mirror of https://github.com/YosysHQ/abc.git
Experiments with simulation.
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Alan Mishchenko
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30037e0653
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/**CFile****************************************************************
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FileName [cecSimBack.c]
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SystemName [ABC: Logic synthesis and verification system.]
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PackageName [Combinational equivalence checking.]
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Synopsis [Backward simulation.]
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Author [Alan Mishchenko]
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Affiliation [UC Berkeley]
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Date [Ver. 1.0. Started - June 20, 2005.]
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Revision [$Id: cecSimBack.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
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***********************************************************************/
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#include "cecInt.h"
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#include "aig/gia/giaAig.h"
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ABC_NAMESPACE_IMPL_START
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////////////////////////////////////////////////////////////////////////
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/// DECLARATIONS ///
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////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////
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/// FUNCTION DEFINITIONS ///
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////////////////////////////////////////////////////////////////////////
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/**Function*************************************************************
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Synopsis []
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Description []
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SideEffects []
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SeeAlso []
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***********************************************************************/
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int Cec_ObjSatVerify( Gia_Man_t * p, Gia_Obj_t * pRoot, int Value )
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{
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Gia_Obj_t * pObj;
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int i, RetValue = 1;
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printf( "Obj = %4d Value = %d ", Gia_ObjId(p, pRoot), Value );
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Gia_ObjTerSimSet0( Gia_ManConst0(p) );
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Gia_ManForEachCi( p, pObj, i )
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if ( !Gia_ObjIsTravIdCurrent(p, pObj) )
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Gia_ObjTerSimSetX( pObj ), printf( "x" );
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else if ( pObj->fMark0 )
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Gia_ObjTerSimSet1( pObj ), printf( "1" );
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else
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Gia_ObjTerSimSet0( pObj ), printf( "0" );
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printf( " " );
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Gia_ManForEachAnd( p, pObj, i )
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Gia_ObjTerSimAnd( pObj );
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if ( Value ? Gia_ObjTerSimGet1(pRoot) : Gia_ObjTerSimGet0(pRoot) )
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printf( "Verification successful.\n" );
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else
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printf( "Verification failed.\n" ), RetValue = 0;
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return RetValue;
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}
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/**Function*************************************************************
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Synopsis [Return 1 if pObj can have Value.]
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Description []
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SideEffects []
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SeeAlso []
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***********************************************************************/
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word Cec_ManCheckSat2_rec( Gia_Man_t * p, Gia_Obj_t * pObj, word Value, Vec_Wrd_t * vValues )
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{
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Gia_Obj_t * pFan0, * pFan1;
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if ( Gia_ObjIsTravIdCurrent(p, pObj) )
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return Value == (int)pObj->fMark0;
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Gia_ObjSetTravIdCurrent(p, pObj);
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pObj->fMark0 = Value;
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if ( !Gia_ObjIsAnd(pObj) )
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return 1;
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pFan0 = Gia_ObjFanin0(pObj);
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pFan1 = Gia_ObjFanin1(pObj);
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if ( Value )
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{
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return Cec_ManCheckSat2_rec( p, pFan0, !Gia_ObjFaninC0(pObj), vValues ) &&
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Cec_ManCheckSat2_rec( p, pFan1, !Gia_ObjFaninC1(pObj), vValues );
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}
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if ( Gia_ObjIsTravIdCurrent(p, pFan0) ) // already assigned
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{
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if ( Gia_ObjFaninC0(pObj) == (int)pFan0->fMark0 ) // justified
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return 1;
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return Cec_ManCheckSat2_rec( p, pFan1, Gia_ObjFaninC1(pObj), vValues );
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}
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if ( Gia_ObjIsTravIdCurrent(p, pFan1) ) // already assigned
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{
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if ( Gia_ObjFaninC1(pObj) == (int)pFan1->fMark0 ) // justified
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return 1;
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return Cec_ManCheckSat2_rec( p, pFan0, Gia_ObjFaninC0(pObj), vValues );
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}
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return Cec_ManCheckSat2_rec( p, pFan0, Gia_ObjFaninC0(pObj), vValues );
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}
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word Cec_ManCheckSat2( Gia_Man_t * p, Gia_Obj_t * pObj, int Value, Vec_Wrd_t * vValues )
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{
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return 0;
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}
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/**Function*************************************************************
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Synopsis [Return 1 if pObj can have Value.]
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Description []
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SideEffects []
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SeeAlso []
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***********************************************************************/
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int Cec_ManCheckSat_rec( Gia_Man_t * p, Gia_Obj_t * pObj, int Value )
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{
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Gia_Obj_t * pFan0, * pFan1;
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if ( Gia_ObjIsTravIdCurrent(p, pObj) )
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return Value == (int)pObj->fMark0;
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Gia_ObjSetTravIdCurrent(p, pObj);
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pObj->fMark0 = Value;
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if ( !Gia_ObjIsAnd(pObj) )
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return 1;
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pFan0 = Gia_ObjFanin0(pObj);
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pFan1 = Gia_ObjFanin1(pObj);
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if ( Value )
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{
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return Cec_ManCheckSat_rec( p, pFan0, !Gia_ObjFaninC0(pObj) ) &&
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Cec_ManCheckSat_rec( p, pFan1, !Gia_ObjFaninC1(pObj) );
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}
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if ( Gia_ObjIsTravIdCurrent(p, pFan0) ) // already assigned
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{
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if ( Gia_ObjFaninC0(pObj) == (int)pFan0->fMark0 ) // justified
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return 1;
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return Cec_ManCheckSat_rec( p, pFan1, Gia_ObjFaninC1(pObj) );
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}
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if ( Gia_ObjIsTravIdCurrent(p, pFan1) ) // already assigned
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{
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if ( Gia_ObjFaninC1(pObj) == (int)pFan1->fMark0 ) // justified
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return 1;
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return Cec_ManCheckSat_rec( p, pFan0, Gia_ObjFaninC0(pObj) );
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}
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return Cec_ManCheckSat_rec( p, pFan0, Gia_ObjFaninC0(pObj) );
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}
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void Cec_ManSimBack( Gia_Man_t * p )
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{
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abctime clk = Abc_Clock();
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Vec_Wrd_t * vValues = Vec_WrdStart( Gia_ManObjNum(p) );
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Gia_Obj_t * pObj;
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int i, Count = 0;
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word Res;
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Gia_ManSetPhase( p );
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//Gia_ManForEachAnd( p, pObj, i )
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// printf( "%d", pObj->fPhase );
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//printf( "\n" );
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//return;
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Gia_ManForEachAnd( p, pObj, i )
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{
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Gia_ManIncrementTravId(p);
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//Gia_ManCleanMark0( p );
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Res = Cec_ManCheckSat_rec( p, pObj, !pObj->fPhase );
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//if ( Res )
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// Cec_ObjSatVerify( p, pObj, !pObj->fPhase );
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//Res = Cec_ManCheckSat2_rec( p, pObj, !pObj->fPhase ? ~(word)0 : 0, vValues );
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//if ( Res )
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// Cec_ObjSatVerify2( p, pObj, !pObj->fPhase, Res );
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Count += (int)(Res > 0);
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}
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Vec_WrdFree( vValues );
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printf( "Obj = %6d. SAT = %6d. ", Gia_ManAndNum(p), Count );
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Abc_PrintTime( 1, "Time", Abc_Clock() - clk );
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}
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////////////////////////////////////////////////////////////////////////
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/// END OF FILE ///
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////////////////////////////////////////////////////////////////////////
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ABC_NAMESPACE_IMPL_END
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