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/**CFile****************************************************************
FileName [fpgaFanout.c]
PackageName [FRAIG: Functionally reduced AND-INV graphs.]
Synopsis [Procedures to manipulate fanouts of the FRAIG nodes.]
Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>]
Affiliation [UC Berkeley]
Date [Ver. 2.0. Started - August 18, 2004.]
Revision [$Id: fpgaFanout.c,v 1.1 2005/01/23 06:59:41 alanmi Exp $]
***********************************************************************/
#include "fpgaInt.h"
#ifdef MAP_ALLOCATE_FANOUT
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Add the fanout to the node.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Fpga_NodeAddFaninFanout( Fpga_Node_t * pFanin, Fpga_Node_t * pFanout )
{
Fpga_Node_t * pPivot;
// pFanins is a fanin of pFanout
assert( !Fpga_IsComplement(pFanin) );
assert( !Fpga_IsComplement(pFanout) );
assert( Fpga_Regular(pFanout->p1) == pFanin || Fpga_Regular(pFanout->p2) == pFanin );
pPivot = pFanin->pFanPivot;
if ( pPivot == NULL )
{
pFanin->pFanPivot = pFanout;
return;
}
if ( Fpga_Regular(pPivot->p1) == pFanin )
{
if ( Fpga_Regular(pFanout->p1) == pFanin )
{
pFanout->pFanFanin1 = pPivot->pFanFanin1;
pPivot->pFanFanin1 = pFanout;
}
else // if ( Fpga_Regular(pFanout->p2) == pFanin )
{
pFanout->pFanFanin2 = pPivot->pFanFanin1;
pPivot->pFanFanin1 = pFanout;
}
}
else // if ( Fpga_Regular(pPivot->p2) == pFanin )
{
assert( Fpga_Regular(pPivot->p2) == pFanin );
if ( Fpga_Regular(pFanout->p1) == pFanin )
{
pFanout->pFanFanin1 = pPivot->pFanFanin2;
pPivot->pFanFanin2 = pFanout;
}
else // if ( Fpga_Regular(pFanout->p2) == pFanin )
{
pFanout->pFanFanin2 = pPivot->pFanFanin2;
pPivot->pFanFanin2 = pFanout;
}
}
}
/**Function*************************************************************
Synopsis [Add the fanout to the node.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Fpga_NodeRemoveFaninFanout( Fpga_Node_t * pFanin, Fpga_Node_t * pFanoutToRemove )
{
Fpga_Node_t * pFanout, * pFanout2, ** ppFanList;
// start the linked list of fanouts
ppFanList = &pFanin->pFanPivot;
// go through the fanouts
Fpga_NodeForEachFanoutSafe( pFanin, pFanout, pFanout2 )
{
// skip the fanout-to-remove
if ( pFanout == pFanoutToRemove )
continue;
// add useful fanouts to the list
*ppFanList = pFanout;
ppFanList = Fpga_NodeReadNextFanoutPlace( pFanin, pFanout );
}
*ppFanList = NULL;
}
/**Function*************************************************************
Synopsis [Returns the number of fanouts of a node.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Fpga_NodeGetFanoutNum( Fpga_Node_t * pNode )
{
Fpga_Node_t * pFanout;
int Counter = 0;
Fpga_NodeForEachFanout( pNode, pFanout )
Counter++;
return Counter;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
#endif
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