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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 [Reads the maximum number of fanins.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Ntl_ModelGetFaninMax( Ntl_Mod_t * pRoot )
{
Ntl_Obj_t * pNode;
int i, nFaninsMax = 0;
Ntl_ModelForEachNode( pRoot, pNode, i )
{
if ( nFaninsMax < Ntl_ObjFaninNum(pNode) )
nFaninsMax = Ntl_ObjFaninNum(pNode);
}
return nFaninsMax;
}
/**Function*************************************************************
Synopsis [If the net is driven by an inv/buf, returns its fanin.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Ntl_Net_t * Ntl_ModelFindSimpleNet( Ntl_Net_t * pNetCo )
{
// skip the case when the net is not driven by a node
if ( !Ntl_ObjIsNode(pNetCo->pDriver) )
return NULL;
// skip the case when the node is not an inv/buf
if ( Ntl_ObjFaninNum(pNetCo->pDriver) != 1 )
return NULL;
return Ntl_ObjFanin0(pNetCo->pDriver);
}
/**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 [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;
}
/**Function*************************************************************
Synopsis [Convert initial values of registers to be zero.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Ntl_ManSetZeroInitValues( Ntl_Man_t * p )
{
Ntl_Mod_t * pRoot;
Ntl_Obj_t * pObj;
int i;
pRoot = Ntl_ManRootModel(p);
Ntl_ModelForEachLatch( pRoot, pObj, i )
pObj->LatchId &= ~3;
}
/**Function*************************************************************
Synopsis [Transforms the netlist to have latches with const-0 init-values.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Ntl_ManAddInverters( Ntl_Obj_t * pObj )
{
char * pStore;
Ntl_Mod_t * pRoot = pObj->pModel;
Ntl_Man_t * pMan = pRoot->pMan;
Ntl_Net_t * pNetLo, * pNetLi, * pNetLoInv, * pNetLiInv;
Ntl_Obj_t * pNode;
int nLength, RetValue;
assert( (pObj->LatchId & 3) == 1 );
// get the nets
pNetLi = Ntl_ObjFanin0(pObj);
pNetLo = Ntl_ObjFanout0(pObj);
// get storage for net names
nLength = strlen(pNetLi->pName) + strlen(pNetLo->pName) + 10;
pStore = Aig_MmFlexEntryFetch( pMan->pMemSops, nLength );
// create input interter
pNode = Ntl_ModelCreateNode( pRoot, 1 );
pNode->pSop = Ntl_ManStoreSop( pMan->pMemSops, "0 1\n" );
Ntl_ObjSetFanin( pNode, pNetLi, 0 );
// create input net
strcpy( pStore, pNetLi->pName );
strcat( pStore, "_inv" );
if ( Ntl_ModelFindNet( pRoot, pStore ) )
{
printf( "Ntl_ManTransformInitValues(): Internal error! Cannot create net with LI-name + _inv\n" );
return;
}
pNetLiInv = Ntl_ModelFindOrCreateNet( pRoot, pStore );
RetValue = Ntl_ModelSetNetDriver( pNode, pNetLiInv );
assert( RetValue );
// connect latch to the input net
Ntl_ObjSetFanin( pObj, pNetLiInv, 0 );
// disconnect latch from the output net
RetValue = Ntl_ModelClearNetDriver( pObj, pNetLo );
assert( RetValue );
// create the output net
strcpy( pStore, pNetLo->pName );
strcat( pStore, "_inv" );
if ( Ntl_ModelFindNet( pRoot, pStore ) )
{
printf( "Ntl_ManTransformInitValues(): Internal error! Cannot create net with LO-name + _inv\n" );
return;
}
pNetLoInv = Ntl_ModelFindOrCreateNet( pRoot, pStore );
RetValue = Ntl_ModelSetNetDriver( pObj, pNetLoInv );
assert( RetValue );
// create output interter
pNode = Ntl_ModelCreateNode( pRoot, 1 );
pNode->pSop = Ntl_ManStoreSop( pMan->pMemSops, "0 1\n" );
Ntl_ObjSetFanin( pNode, pNetLoInv, 0 );
// redirect the old output net
RetValue = Ntl_ModelSetNetDriver( pNode, pNetLo );
assert( RetValue );
}
/**Function*************************************************************
Synopsis [Transforms the netlist to have latches with const-0 init-values.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Ntl_ManTransformInitValues( Ntl_Man_t * p )
{
Ntl_Mod_t * pRoot;
Ntl_Obj_t * pObj;
int i;
pRoot = Ntl_ManRootModel(p);
Ntl_ModelForEachLatch( pRoot, pObj, i )
{
if ( (pObj->LatchId & 3) == 1 )
Ntl_ManAddInverters( pObj );
pObj->LatchId &= ~3;
}
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
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