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/**CFile****************************************************************
FileName [sbdPath.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [SAT-based optimization using internal don't-cares.]
Synopsis [Critical path.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: sbdPath.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "sbdInt.h"
#include "misc/tim/tim.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Sbc_ManAddInternalToPath_rec( Gia_Man_t * p, int iObj, Vec_Bit_t * vPath )
{
Gia_Obj_t * pObj;
int k, iFan, Value = 0;
if ( Gia_ObjIsTravIdCurrentId(p, iObj) )
return Vec_BitEntry(vPath, iObj);
Gia_ObjSetTravIdCurrentId(p, iObj);
pObj = Gia_ManObj( p, iObj );
if ( Gia_ObjIsCi(pObj) )
return Vec_BitEntry(vPath, iObj);
assert( Gia_ObjIsAnd(pObj) );
Gia_LutForEachFanin( p, iObj, iFan, k )
Value |= Sbc_ManAddInternalToPath_rec( p, iFan, vPath );
if ( Value )
Vec_BitWriteEntry( vPath, iObj, 1 );
return Value;
}
void Sbc_ManAddInternalToPath( Gia_Man_t * p, Vec_Bit_t * vPath )
{
int k, iFan, iObj;
Gia_ManForEachLut( p, iObj )
{
if ( !Vec_BitEntry(vPath, iObj) )
continue;
Gia_ManIncrementTravId( p );
Gia_LutForEachFanin( p, iObj, iFan, k )
Gia_ObjSetTravIdCurrentId(p, iFan);
Sbc_ManAddInternalToPath_rec( p, iObj, vPath );
}
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Sbc_ManCriticalPath_rec( Gia_Man_t * p, int * pLevels, int iObj, int LevelFan, Vec_Bit_t * vPath, int Slack )
{
Gia_Obj_t * pObj; int k, iFan;
if ( Gia_ObjIsTravIdCurrentId(p, iObj) )
return;
Gia_ObjSetTravIdCurrentId(p, iObj);
pObj = Gia_ManObj( p, iObj );
Vec_BitWriteEntry( vPath, iObj, 1 );
if ( Gia_ObjIsCi(pObj) )
{
Tim_Man_t * pManTime = (Tim_Man_t *)p->pManTime;
int iBox = pManTime ? Tim_ManBoxForCi( pManTime, Gia_ObjCioId(pObj) ) : -1;
if ( iBox >= 0 )
{
int curCo = Tim_ManBoxInputFirst( pManTime, iBox );
int nBoxInputs = Tim_ManBoxInputNum( pManTime, iBox );
for ( k = 0; k < nBoxInputs; k++ )
{
Gia_Obj_t * pCo = Gia_ManCo( p, curCo + k );
int iDriver = Gia_ObjFaninId0p( p, pCo );
if ( (pLevels[iDriver]+Slack >= LevelFan-1) && iDriver )
Sbc_ManCriticalPath_rec( p, pLevels, iDriver, pLevels[iDriver], vPath, Abc_MaxInt(0, pLevels[iDriver]+Slack-(LevelFan-1)) );
}
}
return;
}
assert( Gia_ObjIsAnd(pObj) );
Gia_LutForEachFanin( p, iObj, iFan, k )
if ( pLevels[iFan]+Slack >= LevelFan-1 )
Sbc_ManCriticalPath_rec( p, pLevels, iFan, pLevels[iFan], vPath, Abc_MaxInt(0, pLevels[iFan]+Slack-(LevelFan-1)) );
}
Vec_Bit_t * Sbc_ManCriticalPath( Gia_Man_t * p )
{
int * pLevels = NULL, k, iDriver, Slack = 1;
int nLevels = p->pManTime ? Gia_ManLutLevelWithBoxes(p) : Gia_ManLutLevel(p, &pLevels);
Vec_Bit_t * vPath = Vec_BitStart( Gia_ManObjNum(p) );
if ( p->pManTime )
pLevels = Vec_IntArray( p->vLevels );
Gia_ManIncrementTravId( p );
Gia_ManForEachCoDriverId( p, iDriver, k )
if ( (pLevels[iDriver] == nLevels) && iDriver )
Sbc_ManCriticalPath_rec( p, pLevels, iDriver, pLevels[iDriver], vPath, Slack );
if ( !p->pManTime )
ABC_FREE( pLevels );
Sbc_ManAddInternalToPath( p, vPath );
return vPath;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
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