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/**CFile****************************************************************
FileName [abcCas.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [Network and node package.]
Synopsis [Decomposition of shared BDDs into LUT cascade.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: abcCas.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "base/abc/abc.h"
#ifdef ABC_USE_CUDD
#include "bdd/extrab/extraBdd.h"
#endif
ABC_NAMESPACE_IMPL_START
/*
This LUT cascade synthesis algorithm is described in the paper:
A. Mishchenko and T. Sasao, "Encoding of Boolean functions and its
application to LUT cascade synthesis", Proc. IWLS '02, pp. 115-120.
http://www.eecs.berkeley.edu/~alanmi/publications/2002/iwls02_enc.pdf
*/
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
#ifdef ABC_USE_CUDD
extern int Abc_CascadeExperiment( char * pFileGeneric, DdManager * dd, DdNode ** pOutputs, int nInputs, int nOutputs, int nLutSize, int fCheck, int fVerbose );
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Abc_Ntk_t * Abc_NtkCascade( Abc_Ntk_t * pNtk, int nLutSize, int fCheck, int fVerbose )
{
DdManager * dd;
DdNode ** ppOutputs;
Abc_Ntk_t * pNtkNew;
Abc_Obj_t * pNode;
char * pFileGeneric;
int fBddSizeMax = 500000;
int i, fReorder = 1;
abctime clk = Abc_Clock();
assert( Abc_NtkIsStrash(pNtk) );
// compute the global BDDs
if ( Abc_NtkBuildGlobalBdds(pNtk, fBddSizeMax, 1, fReorder, fVerbose) == NULL )
return NULL;
if ( fVerbose )
{
DdManager * dd = (DdManager *)Abc_NtkGlobalBddMan( pNtk );
printf( "Shared BDD size = %6d nodes. ", Cudd_ReadKeys(dd) - Cudd_ReadDead(dd) );
ABC_PRT( "BDD construction time", Abc_Clock() - clk );
}
// collect global BDDs
dd = (DdManager *)Abc_NtkGlobalBddMan( pNtk );
ppOutputs = ABC_ALLOC( DdNode *, Abc_NtkCoNum(pNtk) );
Abc_NtkForEachCo( pNtk, pNode, i )
ppOutputs[i] = (DdNode *)Abc_ObjGlobalBdd(pNode);
// call the decomposition
pFileGeneric = Extra_FileNameGeneric( pNtk->pSpec );
if ( !Abc_CascadeExperiment( pFileGeneric, dd, ppOutputs, Abc_NtkCiNum(pNtk), Abc_NtkCoNum(pNtk), nLutSize, fCheck, fVerbose ) )
{
// the LUT size is too small
}
// for now, duplicate the network
pNtkNew = Abc_NtkDup( pNtk );
// cleanup
Abc_NtkFreeGlobalBdds( pNtk, 1 );
ABC_FREE( ppOutputs );
ABC_FREE( pFileGeneric );
// if ( pNtk->pExdc )
// pNtkNew->pExdc = Abc_NtkDup( pNtk->pExdc );
// make sure that everything is okay
if ( !Abc_NtkCheck( pNtkNew ) )
{
printf( "Abc_NtkCollapse: The network check has failed.\n" );
Abc_NtkDelete( pNtkNew );
return NULL;
}
return pNtkNew;
}
#else
Abc_Ntk_t * Abc_NtkCascade( Abc_Ntk_t * pNtk, int nLutSize, int fCheck, int fVerbose ) { return NULL; }
#endif
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
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