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/**CFile****************************************************************
FileName [cnfUtil.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [AIG-to-CNF conversion.]
Synopsis []
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - April 28, 2007.]
Revision [$Id: cnfUtil.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
***********************************************************************/
#include "cnf.h"
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Computes area, references, and nodes used in the mapping.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Aig_ManScanMapping_rec( Cnf_Man_t * p, Aig_Obj_t * pObj, Vec_Ptr_t * vMapped )
{
Aig_Obj_t * pLeaf;
Dar_Cut_t * pCutBest;
int aArea, i;
if ( pObj->nRefs++ || Aig_ObjIsPi(pObj) || Aig_ObjIsConst1(pObj) )
return 0;
assert( Aig_ObjIsAnd(pObj) );
// collect the node first to derive pre-order
if ( vMapped )
Vec_PtrPush( vMapped, pObj );
// visit the transitive fanin of the selected cut
if ( pObj->fMarkB )
{
Vec_Ptr_t * vSuper = Vec_PtrAlloc( 100 );
Aig_ObjCollectSuper( pObj, vSuper );
aArea = Vec_PtrSize(vSuper) + 1;
Vec_PtrForEachEntry( vSuper, pLeaf, i )
aArea += Aig_ManScanMapping_rec( p, Aig_Regular(pLeaf), vMapped );
Vec_PtrFree( vSuper );
////////////////////////////
pObj->fMarkB = 1;
}
else
{
pCutBest = Dar_ObjBestCut( pObj );
aArea = Cnf_CutSopCost( p, pCutBest );
Dar_CutForEachLeaf( p->pManAig, pCutBest, pLeaf, i )
aArea += Aig_ManScanMapping_rec( p, pLeaf, vMapped );
}
return aArea;
}
/**Function*************************************************************
Synopsis [Computes area, references, and nodes used in the mapping.]
Description [Collects the nodes in reverse topological order.]
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Ptr_t * Aig_ManScanMapping( Cnf_Man_t * p, int fCollect )
{
Vec_Ptr_t * vMapped = NULL;
Aig_Obj_t * pObj;
int i;
// clean all references
Aig_ManForEachObj( p->pManAig, pObj, i )
pObj->nRefs = 0;
// allocate the array
if ( fCollect )
vMapped = Vec_PtrAlloc( 1000 );
// collect nodes reachable from POs in the DFS order through the best cuts
p->aArea = 0;
Aig_ManForEachPo( p->pManAig, pObj, i )
p->aArea += Aig_ManScanMapping_rec( p, Aig_ObjFanin0(pObj), vMapped );
// printf( "Variables = %6d. Clauses = %8d.\n", vMapped? Vec_PtrSize(vMapped) + Aig_ManPiNum(p->pManAig) + 1 : 0, p->aArea + 2 );
return vMapped;
}
/**Function*************************************************************
Synopsis [Computes area, references, and nodes used in the mapping.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Cnf_ManScanMapping_rec( Cnf_Man_t * p, Aig_Obj_t * pObj, Vec_Ptr_t * vMapped, int fPreorder )
{
Aig_Obj_t * pLeaf;
Cnf_Cut_t * pCutBest;
int aArea, i;
if ( pObj->nRefs++ || Aig_ObjIsPi(pObj) || Aig_ObjIsConst1(pObj) )
return 0;
assert( Aig_ObjIsAnd(pObj) );
assert( pObj->pData != NULL );
// add the node to the mapping
if ( vMapped && fPreorder )
Vec_PtrPush( vMapped, pObj );
// visit the transitive fanin of the selected cut
if ( pObj->fMarkB )
{
Vec_Ptr_t * vSuper = Vec_PtrAlloc( 100 );
Aig_ObjCollectSuper( pObj, vSuper );
aArea = Vec_PtrSize(vSuper) + 1;
Vec_PtrForEachEntry( vSuper, pLeaf, i )
aArea += Cnf_ManScanMapping_rec( p, Aig_Regular(pLeaf), vMapped, fPreorder );
Vec_PtrFree( vSuper );
////////////////////////////
pObj->fMarkB = 1;
}
else
{
pCutBest = pObj->pData;
// assert( pCutBest->nFanins > 0 );
assert( pCutBest->Cost < 127 );
aArea = pCutBest->Cost;
Cnf_CutForEachLeaf( p->pManAig, pCutBest, pLeaf, i )
aArea += Cnf_ManScanMapping_rec( p, pLeaf, vMapped, fPreorder );
}
// add the node to the mapping
if ( vMapped && !fPreorder )
Vec_PtrPush( vMapped, pObj );
return aArea;
}
/**Function*************************************************************
Synopsis [Computes area, references, and nodes used in the mapping.]
Description [Collects the nodes in reverse topological order.]
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Ptr_t * Cnf_ManScanMapping( Cnf_Man_t * p, int fCollect, int fPreorder )
{
Vec_Ptr_t * vMapped = NULL;
Aig_Obj_t * pObj;
int i;
// clean all references
Aig_ManForEachObj( p->pManAig, pObj, i )
pObj->nRefs = 0;
// allocate the array
if ( fCollect )
vMapped = Vec_PtrAlloc( 1000 );
// collect nodes reachable from POs in the DFS order through the best cuts
p->aArea = 0;
Aig_ManForEachPo( p->pManAig, pObj, i )
p->aArea += Cnf_ManScanMapping_rec( p, Aig_ObjFanin0(pObj), vMapped, fPreorder );
// printf( "Variables = %6d. Clauses = %8d.\n", vMapped? Vec_PtrSize(vMapped) + Aig_ManPiNum(p->pManAig) + 1 : 0, p->aArea + 2 );
return vMapped;
}
/**Function*************************************************************
Synopsis [Returns the array of CI IDs.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Int_t * Cnf_DataCollectCiSatNums( Cnf_Dat_t * pCnf, Aig_Man_t * p )
{
Vec_Int_t * vCiIds;
Aig_Obj_t * pObj;
int i;
vCiIds = Vec_IntAlloc( Aig_ManPiNum(p) );
Aig_ManForEachPi( p, pObj, i )
Vec_IntPush( vCiIds, pCnf->pVarNums[pObj->Id] );
return vCiIds;
}
/**Function*************************************************************
Synopsis [Returns the array of CI IDs.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Int_t * Cnf_DataCollectCoSatNums( Cnf_Dat_t * pCnf, Aig_Man_t * p )
{
Vec_Int_t * vCoIds;
Aig_Obj_t * pObj;
int i;
vCoIds = Vec_IntAlloc( Aig_ManPoNum(p) );
Aig_ManForEachPo( p, pObj, i )
Vec_IntPush( vCoIds, pCnf->pVarNums[pObj->Id] );
return vCoIds;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
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