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author | Alan Mishchenko <alanmi@berkeley.edu> | 2007-09-30 08:01:00 -0700 |
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committer | Alan Mishchenko <alanmi@berkeley.edu> | 2007-09-30 08:01:00 -0700 |
commit | e54d9691616b9a0326e2fdb3156bb4eeb8abfcd7 (patch) | |
tree | de3ffe87c3e17950351e3b7d97fa18318bd5ea9a /src/opt/lpk/lpkCut.c | |
parent | 7d7e60f2dc84393cd4c5db22d2eaf7b1fb1a79b2 (diff) | |
download | abc-e54d9691616b9a0326e2fdb3156bb4eeb8abfcd7.tar.gz abc-e54d9691616b9a0326e2fdb3156bb4eeb8abfcd7.tar.bz2 abc-e54d9691616b9a0326e2fdb3156bb4eeb8abfcd7.zip |
Version abc70930
Diffstat (limited to 'src/opt/lpk/lpkCut.c')
-rw-r--r-- | src/opt/lpk/lpkCut.c | 683 |
1 files changed, 0 insertions, 683 deletions
diff --git a/src/opt/lpk/lpkCut.c b/src/opt/lpk/lpkCut.c deleted file mode 100644 index b2a743bd..00000000 --- a/src/opt/lpk/lpkCut.c +++ /dev/null @@ -1,683 +0,0 @@ -/**CFile**************************************************************** - - FileName [lpkCut.c] - - SystemName [ABC: Logic synthesis and verification system.] - - PackageName [Fast Boolean matching for LUT structures.] - - Synopsis [] - - Author [Alan Mishchenko] - - Affiliation [UC Berkeley] - - Date [Ver. 1.0. Started - April 28, 2007.] - - Revision [$Id: lpkCut.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $] - -***********************************************************************/ - -#include "lpkInt.h" -#include "cloud.h" - -//////////////////////////////////////////////////////////////////////// -/// DECLARATIONS /// -//////////////////////////////////////////////////////////////////////// - -//////////////////////////////////////////////////////////////////////// -/// FUNCTION DEFINITIONS /// -//////////////////////////////////////////////////////////////////////// - -/**Function************************************************************* - - Synopsis [Computes the truth table of one cut.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -CloudNode * Lpk_CutTruthBdd_rec( CloudManager * dd, Hop_Man_t * pMan, Hop_Obj_t * pObj, int nVars ) -{ - CloudNode * pTruth, * pTruth0, * pTruth1; - assert( !Hop_IsComplement(pObj) ); - if ( pObj->pData ) - { - assert( ((unsigned)pObj->pData) & 0xffff0000 ); - return pObj->pData; - } - // get the plan for a new truth table - if ( Hop_ObjIsConst1(pObj) ) - pTruth = dd->one; - else - { - assert( Hop_ObjIsAnd(pObj) ); - // compute the truth tables of the fanins - pTruth0 = Lpk_CutTruthBdd_rec( dd, pMan, Hop_ObjFanin0(pObj), nVars ); - pTruth1 = Lpk_CutTruthBdd_rec( dd, pMan, Hop_ObjFanin1(pObj), nVars ); - pTruth0 = Cloud_NotCond( pTruth0, Hop_ObjFaninC0(pObj) ); - pTruth1 = Cloud_NotCond( pTruth1, Hop_ObjFaninC1(pObj) ); - // creat the truth table of the node - pTruth = Cloud_bddAnd( dd, pTruth0, pTruth1 ); - } - pObj->pData = pTruth; - return pTruth; -} - -/**Function************************************************************* - - Synopsis [Verifies that the factoring is correct.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -CloudNode * Lpk_CutTruthBdd( Lpk_Man_t * p, Lpk_Cut_t * pCut ) -{ - CloudManager * dd = p->pDsdMan->dd; - Hop_Man_t * pManHop = p->pNtk->pManFunc; - Hop_Obj_t * pObjHop; - Abc_Obj_t * pObj, * pFanin; - CloudNode * pTruth; - int i, k, iCount = 0; - -// return NULL; -// Lpk_NodePrintCut( p, pCut ); - // initialize the leaves - Lpk_CutForEachLeaf( p->pNtk, pCut, pObj, i ) - pObj->pCopy = (Abc_Obj_t *)dd->vars[pCut->nLeaves-1-i]; - - // construct truth table in the topological order - Lpk_CutForEachNodeReverse( p->pNtk, pCut, pObj, i ) - { - // get the local AIG - pObjHop = Hop_Regular(pObj->pData); - // clean the data field of the nodes in the AIG subgraph - Hop_ObjCleanData_rec( pObjHop ); - // set the initial truth tables at the fanins - Abc_ObjForEachFanin( pObj, pFanin, k ) - { - assert( ((unsigned)pFanin->pCopy) & 0xffff0000 ); - Hop_ManPi( pManHop, k )->pData = pFanin->pCopy; - } - // compute the truth table of internal nodes - pTruth = Lpk_CutTruthBdd_rec( dd, pManHop, pObjHop, pCut->nLeaves ); - if ( Hop_IsComplement(pObj->pData) ) - pTruth = Cloud_Not(pTruth); - // set the truth table at the node - pObj->pCopy = (Abc_Obj_t *)pTruth; - - } - -// Cloud_bddPrint( dd, pTruth ); -// printf( "Bdd size = %d. Total nodes = %d.\n", Cloud_DagSize( dd, pTruth ), dd->nNodesCur-dd->nVars-1 ); - return pTruth; -} - - -/**Function************************************************************* - - Synopsis [Computes the truth table of one cut.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -unsigned * Lpk_CutTruth_rec( Hop_Man_t * pMan, Hop_Obj_t * pObj, int nVars, Vec_Ptr_t * vTtNodes, int * piCount ) -{ - unsigned * pTruth, * pTruth0, * pTruth1; - assert( !Hop_IsComplement(pObj) ); - if ( pObj->pData ) - { - assert( ((unsigned)pObj->pData) & 0xffff0000 ); - return pObj->pData; - } - // get the plan for a new truth table - pTruth = Vec_PtrEntry( vTtNodes, (*piCount)++ ); - if ( Hop_ObjIsConst1(pObj) ) - Kit_TruthFill( pTruth, nVars ); - else - { - assert( Hop_ObjIsAnd(pObj) ); - // compute the truth tables of the fanins - pTruth0 = Lpk_CutTruth_rec( pMan, Hop_ObjFanin0(pObj), nVars, vTtNodes, piCount ); - pTruth1 = Lpk_CutTruth_rec( pMan, Hop_ObjFanin1(pObj), nVars, vTtNodes, piCount ); - // creat the truth table of the node - Kit_TruthAndPhase( pTruth, pTruth0, pTruth1, nVars, Hop_ObjFaninC0(pObj), Hop_ObjFaninC1(pObj) ); - } - pObj->pData = pTruth; - return pTruth; -} - -/**Function************************************************************* - - Synopsis [Computes the truth able of one cut.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -unsigned * Lpk_CutTruth( Lpk_Man_t * p, Lpk_Cut_t * pCut, int fInv ) -{ - Hop_Man_t * pManHop = p->pNtk->pManFunc; - Hop_Obj_t * pObjHop; - Abc_Obj_t * pObj, * pFanin; - unsigned * pTruth; - int i, k, iCount = 0; -// Lpk_NodePrintCut( p, pCut ); - assert( pCut->nNodes > 0 ); - - // initialize the leaves - Lpk_CutForEachLeaf( p->pNtk, pCut, pObj, i ) - pObj->pCopy = Vec_PtrEntry( p->vTtElems, fInv? pCut->nLeaves-1-i : i ); - - // construct truth table in the topological order - Lpk_CutForEachNodeReverse( p->pNtk, pCut, pObj, i ) - { - // get the local AIG - pObjHop = Hop_Regular(pObj->pData); - // clean the data field of the nodes in the AIG subgraph - Hop_ObjCleanData_rec( pObjHop ); - // set the initial truth tables at the fanins - Abc_ObjForEachFanin( pObj, pFanin, k ) - { - assert( ((unsigned)pFanin->pCopy) & 0xffff0000 ); - Hop_ManPi( pManHop, k )->pData = pFanin->pCopy; - } - // compute the truth table of internal nodes - pTruth = Lpk_CutTruth_rec( pManHop, pObjHop, pCut->nLeaves, p->vTtNodes, &iCount ); - if ( Hop_IsComplement(pObj->pData) ) - Kit_TruthNot( pTruth, pTruth, pCut->nLeaves ); - // set the truth table at the node - pObj->pCopy = (Abc_Obj_t *)pTruth; - } - - // make sure direct truth table is stored elsewhere (assuming the first call for direct truth!!!) - if ( fInv == 0 ) - { - pTruth = Vec_PtrEntry( p->vTtNodes, iCount++ ); - Kit_TruthCopy( pTruth, (unsigned *)pObj->pCopy, pCut->nLeaves ); - } - assert( iCount <= Vec_PtrSize(p->vTtNodes) ); - return pTruth; -} - - -/**Function************************************************************* - - Synopsis [Returns 1 if at least one entry has changed.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -void Lpk_NodeRecordImpact( Lpk_Man_t * p ) -{ - Lpk_Cut_t * pCut; - Vec_Ptr_t * vNodes = Vec_VecEntry( p->vVisited, p->pObj->Id ); - Abc_Obj_t * pNode; - int i, k; - // collect the nodes that impact the given node - Vec_PtrClear( vNodes ); - for ( i = 0; i < p->nCuts; i++ ) - { - pCut = p->pCuts + i; - for ( k = 0; k < (int)pCut->nLeaves; k++ ) - { - pNode = Abc_NtkObj( p->pNtk, pCut->pLeaves[k] ); - if ( pNode->fMarkC ) - continue; - pNode->fMarkC = 1; - Vec_PtrPush( vNodes, (void *)pNode->Id ); - Vec_PtrPush( vNodes, (void *)Abc_ObjFanoutNum(pNode) ); - } - } - // clear the marks - Vec_PtrForEachEntry( vNodes, pNode, i ) - { - pNode = Abc_NtkObj( p->pNtk, (int)pNode ); - pNode->fMarkC = 0; - i++; - } -//printf( "%d ", Vec_PtrSize(vNodes) ); -} - -/**Function************************************************************* - - Synopsis [Returns 1 if the cut has structural DSD.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -int Lpk_NodeCutsCheckDsd( Lpk_Man_t * p, Lpk_Cut_t * pCut ) -{ - Abc_Obj_t * pObj, * pFanin; - int i, k, nCands, fLeavesOnly, RetValue; - assert( pCut->nLeaves > 0 ); - // clear ref counters - memset( p->pRefs, 0, sizeof(int) * pCut->nLeaves ); - // mark cut leaves - Lpk_CutForEachLeaf( p->pNtk, pCut, pObj, i ) - { - assert( pObj->fMarkA == 0 ); - pObj->fMarkA = 1; - pObj->pCopy = (void *)i; - } - // ref leaves pointed from the internal nodes - nCands = 0; - Lpk_CutForEachNode( p->pNtk, pCut, pObj, i ) - { - fLeavesOnly = 1; - Abc_ObjForEachFanin( pObj, pFanin, k ) - if ( pFanin->fMarkA ) - p->pRefs[(int)pFanin->pCopy]++; - else - fLeavesOnly = 0; - if ( fLeavesOnly ) - p->pCands[nCands++] = pObj->Id; - } - // look at the nodes that only point to the leaves - RetValue = 0; - for ( i = 0; i < nCands; i++ ) - { - pObj = Abc_NtkObj( p->pNtk, p->pCands[i] ); - Abc_ObjForEachFanin( pObj, pFanin, k ) - { - assert( pFanin->fMarkA == 1 ); - if ( p->pRefs[(int)pFanin->pCopy] > 1 ) - break; - } - if ( k == Abc_ObjFaninNum(pObj) ) - { - RetValue = 1; - break; - } - } - // unmark cut leaves - Lpk_CutForEachLeaf( p->pNtk, pCut, pObj, i ) - pObj->fMarkA = 0; - return RetValue; -} - -/**Function************************************************************* - - Synopsis [Returns 1 if pDom is contained in pCut.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -static inline int Lpk_NodeCutsOneDominance( Lpk_Cut_t * pDom, Lpk_Cut_t * pCut ) -{ - int i, k; - for ( i = 0; i < (int)pDom->nLeaves; i++ ) - { - for ( k = 0; k < (int)pCut->nLeaves; k++ ) - if ( pDom->pLeaves[i] == pCut->pLeaves[k] ) - break; - if ( k == (int)pCut->nLeaves ) // node i in pDom is not contained in pCut - return 0; - } - // every node in pDom is contained in pCut - return 1; -} - -/**Function************************************************************* - - Synopsis [Check if the cut exists.] - - Description [Returns 1 if the cut exists.] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -int Lpk_NodeCutsOneFilter( Lpk_Cut_t * pCuts, int nCuts, Lpk_Cut_t * pCutNew ) -{ - Lpk_Cut_t * pCut; - int i, k; - assert( pCutNew->uSign[0] || pCutNew->uSign[1] ); - // try to find the cut - for ( i = 0; i < nCuts; i++ ) - { - pCut = pCuts + i; - if ( pCut->nLeaves == 0 ) - continue; - if ( pCut->nLeaves == pCutNew->nLeaves ) - { - if ( pCut->uSign[0] == pCutNew->uSign[0] && pCut->uSign[1] == pCutNew->uSign[1] ) - { - for ( k = 0; k < (int)pCutNew->nLeaves; k++ ) - if ( pCut->pLeaves[k] != pCutNew->pLeaves[k] ) - break; - if ( k == (int)pCutNew->nLeaves ) - return 1; - } - continue; - } - if ( pCut->nLeaves < pCutNew->nLeaves ) - { - // skip the non-contained cuts - if ( (pCut->uSign[0] & pCutNew->uSign[0]) != pCut->uSign[0] ) - continue; - if ( (pCut->uSign[1] & pCutNew->uSign[1]) != pCut->uSign[1] ) - continue; - // check containment seriously - if ( Lpk_NodeCutsOneDominance( pCut, pCutNew ) ) - return 1; - continue; - } - // check potential containment of other cut - - // skip the non-contained cuts - if ( (pCut->uSign[0] & pCutNew->uSign[0]) != pCutNew->uSign[0] ) - continue; - if ( (pCut->uSign[1] & pCutNew->uSign[1]) != pCutNew->uSign[1] ) - continue; - // check containment seriously - if ( Lpk_NodeCutsOneDominance( pCutNew, pCut ) ) - pCut->nLeaves = 0; // removed - } - return 0; -} - -/**Function************************************************************* - - Synopsis [Prints the given cut.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -void Lpk_NodePrintCut( Lpk_Man_t * p, Lpk_Cut_t * pCut, int fLeavesOnly ) -{ - Abc_Obj_t * pObj; - int i; - if ( !fLeavesOnly ) - printf( "LEAVES:\n" ); - Lpk_CutForEachLeaf( p->pNtk, pCut, pObj, i ) - printf( "%d,", pObj->Id ); - if ( !fLeavesOnly ) - { - printf( "\nNODES:\n" ); - Lpk_CutForEachNode( p->pNtk, pCut, pObj, i ) - { - printf( "%d,", pObj->Id ); - assert( Abc_ObjIsNode(pObj) ); - } - printf( "\n" ); - } -} - -/**Function************************************************************* - - Synopsis [Set the cut signature.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -void Lpk_NodeCutSignature( Lpk_Cut_t * pCut ) -{ - unsigned i; - pCut->uSign[0] = pCut->uSign[1] = 0; - for ( i = 0; i < pCut->nLeaves; i++ ) - { - pCut->uSign[(pCut->pLeaves[i] & 32) > 0] |= (1 << (pCut->pLeaves[i] & 31)); - if ( i != pCut->nLeaves - 1 ) - assert( pCut->pLeaves[i] < pCut->pLeaves[i+1] ); - } -} - - -/**Function************************************************************* - - Synopsis [Computes the set of all cuts.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -void Lpk_NodeCutsOne( Lpk_Man_t * p, Lpk_Cut_t * pCut, int Node ) -{ - Lpk_Cut_t * pCutNew; - Abc_Obj_t * pObj, * pFanin; - int i, k, j, nLeavesNew; -/* - printf( "Exploring cut " ); - Lpk_NodePrintCut( p, pCut, 1 ); - printf( "with node %d\n", Node ); -*/ - // check if the cut can stand adding one more internal node - if ( pCut->nNodes == LPK_SIZE_MAX ) - return; - - // if the node is a PI, quit - pObj = Abc_NtkObj( p->pNtk, Node ); - if ( Abc_ObjIsCi(pObj) ) - return; - assert( Abc_ObjIsNode(pObj) ); - assert( Abc_ObjFaninNum(pObj) <= p->pPars->nLutSize ); - - // if the node is not in the MFFC, check the limit - if ( !Abc_NodeIsTravIdCurrent(pObj) ) - { - if ( (int)pCut->nNodesDup == p->pPars->nLutsOver ) - return; - assert( (int)pCut->nNodesDup < p->pPars->nLutsOver ); - } - - // check the possibility of adding this node using the signature - nLeavesNew = pCut->nLeaves - 1; - Abc_ObjForEachFanin( pObj, pFanin, i ) - { - if ( (pCut->uSign[(pFanin->Id & 32) > 0] & (1 << (pFanin->Id & 31))) ) - continue; - if ( ++nLeavesNew > p->pPars->nVarsMax ) - return; - } - - // initialize the set of leaves to the nodes in the cut - assert( p->nCuts < LPK_CUTS_MAX ); - pCutNew = p->pCuts + p->nCuts; - pCutNew->nLeaves = 0; - for ( i = 0; i < (int)pCut->nLeaves; i++ ) - if ( pCut->pLeaves[i] != Node ) - pCutNew->pLeaves[pCutNew->nLeaves++] = pCut->pLeaves[i]; - - // add new nodes - Abc_ObjForEachFanin( pObj, pFanin, i ) - { - // find the place where this node belongs - for ( k = 0; k < (int)pCutNew->nLeaves; k++ ) - if ( pCutNew->pLeaves[k] >= pFanin->Id ) - break; - if ( k < (int)pCutNew->nLeaves && pCutNew->pLeaves[k] == pFanin->Id ) - continue; - // check if there is room - if ( (int)pCutNew->nLeaves == p->pPars->nVarsMax ) - return; - // move all the nodes - for ( j = pCutNew->nLeaves; j > k; j-- ) - pCutNew->pLeaves[j] = pCutNew->pLeaves[j-1]; - pCutNew->pLeaves[k] = pFanin->Id; - pCutNew->nLeaves++; - assert( pCutNew->nLeaves <= LPK_SIZE_MAX ); - - } - // skip the contained cuts - Lpk_NodeCutSignature( pCutNew ); - if ( Lpk_NodeCutsOneFilter( p->pCuts, p->nCuts, pCutNew ) ) - return; - - // update the set of internal nodes - assert( pCut->nNodes < LPK_SIZE_MAX ); - memcpy( pCutNew->pNodes, pCut->pNodes, pCut->nNodes * sizeof(int) ); - pCutNew->nNodes = pCut->nNodes; - pCutNew->nNodesDup = pCut->nNodesDup; - - // check if the node is already there - // if so, move the node to be the last - for ( i = 0; i < (int)pCutNew->nNodes; i++ ) - if ( pCutNew->pNodes[i] == Node ) - { - for ( k = i; k < (int)pCutNew->nNodes - 1; k++ ) - pCutNew->pNodes[k] = pCutNew->pNodes[k+1]; - pCutNew->pNodes[k] = Node; - break; - } - if ( i == (int)pCutNew->nNodes ) // new node - { - pCutNew->pNodes[ pCutNew->nNodes++ ] = Node; - pCutNew->nNodesDup += !Abc_NodeIsTravIdCurrent(pObj); - } - // the number of nodes does not exceed MFFC plus duplications - assert( pCutNew->nNodes <= p->nMffc + pCutNew->nNodesDup ); - // add the cut to storage - assert( p->nCuts < LPK_CUTS_MAX ); - p->nCuts++; -} - -/**Function************************************************************* - - Synopsis [Computes the set of all cuts.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -int Lpk_NodeCuts( Lpk_Man_t * p ) -{ - Lpk_Cut_t * pCut, * pCut2; - int i, k, Temp, nMffc, fChanges; - - // mark the MFFC of the node with the current trav ID - nMffc = p->nMffc = Abc_NodeMffcLabel( p->pObj ); - assert( nMffc > 0 ); - if ( nMffc == 1 ) - return 0; - - // initialize the first cut - pCut = p->pCuts; p->nCuts = 1; - pCut->nNodes = 0; - pCut->nNodesDup = 0; - pCut->nLeaves = 1; - pCut->pLeaves[0] = p->pObj->Id; - // assign the signature - Lpk_NodeCutSignature( pCut ); - - // perform the cut computation - for ( i = 0; i < p->nCuts; i++ ) - { - pCut = p->pCuts + i; - if ( pCut->nLeaves == 0 ) - continue; - - // try to expand the fanins of this cut - for ( k = 0; k < (int)pCut->nLeaves; k++ ) - { - // create a new cut - Lpk_NodeCutsOne( p, pCut, pCut->pLeaves[k] ); - // quit if the number of cuts has exceeded the limit - if ( p->nCuts == LPK_CUTS_MAX ) - break; - } - if ( p->nCuts == LPK_CUTS_MAX ) - break; - } - if ( p->nCuts == LPK_CUTS_MAX ) - p->nNodesOver++; - - // record the impact of this node - if ( p->pPars->fSatur ) - Lpk_NodeRecordImpact( p ); - - // compress the cuts by removing empty ones, those with negative Weight, and decomposable ones - p->nEvals = 0; - for ( i = 0; i < p->nCuts; i++ ) - { - pCut = p->pCuts + i; - if ( pCut->nLeaves < 2 ) - continue; - // compute the minimum number of LUTs needed to implement this cut - // V = N * (K-1) + 1 ~~~~~ N = Ceiling[(V-1)/(K-1)] = (V-1)/(K-1) + [(V-1)%(K-1) > 0] - pCut->nLuts = Lpk_LutNumLuts( pCut->nLeaves, p->pPars->nLutSize ); -// pCut->Weight = (float)1.0 * (pCut->nNodes - pCut->nNodesDup - 1) / pCut->nLuts; //p->pPars->nLutsMax; - pCut->Weight = (float)1.0 * (pCut->nNodes - pCut->nNodesDup) / pCut->nLuts; //p->pPars->nLutsMax; - if ( pCut->Weight <= 1.001 ) -// if ( pCut->Weight <= 0.999 ) - continue; - pCut->fHasDsd = Lpk_NodeCutsCheckDsd( p, pCut ); - if ( pCut->fHasDsd ) - continue; - p->pEvals[p->nEvals++] = i; - } - if ( p->nEvals == 0 ) - return 0; - - // sort the cuts by Weight - do { - fChanges = 0; - for ( i = 0; i < p->nEvals - 1; i++ ) - { - pCut = p->pCuts + p->pEvals[i]; - pCut2 = p->pCuts + p->pEvals[i+1]; - if ( pCut->Weight >= pCut2->Weight - 0.001 ) - continue; - Temp = p->pEvals[i]; - p->pEvals[i] = p->pEvals[i+1]; - p->pEvals[i+1] = Temp; - fChanges = 1; - } - } while ( fChanges ); -/* - for ( i = 0; i < p->nEvals; i++ ) - { - pCut = p->pCuts + p->pEvals[i]; - printf( "Cut %3d : W = %5.2f.\n", i, pCut->Weight ); - } - printf( "\n" ); -*/ - return 1; -} - -//////////////////////////////////////////////////////////////////////// -/// END OF FILE /// -//////////////////////////////////////////////////////////////////////// - - |