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/**CFile****************************************************************
FileName [ntlUtil.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [Netlist representation.]
Synopsis [Various utilities.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: ntlUtil.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "ntl.h"
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Counts COs that are connected to the internal nodes through invs/bufs.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Ntl_ModelCountLut1( Ntl_Mod_t * pRoot )
{
Ntl_Obj_t * pObj;
int i, Counter = 0;
Ntl_ModelForEachNode( pRoot, pObj, i )
if ( Ntl_ObjFaninNum(pObj) == 1 )
Counter++;
return Counter;
}
/**Function*************************************************************
Synopsis [Connects COs to the internal nodes other than inv/bufs.]
Description [Should be called immediately after reading from file.]
SideEffects []
SeeAlso []
***********************************************************************/
int Ntl_ManCountSimpleCoDriversOne( Ntl_Net_t * pNetCo )
{
Ntl_Net_t * pNetFanin;
// skip the case when the net is not driven by a node
if ( !Ntl_ObjIsNode(pNetCo->pDriver) )
return 0;
// skip the case when the node is not an inv/buf
if ( Ntl_ObjFaninNum(pNetCo->pDriver) != 1 )
return 0;
// skip the case when the second-generation driver is not a node
pNetFanin = Ntl_ObjFanin0(pNetCo->pDriver);
if ( !Ntl_ObjIsNode(pNetFanin->pDriver) )
return 0;
return 1;
}
/**Function*************************************************************
Synopsis [Counts COs that are connected to the internal nodes through invs/bufs.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Ntl_ManCountSimpleCoDrivers( Ntl_Man_t * p )
{
Ntl_Net_t * pNetCo;
Ntl_Obj_t * pObj;
Ntl_Mod_t * pRoot;
int i, k, Counter;
Counter = 0;
pRoot = Ntl_ManRootModel( p );
Ntl_ModelForEachPo( pRoot, pObj, i )
Counter += Ntl_ManCountSimpleCoDriversOne( Ntl_ObjFanin0(pObj) );
Ntl_ModelForEachLatch( pRoot, pObj, i )
Counter += Ntl_ManCountSimpleCoDriversOne( Ntl_ObjFanin0(pObj) );
Ntl_ModelForEachBox( pRoot, pObj, i )
Ntl_ObjForEachFanin( pObj, pNetCo, k )
Counter += Ntl_ManCountSimpleCoDriversOne( pNetCo );
return Counter;
}
/**Function*************************************************************
Synopsis [Removes the CO drivers that are bufs/invs.]
Description [Should be called immediately after reading from file.]
SideEffects [This procedure does not work because the internal net
(pNetFanin) may have other drivers.]
SeeAlso []
***********************************************************************/
int Ntl_ManTransformCoDrivers( Ntl_Man_t * p )
{
Vec_Ptr_t * vCoNets;
Ntl_Net_t * pNetCo, * pNetFanin;
Ntl_Obj_t * pObj;
Ntl_Mod_t * pRoot;
int i, k, Counter;
pRoot = Ntl_ManRootModel( p );
// collect the nets of the root model
vCoNets = Vec_PtrAlloc( 1000 );
Ntl_ModelForEachPo( pRoot, pObj, i )
if ( !Ntl_ObjFanin0(pObj)->fMark )
{
Ntl_ObjFanin0(pObj)->fMark = 1;
Vec_PtrPush( vCoNets, Ntl_ObjFanin0(pObj) );
}
Ntl_ModelForEachLatch( pRoot, pObj, i )
if ( !Ntl_ObjFanin0(pObj)->fMark )
{
Ntl_ObjFanin0(pObj)->fMark = 1;
Vec_PtrPush( vCoNets, Ntl_ObjFanin0(pObj) );
}
Ntl_ModelForEachBox( pRoot, pObj, k )
Ntl_ObjForEachFanin( pObj, pNetCo, i )
if ( !pNetCo->fMark )
{
pNetCo->fMark = 1;
Vec_PtrPush( vCoNets, pNetCo );
}
// check the nets
Vec_PtrForEachEntry( vCoNets, pNetCo, i )
{
if ( !Ntl_ObjIsNode(pNetCo->pDriver) )
continue;
if ( Ntl_ObjFaninNum(pNetCo->pDriver) != 1 )
break;
pNetFanin = Ntl_ObjFanin0(pNetCo->pDriver);
if ( !Ntl_ObjIsNode(pNetFanin->pDriver) )
break;
}
if ( i < Vec_PtrSize(vCoNets) )
{
Vec_PtrFree( vCoNets );
return 0;
}
// remove the buffers/inverters
Counter = 0;
Vec_PtrForEachEntry( vCoNets, pNetCo, i )
{
pNetCo->fMark = 0;
if ( !Ntl_ObjIsNode(pNetCo->pDriver) )
continue;
// if this net is driven by an interver
// set the complemented attribute of the CO
assert( Ntl_ObjFaninNum(pNetCo->pDriver) == 1 );
pNetCo->fCompl = (int)(pNetCo->pDriver->pSop[0] == '0');
// remove the driver
Vec_PtrWriteEntry( pRoot->vObjs, pNetCo->pDriver->Id, NULL );
// remove the net
pNetFanin = Ntl_ObjFanin0(pNetCo->pDriver);
Ntl_ModelDeleteNet( pRoot, pNetFanin );
// make the CO net point to the new driver
assert( Ntl_ObjIsNode(pNetFanin->pDriver) );
pNetCo->pDriver = NULL;
pNetFanin->pDriver->pFanio[pNetFanin->pDriver->nFanins] = NULL;
Ntl_ModelSetNetDriver( pNetFanin->pDriver, pNetCo );
Counter++;
}
Vec_PtrFree( vCoNets );
pRoot->nObjs[NTL_OBJ_LUT1] -= Counter;
return Counter;
}
/**Function*************************************************************
Synopsis [Connects COs to the internal nodes other than inv/bufs.]
Description [Should be called immediately after reading from file.]
SideEffects [This procedure does not work because the internal net
(pNetFanin) may have other drivers.]
SeeAlso []
***********************************************************************/
int Ntl_ManReconnectCoDriverOne( Ntl_Net_t * pNetCo )
{
Ntl_Net_t * pNetFanin;
// skip the case when the net is not driven by a node
if ( !Ntl_ObjIsNode(pNetCo->pDriver) )
return 0;
// skip the case when the node is not an inv/buf
if ( Ntl_ObjFaninNum(pNetCo->pDriver) != 1 )
return 0;
// skip the case when the second-generation driver is not a node
pNetFanin = Ntl_ObjFanin0(pNetCo->pDriver);
if ( !Ntl_ObjIsNode(pNetFanin->pDriver) )
return 0;
// set the complemented attribute of the net
pNetCo->fCompl = (int)(pNetCo->pDriver->pSop[0] == '0');
// drive the CO net with the second-generation driver
pNetCo->pDriver = NULL;
pNetFanin->pDriver->pFanio[pNetFanin->pDriver->nFanins] = NULL;
if ( !Ntl_ModelSetNetDriver( pNetFanin->pDriver, pNetCo ) )
printf( "Ntl_ManReconnectCoDriverOne(): Cannot connect the net.\n" );
return 1;
}
/**Function*************************************************************
Synopsis [Connects COs to the internal nodes other than inv/bufs.]
Description [Should be called immediately after reading from file.]
SideEffects []
SeeAlso []
***********************************************************************/
int Ntl_ManReconnectCoDrivers( Ntl_Man_t * p )
{
Ntl_Net_t * pNetCo;
Ntl_Obj_t * pObj;
Ntl_Mod_t * pRoot;
int i, k, Counter;
Counter = 0;
pRoot = Ntl_ManRootModel( p );
Ntl_ModelForEachPo( pRoot, pObj, i )
Counter += Ntl_ManReconnectCoDriverOne( Ntl_ObjFanin0(pObj) );
Ntl_ModelForEachLatch( pRoot, pObj, i )
Counter += Ntl_ManReconnectCoDriverOne( Ntl_ObjFanin0(pObj) );
Ntl_ModelForEachBox( pRoot, pObj, i )
Ntl_ObjForEachFanin( pObj, pNetCo, k )
Counter += Ntl_ManReconnectCoDriverOne( pNetCo );
return Counter;
}
/**Function*************************************************************
Synopsis [Derives the array of CI names.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Ptr_t * Ntl_ManCollectCiNames( Ntl_Man_t * p )
{
Vec_Ptr_t * vNames;
Ntl_Net_t * pNet;
int i;
vNames = Vec_PtrAlloc( 1000 );
Ntl_ManForEachCiNet( p, pNet, i )
Vec_PtrPush( vNames, pNet->pName );
return vNames;
}
/**Function*************************************************************
Synopsis [Derives the array of CI names.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Ptr_t * Ntl_ManCollectCoNames( Ntl_Man_t * p )
{
Vec_Ptr_t * vNames;
Ntl_Net_t * pNet;
int i;
vNames = Vec_PtrAlloc( 1000 );
Ntl_ManForEachCoNet( p, pNet, i )
Vec_PtrPush( vNames, pNet->pName );
return vNames;
}
/**Function*************************************************************
Synopsis [Marks the CI/CO nets.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Ntl_ManMarkCiCoNets( Ntl_Man_t * p )
{
Ntl_Net_t * pNet;
int i;
Ntl_ManForEachCiNet( p, pNet, i )
pNet->fMark = 1;
Ntl_ManForEachCoNet( p, pNet, i )
pNet->fMark = 1;
}
/**Function*************************************************************
Synopsis [Unmarks the CI/CO nets.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Ntl_ManUnmarkCiCoNets( Ntl_Man_t * p )
{
Ntl_Net_t * pNet;
int i;
Ntl_ManForEachCiNet( p, pNet, i )
pNet->fMark = 0;
Ntl_ManForEachCoNet( p, pNet, i )
pNet->fMark = 0;
}
/**Function*************************************************************
Synopsis [Unmarks the CI/CO nets.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Ntl_ManCheckNetsAreNotMarked( Ntl_Mod_t * pModel )
{
Ntl_Net_t * pNet;
int i;
Ntl_ModelForEachNet( pModel, pNet, i )
assert( pNet->fMark == 0 );
return 1;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
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