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/**CFile****************************************************************
FileName [llb2Bad.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [BDD based reachability.]
Synopsis [Computing bad states.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: llb2Bad.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "llbInt.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Computes bad in working manager.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
DdNode * Llb_BddComputeBad( Aig_Man_t * pInit, DdManager * dd )
{
Vec_Ptr_t * vNodes;
DdNode * bBdd0, * bBdd1, * bTemp, * bResult;
Aig_Obj_t * pObj;
int i;
assert( Cudd_ReadSize(dd) == Aig_ManPiNum(pInit) );
// initialize elementary variables
Aig_ManConst1(pInit)->pData = Cudd_ReadOne( dd );
Saig_ManForEachLo( pInit, pObj, i )
pObj->pData = Cudd_bddIthVar( dd, i );
Saig_ManForEachPi( pInit, pObj, i )
pObj->pData = Cudd_bddIthVar( dd, Aig_ManRegNum(pInit) + i );
// compute internal nodes
vNodes = Aig_ManDfsNodes( pInit, (Aig_Obj_t **)Vec_PtrArray(pInit->vPos), Saig_ManPoNum(pInit) );
Vec_PtrForEachEntry( Aig_Obj_t *, vNodes, pObj, i )
{
if ( !Aig_ObjIsNode(pObj) )
continue;
bBdd0 = Cudd_NotCond( (DdNode *)Aig_ObjFanin0(pObj)->pData, Aig_ObjFaninC0(pObj) );
bBdd1 = Cudd_NotCond( (DdNode *)Aig_ObjFanin1(pObj)->pData, Aig_ObjFaninC1(pObj) );
pObj->pData = Cudd_bddAnd( dd, bBdd0, bBdd1 ); Cudd_Ref( (DdNode *)pObj->pData );
}
// quantify PIs of each PO
bResult = Cudd_ReadLogicZero( dd ); Cudd_Ref( bResult );
Saig_ManForEachPo( pInit, pObj, i )
{
bBdd0 = Cudd_NotCond( Aig_ObjFanin0(pObj)->pData, Aig_ObjFaninC0(pObj) );
bResult = Cudd_bddOr( dd, bTemp = bResult, bBdd0 ); Cudd_Ref( bResult );
Cudd_RecursiveDeref( dd, bTemp );
}
// deref
Vec_PtrForEachEntry( Aig_Obj_t *, vNodes, pObj, i )
{
if ( !Aig_ObjIsNode(pObj) )
continue;
Cudd_RecursiveDeref( dd, pObj->pData );
}
Vec_PtrFree( vNodes );
Cudd_Deref( bResult );
return bResult;
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
DdNode * Llb_BddQuantifyPis( Aig_Man_t * pInit, DdManager * dd, DdNode * bFunc )
{
DdNode * bVar, * bCube, * bTemp;
Aig_Obj_t * pObj;
int i;
assert( Cudd_ReadSize(dd) == Aig_ManPiNum(pInit) );
// create PI cube
bCube = Cudd_ReadOne( dd ); Cudd_Ref( bCube );
Saig_ManForEachPi( pInit, pObj, i )
{
bVar = Cudd_bddIthVar( dd, Aig_ManRegNum(pInit) + i );
bCube = Cudd_bddAnd( dd, bTemp = bCube, bVar ); Cudd_Ref( bCube );
Cudd_RecursiveDeref( dd, bTemp );
}
// quantify PI cube
bFunc = Cudd_bddExistAbstract( dd, bFunc, bCube ); Cudd_Ref( bFunc );
Cudd_RecursiveDeref( dd, bCube );
Cudd_Deref( bFunc );
return bFunc;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
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