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/**CFile****************************************************************
FileName [bbrNtbdd.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [BDD-based reachability analysis.]
Synopsis [Procedures to construct global BDDs for the network.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: bbrNtbdd.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "bbr.h"
//#include "bar.h"
ABC_NAMESPACE_IMPL_START
typedef char ProgressBar;
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
static inline void Aig_ObjSetGlobalBdd( Aig_Obj_t * pObj, DdNode * bFunc ) { pObj->pData = bFunc; }
static inline void Aig_ObjCleanGlobalBdd( DdManager * dd, Aig_Obj_t * pObj ) { Cudd_RecursiveDeref( dd, (DdNode *)pObj->pData ); pObj->pData = NULL; }
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Derives the global BDD for one AIG node.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
DdNode * Bbr_NodeGlobalBdds_rec( DdManager * dd, Aig_Obj_t * pNode, int nBddSizeMax, int fDropInternal, ProgressBar * pProgress, int * pCounter, int fVerbose )
{
DdNode * bFunc, * bFunc0, * bFunc1;
assert( !Aig_IsComplement(pNode) );
if ( Cudd_ReadKeys(dd)-Cudd_ReadDead(dd) > (unsigned)nBddSizeMax )
{
// Extra_ProgressBarStop( pProgress );
if ( fVerbose )
printf( "The number of live nodes reached %d.\n", nBddSizeMax );
fflush( stdout );
return NULL;
}
// if the result is available return
if ( Aig_ObjGlobalBdd(pNode) == NULL )
{
// compute the result for both branches
bFunc0 = Bbr_NodeGlobalBdds_rec( dd, Aig_ObjFanin0(pNode), nBddSizeMax, fDropInternal, pProgress, pCounter, fVerbose );
if ( bFunc0 == NULL )
return NULL;
Cudd_Ref( bFunc0 );
bFunc1 = Bbr_NodeGlobalBdds_rec( dd, Aig_ObjFanin1(pNode), nBddSizeMax, fDropInternal, pProgress, pCounter, fVerbose );
if ( bFunc1 == NULL )
return NULL;
Cudd_Ref( bFunc1 );
bFunc0 = Cudd_NotCond( bFunc0, Aig_ObjFaninC0(pNode) );
bFunc1 = Cudd_NotCond( bFunc1, Aig_ObjFaninC1(pNode) );
// get the final result
bFunc = Cudd_bddAnd( dd, bFunc0, bFunc1 ); Cudd_Ref( bFunc );
Cudd_RecursiveDeref( dd, bFunc0 );
Cudd_RecursiveDeref( dd, bFunc1 );
// add the number of used nodes
(*pCounter)++;
// set the result
assert( Aig_ObjGlobalBdd(pNode) == NULL );
Aig_ObjSetGlobalBdd( pNode, bFunc );
// increment the progress bar
// if ( pProgress )
// Extra_ProgressBarUpdate( pProgress, *pCounter, NULL );
}
// prepare the return value
bFunc = Aig_ObjGlobalBdd(pNode);
// dereference BDD at the node
if ( --pNode->nRefs == 0 && fDropInternal )
{
Cudd_Deref( bFunc );
Aig_ObjSetGlobalBdd( pNode, NULL );
}
return bFunc;
}
/**Function*************************************************************
Synopsis [Frees the global BDDs of the network.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_ManFreeGlobalBdds( Aig_Man_t * p, DdManager * dd )
{
Aig_Obj_t * pObj;
int i;
Aig_ManForEachObj( p, pObj, i )
if ( Aig_ObjGlobalBdd(pObj) )
Aig_ObjCleanGlobalBdd( dd, pObj );
}
/**Function*************************************************************
Synopsis [Returns the shared size of global BDDs of the COs.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Aig_ManSizeOfGlobalBdds( Aig_Man_t * p )
{
Vec_Ptr_t * vFuncsGlob;
Aig_Obj_t * pObj;
int RetValue, i;
// complement the global functions
vFuncsGlob = Vec_PtrAlloc( Aig_ManPoNum(p) );
Aig_ManForEachPo( p, pObj, i )
Vec_PtrPush( vFuncsGlob, Aig_ObjGlobalBdd(pObj) );
RetValue = Cudd_SharingSize( (DdNode **)Vec_PtrArray(vFuncsGlob), Vec_PtrSize(vFuncsGlob) );
Vec_PtrFree( vFuncsGlob );
return RetValue;
}
/**Function*************************************************************
Synopsis [Recursively computes global BDDs for the AIG in the manager.]
Description [On exit, BDDs are stored in the pNode->pData fields.]
SideEffects []
SeeAlso []
***********************************************************************/
DdManager * Aig_ManComputeGlobalBdds( Aig_Man_t * p, int nBddSizeMax, int fDropInternal, int fReorder, int fVerbose )
{
ProgressBar * pProgress = NULL;
Aig_Obj_t * pObj;
DdManager * dd;
DdNode * bFunc;
int i, Counter;
// start the manager
dd = Cudd_Init( Aig_ManPiNum(p), 0, CUDD_UNIQUE_SLOTS, CUDD_CACHE_SLOTS, 0 );
// set reordering
if ( fReorder )
Cudd_AutodynEnable( dd, CUDD_REORDER_SYMM_SIFT );
// prepare to construct global BDDs
Aig_ManCleanData( p );
// assign the constant node BDD
Aig_ObjSetGlobalBdd( Aig_ManConst1(p), dd->one ); Cudd_Ref( dd->one );
// set the elementary variables
Aig_ManForEachPi( p, pObj, i )
{
Aig_ObjSetGlobalBdd( pObj, dd->vars[i] ); Cudd_Ref( dd->vars[i] );
}
// collect the global functions of the COs
Counter = 0;
// construct the BDDs
// pProgress = Extra_ProgressBarStart( stdout, Aig_ManNodeNum(p) );
Aig_ManForEachPo( p, pObj, i )
{
bFunc = Bbr_NodeGlobalBdds_rec( dd, Aig_ObjFanin0(pObj), nBddSizeMax, fDropInternal, pProgress, &Counter, fVerbose );
if ( bFunc == NULL )
{
if ( fVerbose )
printf( "Constructing global BDDs is aborted.\n" );
Aig_ManFreeGlobalBdds( p, dd );
Cudd_Quit( dd );
// reset references
Aig_ManResetRefs( p );
return NULL;
}
bFunc = Cudd_NotCond( bFunc, Aig_ObjFaninC0(pObj) ); Cudd_Ref( bFunc );
Aig_ObjSetGlobalBdd( pObj, bFunc );
}
// Extra_ProgressBarStop( pProgress );
// reset references
Aig_ManResetRefs( p );
// reorder one more time
if ( fReorder )
{
Cudd_ReduceHeap( dd, CUDD_REORDER_SYMM_SIFT, 1 );
Cudd_AutodynDisable( dd );
}
// Cudd_PrintInfo( dd, stdout );
return dd;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
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