1 files changed, 165 insertions, 0 deletions
diff --git a/src/aig/ntl/ntlUtil.c b/src/aig/ntl/ntlUtil.c
new file mode 100644
index 00000000..b13dd3a7
--- /dev/null
+++ b/src/aig/ntl/ntlUtil.c
@@ -0,0 +1,165 @@
+/**CFile****************************************************************
+
+  FileName    [ntlUtil.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Netlist representation.]
+
+  Synopsis    [Various utilities.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 20, 2005.]
+
+  Revision    [$Id: ntlUtil.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "ntl.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Returns 1 if netlist was written by ABC with added bufs/invs.]
+
+  Description [Should be called immediately after reading from file.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ntl_ManTransformCoDrivers( Ntl_Man_t * p )
+{
+    Vec_Ptr_t * vCoNets;
+    Ntl_Net_t * pNetCo, * pNetFanin;
+    Ntl_Obj_t * pObj;
+    Ntl_Mod_t * pRoot;
+    int i, k, Counter;
+    pRoot = Ntl_ManRootModel( p );
+    // collect the nets of the root model
+    vCoNets = Vec_PtrAlloc( 1000 );
+    Ntl_ModelForEachPo( pRoot, pObj, i )
+        if ( !Ntl_ObjFanin0(pObj)->fMark )
+        {
+            Ntl_ObjFanin0(pObj)->fMark = 1;
+            Vec_PtrPush( vCoNets, Ntl_ObjFanin0(pObj) );
+        }
+    Ntl_ModelForEachLatch( pRoot, pObj, i )
+        if ( !Ntl_ObjFanin0(pObj)->fMark )
+        {
+            Ntl_ObjFanin0(pObj)->fMark = 1;
+            Vec_PtrPush( vCoNets, Ntl_ObjFanin0(pObj) );
+        }
+    Ntl_ModelForEachBox( pRoot, pObj, k )
+    Ntl_ObjForEachFanin( pObj, pNetCo, i )
+        if ( !pNetCo->fMark )
+        {
+            pNetCo->fMark = 1;
+            Vec_PtrPush( vCoNets, pNetCo );
+        }
+    // check the nets
+    Vec_PtrForEachEntry( vCoNets, pNetCo, i )
+    {
+        if ( !Ntl_ObjIsNode(pNetCo->pDriver) )
+            continue;
+        if ( Ntl_ObjFaninNum(pNetCo->pDriver) != 1 )
+            break;
+        pNetFanin = Ntl_ObjFanin0(pNetCo->pDriver);
+        if ( !Ntl_ObjIsNode(pNetFanin->pDriver) )
+            break;
+    }
+    if ( i < Vec_PtrSize(vCoNets) )
+    {
+        Vec_PtrFree( vCoNets );
+        return 0;
+    }
+
+
+    // remove the buffers/inverters
+    Counter = 0;
+    Vec_PtrForEachEntry( vCoNets, pNetCo, i )
+    {
+        pNetCo->fMark = 0;
+        if ( !Ntl_ObjIsNode(pNetCo->pDriver) )
+            continue;
+        // if this net is driven by an interver
+        // set the complemented attribute of the CO
+        assert( Ntl_ObjFaninNum(pNetCo->pDriver) == 1 );
+        pNetCo->fCompl = (int)(pNetCo->pDriver->pSop[0] == '0');
+        // remove the driver
+        Vec_PtrWriteEntry( pRoot->vObjs, pNetCo->pDriver->Id, NULL );
+        // remove the net
+        pNetFanin = Ntl_ObjFanin0(pNetCo->pDriver);
+        Ntl_ModelDeleteNet( pRoot, pNetFanin );
+        // make the CO net point to the new driver
+        assert( Ntl_ObjIsNode(pNetFanin->pDriver) );
+        pNetCo->pDriver = NULL;
+        pNetFanin->pDriver->pFanio[pNetFanin->pDriver->nFanins] = NULL;
+        Ntl_ModelSetNetDriver( pNetFanin->pDriver, pNetCo );
+        Counter++;
+    }
+    Vec_PtrFree( vCoNets );
+    pRoot->nObjs[NTL_OBJ_NODE] -= Counter;
+    return Counter;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Derives the array of CI names.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Ptr_t * Ntl_ManCollectCiNames( Ntl_Man_t * p )
+{
+    Vec_Ptr_t * vNames;
+    Ntl_Net_t * pNet;
+    int i;
+    vNames = Vec_PtrAlloc( 1000 );
+    Ntl_ManForEachCiNet( p, pNet, i )
+        Vec_PtrPush( vNames, pNet->pName );
+    return vNames;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Derives the array of CI names.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Ptr_t * Ntl_ManCollectCoNames( Ntl_Man_t * p )
+{
+    Vec_Ptr_t * vNames;
+    Ntl_Net_t * pNet;
+    int i;
+    vNames = Vec_PtrAlloc( 1000 );
+    Ntl_ManForEachCoNet( p, pNet, i )
+        Vec_PtrPush( vNames, pNet->pName );
+    return vNames;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+