Version abc80410

1 files changed, 165 insertions, 0 deletions

diff --git a/src/aig/ntl/ntlSweep.c b/src/aig/ntl/ntlSweep.c
new file mode 100644
index 00000000..3b9cd61f
--- /dev/null
+++ b/src/aig/ntl/ntlSweep.c
@@ -0,0 +1,165 @@
+/**CFile****************************************************************
+
+  FileName    [ntlSweep.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Netlist representation.]
+
+  Synopsis    [Performs structural sweep of the netlist.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 20, 2005.]
+
+  Revision    [$Id: ntlSweep.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "ntl.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Detects logic that does not fanout into POs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ntl_ManSweepMark_rec( Ntl_Man_t * p, Ntl_Obj_t * pObj )
+{
+    Ntl_Net_t * pNet;
+    int i;
+    if ( pObj->fMark )
+        return;
+    pObj->fMark = 1;
+    Ntl_ObjForEachFanin( pObj, pNet, i )
+        Ntl_ManSweepMark_rec( p, pNet->pDriver );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Detects logic that does not fanout into POs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ntl_ManSweepMark( Ntl_Man_t * p )
+{
+    Ntl_Mod_t * pRoot;
+    Ntl_Obj_t * pObj;
+    int i;
+    // get the root model
+    pRoot = Ntl_ManRootModel( p );
+    // clear net visited flags
+    Ntl_ModelForEachObj( pRoot, pObj, i )
+        assert( pObj->fMark == 0 );
+    // label the primary inputs
+    Ntl_ModelForEachPi( pRoot, pObj, i )
+        pObj->fMark = 1;
+    // start from the primary outputs
+    Ntl_ModelForEachPo( pRoot, pObj, i )
+        Ntl_ManSweepMark_rec( p, pObj );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Derives new netlist by sweeping current netlist with the current AIG.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ntl_Man_t * Ntl_ManSweep( Ntl_Man_t * p, Aig_Man_t * pAig, int fVerbose )
+{
+    int nObjsOld[NTL_OBJ_VOID];
+    Ntl_Man_t * pNew;
+    Ntl_Mod_t * pRoot;
+    Ntl_Net_t * pNet;
+    Ntl_Obj_t * pObj;
+    int i, k, nNetsOld;
+
+    // insert the AIG into the netlist
+    pNew = Ntl_ManInsertAig( p, pAig );
+    if ( pNew == NULL )
+    {
+        printf( "Ntl_ManSweep(): Inserting AIG has failed.\n" );
+        return NULL;
+    }
+
+    // remember the number of objects
+    pRoot = Ntl_ManRootModel( pNew );
+    for ( i = 0; i < NTL_OBJ_VOID; i++ )
+        nObjsOld[i] = pRoot->nObjs[i];
+    nNetsOld = Ntl_ModelCountNets(pRoot);
+
+    // mark the nets that do not fanout into POs
+    Ntl_ManSweepMark( pNew );
+
+    // remove the useless objects and their nets
+    Ntl_ModelForEachObj( pRoot, pObj, i )
+    {
+        if ( pObj->fMark )
+        {
+            pObj->fMark = 0;
+            continue;
+        }
+        // remove the fanout nets
+        Ntl_ObjForEachFanout( pObj, pNet, k )
+            Ntl_ModelDeleteNet( pRoot, Ntl_ObjFanout0(pObj) );
+        // remove the object
+        if ( Ntl_ObjIsNode(pObj) && Ntl_ObjFaninNum(pObj) == 1 )
+            pRoot->nObjs[NTL_OBJ_LUT1]--;
+        else
+            pRoot->nObjs[pObj->Type]--;
+        Vec_PtrWriteEntry( pRoot->vObjs, pObj->Id, NULL );
+        pObj->Id = NTL_OBJ_NONE;
+    }
+
+    // print detailed statistics of sweeping
+    if ( fVerbose )
+    {
+        printf( "Sweep:" );
+        printf( "  Node = %d (%4.1f %%)", 
+            nObjsOld[NTL_OBJ_NODE] - pRoot->nObjs[NTL_OBJ_NODE],
+            !nObjsOld[NTL_OBJ_NODE]? 0.0: 100.0 * (nObjsOld[NTL_OBJ_NODE] - pRoot->nObjs[NTL_OBJ_NODE]) / nObjsOld[NTL_OBJ_NODE] );
+        printf( "  Buf/Inv = %d (%4.1f %%)", 
+            nObjsOld[NTL_OBJ_LUT1] - pRoot->nObjs[NTL_OBJ_LUT1],
+            !nObjsOld[NTL_OBJ_LUT1]? 0.0: 100.0 * (nObjsOld[NTL_OBJ_LUT1] - pRoot->nObjs[NTL_OBJ_LUT1]) / nObjsOld[NTL_OBJ_LUT1] );
+        printf( "  Lat = %d (%4.1f %%)", 
+            nObjsOld[NTL_OBJ_LATCH] - pRoot->nObjs[NTL_OBJ_LATCH],
+            !nObjsOld[NTL_OBJ_LATCH]? 0.0: 100.0 * (nObjsOld[NTL_OBJ_LATCH] - pRoot->nObjs[NTL_OBJ_LATCH]) / nObjsOld[NTL_OBJ_LATCH] );
+        printf( "  Box = %d (%4.1f %%)", 
+            nObjsOld[NTL_OBJ_BOX] - pRoot->nObjs[NTL_OBJ_BOX],
+            !nObjsOld[NTL_OBJ_BOX]? 0.0: 100.0 * (nObjsOld[NTL_OBJ_BOX] - pRoot->nObjs[NTL_OBJ_BOX]) / nObjsOld[NTL_OBJ_BOX] );
+        printf( "\n" );
+//        printf( "Also, sweep reduced %d nets.\n", nNetsOld - Ntl_ModelCountNets(pRoot) );
+    }
+    return pNew;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+