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/**CFile****************************************************************
FileName [ntlSweep.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [Netlist representation.]
Synopsis [Performs structural sweep of the netlist.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: ntlSweep.c,v 1.1 2008/10/10 14:09:30 mjarvin Exp $]
***********************************************************************/
#include "ntl.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Detects logic that does not fanout into POs.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Ntl_ManSweepMark_rec( Ntl_Man_t * p, Ntl_Obj_t * pObj )
{
Ntl_Net_t * pNet;
int i;
if ( pObj->fMark )
return;
pObj->fMark = 1;
Ntl_ObjForEachFanin( pObj, pNet, i )
Ntl_ManSweepMark_rec( p, pNet->pDriver );
}
/**Function*************************************************************
Synopsis [Detects logic that does not fanout into POs.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Ntl_ManSweepMark( Ntl_Man_t * p )
{
Ntl_Mod_t * pRoot;
Ntl_Obj_t * pObj;
int i;
// get the root model
pRoot = Ntl_ManRootModel( p );
// clear net visited flags
Ntl_ModelForEachObj( pRoot, pObj, i )
assert( pObj->fMark == 0 );
// label the primary inputs
Ntl_ModelForEachPi( pRoot, pObj, i )
pObj->fMark = 1;
// start from the primary outputs
Ntl_ModelForEachPo( pRoot, pObj, i )
Ntl_ManSweepMark_rec( p, pObj );
// start from the persistant boxes
Ntl_ModelForEachBox( pRoot, pObj, i )
if ( pObj->pImplem->attrKeep )
Ntl_ManSweepMark_rec( p, pObj );
}
/**Function*************************************************************
Synopsis [Removes logic that does not fanout into POs.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Ntl_ManSweep( Ntl_Man_t * p, int fVerbose )
{
int nObjsOld[NTL_OBJ_VOID];
Ntl_Mod_t * pRoot, * pMod;
Ntl_Net_t * pNet;
Ntl_Obj_t * pObj;
int i, k, nNetsOld;
int ModelCounter = 0, Counter = 0;
// remember the number of objects
pRoot = Ntl_ManRootModel( p );
for ( i = 0; i < NTL_OBJ_VOID; i++ )
nObjsOld[i] = pRoot->nObjs[i];
nNetsOld = Ntl_ModelCountNets(pRoot);
// mark the nets that do not fanout into POs
Ntl_ManSweepMark( p );
// count how many boxes of each type are swept away
if ( fVerbose )
{
Ntl_ManForEachModel( p, pMod, i )
pMod->nUsed = pMod->nRems = 0;
Ntl_ModelForEachObj( pRoot, pObj, i )
if ( Ntl_ObjIsBox(pObj) && pObj->pImplem )
{
pObj->pImplem->nUsed++;
if ( !pObj->fMark )
{
if ( pObj->pImplem->nRems++ == 0 )
ModelCounter++;
}
}
}
// remove the useless objects and their nets
Ntl_ModelForEachObj( pRoot, pObj, i )
{
if ( pObj->fMark )
{
pObj->fMark = 0;
continue;
}
// remove the fanout nets
Ntl_ObjForEachFanout( pObj, pNet, k )
if ( pNet != NULL && pNet->pName[0] != 0 )
{
Ntl_ModelDeleteNet( pRoot, pNet );
Vec_PtrWriteEntry( pRoot->vNets, pNet->NetId, NULL );
}
// remove the object
if ( Ntl_ObjIsNode(pObj) && Ntl_ObjFaninNum(pObj) == 1 )
pRoot->nObjs[NTL_OBJ_LUT1]--;
else
pRoot->nObjs[pObj->Type]--;
Vec_PtrWriteEntry( pRoot->vObjs, pObj->Id, NULL );
pObj->Type = NTL_OBJ_NONE;
Counter++;
}
// print detailed statistics of sweeping
if ( fVerbose && Counter > 0)
{
int numLutBox = 0;
printf( "Swept away:" );
printf( " Node = %d (%4.1f %%)",
nObjsOld[NTL_OBJ_NODE] - pRoot->nObjs[NTL_OBJ_NODE],
!nObjsOld[NTL_OBJ_NODE]? 0.0: 100.0 * (nObjsOld[NTL_OBJ_NODE] - pRoot->nObjs[NTL_OBJ_NODE]) / nObjsOld[NTL_OBJ_NODE] );
printf( " Buf/Inv = %d (%4.1f %%)",
nObjsOld[NTL_OBJ_LUT1] - pRoot->nObjs[NTL_OBJ_LUT1],
!nObjsOld[NTL_OBJ_LUT1]? 0.0: 100.0 * (nObjsOld[NTL_OBJ_LUT1] - pRoot->nObjs[NTL_OBJ_LUT1]) / nObjsOld[NTL_OBJ_LUT1] );
printf( " Lat = %d (%4.1f %%)",
nObjsOld[NTL_OBJ_LATCH] - pRoot->nObjs[NTL_OBJ_LATCH],
!nObjsOld[NTL_OBJ_LATCH]? 0.0: 100.0 * (nObjsOld[NTL_OBJ_LATCH] - pRoot->nObjs[NTL_OBJ_LATCH]) / nObjsOld[NTL_OBJ_LATCH] );
printf( " Box = %d (%4.1f %%)",
nObjsOld[NTL_OBJ_BOX] - pRoot->nObjs[NTL_OBJ_BOX],
!nObjsOld[NTL_OBJ_BOX]? 0.0: 100.0 * (nObjsOld[NTL_OBJ_BOX] - pRoot->nObjs[NTL_OBJ_BOX]) / nObjsOld[NTL_OBJ_BOX] );
printf( "\n" );
if ( ModelCounter )
{
printf( "Sweep removed %d boxed of %d types (out of %d types):\n",
nObjsOld[NTL_OBJ_BOX] - pRoot->nObjs[NTL_OBJ_BOX], ModelCounter, Vec_PtrSize(p->vModels)-1 );
Ntl_ManForEachModel( p, pMod, i )
{
if ( i && (pMod->nRems + pMod->nUsed-pMod->nRems) > 0)
{
if (strncmp(pMod->pName, "LUT", 3) != 0)
{
//printf( "( M%d: %s, S=%d, L=%d ) ", i, pMod->pName, pMod->nRems, pMod->nUsed-pMod->nRems );
//printf( "Model %3d : %-40s Swept = %5d. Left = %5d.\n", i, pMod->pName, pMod->nRems, pMod->nUsed-pMod->nRems );
} else
{
numLutBox++;
}
}
}
// printf("\nLUTboxType =%d\n", numLutBox);
}
}
if ( !Ntl_ManCheck( p ) )
printf( "Ntl_ManSweep: The check has failed for design %s.\n", p->pName );
return Counter;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
|
