Experiments with simulation.

src/proof/cec/cecSimBack.c

+/**CFile****************************************************************
+
+  FileName    [cecSimBack.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Combinational equivalence checking.]
+
+  Synopsis    [Backward simulation.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 20, 2005.]
+
+  Revision    [$Id: cecSimBack.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "cecInt.h"
+#include "aig/gia/giaAig.h"
+
+ABC_NAMESPACE_IMPL_START
+
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Cec_ObjSatVerify( Gia_Man_t * p, Gia_Obj_t * pRoot, int Value )
+{
+    Gia_Obj_t * pObj;
+    int i, RetValue = 1;
+    printf( "Obj = %4d  Value = %d  ", Gia_ObjId(p, pRoot), Value );
+    Gia_ObjTerSimSet0( Gia_ManConst0(p) );
+    Gia_ManForEachCi( p, pObj, i )
+        if ( !Gia_ObjIsTravIdCurrent(p, pObj) )
+            Gia_ObjTerSimSetX( pObj ), printf( "x" );
+        else if ( pObj->fMark0 )
+            Gia_ObjTerSimSet1( pObj ), printf( "1" );
+        else
+            Gia_ObjTerSimSet0( pObj ), printf( "0" );
+    printf( " " );
+    Gia_ManForEachAnd( p, pObj, i )
+        Gia_ObjTerSimAnd( pObj );
+    if ( Value ? Gia_ObjTerSimGet1(pRoot) : Gia_ObjTerSimGet0(pRoot) )
+        printf( "Verification successful.\n" );
+    else
+        printf( "Verification failed.\n" ), RetValue = 0;
+    return RetValue;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Return 1 if pObj can have Value.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+word Cec_ManCheckSat2_rec( Gia_Man_t * p, Gia_Obj_t * pObj, word Value, Vec_Wrd_t * vValues )
+{
+    Gia_Obj_t * pFan0, * pFan1;
+    if ( Gia_ObjIsTravIdCurrent(p, pObj) )
+        return Value == (int)pObj->fMark0;
+    Gia_ObjSetTravIdCurrent(p, pObj);
+    pObj->fMark0 = Value;
+    if ( !Gia_ObjIsAnd(pObj) )
+        return 1;
+    pFan0 = Gia_ObjFanin0(pObj);
+    pFan1 = Gia_ObjFanin1(pObj);
+    if ( Value )
+    {
+        return Cec_ManCheckSat2_rec( p, pFan0, !Gia_ObjFaninC0(pObj), vValues ) &&
+               Cec_ManCheckSat2_rec( p, pFan1, !Gia_ObjFaninC1(pObj), vValues );
+    }
+    if ( Gia_ObjIsTravIdCurrent(p, pFan0) ) // already assigned
+    {
+        if ( Gia_ObjFaninC0(pObj) == (int)pFan0->fMark0 ) // justified
+            return 1;
+        return Cec_ManCheckSat2_rec( p, pFan1, Gia_ObjFaninC1(pObj), vValues );        
+    }
+    if ( Gia_ObjIsTravIdCurrent(p, pFan1) ) // already assigned
+    {
+        if ( Gia_ObjFaninC1(pObj) == (int)pFan1->fMark0 ) // justified
+            return 1;
+        return Cec_ManCheckSat2_rec( p, pFan0, Gia_ObjFaninC0(pObj), vValues );        
+    }
+    return Cec_ManCheckSat2_rec( p, pFan0, Gia_ObjFaninC0(pObj), vValues );
+}
+word Cec_ManCheckSat2( Gia_Man_t * p, Gia_Obj_t * pObj, int Value, Vec_Wrd_t * vValues )
+{
+    return 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Return 1 if pObj can have Value.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Cec_ManCheckSat_rec( Gia_Man_t * p, Gia_Obj_t * pObj, int Value )
+{
+    Gia_Obj_t * pFan0, * pFan1;
+    if ( Gia_ObjIsTravIdCurrent(p, pObj) )
+        return Value == (int)pObj->fMark0;
+    Gia_ObjSetTravIdCurrent(p, pObj);
+    pObj->fMark0 = Value;
+    if ( !Gia_ObjIsAnd(pObj) )
+        return 1;
+    pFan0 = Gia_ObjFanin0(pObj);
+    pFan1 = Gia_ObjFanin1(pObj);
+    if ( Value )
+    {
+        return Cec_ManCheckSat_rec( p, pFan0, !Gia_ObjFaninC0(pObj) ) &&
+               Cec_ManCheckSat_rec( p, pFan1, !Gia_ObjFaninC1(pObj) );
+    }
+    if ( Gia_ObjIsTravIdCurrent(p, pFan0) ) // already assigned
+    {
+        if ( Gia_ObjFaninC0(pObj) == (int)pFan0->fMark0 ) // justified
+            return 1;
+        return Cec_ManCheckSat_rec( p, pFan1, Gia_ObjFaninC1(pObj) );        
+    }
+    if ( Gia_ObjIsTravIdCurrent(p, pFan1) ) // already assigned
+    {
+        if ( Gia_ObjFaninC1(pObj) == (int)pFan1->fMark0 ) // justified
+            return 1;
+        return Cec_ManCheckSat_rec( p, pFan0, Gia_ObjFaninC0(pObj) );        
+    }
+    return Cec_ManCheckSat_rec( p, pFan0, Gia_ObjFaninC0(pObj) );
+}
+void Cec_ManSimBack( Gia_Man_t * p )
+{
+    abctime clk = Abc_Clock();
+    Vec_Wrd_t * vValues = Vec_WrdStart( Gia_ManObjNum(p) );
+    Gia_Obj_t * pObj; 
+    int i, Count = 0;
+    word Res;
+    Gia_ManSetPhase( p );
+    //Gia_ManForEachAnd( p, pObj, i )
+    //    printf( "%d", pObj->fPhase );
+    //printf( "\n" );
+    //return;
+
+    Gia_ManForEachAnd( p, pObj, i )
+    {
+        Gia_ManIncrementTravId(p);
+        //Gia_ManCleanMark0( p );
+        Res = Cec_ManCheckSat_rec( p, pObj, !pObj->fPhase );
+        //if ( Res )
+        //    Cec_ObjSatVerify( p, pObj, !pObj->fPhase );
+
+        //Res = Cec_ManCheckSat2_rec( p, pObj, !pObj->fPhase ? ~(word)0 : 0, vValues );
+        //if ( Res )
+        //    Cec_ObjSatVerify2( p, pObj, !pObj->fPhase, Res );
+
+        Count += (int)(Res > 0);
+    }
+    Vec_WrdFree( vValues );
+    printf( "Obj = %6d.  SAT = %6d.  ", Gia_ManAndNum(p), Count );
+    Abc_PrintTime( 1, "Time", Abc_Clock() - clk );
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
+ABC_NAMESPACE_IMPL_END
+