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Diffstat (limited to 'src/aig/cnf/cnfUtil.c')
| -rw-r--r-- | src/aig/cnf/cnfUtil.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/src/aig/cnf/cnfUtil.c b/src/aig/cnf/cnfUtil.c new file mode 100644 index 00000000..cd47cb58 --- /dev/null +++ b/src/aig/cnf/cnfUtil.c @@ -0,0 +1,188 @@ +/**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->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; +} + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + |