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/**CFile****************************************************************
FileName [abcStrash.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [Network and node package.]
Synopsis [Strashing of the current network.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: abcStrash.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "abc.h"
#include "extra.h"
#include "dec.h"
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
static void Abc_NtkStrashPerform( Abc_Ntk_t * pNtk, Abc_Ntk_t * pNtkNew, bool fAllNodes );
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Reapplies structural hashing to the AIG.]
Description [Because of the structural hashing, this procedure should not
change the number of nodes. It is useful to detect the bugs in the original AIG.]
SideEffects []
SeeAlso []
***********************************************************************/
Abc_Ntk_t * Abc_NtkRestrash( Abc_Ntk_t * pNtk, bool fCleanup )
{
extern int timeRetime;
Abc_Ntk_t * pNtkAig;
Abc_Obj_t * pObj;
int i, nNodes, RetValue;
assert( Abc_NtkIsStrash(pNtk) );
//timeRetime = clock();
// print warning about choice nodes
if ( Abc_NtkGetChoiceNum( pNtk ) )
printf( "Warning: The choice nodes in the original AIG are removed by strashing.\n" );
// start the new network (constants and CIs are already mappined after this step
pNtkAig = Abc_NtkStartFrom( pNtk, ABC_NTK_STRASH, ABC_FUNC_AIG );
// restrash the nodes (assuming a topological order of the old network)
Abc_NtkForEachNode( pNtk, pObj, i )
pObj->pCopy = Abc_AigAnd( pNtkAig->pManFunc, Abc_ObjChild0Copy(pObj), Abc_ObjChild1Copy(pObj) );
//l finalize the network
Abc_NtkFinalize( pNtk, pNtkAig );
// print warning about self-feed latches
// if ( Abc_NtkCountSelfFeedLatches(pNtkAig) )
// printf( "Warning: The network has %d self-feeding latches.\n", Abc_NtkCountSelfFeedLatches(pNtkAig) );
// perform cleanup if requested
if ( fCleanup && (nNodes = Abc_AigCleanup(pNtkAig->pManFunc)) )
printf( "Abc_NtkRestrash(): AIG cleanup removed %d nodes (this is a bug).\n", nNodes );
// duplicate EXDC
if ( pNtk->pExdc )
pNtkAig->pExdc = Abc_NtkDup( pNtk->pExdc );
// make sure everything is okay
if ( !Abc_NtkCheck( pNtkAig ) )
{
printf( "Abc_NtkStrash: The network check has failed.\n" );
Abc_NtkDelete( pNtkAig );
return NULL;
}
//timeRetime = clock() - timeRetime;
if ( RetValue = Abc_NtkRemoveSelfFeedLatches(pNtkAig) )
printf( "Modified %d self-feeding latches. The result will not verify.\n", RetValue );
return pNtkAig;
}
/**Function*************************************************************
Synopsis [Transforms logic network into structurally hashed AIG.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Abc_Ntk_t * Abc_NtkStrash( Abc_Ntk_t * pNtk, bool fAllNodes, bool fCleanup )
{
Abc_Ntk_t * pNtkAig;
int nNodes;
assert( Abc_NtkIsLogic(pNtk) || Abc_NtkIsStrash(pNtk) );
// consider the special case when the network is already structurally hashed
if ( Abc_NtkIsStrash(pNtk) )
return Abc_NtkRestrash( pNtk, fCleanup );
// convert the node representation in the logic network to the AIG form
if ( !Abc_NtkLogicToAig(pNtk) )
{
printf( "Converting to AIGs has failed.\n" );
return NULL;
}
// perform strashing
// Abc_NtkCleanCopy( pNtk );
pNtkAig = Abc_NtkStartFrom( pNtk, ABC_NTK_STRASH, ABC_FUNC_AIG );
Abc_NtkStrashPerform( pNtk, pNtkAig, fAllNodes );
Abc_NtkFinalize( pNtk, pNtkAig );
// print warning about self-feed latches
// if ( Abc_NtkCountSelfFeedLatches(pNtkAig) )
// printf( "Warning: The network has %d self-feeding latches.\n", Abc_NtkCountSelfFeedLatches(pNtkAig) );
// perform cleanup if requested
nNodes = fCleanup? Abc_AigCleanup(pNtkAig->pManFunc) : 0;
// if ( nNodes )
// printf( "Warning: AIG cleanup removed %d nodes (this is not a bug).\n", nNodes );
// duplicate EXDC
if ( pNtk->pExdc )
pNtkAig->pExdc = Abc_NtkDup( pNtk->pExdc );
// make sure everything is okay
if ( !Abc_NtkCheck( pNtkAig ) )
{
printf( "Abc_NtkStrash: The network check has failed.\n" );
Abc_NtkDelete( pNtkAig );
return NULL;
}
return pNtkAig;
}
/**Function*************************************************************
Synopsis [Appends the second network to the first.]
Description [Modifies the first network by adding the logic of the second.
Performs structural hashing while appending the networks. Does not change
the second network. Returns 0 if the appending failed, 1 otherise.]
SideEffects []
SeeAlso []
***********************************************************************/
int Abc_NtkAppend( Abc_Ntk_t * pNtk1, Abc_Ntk_t * pNtk2, int fAddPos )
{
Abc_Obj_t * pObj;
char * pName;
int i, nNewCis;
// the first network should be an AIG
assert( Abc_NtkIsStrash(pNtk1) );
assert( Abc_NtkIsLogic(pNtk2) || Abc_NtkIsStrash(pNtk2) );
if ( Abc_NtkIsLogic(pNtk2) && !Abc_NtkLogicToAig(pNtk2) )
{
printf( "Converting to AIGs has failed.\n" );
return 0;
}
// check that the networks have the same PIs
// reorder PIs of pNtk2 according to pNtk1
if ( !Abc_NtkCompareSignals( pNtk1, pNtk2, 1, 1 ) )
printf( "Abc_NtkAppend(): The union of the network PIs is computed (warning).\n" );
// perform strashing
nNewCis = 0;
Abc_NtkCleanCopy( pNtk2 );
Abc_NtkForEachCi( pNtk2, pObj, i )
{
pName = Abc_ObjName(pObj);
pObj->pCopy = Abc_NtkFindCi(pNtk1, Abc_ObjName(pObj));
if ( pObj->pCopy == NULL )
{
pObj->pCopy = Abc_NtkDupObj(pNtk1, pObj, 1);
nNewCis++;
}
}
if ( nNewCis )
printf( "Warning: Procedure Abc_NtkAppend() added %d new CIs.\n", nNewCis );
// add pNtk2 to pNtk1 while strashing
if ( Abc_NtkIsLogic(pNtk2) )
Abc_NtkStrashPerform( pNtk2, pNtk1, 1 );
else
Abc_NtkForEachNode( pNtk2, pObj, i )
pObj->pCopy = Abc_AigAnd( pNtk1->pManFunc, Abc_ObjChild0Copy(pObj), Abc_ObjChild1Copy(pObj) );
// add the COs of the second network
if ( fAddPos )
{
Abc_NtkForEachPo( pNtk2, pObj, i )
{
Abc_NtkDupObj( pNtk1, pObj, 0 );
Abc_ObjAddFanin( pObj->pCopy, Abc_ObjChild0Copy(pObj) );
Abc_ObjAssignName( pObj->pCopy, Abc_ObjName(pObj->pCopy), NULL );
}
}
// make sure that everything is okay
if ( !Abc_NtkCheck( pNtk1 ) )
{
printf( "Abc_NtkAppend: The network check has failed.\n" );
return 0;
}
return 1;
}
/**Function*************************************************************
Synopsis [Prepares the network for strashing.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Abc_NtkStrashPerform( Abc_Ntk_t * pNtkOld, Abc_Ntk_t * pNtkNew, bool fAllNodes )
{
extern Vec_Ptr_t * Abc_NtkDfsIter( Abc_Ntk_t * pNtk, int fCollectAll );
ProgressBar * pProgress;
Vec_Ptr_t * vNodes;
Abc_Obj_t * pNodeOld;
int i, clk = clock();
assert( Abc_NtkIsLogic(pNtkOld) );
assert( Abc_NtkIsStrash(pNtkNew) );
// vNodes = Abc_NtkDfs( pNtkOld, fAllNodes );
vNodes = Abc_NtkDfsIter( pNtkOld, fAllNodes );
//printf( "Nodes = %d. ", Vec_PtrSize(vNodes) );
//PRT( "Time", clock() - clk );
pProgress = Extra_ProgressBarStart( stdout, vNodes->nSize );
Vec_PtrForEachEntry( vNodes, pNodeOld, i )
{
Extra_ProgressBarUpdate( pProgress, i, NULL );
pNodeOld->pCopy = Abc_NodeStrash( pNtkNew, pNodeOld );
}
Extra_ProgressBarStop( pProgress );
Vec_PtrFree( vNodes );
}
/**Function*************************************************************
Synopsis [Transfers the AIG from one manager into another.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Abc_NodeStrash_rec( Abc_Aig_t * pMan, Hop_Obj_t * pObj )
{
assert( !Hop_IsComplement(pObj) );
if ( !Hop_ObjIsNode(pObj) || Hop_ObjIsMarkA(pObj) )
return;
Abc_NodeStrash_rec( pMan, Hop_ObjFanin0(pObj) );
Abc_NodeStrash_rec( pMan, Hop_ObjFanin1(pObj) );
pObj->pData = Abc_AigAnd( pMan, (Abc_Obj_t *)Hop_ObjChild0Copy(pObj), (Abc_Obj_t *)Hop_ObjChild1Copy(pObj) );
assert( !Hop_ObjIsMarkA(pObj) ); // loop detection
Hop_ObjSetMarkA( pObj );
}
/**Function*************************************************************
Synopsis [Strashes one logic node.]
Description [Assume the network is in the AIG form]
SideEffects []
SeeAlso []
***********************************************************************/
Abc_Obj_t * Abc_NodeStrash( Abc_Ntk_t * pNtkNew, Abc_Obj_t * pNodeOld )
{
Hop_Man_t * pMan;
Hop_Obj_t * pRoot;
Abc_Obj_t * pFanin;
int i;
assert( Abc_ObjIsNode(pNodeOld) );
assert( Abc_NtkHasAig(pNodeOld->pNtk) && !Abc_NtkIsStrash(pNodeOld->pNtk) );
// get the local AIG manager and the local root node
pMan = pNodeOld->pNtk->pManFunc;
pRoot = pNodeOld->pData;
// check the constant case
if ( Abc_NodeIsConst(pNodeOld) || Hop_Regular(pRoot) == Hop_ManConst1(pMan) )
return Abc_ObjNotCond( Abc_AigConst1(pNtkNew), Hop_IsComplement(pRoot) );
// set elementary variables
Abc_ObjForEachFanin( pNodeOld, pFanin, i )
Hop_IthVar(pMan, i)->pData = pFanin->pCopy;
// strash the AIG of this node
Abc_NodeStrash_rec( pNtkNew->pManFunc, Hop_Regular(pRoot) );
Hop_ConeUnmark_rec( Hop_Regular(pRoot) );
// return the final node
return Abc_ObjNotCond( Hop_Regular(pRoot)->pData, Hop_IsComplement(pRoot) );
}
/**Function*************************************************************
Synopsis [Copies the topmost levels of the network.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Abc_Obj_t * Abc_NtkTopmost_rec( Abc_Ntk_t * pNtkNew, Abc_Obj_t * pNode, int LevelCut )
{
assert( Abc_ObjIsComplement(pNode) );
if ( pNode->pCopy )
return pNode->pCopy;
if ( pNode->Level <= (unsigned)LevelCut )
return pNode->pCopy = Abc_NtkCreatePi( pNtkNew );
Abc_NtkTopmost_rec( pNtkNew, Abc_ObjFanin0(pNode), LevelCut );
Abc_NtkTopmost_rec( pNtkNew, Abc_ObjFanin1(pNode), LevelCut );
return pNode->pCopy = Abc_AigAnd( pNtkNew->pManFunc, Abc_ObjChild0Copy(pNode), Abc_ObjChild1Copy(pNode) );
}
/**Function*************************************************************
Synopsis [Copies the topmost levels of the network.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Abc_Ntk_t * Abc_NtkTopmost( Abc_Ntk_t * pNtk, int nLevels )
{
Abc_Ntk_t * pNtkNew;
Abc_Obj_t * pObjNew, * pPoNew;
int LevelCut;
assert( Abc_NtkIsStrash(pNtk) );
assert( Abc_NtkCoNum(pNtk) == 1 );
// get the cutoff level
LevelCut = ABC_MAX( 0, Abc_AigLevel(pNtk) - nLevels );
// start the network
pNtkNew = Abc_NtkAlloc( ABC_NTK_STRASH, ABC_FUNC_AIG, 1 );
pNtkNew->pName = Extra_UtilStrsav(pNtk->pName);
Abc_AigConst1(pNtk)->pCopy = Abc_AigConst1(pNtkNew);
// create PIs below the cut and nodes above the cut
Abc_NtkCleanCopy( pNtk );
pObjNew = Abc_NtkTopmost_rec( pNtkNew, Abc_ObjFanin0(Abc_NtkPo(pNtk, 0)), LevelCut );
// add the PO node and name
pPoNew = Abc_NtkCreatePo(pNtkNew);
Abc_ObjAddFanin( pPoNew, pObjNew );
Abc_NtkAddDummyPiNames( pNtkNew );
Abc_ObjAssignName( pPoNew, Abc_ObjName(Abc_NtkPo(pNtk, 0)), NULL );
// make sure everything is okay
if ( !Abc_NtkCheck( pNtkNew ) )
{
printf( "Abc_NtkTopmost: The network check has failed.\n" );
Abc_NtkDelete( pNtkNew );
return NULL;
}
return pNtkNew;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
|
