mirror of https://github.com/YosysHQ/abc.git
138 lines
4.5 KiB
C
138 lines
4.5 KiB
C
/**CFile****************************************************************
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FileName [llb2Bad.c]
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SystemName [ABC: Logic synthesis and verification system.]
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PackageName [BDD based reachability.]
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Synopsis [Computing bad states.]
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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: llb2Bad.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
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***********************************************************************/
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#include "llbInt.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 [Computes bad in working manager.]
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Description []
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SideEffects []
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SeeAlso []
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***********************************************************************/
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DdNode * Llb_BddComputeBad( Aig_Man_t * pInit, DdManager * dd, int TimeOut )
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{
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Vec_Ptr_t * vNodes;
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DdNode * bBdd0, * bBdd1, * bTemp, * bResult;
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Aig_Obj_t * pObj;
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int i, k;
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assert( Cudd_ReadSize(dd) == Aig_ManCiNum(pInit) );
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// initialize elementary variables
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Aig_ManConst1(pInit)->pData = Cudd_ReadOne( dd );
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Saig_ManForEachLo( pInit, pObj, i )
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pObj->pData = Cudd_bddIthVar( dd, i );
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Saig_ManForEachPi( pInit, pObj, i )
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pObj->pData = Cudd_bddIthVar( dd, Aig_ManRegNum(pInit) + i );
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// compute internal nodes
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vNodes = Aig_ManDfsNodes( pInit, (Aig_Obj_t **)Vec_PtrArray(pInit->vCos), Saig_ManPoNum(pInit) );
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Vec_PtrForEachEntry( Aig_Obj_t *, vNodes, pObj, i )
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{
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if ( !Aig_ObjIsNode(pObj) )
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continue;
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bBdd0 = Cudd_NotCond( (DdNode *)Aig_ObjFanin0(pObj)->pData, Aig_ObjFaninC0(pObj) );
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bBdd1 = Cudd_NotCond( (DdNode *)Aig_ObjFanin1(pObj)->pData, Aig_ObjFaninC1(pObj) );
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// pObj->pData = Extra_bddAndTime( dd, bBdd0, bBdd1, TimeOut );
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pObj->pData = Cudd_bddAnd( dd, bBdd0, bBdd1 );
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if ( pObj->pData == NULL )
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{
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Vec_PtrForEachEntryStop( Aig_Obj_t *, vNodes, pObj, k, i )
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if ( pObj->pData )
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Cudd_RecursiveDeref( dd, (DdNode *)pObj->pData );
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Vec_PtrFree( vNodes );
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return NULL;
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}
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Cudd_Ref( (DdNode *)pObj->pData );
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}
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// quantify PIs of each PO
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bResult = Cudd_ReadLogicZero( dd ); Cudd_Ref( bResult );
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Saig_ManForEachPo( pInit, pObj, i )
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{
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bBdd0 = Cudd_NotCond( Aig_ObjFanin0(pObj)->pData, Aig_ObjFaninC0(pObj) );
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bResult = Cudd_bddOr( dd, bTemp = bResult, bBdd0 ); Cudd_Ref( bResult );
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Cudd_RecursiveDeref( dd, bTemp );
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}
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// deref
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Vec_PtrForEachEntry( Aig_Obj_t *, vNodes, pObj, i )
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{
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if ( !Aig_ObjIsNode(pObj) )
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continue;
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Cudd_RecursiveDeref( dd, (DdNode *)pObj->pData );
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}
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Vec_PtrFree( vNodes );
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Cudd_Deref( bResult );
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return bResult;
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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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DdNode * Llb_BddQuantifyPis( Aig_Man_t * pInit, DdManager * dd, DdNode * bFunc )
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{
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DdNode * bVar, * bCube, * bTemp;
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Aig_Obj_t * pObj;
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int i, TimeStop;
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assert( Cudd_ReadSize(dd) == Aig_ManCiNum(pInit) );
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TimeStop = dd->TimeStop; dd->TimeStop = 0;
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// create PI cube
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bCube = Cudd_ReadOne( dd ); Cudd_Ref( bCube );
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Saig_ManForEachPi( pInit, pObj, i ) {
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bVar = Cudd_bddIthVar( dd, Aig_ManRegNum(pInit) + i );
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bCube = Cudd_bddAnd( dd, bTemp = bCube, bVar ); Cudd_Ref( bCube );
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Cudd_RecursiveDeref( dd, bTemp );
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}
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// quantify PI cube
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bFunc = Cudd_bddExistAbstract( dd, bFunc, bCube ); Cudd_Ref( bFunc );
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Cudd_RecursiveDeref( dd, bCube );
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Cudd_Deref( bFunc );
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dd->TimeStop = TimeStop;
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return bFunc;
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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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