1 files changed, 157 insertions, 0 deletions
diff --git a/src/aig/cnf/cnfUtil.c b/src/aig/cnf/cnfUtil.c
new file mode 100644
index 00000000..249f43fb
--- /dev/null
+++ b/src/aig/cnf/cnfUtil.c
@@ -0,0 +1,157 @@
+/**CFile****************************************************************
+
+  FileName    [cnfUtil.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [AIG-to-CNF conversion.]
+
+  Synopsis    []
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: cnfUtil.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "cnf.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Computes area, references, and nodes used in the mapping.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Dar_ManScanMapping_rec( Cnf_Man_t * p, Dar_Obj_t * pObj, Vec_Ptr_t * vMapped )
+{
+    Dar_Obj_t * pLeaf;
+    Dar_Cut_t * pCutBest;
+    int aArea, i;
+    if ( pObj->nRefs++ || Dar_ObjIsPi(pObj) || Dar_ObjIsConst1(pObj) )
+        return 0;
+    assert( Dar_ObjIsAnd(pObj) );
+    // collect the node first to derive pre-order
+    if ( vMapped )
+        Vec_PtrPush( vMapped, pObj );
+    // visit the transitive fanin of the selected cut
+    pCutBest = Dar_ObjBestCut(pObj);
+    aArea = pCutBest->Cost;
+    Dar_CutForEachLeaf( p->pManAig, pCutBest, pLeaf, i )
+        aArea += Dar_ManScanMapping_rec( p, pLeaf, vMapped );
+    return aArea;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes area, references, and nodes used in the mapping.]
+
+  Description [Collects the nodes in reverse topological order.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Ptr_t * Dar_ManScanMapping( Cnf_Man_t * p, int fCollect )
+{
+    Vec_Ptr_t * vMapped = NULL;
+    Dar_Obj_t * pObj;
+    int i;
+    // clean all references
+    Dar_ManForEachObj( p->pManAig, pObj, i )
+        pObj->nRefs = 0;
+    // allocate the array
+    if ( fCollect )
+        vMapped = Vec_PtrAlloc( 1000 );
+    // collect nodes reachable from POs in the DFS order through the best cuts
+    p->aArea = 0;
+    Dar_ManForEachPo( p->pManAig, pObj, i )
+        p->aArea += Dar_ManScanMapping_rec( p, Dar_ObjFanin0(pObj), vMapped );
+    printf( "Variables = %6d. Clauses = %8d.\n", vMapped? Vec_PtrSize(vMapped) : 0, p->aArea );
+    return vMapped;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes area, references, and nodes used in the mapping.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Cnf_ManScanMapping_rec( Cnf_Man_t * p, Dar_Obj_t * pObj, Vec_Ptr_t * vMapped )
+{
+    Dar_Obj_t * pLeaf;
+    Cnf_Cut_t * pCutBest;
+    int aArea, i;
+    if ( pObj->nRefs++ || Dar_ObjIsPi(pObj) || Dar_ObjIsConst1(pObj) )
+        return 0;
+    assert( Dar_ObjIsAnd(pObj) );
+    assert( pObj->pData != NULL );
+    // visit the transitive fanin of the selected cut
+    pCutBest = pObj->pData;
+    assert( pCutBest->Cost < 127 );
+    aArea = pCutBest->Cost;
+    Cnf_CutForEachLeaf( p->pManAig, pCutBest, pLeaf, i )
+        aArea += Cnf_ManScanMapping_rec( p, pLeaf, vMapped );
+    // collect the node first to derive pre-order
+    if ( vMapped )
+        Vec_PtrPush( vMapped, pObj );
+    return aArea;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes area, references, and nodes used in the mapping.]
+
+  Description [Collects the nodes in reverse topological order.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Ptr_t * Cnf_ManScanMapping( Cnf_Man_t * p, int fCollect )
+{
+    Vec_Ptr_t * vMapped = NULL;
+    Dar_Obj_t * pObj;
+    int i;
+    // clean all references
+    Dar_ManForEachObj( p->pManAig, pObj, i )
+        pObj->nRefs = 0;
+    // allocate the array
+    if ( fCollect )
+        vMapped = Vec_PtrAlloc( 1000 );
+    // collect nodes reachable from POs in the DFS order through the best cuts
+    p->aArea = 0;
+    Dar_ManForEachPo( p->pManAig, pObj, i )
+        p->aArea += Cnf_ManScanMapping_rec( p, Dar_ObjFanin0(pObj), vMapped );
+    printf( "Variables = %6d. Clauses = %8d.\n", vMapped? Vec_PtrSize(vMapped) : 0, p->aArea );
+    return vMapped;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+