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|
/**CFile****************************************************************
FileName [aigRepr.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [AIG package.]
Synopsis [Handing node representatives.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - April 28, 2007.]
Revision [$Id: aigRepr.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
***********************************************************************/
#include "aig.h"
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Starts the array of representatives.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_ManReprStart( Aig_Man_t * p, int nIdMax )
{
assert( Aig_ManBufNum(p) == 0 );
assert( p->pReprs == NULL );
p->nReprsAlloc = nIdMax;
p->pReprs = ALLOC( Aig_Obj_t *, p->nReprsAlloc );
memset( p->pReprs, 0, sizeof(Aig_Obj_t *) * p->nReprsAlloc );
}
/**Function*************************************************************
Synopsis [Stop the array of representatives.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_ManReprStop( Aig_Man_t * p )
{
assert( p->pReprs != NULL );
FREE( p->pReprs );
p->nReprsAlloc = 0;
}
/**Function*************************************************************
Synopsis [Set the representative.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_ObjCreateRepr( Aig_Man_t * p, Aig_Obj_t * pNode1, Aig_Obj_t * pNode2 )
{
assert( p->pReprs != NULL );
assert( !Aig_IsComplement(pNode1) );
assert( !Aig_IsComplement(pNode2) );
assert( pNode1->Id < p->nReprsAlloc );
assert( pNode2->Id < p->nReprsAlloc );
assert( pNode1->Id < pNode2->Id );
p->pReprs[pNode2->Id] = pNode1;
}
/**Function*************************************************************
Synopsis [Set the representative.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline void Aig_ObjSetRepr( Aig_Man_t * p, Aig_Obj_t * pNode1, Aig_Obj_t * pNode2 )
{
assert( p->pReprs != NULL );
assert( !Aig_IsComplement(pNode1) );
assert( !Aig_IsComplement(pNode2) );
assert( pNode1->Id < p->nReprsAlloc );
assert( pNode2->Id < p->nReprsAlloc );
if ( pNode1 == pNode2 )
return;
if ( pNode1->Id < pNode2->Id )
p->pReprs[pNode2->Id] = pNode1;
else
p->pReprs[pNode1->Id] = pNode2;
}
/**Function*************************************************************
Synopsis [Find representative.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline Aig_Obj_t * Aig_ObjFindRepr( Aig_Man_t * p, Aig_Obj_t * pNode )
{
assert( p->pReprs != NULL );
assert( !Aig_IsComplement(pNode) );
assert( pNode->Id < p->nReprsAlloc );
// assert( !p->pReprs[pNode->Id] || p->pReprs[pNode->Id]->Id < pNode->Id );
return p->pReprs[pNode->Id];
}
/**Function*************************************************************
Synopsis [Clears the representative.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline void Aig_ObjClearRepr( Aig_Man_t * p, Aig_Obj_t * pNode )
{
assert( p->pReprs != NULL );
assert( !Aig_IsComplement(pNode) );
assert( pNode->Id < p->nReprsAlloc );
p->pReprs[pNode->Id] = NULL;
}
/**Function*************************************************************
Synopsis [Find representative transitively.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline Aig_Obj_t * Aig_ObjFindReprTransitive( Aig_Man_t * p, Aig_Obj_t * pNode )
{
Aig_Obj_t * pNext, * pRepr;
if ( (pRepr = Aig_ObjFindRepr(p, pNode)) )
while ( (pNext = Aig_ObjFindRepr(p, pRepr)) )
pRepr = pNext;
return pRepr;
}
/**Function*************************************************************
Synopsis [Returns representatives of fanin in approapriate polarity.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline Aig_Obj_t * Aig_ObjRepr( Aig_Man_t * p, Aig_Obj_t * pObj )
{
Aig_Obj_t * pRepr;
if ( (pRepr = Aig_ObjFindRepr(p, pObj)) )
return Aig_NotCond( pRepr->pData, pObj->fPhase ^ pRepr->fPhase );
return pObj->pData;
}
static inline Aig_Obj_t * Aig_ObjChild0Repr( Aig_Man_t * p, Aig_Obj_t * pObj ) { return Aig_NotCond( Aig_ObjRepr(p, Aig_ObjFanin0(pObj)), Aig_ObjFaninC0(pObj) ); }
static inline Aig_Obj_t * Aig_ObjChild1Repr( Aig_Man_t * p, Aig_Obj_t * pObj ) { return Aig_NotCond( Aig_ObjRepr(p, Aig_ObjFanin1(pObj)), Aig_ObjFaninC1(pObj) ); }
/**Function*************************************************************
Synopsis [Duplicates AIG while substituting representatives.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_ManTransferRepr( Aig_Man_t * pNew, Aig_Man_t * pOld )
{
Aig_Obj_t * pObj, * pRepr;
int k;
assert( pNew->pReprs != NULL );
// extend storage to fix pNew
if ( pNew->nReprsAlloc < Aig_ManObjNumMax(pNew) )
{
int nReprsAllocNew = 2 * Aig_ManObjNumMax(pNew);
pNew->pReprs = REALLOC( Aig_Obj_t *, pNew->pReprs, nReprsAllocNew );
memset( pNew->pReprs + pNew->nReprsAlloc, 0, sizeof(Aig_Obj_t *) * (nReprsAllocNew-pNew->nReprsAlloc) );
pNew->nReprsAlloc = nReprsAllocNew;
}
// go through the nodes which have representatives
Aig_ManForEachObj( pOld, pObj, k )
if ( (pRepr = Aig_ObjFindRepr(pOld, pObj)) )
Aig_ObjSetRepr( pNew, Aig_Regular(pRepr->pData), Aig_Regular(pObj->pData) );
}
/**Function*************************************************************
Synopsis [Duplicates the AIG manager recursively.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Aig_Obj_t * Aig_ManDupRepr_rec( Aig_Man_t * pNew, Aig_Man_t * p, Aig_Obj_t * pObj )
{
Aig_Obj_t * pRepr;
if ( pObj->pData )
return pObj->pData;
if ( (pRepr = Aig_ObjFindRepr(p, pObj)) )
{
Aig_ManDupRepr_rec( pNew, p, pRepr );
return pObj->pData = Aig_NotCond( pRepr->pData, pRepr->fPhase ^ pObj->fPhase );
}
Aig_ManDupRepr_rec( pNew, p, Aig_ObjFanin0(pObj) );
Aig_ManDupRepr_rec( pNew, p, Aig_ObjFanin1(pObj) );
return pObj->pData = Aig_And( pNew, Aig_ObjChild0Repr(p, pObj), Aig_ObjChild1Repr(p, pObj) );
}
/**Function*************************************************************
Synopsis [Duplicates AIG while substituting representatives.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Aig_Man_t * Aig_ManDupRepr( Aig_Man_t * p, int fOrdered )
{
Aig_Man_t * pNew;
Aig_Obj_t * pObj;
int i;
// start the HOP package
pNew = Aig_ManStart( Aig_ManObjNumMax(p) );
pNew->pName = Aig_UtilStrsav( p->pName );
pNew->nRegs = p->nRegs;
if ( p->vFlopNums )
pNew->vFlopNums = Vec_IntDup( p->vFlopNums );
// map the const and primary inputs
Aig_ManCleanData( p );
Aig_ManConst1(p)->pData = Aig_ManConst1(pNew);
Aig_ManForEachPi( p, pObj, i )
pObj->pData = Aig_ObjCreatePi(pNew);
// map the internal nodes
if ( fOrdered )
{
Aig_ManForEachNode( p, pObj, i )
pObj->pData = Aig_And( pNew, Aig_ObjChild0Repr(p, pObj), Aig_ObjChild1Repr(p, pObj) );
}
else
{
Aig_ManForEachPo( p, pObj, i )
Aig_ManDupRepr_rec( pNew, p, Aig_ObjFanin0(pObj) );
}
// transfer the POs
Aig_ManForEachPo( p, pObj, i )
Aig_ObjCreatePo( pNew, Aig_ObjChild0Repr(p, pObj) );
// check the new manager
if ( !Aig_ManCheck(pNew) )
printf( "Aig_ManDupRepr: Check has failed.\n" );
return pNew;
}
/**Function*************************************************************
Synopsis [Transfer representatives and return the number of critical fanouts.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Aig_ManRemapRepr( Aig_Man_t * p )
{
Aig_Obj_t * pObj, * pRepr;
int i, nFanouts = 0;
Aig_ManForEachNode( p, pObj, i )
{
pRepr = Aig_ObjFindReprTransitive( p, pObj );
if ( pRepr == NULL )
continue;
assert( pRepr->Id < pObj->Id );
Aig_ObjSetRepr( p, pObj, pRepr );
nFanouts += (pObj->nRefs > 0);
}
return nFanouts;
}
/**Function*************************************************************
Synopsis [Returns 1 if pOld is in the TFI of pNew.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Aig_ObjCheckTfi_rec( Aig_Man_t * p, Aig_Obj_t * pNode, Aig_Obj_t * pOld )
{
// check the trivial cases
if ( pNode == NULL )
return 0;
// if ( pNode->Id < pOld->Id ) // cannot use because of choices of pNode
// return 0;
if ( pNode == pOld )
return 1;
// skip the visited node
if ( Aig_ObjIsTravIdCurrent( p, pNode ) )
return 0;
Aig_ObjSetTravIdCurrent( p, pNode );
// check the children
if ( Aig_ObjCheckTfi_rec( p, Aig_ObjFanin0(pNode), pOld ) )
return 1;
if ( Aig_ObjCheckTfi_rec( p, Aig_ObjFanin1(pNode), pOld ) )
return 1;
// check equivalent nodes
return Aig_ObjCheckTfi_rec( p, p->pEquivs[pNode->Id], pOld );
}
/**Function*************************************************************
Synopsis [Returns 1 if pOld is in the TFI of pNew.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Aig_ObjCheckTfi( Aig_Man_t * p, Aig_Obj_t * pNew, Aig_Obj_t * pOld )
{
assert( !Aig_IsComplement(pNew) );
assert( !Aig_IsComplement(pOld) );
Aig_ManIncrementTravId( p );
return Aig_ObjCheckTfi_rec( p, pNew, pOld );
}
/**Function*************************************************************
Synopsis [Iteratively rehashes the AIG.]
Description [The input AIG is assumed to have representatives assigned.]
SideEffects []
SeeAlso []
***********************************************************************/
Aig_Man_t * Aig_ManRehash( Aig_Man_t * p )
{
Aig_Man_t * pTemp;
int i, nFanouts;
assert( p->pReprs != NULL );
for ( i = 0; (nFanouts = Aig_ManRemapRepr( p )); i++ )
{
// printf( "Iter = %3d. Fanouts = %6d. Nodes = %7d.\n", i+1, nFanouts, Aig_ManNodeNum(p) );
p = Aig_ManDupRepr( pTemp = p, 1 );
Aig_ManReprStart( p, Aig_ManObjNumMax(p) );
Aig_ManTransferRepr( p, pTemp );
Aig_ManStop( pTemp );
}
return p;
}
/**Function*************************************************************
Synopsis [Marks the nodes that are Creates choices.]
Description [The input AIG is assumed to have representatives assigned.]
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_ManMarkValidChoices( Aig_Man_t * p )
{
Aig_Obj_t * pObj, * pRepr;
int i;
assert( p->pReprs != NULL );
// create equivalent nodes in the manager
assert( p->pEquivs == NULL );
p->pEquivs = ALLOC( Aig_Obj_t *, Aig_ManObjNumMax(p) );
memset( p->pEquivs, 0, sizeof(Aig_Obj_t *) * Aig_ManObjNumMax(p) );
// make the choice nodes
Aig_ManForEachNode( p, pObj, i )
{
pRepr = Aig_ObjFindRepr( p, pObj );
if ( pRepr == NULL )
continue;
assert( pObj->nRefs == 0 );
// skip constant and PI classes
if ( !Aig_ObjIsNode(pRepr) )
{
Aig_ObjClearRepr( p, pObj );
continue;
}
// skip choices with combinatinal loops
if ( Aig_ObjCheckTfi( p, pObj, pRepr ) )
{
Aig_ObjClearRepr( p, pObj );
continue;
}
//printf( "Node %d is represented by node %d.\n", pObj->Id, pRepr->Id );
// add choice to the choice node
p->pEquivs[pObj->Id] = p->pEquivs[pRepr->Id];
p->pEquivs[pRepr->Id] = pObj;
}
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
|
