Exemple #1
0
/**Function*************************************************************

  Synopsis    []

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
int Dar_ManRewrite( Aig_Man_t * pAig, Dar_RwrPar_t * pPars )
{
    extern Vec_Int_t * Saig_ManComputeSwitchProbs( Aig_Man_t * p, int nFrames, int nPref, int fProbOne );
    Dar_Man_t * p;
//    Bar_Progress_t * pProgress;
    Dar_Cut_t * pCut;
    Aig_Obj_t * pObj, * pObjNew;
    int i, k, nNodesOld, nNodeBefore, nNodeAfter, Required;
    abctime clk = 0, clkStart;
    int Counter = 0;
    int nMffcSize;//, nMffcGains[MAX_VAL+1][MAX_VAL+1] = {{0}};
    // prepare the library
    Dar_LibPrepare( pPars->nSubgMax ); 
    // create rewriting manager
    p = Dar_ManStart( pAig, pPars );
    if ( pPars->fPower )
        pAig->vProbs = Saig_ManComputeSwitchProbs( pAig, 48, 16, 1 );
    // remove dangling nodes
    Aig_ManCleanup( pAig );
    // if updating levels is requested, start fanout and timing
    if ( p->pPars->fFanout )
        Aig_ManFanoutStart( pAig );
    if ( p->pPars->fUpdateLevel )
        Aig_ManStartReverseLevels( pAig, 0 );
    // set elementary cuts for the PIs
//    Dar_ManCutsStart( p );
    // resynthesize each node once
    clkStart = Abc_Clock();
    p->nNodesInit = Aig_ManNodeNum(pAig);
    nNodesOld = Vec_PtrSize( pAig->vObjs );

//    pProgress = Bar_ProgressStart( stdout, nNodesOld );
    Aig_ManForEachObj( pAig, pObj, i )
//    pProgress = Bar_ProgressStart( stdout, 100 );
//    Aig_ManOrderStart( pAig );
//    Aig_ManForEachNodeInOrder( pAig, pObj )
    {
        if ( pAig->Time2Quit && !(i & 256) && Abc_Clock() > pAig->Time2Quit )
            break;
//        Bar_ProgressUpdate( pProgress, 100*pAig->nAndPrev/pAig->nAndTotal, NULL );
//        Bar_ProgressUpdate( pProgress, i, NULL );
        if ( !Aig_ObjIsNode(pObj) )
            continue;
        if ( i > nNodesOld )
//        if ( p->pPars->fUseZeros && i > nNodesOld )
            break;
        if ( pPars->fRecycle && ++Counter % 50000 == 0 && Aig_DagSize(pObj) < Vec_PtrSize(p->vCutNodes)/100 )
        {
//            printf( "Counter = %7d.  Node = %7d.  Dag = %5d. Vec = %5d.\n", 
//                Counter, i, Aig_DagSize(pObj), Vec_PtrSize(p->vCutNodes) );
//            fflush( stdout );
            Dar_ManCutsRestart( p, pObj );
        }

        // consider freeing the cuts
//        if ( (i & 0xFFF) == 0 && Aig_MmFixedReadMemUsage(p->pMemCuts)/(1<<20) > 100 )
//            Dar_ManCutsStart( p );

        // compute cuts for the node
        p->nNodesTried++;
clk = Abc_Clock();
        Dar_ObjSetCuts( pObj, NULL );
        Dar_ObjComputeCuts_rec( p, pObj );
p->timeCuts += Abc_Clock() - clk;

        // check if there is a trivial cut
        Dar_ObjForEachCut( pObj, pCut, k )
            if ( pCut->nLeaves == 0 || (pCut->nLeaves == 1 && pCut->pLeaves[0] != pObj->Id && Aig_ManObj(p->pAig, pCut->pLeaves[0])) )
                break;
        if ( k < (int)pObj->nCuts )
        {
            assert( pCut->nLeaves < 2 );
            if ( pCut->nLeaves == 0 ) // replace by constant
            {
                assert( pCut->uTruth == 0 || pCut->uTruth == 0xFFFF );
                pObjNew = Aig_NotCond( Aig_ManConst1(p->pAig), pCut->uTruth==0 );
            }
            else
            {
                assert( pCut->uTruth == 0xAAAA || pCut->uTruth == 0x5555 );
                pObjNew = Aig_NotCond( Aig_ManObj(p->pAig, pCut->pLeaves[0]), pCut->uTruth==0x5555 );
            }
            // remove the old cuts
            Dar_ObjSetCuts( pObj, NULL );
            // replace the node
            Aig_ObjReplace( pAig, pObj, pObjNew, p->pPars->fUpdateLevel );
            continue;
        }

        // evaluate the cuts
        p->GainBest = -1;
        nMffcSize   = -1;
        Required    = pAig->vLevelR? Aig_ObjRequiredLevel(pAig, pObj) : ABC_INFINITY;
        Dar_ObjForEachCut( pObj, pCut, k )
        {
            int nLeavesOld = pCut->nLeaves;
            if ( pCut->nLeaves == 3 )
                pCut->pLeaves[pCut->nLeaves++] = 0;
            Dar_LibEval( p, pObj, pCut, Required, &nMffcSize );
            pCut->nLeaves = nLeavesOld; 
        }
        // check the best gain
        if ( !(p->GainBest > 0 || (p->GainBest == 0 && p->pPars->fUseZeros)) )
        {
//            Aig_ObjOrderAdvance( pAig );
            continue;
        }
//        nMffcGains[p->GainBest < MAX_VAL ? p->GainBest : MAX_VAL][nMffcSize < MAX_VAL ? nMffcSize : MAX_VAL]++;
        // remove the old cuts
        Dar_ObjSetCuts( pObj, NULL );
        // if we end up here, a rewriting step is accepted
        nNodeBefore = Aig_ManNodeNum( pAig );
        pObjNew = Dar_LibBuildBest( p ); // pObjNew can be complemented!
        pObjNew = Aig_NotCond( pObjNew, Aig_ObjPhaseReal(pObjNew) ^ pObj->fPhase );
        assert( (int)Aig_Regular(pObjNew)->Level <= Required );
        // replace the node
        Aig_ObjReplace( pAig, pObj, pObjNew, p->pPars->fUpdateLevel );
        // compare the gains
        nNodeAfter = Aig_ManNodeNum( pAig );
        assert( p->GainBest <= nNodeBefore - nNodeAfter );
        // count gains of this class
        p->ClassGains[p->ClassBest] += nNodeBefore - nNodeAfter;
    }
/**Function*************************************************************

  Synopsis    []

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
int Dar_ManRewrite( Aig_Man_t * pAig, Dar_RwrPar_t * pPars )
{
    Dar_Man_t * p;
    ProgressBar * pProgress;
    Dar_Cut_t * pCut;
    Aig_Obj_t * pObj, * pObjNew;
    int i, k, nNodesOld, nNodeBefore, nNodeAfter, Required;
    int clk = 0, clkStart;
    // prepare the library
    Dar_LibPrepare( pPars->nSubgMax ); 
    // create rewriting manager
    p = Dar_ManStart( pAig, pPars );
    // remove dangling nodes
    Aig_ManCleanup( pAig );
    // if updating levels is requested, start fanout and timing
    if ( p->pPars->fFanout )
        Aig_ManFanoutStart( pAig );
    if ( p->pPars->fUpdateLevel )
        Aig_ManStartReverseLevels( pAig, 0 );
    // set elementary cuts for the PIs
    Dar_ManCutsStart( p );
    // resynthesize each node once
    clkStart = clock();
    p->nNodesInit = Aig_ManNodeNum(pAig);
    nNodesOld = Vec_PtrSize( pAig->vObjs );

    pProgress = Extra_ProgressBarStart( stdout, nNodesOld );
    Aig_ManForEachObj( pAig, pObj, i )
//    pProgress = Extra_ProgressBarStart( stdout, 100 );
//    Aig_ManOrderStart( pAig );
//    Aig_ManForEachNodeInOrder( pAig, pObj )
    {
//        Extra_ProgressBarUpdate( pProgress, 100*pAig->nAndPrev/pAig->nAndTotal, NULL );

        Extra_ProgressBarUpdate( pProgress, i, NULL );
        if ( !Aig_ObjIsNode(pObj) )
            continue;
        if ( i > nNodesOld )
            break;

        // consider freeing the cuts
//        if ( (i & 0xFFF) == 0 && Aig_MmFixedReadMemUsage(p->pMemCuts)/(1<<20) > 100 )
//            Dar_ManCutsStart( p );

        // compute cuts for the node
        p->nNodesTried++;
clk = clock();
        Dar_ObjComputeCuts_rec( p, pObj );
p->timeCuts += clock() - clk;

        // check if there is a trivial cut
        Dar_ObjForEachCut( pObj, pCut, k )
            if ( pCut->nLeaves == 0 || (pCut->nLeaves == 1 && pCut->pLeaves[0] != pObj->Id && Aig_ManObj(p->pAig, pCut->pLeaves[0])) )
                break;
        if ( k < (int)pObj->nCuts )
        {
            assert( pCut->nLeaves < 2 );
            if ( pCut->nLeaves == 0 ) // replace by constant
            {
                assert( pCut->uTruth == 0 || pCut->uTruth == 0xFFFF );
                pObjNew = Aig_NotCond( Aig_ManConst1(p->pAig), pCut->uTruth==0 );
            }
            else
            {
                assert( pCut->uTruth == 0xAAAA || pCut->uTruth == 0x5555 );
                pObjNew = Aig_NotCond( Aig_ManObj(p->pAig, pCut->pLeaves[0]), pCut->uTruth==0x5555 );
            }
            // remove the old cuts
            Dar_ObjSetCuts( pObj, NULL );
            // replace the node
            Aig_ObjReplace( pAig, pObj, pObjNew, 1, p->pPars->fUpdateLevel );
            continue;
        }

        // evaluate the cuts
        p->GainBest = -1;
        Required = pAig->vLevelR? Aig_ObjRequiredLevel(pAig, pObj) : AIG_INFINITY;
        Dar_ObjForEachCut( pObj, pCut, k )
            Dar_LibEval( p, pObj, pCut, Required );
        // check the best gain
        if ( !(p->GainBest > 0 || (p->GainBest == 0 && p->pPars->fUseZeros)) )
        {
//            Aig_ObjOrderAdvance( pAig );
            continue;
        }
        // remove the old cuts
        Dar_ObjSetCuts( pObj, NULL );
        // if we end up here, a rewriting step is accepted
        nNodeBefore = Aig_ManNodeNum( pAig );
        pObjNew = Dar_LibBuildBest( p ); // pObjNew can be complemented!
        pObjNew = Aig_NotCond( pObjNew, Aig_ObjPhaseReal(pObjNew) ^ pObj->fPhase );
        assert( (int)Aig_Regular(pObjNew)->Level <= Required );
        // replace the node
        Aig_ObjReplace( pAig, pObj, pObjNew, 1, p->pPars->fUpdateLevel );
        // compare the gains
        nNodeAfter = Aig_ManNodeNum( pAig );
        assert( p->GainBest <= nNodeBefore - nNodeAfter );
        // count gains of this class
        p->ClassGains[p->ClassBest] += nNodeBefore - nNodeAfter;
    }