giaSpeedup.c 27.2 KB
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/**CFile****************************************************************

  FileName    [gia.c]

  SystemName  [ABC: Logic synthesis and verification system.]

  PackageName [Scalable AIG package.]

  Synopsis    []

  Author      [Alan Mishchenko]
  
  Affiliation [UC Berkeley]

  Date        [Ver. 1.0. Started - June 20, 2005.]

  Revision    [$Id: gia.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]

***********************************************************************/

#include "gia.h"
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#include "map/if/if.h"
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ABC_NAMESPACE_IMPL_START


////////////////////////////////////////////////////////////////////////
///                        DECLARATIONS                              ///
////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////
///                     FUNCTION DEFINITIONS                         ///
////////////////////////////////////////////////////////////////////////

/**Function*************************************************************

  Synopsis    [Sorts the pins in the decreasing order of delays.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
void Gia_LutDelayTraceSortPins( Gia_Man_t * p, int iObj, int * pPinPerm, float * pPinDelays )
{
    int iFanin, i, j, best_i, temp;
    assert( Gia_ObjIsLut(p, iObj) );
    // start the trivial permutation and collect pin delays
    Gia_LutForEachFanin( p, iObj, iFanin, i )
    {
        pPinPerm[i] = i;
        pPinDelays[i] = Gia_ObjTimeArrival(p, iFanin);
    }
    // selection sort the pins in the decreasible order of delays
    // this order will match the increasing order of LUT input pins
    for ( i = 0; i < Gia_ObjLutSize(p, iObj)-1; i++ )
    {
        best_i = i;
        for ( j = i+1; j < Gia_ObjLutSize(p, iObj); j++ )
            if ( pPinDelays[pPinPerm[j]] > pPinDelays[pPinPerm[best_i]] )
                best_i = j;
        if ( best_i == i )
            continue;
        temp = pPinPerm[i]; 
        pPinPerm[i] = pPinPerm[best_i]; 
        pPinPerm[best_i] = temp;
    }
    // verify
    assert( Gia_ObjLutSize(p, iObj) == 0 || pPinPerm[0] < Gia_ObjLutSize(p, iObj) );
    for ( i = 1; i < Gia_ObjLutSize(p, iObj); i++ )
    {
        assert( pPinPerm[i] < Gia_ObjLutSize(p, iObj) );
        assert( pPinDelays[pPinPerm[i-1]] >= pPinDelays[pPinPerm[i]] );
    }
}

/**Function*************************************************************

  Synopsis    [Sorts the pins in the decreasing order of delays.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
int Gia_LutWhereIsPin( Gia_Man_t * p, int iFanout, int iFanin, int * pPinPerm )
{
    int i;
    for ( i = 0; i < Gia_ObjLutSize(p, iFanout); i++ )
        if ( Gia_ObjLutFanin(p, iFanout, pPinPerm[i]) == iFanin )
            return i;
    return -1;
}

/**Function*************************************************************

  Synopsis    [Computes the arrival times for the given object.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
float Gia_ObjComputeArrival( Gia_Man_t * p, int iObj, int fUseSorting )
{
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    If_LibLut_t * pLutLib = (If_LibLut_t *)p->pLutLib;
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    Gia_Obj_t * pObj = Gia_ManObj( p, iObj );
    int k, iFanin, pPinPerm[32];
    float pPinDelays[32];
    float tArrival, * pDelays;
    if ( Gia_ObjIsCi(pObj) )
        return Gia_ObjTimeArrival(p, iObj);
    if ( Gia_ObjIsCo(pObj) )
        return Gia_ObjTimeArrival(p, Gia_ObjFaninId0p(p, pObj) );
    assert( Gia_ObjIsLut(p, iObj) );
    tArrival = -TIM_ETERNITY;
    if ( pLutLib == NULL )
    {
        Gia_LutForEachFanin( p, iObj, iFanin, k )
            if ( tArrival < Gia_ObjTimeArrival(p, iFanin) + 1.0 )
                tArrival = Gia_ObjTimeArrival(p, iFanin) + 1.0;
    }
    else if ( !pLutLib->fVarPinDelays )
    {
        pDelays = pLutLib->pLutDelays[Gia_ObjLutSize(p, iObj)];
        Gia_LutForEachFanin( p, iObj, iFanin, k )
            if ( tArrival < Gia_ObjTimeArrival(p, iFanin) + pDelays[0] )
                tArrival = Gia_ObjTimeArrival(p, iFanin) + pDelays[0];
    }
    else
    {
        pDelays = pLutLib->pLutDelays[Gia_ObjLutSize(p, iObj)];
        if ( fUseSorting )
        {
            Gia_LutDelayTraceSortPins( p, iObj, pPinPerm, pPinDelays );
            Gia_LutForEachFanin( p, iObj, iFanin, k ) 
                if ( tArrival < Gia_ObjTimeArrival( p, Gia_ObjLutFanin(p,iObj,pPinPerm[k])) + pDelays[k] )
                    tArrival = Gia_ObjTimeArrival( p, Gia_ObjLutFanin(p,iObj,pPinPerm[k])) + pDelays[k];
        }
        else
        {
            Gia_LutForEachFanin( p, iObj, iFanin, k )
                if ( tArrival < Gia_ObjTimeArrival(p, iFanin) + pDelays[k] )
                    tArrival = Gia_ObjTimeArrival(p, iFanin) + pDelays[k];
        }
    }
    if ( Gia_ObjLutSize(p, iObj) == 0 )
        tArrival = 0.0;
    return tArrival;
}


/**Function*************************************************************

  Synopsis    [Propagates the required times through the given node.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
float Gia_ObjPropagateRequired( Gia_Man_t * p, int iObj, int fUseSorting )
{
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    If_LibLut_t * pLutLib = (If_LibLut_t *)p->pLutLib;
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    int k, iFanin, pPinPerm[32];
    float pPinDelays[32];
    float tRequired = 0.0; // Suppress "might be used uninitialized"
    float * pDelays;
    assert( Gia_ObjIsLut(p, iObj) );
    if ( pLutLib == NULL )
    {
        tRequired = Gia_ObjTimeRequired( p, iObj) - (float)1.0;
        Gia_LutForEachFanin( p, iObj, iFanin, k )
            if ( Gia_ObjTimeRequired(p, iFanin) > tRequired )
                Gia_ObjSetTimeRequired( p, iFanin, tRequired );
    }
    else if ( !pLutLib->fVarPinDelays )
    {
        pDelays = pLutLib->pLutDelays[Gia_ObjLutSize(p, iObj)];
        tRequired = Gia_ObjTimeRequired(p, iObj) - pDelays[0];
        Gia_LutForEachFanin( p, iObj, iFanin, k )
            if ( Gia_ObjTimeRequired(p, iFanin) > tRequired )
                Gia_ObjSetTimeRequired( p, iFanin, tRequired );
    }
    else 
    {
        pDelays = pLutLib->pLutDelays[Gia_ObjLutSize(p, iObj)];
        if ( fUseSorting )
        {
            Gia_LutDelayTraceSortPins( p, iObj, pPinPerm, pPinDelays );
            Gia_LutForEachFanin( p, iObj, iFanin, k )
            {
                tRequired = Gia_ObjTimeRequired( p, iObj) - pDelays[k];
                if ( Gia_ObjTimeRequired( p, Gia_ObjLutFanin(p, iObj,pPinPerm[k])) > tRequired )
                    Gia_ObjSetTimeRequired( p,  Gia_ObjLutFanin(p, iObj,pPinPerm[k]), tRequired );
            }
        }
        else
        {
            Gia_LutForEachFanin( p, iObj, iFanin, k )
            {
                tRequired = Gia_ObjTimeRequired(p, iObj) - pDelays[k];
                if ( Gia_ObjTimeRequired(p, iFanin) > tRequired )
                    Gia_ObjSetTimeRequired( p,  iFanin, tRequired );
            }
        }
    }
    return tRequired;
}

/**Function*************************************************************

  Synopsis    [Computes the delay trace of the given network.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
float Gia_ManDelayTraceLut( Gia_Man_t * p )
{
    int fUseSorting = 1;
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    If_LibLut_t * pLutLib = (If_LibLut_t *)p->pLutLib;
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    Vec_Int_t * vObjs;
    Gia_Obj_t * pObj;
    float tArrival, tArrivalCur, tRequired, tSlack;
    int i, iObj;

    // get the library
    if ( pLutLib && pLutLib->LutMax < Gia_ManLutSizeMax(p) )
    {
        printf( "The max LUT size (%d) is less than the max fanin count (%d).\n", 
            pLutLib->LutMax, Gia_ManLutSizeMax(p) );
        return -TIM_ETERNITY;
    }

    // initialize the arrival times
    Gia_ManTimeStart( p );

    // propagate arrival times
    if ( p->pManTime )
        Tim_ManIncrementTravId( (Tim_Man_t *)p->pManTime );
    Gia_ManForEachObj( p, pObj, i )
    {
        if ( !Gia_ObjIsCi(pObj) && !Gia_ObjIsCo(pObj) && !Gia_ObjIsLut(p, i) )
            continue;
        tArrival = Gia_ObjComputeArrival( p, i, fUseSorting );
        if ( Gia_ObjIsCi(pObj) && p->pManTime )
        {
            tArrival = Tim_ManGetCiArrival( (Tim_Man_t *)p->pManTime, Gia_ObjCioId(pObj) );
//printf( "%.3f  ", tArrival );
        }
        if ( Gia_ObjIsCo(pObj) && p->pManTime )
            Tim_ManSetCoArrival( (Tim_Man_t *)p->pManTime, Gia_ObjCioId(pObj), tArrival );
        Gia_ObjSetTimeArrival( p, i, tArrival );
    }

    // get the latest arrival times
    tArrival = -TIM_ETERNITY;
    Gia_ManForEachCo( p, pObj, i )
    {
        tArrivalCur = Gia_ObjTimeArrivalObj( p, Gia_ObjFanin0(pObj) );
        Gia_ObjSetTimeArrival( p, Gia_ObjId(p,pObj), tArrivalCur );
        if ( tArrival < tArrivalCur )
            tArrival = tArrivalCur;
    }

    // initialize the required times
    if ( p->pManTime )
    {
        Tim_ManIncrementTravId( (Tim_Man_t *)p->pManTime );
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        Tim_ManInitPoRequiredAll( (Tim_Man_t *)p->pManTime, tArrival );
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    }
    else
    {
        Gia_ManForEachCo( p, pObj, i )
            Gia_ObjSetTimeRequiredObj( p, pObj, tArrival );
    }

    // propagate the required times
    vObjs = Gia_ManOrderReverse( p );
    Vec_IntForEachEntry( vObjs, iObj, i )
    {
        pObj = Gia_ManObj(p, iObj);
        if ( Gia_ObjIsLut(p, iObj) )
        {
            Gia_ObjPropagateRequired( p, iObj, fUseSorting );
        }
        else if ( Gia_ObjIsCi(pObj) )
        {
            if ( p->pManTime )
                Tim_ManSetCiRequired( (Tim_Man_t *)p->pManTime, Gia_ObjCioId(pObj), Gia_ObjTimeRequired(p, iObj) );
        }
        else if ( Gia_ObjIsCo(pObj) )
        {
            if ( p->pManTime )
            {
                tRequired = Tim_ManGetCoRequired( (Tim_Man_t *)p->pManTime, Gia_ObjCioId(pObj) );
                Gia_ObjSetTimeRequired( p, iObj, tRequired );
            }
            if ( Gia_ObjTimeRequired(p, Gia_ObjFaninId0p(p, pObj)) > Gia_ObjTimeRequired(p, iObj) )
                Gia_ObjSetTimeRequired(p, Gia_ObjFaninId0p(p, pObj), Gia_ObjTimeRequired(p, iObj) );
        }

        // set slack for this object
        tSlack = Gia_ObjTimeRequired(p, iObj) - Gia_ObjTimeArrival(p, iObj);
        assert( tSlack + 0.01 > 0.0 );
        Gia_ObjSetTimeSlack( p, iObj, tSlack < 0.0 ? 0.0 : tSlack );
    }
    Vec_IntFree( vObjs );
    return tArrival;
}

#if 0

/**Function*************************************************************

  Synopsis    [Computes the required times for the given node.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
float Gia_ObjComputeRequired( Gia_Man_t * p, int iObj, int fUseSorting )
{
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    If_LibLut_t * pLutLib = p->pLutLib;
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    int pPinPerm[32];
    float pPinDelays[32];
    Gia_Obj_t * pFanout;
    float tRequired, tDelay, * pDelays;
    int k, iFanin;
    if ( Gia_ObjIsCo(iObj) )
        return Gia_ObjTimeRequired( p, iObj);
    tRequired = TIM_ETERNITY;
    if ( pLutLib == NULL )
    {
        Gia_ObjForEachFanout( iObj, pFanout, k )
        {
            tDelay = Gia_ObjIsCo(pFanout)? 0.0 : 1.0;
            if ( tRequired > Gia_ObjTimeRequired( p, pFanout) - tDelay )
                tRequired = Gia_ObjTimeRequired( p, pFanout) - tDelay;
        }
    }
    else if ( !pLutLib->fVarPinDelays )
    {
        Gia_ObjForEachFanout( iObj, pFanout, k )
        {
            pDelays = pLutLib->pLutDelays[Gia_ObjLutSize(p, pFanout)];
            tDelay = Gia_ObjIsCo(pFanout)? 0.0 : pDelays[0];
            if ( tRequired > Gia_ObjTimeRequired( p, pFanout) - tDelay )
                tRequired = Gia_ObjTimeRequired( p, pFanout) - tDelay;
        }
    }
    else
    {
        if ( fUseSorting )
        {
            Gia_ObjForEachFanout( iObj, pFanout, k ) 
            {
                pDelays = pLutLib->pLutDelays[Gia_ObjLutSize(p, pFanout)];
                Gia_LutDelayTraceSortPins( p, pFanout, pPinPerm, pPinDelays );
                iFanin = Gia_LutWhereIsPin( p, pFanout, iObj, pPinPerm );
                assert( Gia_ObjLutFanin( p, pFanout, pPinPerm[iFanin]) == iObj );
                tDelay = Gia_ObjIsCo(pFanout)? 0.0 : pDelays[iFanin];
                if ( tRequired > Gia_ObjTimeRequired( p, pFanout) - tDelay )
                    tRequired = Gia_ObjTimeRequired( p, pFanout) - tDelay;
            }
        }
        else
        {
            Gia_ObjForEachFanout( iObj, pFanout, k )
            {
                pDelays = pLutLib->pLutDelays[Gia_ObjLutSize(p, pFanout)];
                iFanin = Gia_ObjFindFanin( p, pFanout, iObj );
                assert( Gia_ObjLutFanin(p, pFanout, iFanin) == iObj );
                tDelay = Gia_ObjIsCo(pFanout)? 0.0 : pDelays[iFanin];
                if ( tRequired > Gia_ObjTimeRequired( p, pFanout) - tDelay )
                    tRequired = Gia_ObjTimeRequired( p, pFanout) - tDelay;
            }
        }
    }
    return tRequired;
}

/**Function*************************************************************

  Synopsis    [Computes the arrival times for the given node.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
int Gia_LutVerifyTiming(  Gia_Man_t * p )
{
    int iObj;
    float tArrival, tRequired;
    int i;
    Gia_LutForEachObj( p, iObj, i )
    {
        if ( Gia_ObjIsCi(iObj) && Gia_ObjFanoutNum(iObj) == 0 )
            continue;
        tArrival = Gia_ObjComputeArrival( p, iObj, 1 );
        tRequired = Gia_ObjComputeRequired( p, iObj, 1 );
        if ( !Gia_LutTimeEqual( tArrival, Gia_ObjTimeArrival( p, iObj), (float)0.01 ) )
            printf( "Gia_LutVerifyTiming(): Object %d has different arrival time (%.2f) from computed (%.2f).\n", 
                iObj->Id, Gia_ObjTimeArrival( p, iObj), tArrival );
        if ( !Gia_LutTimeEqual( tRequired, Gia_ObjTimeRequired( p, iObj), (float)0.01 ) )
            printf( "Gia_LutVerifyTiming(): Object %d has different required time (%.2f) from computed (%.2f).\n", 
                iObj->Id, Gia_ObjTimeRequired( p, iObj), tRequired );
    }
    return 1;
}

#endif

/**Function*************************************************************

  Synopsis    [Prints the delay trace for the given network.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
float Gia_ManDelayTraceLutPrint( Gia_Man_t * p, int fVerbose )
{
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    If_LibLut_t * pLutLib = (If_LibLut_t *)p->pLutLib;
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    int i, Nodes, * pCounters;
    float tArrival, tDelta, nSteps, Num;
    // get the library
    if ( pLutLib && pLutLib->LutMax < Gia_ManLutSizeMax(p) )
    {
        printf( "The max LUT size (%d) is less than the max fanin count (%d).\n", 
            pLutLib->LutMax, Gia_ManLutSizeMax(p) );
        return -ABC_INFINITY;
    }
    // decide how many steps
    nSteps = pLutLib ? 20 : Gia_ManLutLevel(p);
    pCounters = ABC_ALLOC( int, nSteps + 1 );
    memset( pCounters, 0, sizeof(int)*(nSteps + 1) );
    // perform delay trace
    tArrival = Gia_ManDelayTraceLut( p );
    tDelta   = tArrival / nSteps;
    // count how many nodes have slack in the corresponding intervals
    Gia_ManForEachLut( p, i )
    {
        if ( Gia_ObjLutSize(p, i) == 0 )
            continue;
        Num = Gia_ObjTimeSlack(p, i) / tDelta;
        if ( Num > nSteps )
            continue;
        assert( Num >=0 && Num <= nSteps );
        pCounters[(int)Num]++;
    }
    // print the results    
    if ( fVerbose )
    {
        printf( "Max delay = %6.2f. Delay trace using %s model:\n", tArrival, pLutLib? "LUT library" : "unit-delay" );
        Nodes = 0;
        for ( i = 0; i < nSteps; i++ )
        {
            Nodes += pCounters[i];
            printf( "%3d %s : %5d  (%6.2f %%)\n", pLutLib? 5*(i+1) : i+1, 
                pLutLib? "%":"lev", Nodes, 100.0*Nodes/Gia_ManLutNum(p) );
        }
    }
    ABC_FREE( pCounters );
    Gia_ManTimeStop( p );
    return tArrival;
}

/**Function*************************************************************

  Synopsis    [Determines timing-critical edges of the node.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
unsigned Gia_LutDelayTraceTCEdges( Gia_Man_t * p, int iObj, float tDelta )
{
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    If_LibLut_t * pLutLib = (If_LibLut_t *)p->pLutLib;
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    int pPinPerm[32];
    float pPinDelays[32];
    float tRequired, * pDelays;
    unsigned uResult = 0;
    int k, iFanin;
    tRequired = Gia_ObjTimeRequired( p, iObj );
    if ( pLutLib == NULL )
    {
        Gia_LutForEachFanin( p, iObj, iFanin, k )
            if ( tRequired < Gia_ObjTimeArrival(p, iFanin) + 1.0 + tDelta )
                uResult |= (1 << k);
    }
    else if ( !pLutLib->fVarPinDelays )
    {
        pDelays = pLutLib->pLutDelays[Gia_ObjLutSize(p, iObj)];
        Gia_LutForEachFanin( p, iObj, iFanin, k )
            if ( tRequired < Gia_ObjTimeArrival(p, iFanin) + pDelays[0] + tDelta )
                uResult |= (1 << k);
    }
    else
    {
        pDelays = pLutLib->pLutDelays[Gia_ObjLutSize(p, iObj)];
        Gia_LutDelayTraceSortPins( p, iObj, pPinPerm, pPinDelays );
        Gia_LutForEachFanin( p, iObj, iFanin, k )
            if ( tRequired < Gia_ObjTimeArrival( p, Gia_ObjLutFanin(p, iObj,pPinPerm[k])) + pDelays[k] + tDelta )
                uResult |= (1 << pPinPerm[k]);
    }
    return uResult;
}

/**Function*************************************************************

  Synopsis    [Adds strashed nodes for one node.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
int Gia_ManSpeedupObj_rec( Gia_Man_t * p, Gia_Obj_t * pObj, Vec_Int_t * vNodes )
{
    if ( Gia_ObjIsTravIdCurrent(p, pObj) )
        return 1;
    Gia_ObjSetTravIdCurrent( p, pObj );
    if ( Gia_ObjIsCi(pObj) )
        return 0;
    assert( Gia_ObjIsAnd(pObj) );
    if ( !Gia_ManSpeedupObj_rec( p, Gia_ObjFanin0(pObj), vNodes ) )
        return 0;
    if ( !Gia_ManSpeedupObj_rec( p, Gia_ObjFanin1(pObj), vNodes ) )
        return 0;
    Vec_IntPush( vNodes, Gia_ObjId(p, pObj) );
    return 1;
}

/**Function*************************************************************

  Synopsis    [Adds strashed nodes for one node.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
void Gia_ManSpeedupObj( Gia_Man_t * pNew, Gia_Man_t * p, Gia_Obj_t * pObj, Vec_Int_t * vLeaves, Vec_Int_t * vTimes )
{
    Vec_Int_t * vNodes;
    Gia_Obj_t * pTemp = NULL;
    int pCofs[32], nCofs, nSkip, i, k, iResult, iObj;
    // mark the leaves
    Gia_ManIncrementTravId( p );
    Gia_ObjSetTravIdCurrent( p, Gia_ManConst0(p) );
    Gia_ManForEachObjVec( vLeaves, p, pTemp, i )
        Gia_ObjSetTravIdCurrent( p, pTemp );
    // collect the AIG nodes
    vNodes = Vec_IntAlloc( 100 );
    if ( !Gia_ManSpeedupObj_rec( p, pObj, vNodes ) )
    {
        printf( "Bad node!!!\n" );
        Vec_IntFree( vNodes );
        return;
    }
    // derive cofactors
    nCofs = (1 << Vec_IntSize(vTimes));
    for ( i = 0; i < nCofs; i++ )
    {
        Gia_ManForEachObjVec( vLeaves, p, pTemp, k )
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            pTemp->Value = Abc_Var2Lit( Gia_ObjId(p, pTemp), 0 );
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        Gia_ManForEachObjVec( vTimes, p, pTemp, k )
            pTemp->Value = ((i & (1<<k)) != 0);
        Gia_ManForEachObjVec( vNodes, p, pTemp, k )
            pTemp->Value = Gia_ManHashAnd( pNew, Gia_ObjFanin0Copy(pTemp), Gia_ObjFanin1Copy(pTemp) );
        pCofs[i] = pTemp->Value;
    }
    Vec_IntFree( vNodes );
    // collect the resulting tree
    Gia_ManForEachObjVec( vTimes, p, pTemp, k )
        for ( nSkip = (1<<k), i = 0; i < nCofs; i += 2*nSkip )
            pCofs[i] = Gia_ManHashMux( pNew, Gia_ObjToLit(p,pTemp), pCofs[i+nSkip], pCofs[i] );
    // create choice node  (pObj is repr and ppCofs[0] is new)
    iObj    = Gia_ObjId( p, pObj );
609
    iResult = Abc_Lit2Var( pCofs[0] );
610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805
    if ( iResult <= iObj )
        return;
    Gia_ObjSetRepr( pNew, iResult, iObj );
    Gia_ObjSetNext( pNew, iResult, Gia_ObjNext(pNew, iObj) );
    Gia_ObjSetNext( pNew, iObj, iResult );
}

/**Function*************************************************************

  Synopsis    [Adds choices to speed up the network by the given percentage.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
Gia_Man_t * Gia_ManSpeedup( Gia_Man_t * p, int Percentage, int Degree, int fVerbose, int fVeryVerbose )
{
    Gia_Man_t * pNew, * pTemp;
    Vec_Int_t * vTimeCries, * vTimeFanins;
    int iObj, iFanin, iFanin2, nNodesNew;
    float tDelta, tArrival;
    int i, k, k2, Counter, CounterRes, nTimeCris;
    int fUseLutLib = (p->pLutLib != NULL);
    void * pTempTim = NULL;
    unsigned * puTCEdges;
    assert( p->pMapping != NULL );
    if ( !fUseLutLib && p->pManTime )
    {
        pTempTim = p->pManTime;
        p->pManTime = Tim_ManDup( (Tim_Man_t *)pTempTim, 1 );
    }
    // perform delay trace
    tArrival = Gia_ManDelayTraceLut( p );
    tDelta = fUseLutLib ? tArrival*Percentage/100.0 : 1.0;
    if ( fVerbose )
    {
        printf( "Max delay = %.2f. Delta = %.2f. ", tArrival, tDelta );
        printf( "Using %s model. ", fUseLutLib ? "LUT library" : "unit-delay" );
        if ( fUseLutLib )
            printf( "Percentage = %d. ", Percentage );
        printf( "\n" );
    }
    // mark the timing critical nodes and edges
    puTCEdges = ABC_CALLOC( unsigned, Gia_ManObjNum(p) );
    Gia_ManForEachLut( p, iObj )
    {
        if ( Gia_ObjTimeSlack(p, iObj) >= tDelta )
            continue;
        puTCEdges[iObj] = Gia_LutDelayTraceTCEdges( p, iObj, tDelta );
    }
    if ( fVerbose )
    {
        Counter = CounterRes = 0;
        Gia_ManForEachLut( p, iObj )
        {
            Gia_LutForEachFanin( p, iObj, iFanin, k )
                if ( !Gia_ObjIsCi(Gia_ManObj(p, iFanin)) && Gia_ObjTimeSlack(p, iFanin) < tDelta )
                    Counter++;
            CounterRes += Gia_WordCountOnes( puTCEdges[iObj] );
        }
        printf( "Edges: Total = %7d. 0-slack = %7d. Critical = %7d. Ratio = %4.2f\n", 
            Gia_ManLutFaninCount(p), Counter, CounterRes, Counter? 1.0*CounterRes/Counter : 0.0 );
    }

    // start the resulting network
    pNew = Gia_ManDup( p );
    Gia_ManHashStart( pNew );
    nNodesNew = 1000 + 3 * Gia_ManObjNum(pNew);
    pNew->pNexts = ABC_CALLOC( int, nNodesNew );
    pNew->pReprs = ABC_CALLOC( Gia_Rpr_t, nNodesNew );
    for ( i = 0; i < nNodesNew; i++ )
        Gia_ObjSetRepr( pNew, i, GIA_VOID );

    // collect nodes to be used for resynthesis
    Counter = CounterRes = 0;
    vTimeCries = Vec_IntAlloc( 16 );
    vTimeFanins = Vec_IntAlloc( 16 );
    Gia_ManForEachLut( p, iObj )
    {
        if ( Gia_ObjTimeSlack(p, iObj) >= tDelta )
            continue;
        // count the number of non-PI timing-critical nodes
        nTimeCris = 0;
        Gia_LutForEachFanin( p, iObj, iFanin, k )
            if ( !Gia_ObjIsCi(Gia_ManObj(p, iFanin)) && (puTCEdges[iObj] & (1<<k)) )
                nTimeCris++;
        if ( !fVeryVerbose && nTimeCris == 0 )
            continue;
        Counter++;
        // count the total number of timing critical second-generation nodes
        Vec_IntClear( vTimeCries );
        if ( nTimeCris )
        {
            Gia_LutForEachFanin( p, iObj, iFanin, k )
                if ( !Gia_ObjIsCi(Gia_ManObj(p, iFanin)) && (puTCEdges[iObj] & (1<<k)) )
                    Gia_LutForEachFanin( p, iFanin, iFanin2, k2 )
                        if ( puTCEdges[iFanin] & (1<<k2) )
                            Vec_IntPushUnique( vTimeCries, iFanin2 );
        }
//        if ( !fVeryVerbose && (Vec_IntSize(vTimeCries) == 0 || Vec_IntSize(vTimeCries) > Degree) )
        if ( (Vec_IntSize(vTimeCries) == 0 || Vec_IntSize(vTimeCries) > Degree) )
            continue;
        CounterRes++;
        // collect second generation nodes
        Vec_IntClear( vTimeFanins );
        Gia_LutForEachFanin( p, iObj, iFanin, k )
        {
            if ( Gia_ObjIsCi(Gia_ManObj(p, iFanin)) )
                Vec_IntPushUnique( vTimeFanins, iFanin );
            else
                Gia_LutForEachFanin( p, iFanin, iFanin2, k2 )
                    Vec_IntPushUnique( vTimeFanins, iFanin2 );                    
        }
        // print the results
        if ( fVeryVerbose )
        {
        printf( "%5d Node %5d : %d %2d %2d  ", Counter, iObj, 
            nTimeCris, Vec_IntSize(vTimeCries), Vec_IntSize(vTimeFanins) );
        Gia_LutForEachFanin( p, iObj, iFanin, k )
            printf( "%d(%.2f)%s ", iFanin, Gia_ObjTimeSlack(p, iFanin), (puTCEdges[iObj] & (1<<k))? "*":"" );
        printf( "\n" );
        }
        // add the node to choices
        if ( Vec_IntSize(vTimeCries) == 0 || Vec_IntSize(vTimeCries) > Degree )
            continue;
        // order the fanins in the increasing order of criticalily
        if ( Vec_IntSize(vTimeCries) > 1 )
        {
            iFanin = Vec_IntEntry( vTimeCries, 0 );
            iFanin2 = Vec_IntEntry( vTimeCries, 1 );
            if ( Gia_ObjTimeSlack(p, iFanin) < Gia_ObjTimeSlack(p, iFanin2) )
            {
                Vec_IntWriteEntry( vTimeCries, 0, iFanin2 );
                Vec_IntWriteEntry( vTimeCries, 1, iFanin );
            }
        }
        if ( Vec_IntSize(vTimeCries) > 2 )
        {
            iFanin = Vec_IntEntry( vTimeCries, 1 );
            iFanin2 = Vec_IntEntry( vTimeCries, 2 );
            if ( Gia_ObjTimeSlack(p, iFanin) < Gia_ObjTimeSlack(p, iFanin2) )
            {
                Vec_IntWriteEntry( vTimeCries, 1, iFanin2 );
                Vec_IntWriteEntry( vTimeCries, 2, iFanin );
            }
            iFanin = Vec_IntEntry( vTimeCries, 0 );
            iFanin2 = Vec_IntEntry( vTimeCries, 1 );
            if ( Gia_ObjTimeSlack(p, iFanin) < Gia_ObjTimeSlack(p, iFanin2) )
            {
                Vec_IntWriteEntry( vTimeCries, 0, iFanin2 );
                Vec_IntWriteEntry( vTimeCries, 1, iFanin );
            }
        }
        // add choice
        Gia_ManSpeedupObj( pNew, p, Gia_ManObj(p,iObj), vTimeFanins, vTimeCries );
        // quit if the number of nodes is large
        if ( Gia_ManObjNum(pNew) > nNodesNew - 100 )
        {
            printf( "Speedup stopped adding choices because there was too many to add.\n" );
            break;
        }
    }
    Gia_ManTimeStop( p );
    Vec_IntFree( vTimeCries );
    Vec_IntFree( vTimeFanins );
    ABC_FREE( puTCEdges );
    if ( fVerbose )
        printf( "Nodes: Total = %7d. 0-slack = %7d. Workable = %7d. Ratio = %4.2f\n", 
        Gia_ManLutNum(p), Counter, CounterRes, Counter? 1.0*CounterRes/Counter : 0.0 ); 
    if ( pTempTim )
    {
        Tim_ManStop( (Tim_Man_t *)p->pManTime );
        p->pManTime = pTempTim;
    }
    // derive AIG with choices
//Gia_ManPrintStats( pNew, 0 );
    pTemp = Gia_ManEquivToChoices( pNew, 1 );
    Gia_ManStop( pNew );
//Gia_ManPrintStats( pTemp, 0 );
//    pNew = Gia_ManDupOrderDfsChoices( pTemp );
//    Gia_ManStop( pTemp );
//Gia_ManPrintStats( pNew, 0 );
//    return pNew;
    return pTemp;
}

////////////////////////////////////////////////////////////////////////
///                       END OF FILE                                ///
////////////////////////////////////////////////////////////////////////


ABC_NAMESPACE_IMPL_END