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/**CFile****************************************************************
FileName [aigFanout.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [AIG package.]
Synopsis [Fanout manipulation.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - April 28, 2007.]
Revision [$Id: aigFanout.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
***********************************************************************/
#include "aig.h"
ABC_NAMESPACE_IMPL_START
// 0: first iFan
// 1: prev iFan0
// 2: prev iFan1
// 3: next iFan0
// 4: next iFan1
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
static inline int Aig_FanoutCreate( int FanId, int Num ) { assert( Num < 2 ); return (FanId << 1) | Num; }
static inline int * Aig_FanoutObj( int * pData, int ObjId ) { return pData + 5*ObjId; }
static inline int * Aig_FanoutPrev( int * pData, int iFan ) { return pData + 5*(iFan >> 1) + 1 + (iFan & 1); }
static inline int * Aig_FanoutNext( int * pData, int iFan ) { return pData + 5*(iFan >> 1) + 3 + (iFan & 1); }
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Create fanout for all objects in the manager.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_ManFanoutStart( Aig_Man_t * p )
{
Aig_Obj_t * pObj;
int i;
assert( Aig_ManBufNum(p) == 0 );
// allocate fanout datastructure
assert( p->pFanData == NULL );
p->nFansAlloc = 2 * Aig_ManObjNumMax(p);
if ( p->nFansAlloc < (1<<12) )
p->nFansAlloc = (1<<12);
p->pFanData = ABC_ALLOC( int, 5 * p->nFansAlloc );
memset( p->pFanData, 0, sizeof(int) * 5 * p->nFansAlloc );
// add fanouts for all objects
Aig_ManForEachObj( p, pObj, i )
{
if ( Aig_ObjChild0(pObj) )
Aig_ObjAddFanout( p, Aig_ObjFanin0(pObj), pObj );
if ( Aig_ObjChild1(pObj) )
Aig_ObjAddFanout( p, Aig_ObjFanin1(pObj), pObj );
}
}
/**Function*************************************************************
Synopsis [Deletes fanout for all objects in the manager.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_ManFanoutStop( Aig_Man_t * p )
{
assert( p->pFanData != NULL );
ABC_FREE( p->pFanData );
p->nFansAlloc = 0;
}
/**Function*************************************************************
Synopsis [Adds fanout (pFanout) of node (pObj).]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_ObjAddFanout( Aig_Man_t * p, Aig_Obj_t * pObj, Aig_Obj_t * pFanout )
{
int iFan, * pFirst, * pPrevC, * pNextC, * pPrev, * pNext;
assert( p->pFanData );
assert( !Aig_IsComplement(pObj) && !Aig_IsComplement(pFanout) );
assert( pFanout->Id > 0 );
if ( pObj->Id >= p->nFansAlloc || pFanout->Id >= p->nFansAlloc )
{
int nFansAlloc = 2 * ABC_MAX( pObj->Id, pFanout->Id );
p->pFanData = ABC_REALLOC( int, p->pFanData, 5 * nFansAlloc );
memset( p->pFanData + 5 * p->nFansAlloc, 0, sizeof(int) * 5 * (nFansAlloc - p->nFansAlloc) );
p->nFansAlloc = nFansAlloc;
}
assert( pObj->Id < p->nFansAlloc && pFanout->Id < p->nFansAlloc );
iFan = Aig_FanoutCreate( pFanout->Id, Aig_ObjWhatFanin(pFanout, pObj) );
pPrevC = Aig_FanoutPrev( p->pFanData, iFan );
pNextC = Aig_FanoutNext( p->pFanData, iFan );
pFirst = Aig_FanoutObj( p->pFanData, pObj->Id );
if ( *pFirst == 0 )
{
*pFirst = iFan;
*pPrevC = iFan;
*pNextC = iFan;
}
else
{
pPrev = Aig_FanoutPrev( p->pFanData, *pFirst );
pNext = Aig_FanoutNext( p->pFanData, *pPrev );
assert( *pNext == *pFirst );
*pPrevC = *pPrev;
*pNextC = *pFirst;
*pPrev = iFan;
*pNext = iFan;
}
}
/**Function*************************************************************
Synopsis [Removes fanout (pFanout) of node (pObj).]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_ObjRemoveFanout( Aig_Man_t * p, Aig_Obj_t * pObj, Aig_Obj_t * pFanout )
{
int iFan, * pFirst, * pPrevC, * pNextC, * pPrev, * pNext;
assert( p->pFanData && pObj->Id < p->nFansAlloc && pFanout->Id < p->nFansAlloc );
assert( !Aig_IsComplement(pObj) && !Aig_IsComplement(pFanout) );
assert( pFanout->Id > 0 );
iFan = Aig_FanoutCreate( pFanout->Id, Aig_ObjWhatFanin(pFanout, pObj) );
pPrevC = Aig_FanoutPrev( p->pFanData, iFan );
pNextC = Aig_FanoutNext( p->pFanData, iFan );
pPrev = Aig_FanoutPrev( p->pFanData, *pNextC );
pNext = Aig_FanoutNext( p->pFanData, *pPrevC );
assert( *pPrev == iFan );
assert( *pNext == iFan );
pFirst = Aig_FanoutObj( p->pFanData, pObj->Id );
assert( *pFirst > 0 );
if ( *pFirst == iFan )
{
if ( *pNextC == iFan )
{
*pFirst = 0;
*pPrev = 0;
*pNext = 0;
*pPrevC = 0;
*pNextC = 0;
return;
}
*pFirst = *pNextC;
}
*pPrev = *pPrevC;
*pNext = *pNextC;
*pPrevC = 0;
*pNextC = 0;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
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