NtkPo( pNtkNew, numPo+3 );
-        Vec_IntWriteEntry( vNodeMap, Abc_ObjId( Abc_ObjFanin0(pObj) ), numPo+3 );
-
-        // update the PO pointer
-//        if ( Abc_ObjFaninC0(pObj) )
-//            Abc_ObjXorFaninC( pObj, 0 );
-//       Abc_ObjPatchFanin( pObj, Abc_ObjFanin0(pObj), Vec_PtrEntry(vDriversNew, numPo+3) );
-
-        pObj = Abc_NtkPo( pNtkNew, numPo+4 );
-        Vec_IntWriteEntry( vNodeMap, Abc_ObjId( Abc_ObjFanin0(pObj) ), numPo+4 );
-
-        // update the PO pointer
-//        if ( Abc_ObjFaninC0(pObj) )
-//            Abc_ObjXorFaninC( pObj, 0 );
-//        Abc_ObjPatchFanin( pObj, Abc_ObjFanin0(pObj), Vec_PtrEntry(vDriversNew, numPo+4) );
-
-    }
-
-    // replace logic
-    Abc_NtkForEachObj( pNtkNew, pObj, i )
-    {
-//        if ( Abc_ObjIsPo(pObj) )
-//            continue;
-        Abc_ObjForEachFanin( pObj, pFanin, k )
-        {
-            if ( !Abc_ObjIsNode(pFanin) || Abc_ObjFaninNum(pFanin) == 0 )
-                continue;
-            numPo = Vec_IntEntry( vNodeMap, Abc_ObjId(pFanin) );
-            if ( numPo == ~0 )
-                continue;
-            // get the node and the complemented bit
-            pFaninNew = (Abc_Obj_t *)Vec_PtrEntry( vDriversNew, numPo );
-            fCompl    = Vec_IntEntry( vDriverInvs, numPo );
-            if ( fCompl )
-                pFaninNew = Abc_NtkCreateNodeInv( pNtkNew, pFaninNew );
-//            else
-//                pFaninNew = Abc_NtkCreateNodeBuf( pNtkNew, pFaninNew );
-
-            if ( !Abc_NtkIfCheckTfi( pNtkNew, pObj, pFaninNew ) )
-                Abc_ObjPatchFanin( pObj, pFanin, pFaninNew );
-        }
-    }    
-
-    // sweep
-    Abc_NtkCleanupNodes( pNtkNew, vDriversNew, 0 );
-
-    // make sure that all vDriversNew are still present
-    {
-        Abc_Obj_t * pObj;
-        int i;
-        Vec_PtrForEachEntry( Abc_Obj_t *, vDriversNew, pObj, i )
-            if ( pObj && Abc_ObjIsNone(pObj) )
-                assert( 0 );
-    }
-
-    Vec_PtrFree( vDrivers );
-    Vec_PtrFree( vDriversNew );
-    Vec_IntFree( vNodeMap );
-    Vec_IntFree( vDriverInvs );
-
-    // count non-trivial LUTs nodes
-    nRealLuts   = -2 * Vec_VecSizeSize(pNtkNew->vRealPos);
-    RealLutArea = -(p->pPars->pLutLib ? p->pPars->pLutLib->pLutAreas[2] + p->pPars->pLutLib->pLutAreas[3] : 2.0) * Vec_VecSizeSize(pNtkNew->vRealPos);
-    Abc_NtkForEachNode( pNtkNew, pNode, i )
-        if ( Abc_ObjFaninNum(pNode) > 1 )
-        {
-            nRealLuts++;
-            RealLutArea += p->pPars->pLutLib->pLutAreas[Abc_ObjFaninNum(pNode)];
-        }
-    if ( !Abc_FrameReadFlag("silentmode") )
-        printf( "The number of real LUTs = %d.  Real LUT area = %.2f.\n", nRealLuts, RealLutArea );
-    pNtkNew->nRealLuts = nRealLuts;
-    pNtkNew->nRealArea = RealLutArea;
-
-    Abc_NtkIfCheckRealNodes( pNtkNew );
-
-}
 
 ////////////////////////////////////////////////////////////////////////
 ///                       END OF FILE                                ///
diff --git a/src/base/abci/abcPrint.c b/src/base/abci/abcPrint.c
index efeaabe9..365b7767 100644
--- a/src/base/abci/abcPrint.c
+++ b/src/base/abci/abcPrint.c
@@ -226,8 +226,6 @@ void Abc_NtkPrintStats( Abc_Ntk_t * pNtk, int fFactored, int fSaveBest, int fDum
     Abc_Print( 1," i/o =%5d/%5d", Abc_NtkPiNum(pNtk), Abc_NtkPoNum(pNtk) );
     if ( Abc_NtkConstrNum(pNtk) )
         Abc_Print( 1,"(c=%d)", Abc_NtkConstrNum(pNtk) );
-//    if ( pNtk->nRealPos )
-//        Abc_Print( 1,"(p=%d)", Abc_NtkPoNum(pNtk) - pNtk->nRealPos );
     Abc_Print( 1,"  lat =%5d", Abc_NtkLatchNum(pNtk) );
     if ( Abc_NtkIsNetlist(pNtk) )
     {
diff --git a/src/base/abci/abcSweep.c b/src/base/abci/abcSweep.c
index 87c90a31..7eae3587 100644
--- a/src/base/abci/abcSweep.c
+++ b/src/base/abci/abcSweep.c
@@ -972,13 +972,6 @@ int Abc_NtkSweepBufsInvs( Abc_Ntk_t * pNtk, int fVerbose )
     pMan = (Hop_Man_t *)pNtk->pManFunc;
     // label selected nodes
     Abc_NtkIncrementTravId( pNtk );
-    if ( pNtk->vRealNodes )
-    {
-        Abc_Obj_t * pObj;
-        assert( Vec_IntSize(pNtk->vRealNodes) == Abc_NtkPoNum(pNtk) - pNtk->nRealPos );
-        Abc_NtkForEachObjVec( pNtk->vRealNodes, pNtk, pObj, i )
-            Abc_NodeSetTravIdCurrent( pObj );
-    }
     // iterate till no improvement
     while ( fChanges )
     {