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/**CFile****************************************************************
FileName [ivyBalance.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [And-Inverter Graph package.]
Synopsis [Algebraic AIG balancing.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - May 11, 2006.]
Revision [$Id: ivyBalance.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
***********************************************************************/
#include "ivy.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
static int Ivy_NodeBalance_rec( Ivy_Man_t * pNew, Ivy_Obj_t * pObj, Vec_Vec_t * vStore, int Level, int fUpdateLevel );
static Vec_Ptr_t * Ivy_NodeBalanceCone( Ivy_Obj_t * pObj, Vec_Vec_t * vStore, int Level );
static int Ivy_NodeBalanceFindLeft( Vec_Ptr_t * vSuper );
static void Ivy_NodeBalancePermute( Ivy_Man_t * p, Vec_Ptr_t * vSuper, int LeftBound, int fExor );
static void Ivy_NodeBalancePushUniqueOrderByLevel( Vec_Ptr_t * vStore, Ivy_Obj_t * pObj );
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Performs algebraic balancing of the AIG.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Ivy_Man_t * Ivy_ManBalance( Ivy_Man_t * p, int fUpdateLevel )
{
Ivy_Man_t * pNew;
Ivy_Obj_t * pObj, * pDriver;
Vec_Vec_t * vStore;
int i, NewNodeId;
// clean the old manager
Ivy_ManCleanTravId( p );
// create the new manager
pNew = Ivy_ManStart();
// map the nodes
Ivy_ManConst1(p)->TravId = Ivy_EdgeFromNode( Ivy_ManConst1(pNew) );
Ivy_ManForEachPi( p, pObj, i )
pObj->TravId = Ivy_EdgeFromNode( Ivy_ObjCreatePi(pNew) );
// if HAIG is defined, trasfer the pointers to the PIs/latches
// if ( p->pHaig )
// Ivy_ManHaigTrasfer( p, pNew );
// balance the AIG
vStore = Vec_VecAlloc( 50 );
Ivy_ManForEachPo( p, pObj, i )
{
pDriver = Ivy_ObjReal( Ivy_ObjChild0(pObj) );
NewNodeId = Ivy_NodeBalance_rec( pNew, Ivy_Regular(pDriver), vStore, 0, fUpdateLevel );
NewNodeId = Ivy_EdgeNotCond( NewNodeId, Ivy_IsComplement(pDriver) );
Ivy_ObjCreatePo( pNew, Ivy_EdgeToNode(pNew, NewNodeId) );
}
Vec_VecFree( vStore );
if ( (i = Ivy_ManCleanup( pNew )) )
{
// printf( "Cleanup after balancing removed %d dangling nodes.\n", i );
}
// check the resulting AIG
if ( !Ivy_ManCheck(pNew) )
printf( "Ivy_ManBalance(): The check has failed.\n" );
return pNew;
}
/**Function*************************************************************
Synopsis [Procedure used for sorting the nodes in decreasing order of levels.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Ivy_NodeCompareLevelsDecrease( Ivy_Obj_t ** pp1, Ivy_Obj_t ** pp2 )
{
int Diff = Ivy_Regular(*pp1)->Level - Ivy_Regular(*pp2)->Level;
if ( Diff > 0 )
return -1;
if ( Diff < 0 )
return 1;
Diff = Ivy_Regular(*pp1)->Id - Ivy_Regular(*pp2)->Id;
if ( Diff > 0 )
return -1;
if ( Diff < 0 )
return 1;
return 0;
}
/**Function*************************************************************
Synopsis [Returns the ID of new node constructed.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Ivy_NodeBalance_rec( Ivy_Man_t * pNew, Ivy_Obj_t * pObjOld, Vec_Vec_t * vStore, int Level, int fUpdateLevel )
{
Ivy_Obj_t * pObjNew;
Vec_Ptr_t * vSuper;
int i, NewNodeId;
assert( !Ivy_IsComplement(pObjOld) );
assert( !Ivy_ObjIsBuf(pObjOld) );
// return if the result is known
if ( Ivy_ObjIsConst1(pObjOld) )
return pObjOld->TravId;
if ( pObjOld->TravId )
return pObjOld->TravId;
assert( Ivy_ObjIsNode(pObjOld) );
// get the implication supergate
vSuper = Ivy_NodeBalanceCone( pObjOld, vStore, Level );
if ( vSuper->nSize == 0 )
{ // it means that the supergate contains two nodes in the opposite polarity
pObjOld->TravId = Ivy_EdgeFromNode( Ivy_ManConst0(pNew) );
return pObjOld->TravId;
}
if ( vSuper->nSize < 2 )
printf( "BUG!\n" );
// for each old node, derive the new well-balanced node
for ( i = 0; i < vSuper->nSize; i++ )
{
NewNodeId = Ivy_NodeBalance_rec( pNew, Ivy_Regular((Ivy_Obj_t *)vSuper->pArray[i]), vStore, Level + 1, fUpdateLevel );
NewNodeId = Ivy_EdgeNotCond( NewNodeId, Ivy_IsComplement((Ivy_Obj_t *)vSuper->pArray[i]) );
vSuper->pArray[i] = Ivy_EdgeToNode( pNew, NewNodeId );
}
// build the supergate
pObjNew = Ivy_NodeBalanceBuildSuper( pNew, vSuper, Ivy_ObjType(pObjOld), fUpdateLevel );
vSuper->nSize = 0;
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