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Diffstat (limited to 'src/sat/cnf/cnfPost.c')
| -rw-r--r-- | src/sat/cnf/cnfPost.c | 238 |
1 files changed, 238 insertions, 0 deletions
diff --git a/src/sat/cnf/cnfPost.c b/src/sat/cnf/cnfPost.c new file mode 100644 index 00000000..f7491889 --- /dev/null +++ b/src/sat/cnf/cnfPost.c @@ -0,0 +1,238 @@ +/**CFile**************************************************************** + + FileName [cnfPost.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: cnfPost.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $] + +***********************************************************************/ + +#include "cnf.h" + +ABC_NAMESPACE_IMPL_START + + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Cnf_ManPostprocess_old( Cnf_Man_t * p ) +{ +// extern int Aig_ManLargeCutEval( Aig_Man_t * p, Aig_Obj_t * pRoot, Dar_Cut_t * pCutR, Dar_Cut_t * pCutL, int Leaf ); + int nNew, Gain, nGain = 0, nVars = 0; + + Aig_Obj_t * pObj, * pFan; + Dar_Cut_t * pCutBest, * pCut; + int i, k;//, a, b, Counter; + Aig_ManForEachObj( p->pManAig, pObj, i ) + { + if ( !Aig_ObjIsNode(pObj) ) + continue; + if ( pObj->nRefs == 0 ) + continue; +// pCutBest = Aig_ObjBestCut(pObj); + pCutBest = NULL; + + Dar_CutForEachLeaf( p->pManAig, pCutBest, pFan, k ) + { + if ( !Aig_ObjIsNode(pFan) ) + continue; + assert( pFan->nRefs != 0 ); + if ( pFan->nRefs != 1 ) + continue; +// pCut = Aig_ObjBestCut(pFan); + pCut = NULL; +/* + // find how many common variable they have + Counter = 0; + for ( a = 0; a < (int)pCut->nLeaves; a++ ) + { + for ( b = 0; b < (int)pCutBest->nLeaves; b++ ) + if ( pCut->pLeaves[a] == pCutBest->pLeaves[b] ) + break; + if ( b == (int)pCutBest->nLeaves ) + continue; + Counter++; + } + printf( "%d ", Counter ); +*/ + // find the new truth table after collapsing these two cuts + + +// nNew = Aig_ManLargeCutEval( p->pManAig, pObj, pCutBest, pCut, pFan->Id ); + nNew = 0; + + +// printf( "%d+%d=%d:%d(%d) ", pCutBest->Cost, pCut->Cost, +// pCutBest->Cost+pCut->Cost, nNew, pCutBest->Cost+pCut->Cost-nNew ); + + Gain = pCutBest->Value + pCut->Value - nNew; + if ( Gain > 0 ) + { + nGain += Gain; + nVars++; + } + } + } + printf( "Total gain = %d. Vars = %d.\n", nGain, nVars ); +} + +/**Function************************************************************* + + Synopsis [Transfers cuts of the mapped nodes into internal representation.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Cnf_ManTransferCuts( Cnf_Man_t * p ) +{ + Aig_Obj_t * pObj; + int i; + Aig_MmFlexRestart( p->pMemCuts ); + Aig_ManForEachObj( p->pManAig, pObj, i ) + { + if ( Aig_ObjIsNode(pObj) && pObj->nRefs > 0 ) + pObj->pData = Cnf_CutCreate( p, pObj ); + else + pObj->pData = NULL; + } +} + +/**Function************************************************************* + + Synopsis [Transfers cuts of the mapped nodes into internal representation.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Cnf_ManFreeCuts( Cnf_Man_t * p ) +{ + Aig_Obj_t * pObj; + int i; + Aig_ManForEachObj( p->pManAig, pObj, i ) + if ( pObj->pData ) + { + Cnf_CutFree( (Cnf_Cut_t *)pObj->pData ); + pObj->pData = NULL; + } +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Cnf_ManPostprocess( Cnf_Man_t * p ) +{ + Cnf_Cut_t * pCut, * pCutFan, * pCutRes; + Aig_Obj_t * pObj, * pFan; + int Order[16], Costs[16]; + int i, k, fChanges; + Aig_ManForEachNode( p->pManAig, pObj, i ) + { + if ( pObj->nRefs == 0 ) + continue; + pCut = Cnf_ObjBestCut(pObj); + + // sort fanins according to their size + Cnf_CutForEachLeaf( p->pManAig, pCut, pFan, k ) + { + Order[k] = k; + Costs[k] = Aig_ObjIsNode(pFan)? Cnf_ObjBestCut(pFan)->Cost : 0; + } + // sort the cuts by Weight + do { + int Temp; + fChanges = 0; + for ( k = 0; k < pCut->nFanins - 1; k++ ) + { + if ( Costs[Order[k]] <= Costs[Order[k+1]] ) + continue; + Temp = Order[k]; + Order[k] = Order[k+1]; + Order[k+1] = Temp; + fChanges = 1; + } + } while ( fChanges ); + + +// Cnf_CutForEachLeaf( p->pManAig, pCut, pFan, k ) + for ( k = 0; (k < (int)(pCut)->nFanins) && ((pFan) = Aig_ManObj(p->pManAig, (pCut)->pFanins[Order[k]])); k++ ) + { + if ( !Aig_ObjIsNode(pFan) ) + continue; + assert( pFan->nRefs != 0 ); + if ( pFan->nRefs != 1 ) + continue; + pCutFan = Cnf_ObjBestCut(pFan); + // try composing these two cuts +// Cnf_CutPrint( pCut ); + pCutRes = Cnf_CutCompose( p, pCut, pCutFan, pFan->Id ); +// Cnf_CutPrint( pCut ); +// printf( "\n" ); + // check if the cost if reduced + if ( pCutRes == NULL || pCutRes->Cost == 127 || pCutRes->Cost > pCut->Cost + pCutFan->Cost ) + { + if ( pCutRes ) + Cnf_CutFree( pCutRes ); + continue; + } + // update the cut + Cnf_ObjSetBestCut( pObj, pCutRes ); + Cnf_ObjSetBestCut( pFan, NULL ); + Cnf_CutUpdateRefs( p, pCut, pCutFan, pCutRes ); + assert( pFan->nRefs == 0 ); + Cnf_CutFree( pCut ); + Cnf_CutFree( pCutFan ); + break; + } + } +} + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + +ABC_NAMESPACE_IMPL_END + |