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/**CFile****************************************************************
FileName [abcCollapse.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [Network and node package.]
Synopsis [Collapsing the network into two-levels.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: abcCollapse.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "abc.h"
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
static Abc_Ntk_t * Abc_NtkFromGlobalBdds( Abc_Ntk_t * pNtk );
static Abc_Obj_t * Abc_NodeFromGlobalBdds( Abc_Ntk_t * pNtkNew, DdManager * dd, DdNode * bFunc );
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Collapses the network.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Abc_Ntk_t * Abc_NtkCollapse( Abc_Ntk_t * pNtk, int fVerbose )
{
int fCheck = 1;
Abc_Ntk_t * pNtkNew;
assert( Abc_NtkIsStrash(pNtk) );
// compute the global BDDs
if ( Abc_NtkGlobalBdds(pNtk, 0) == NULL )
return NULL;
if ( fVerbose )
printf( "The shared BDD size is %d nodes.\n", Cudd_ReadKeys(pNtk->pManGlob) - Cudd_ReadDead(pNtk->pManGlob) );
// create the new network
pNtkNew = Abc_NtkFromGlobalBdds( pNtk );
Abc_NtkFreeGlobalBdds( pNtk );
if ( pNtkNew == NULL )
{
Cudd_Quit( pNtk->pManGlob );
pNtk->pManGlob = NULL;
return NULL;
}
Extra_StopManager( pNtk->pManGlob );
pNtk->pManGlob = NULL;
// make the network minimum base
Abc_NtkMinimumBase( pNtkNew );
// make sure that everything is okay
if ( fCheck && !Abc_NtkCheck( pNtkNew ) )
{
printf( "Abc_NtkCollapse: The network check has failed.\n" );
Abc_NtkDelete( pNtkNew );
return NULL;
}
return pNtkNew;
}
/**Function*************************************************************
Synopsis [Derives the network with the given global BDD.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Abc_Ntk_t * Abc_NtkFromGlobalBdds( Abc_Ntk_t * pNtk )
{
ProgressBar * pProgress;
Abc_Ntk_t * pNtkNew;
Abc_Obj_t * pNode, * pNodeNew;
DdManager * dd = pNtk->pManGlob;
int i;
// start the new network
pNtkNew = Abc_NtkStartFrom( pNtk, ABC_TYPE_LOGIC, ABC_FUNC_BDD );
// make sure the new manager has the same number of inputs
Cudd_bddIthVar( pNtkNew->pManFunc, dd->size-1 );
// process the POs
pProgress = Extra_ProgressBarStart( stdout, Abc_NtkCoNum(pNtk) );
Abc_NtkForEachCo( pNtk, pNode, i )
{
Extra_ProgressBarUpdate( pProgress, i, NULL );
pNodeNew = Abc_NodeFromGlobalBdds( pNtkNew, dd, Vec_PtrEntry(pNtk->vFuncsGlob, i) );
Abc_ObjAddFanin( pNode->pCopy, pNodeNew );
}
Extra_ProgressBarStop( pProgress );
return pNtkNew;
}
/**Function*************************************************************
Synopsis [Derives the network with the given global BDD.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Abc_Obj_t * Abc_NodeFromGlobalBdds( Abc_Ntk_t * pNtkNew, DdManager * dd, DdNode * bFunc )
{
Abc_Obj_t * pNodeNew, * pTemp;
int i;
// create a new node
pNodeNew = Abc_NtkCreateNode( pNtkNew );
// add the fanins in the order, in which they appear in the reordered manager
Abc_NtkForEachCi( pNtkNew, pTemp, i )
Abc_ObjAddFanin( pNodeNew, Abc_NtkCi(pNtkNew, dd->invperm[i]) );
// transfer the function
pNodeNew->pData = Extra_TransferLevelByLevel( dd, pNtkNew->pManFunc, bFunc ); Cudd_Ref( pNodeNew->pData );
return pNodeNew;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
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