reoProfile.c File Reference

#include "reo.h"

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Functions
ABC_NAMESPACE_IMPL_START void	reoProfileNodesStart (reo_man *p)
	DECLARATIONS ///.
void	reoProfileAplStart (reo_man *p)
void	reoProfileWidthStart (reo_man *p)
void	reoProfileWidthStart2 (reo_man *p)
void	reoProfileNodesPrint (reo_man *p)
void	reoProfileAplPrint (reo_man *p)
void	reoProfileWidthPrint (reo_man *p)
void	reoProfileWidthVerifyLevel (reo_plane *pPlane, int Level)

Function Documentation

reoProfileAplPrint()

void reoProfileAplPrint

(

reo_man *

p

)

Function********************************************************************

Synopsis []

Description []

SideEffects []

SeeAlso []

Definition at line 305 of file reoProfile.c.

{
    printf( "APL: Total = %8.2f. Average =%6.2f.\n", p->nAplCur, p->nAplCur / (float)p->nSupp );
}

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reoProfileAplStart()

void reoProfileAplStart

(

reo_man *

p

)

Function*************************************************************

Synopsis [Start the profile for the APL.]

Description [Computes the total path length. The path length is normalized by dividing it by 2^|supp(f)|. To get the "real" APL, multiply by 2^|supp(f)|. This procedure assumes that Weight field of all nodes has been set to 0.0 before the call, except for the weight of the topmost node, which is set to 1.0 (1.0 is the probability of traversing the topmost node). This procedure assigns the edge weights. Because of the equal probability of selecting 0 and 1 assignment at a node, the edge weights are the same for the node. Instead of storing them, we store the weight of the node, which is the probability of traversing the node (pUnit->Weight) during the top down evalation of the BDD. ]

SideEffects []

SeeAlso []

Definition at line 78 of file reoProfile.c.

{
    reo_unit * pER, * pTR;
    reo_unit * pUnit;
    double Res, Half;
    int i;
 
    // clean the weights of all nodes
    for ( i = 0; i < p->nSupp; i++ )
        for ( pUnit = p->pPlanes[i].pHead; pUnit; pUnit = pUnit->Next )
            pUnit->Weight = 0.0;
    // to assign the node weights (the probability of visiting each node)
    // we visit the node after visiting its predecessors
 
    // set the probability of visits to the top nodes
    for ( i = 0; i < p->nTops; i++ )
        Unit_Regular(p->pTops[i])->Weight += 1.0;
 
    // to compute the path length (the sum of products of edge weight by edge length)
    // we visit the nodes in any order (the above order will do)
    Res = 0.0;
    for ( i = 0; i < p->nSupp; i++ )
    {
        p->pPlanes[i].statsCost = 0.0;
        for ( pUnit = p->pPlanes[i].pHead; pUnit; pUnit = pUnit->Next )
        {
            pER  = Unit_Regular(pUnit->pE);
            pTR  = Unit_Regular(pUnit->pT);
            Half = 0.5 * pUnit->Weight;
            pER->Weight += Half;
            pTR->Weight += Half;
            // add to the path length
            p->pPlanes[i].statsCost += pUnit->Weight;
        }
        Res += p->pPlanes[i].statsCost;
    }
    p->pPlanes[p->nSupp].statsCost = 0.0;
    p->nAplBeg = p->nAplCur = Res;
}

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reoProfileNodesPrint()

void reoProfileNodesPrint

(

reo_man *

p

)

Function********************************************************************

Synopsis []

Description []

SideEffects []

SeeAlso []

Definition at line 289 of file reoProfile.c.

{
    printf( "NODES: Total = %6d. Average = %6.2f.\n", p->nNodesCur, p->nNodesCur / (float)p->nSupp );
}

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reoProfileNodesStart()

ABC_NAMESPACE_IMPL_START void reoProfileNodesStart

(

reo_man *

p

)

DECLARATIONS ///.

CFile****************************************************************

FileName [reoProfile.c]

PackageName [REO: A specialized DD reordering engine.]

Synopsis [Procudures that compute variables profiles (nodes, width, APL).]

Author [Alan Mishchenko]

Affiliation [UC Berkeley]

Date [Ver. 1.0. Started - October 15, 2002.]

Revision [

Id

reoProfile.c,v 1.0 2002/15/10 03:00:00 alanmi Exp

] FUNCTION DEFINITIONS /// Function********************************************************************

Synopsis [Start the profile for the BDD nodes.]

Description [TopRef is the first level, on this the given node counts towards the width of the BDDs. (In other words, it is the level of the referencing node plus 1.)]

SideEffects []

SeeAlso []

Definition at line 46 of file reoProfile.c.

{
    int Total, i;
    Total = 0;
    for ( i = 0; i <= p->nSupp; i++ )
    {
        p->pPlanes[i].statsCost = p->pPlanes[i].statsNodes;
        Total += p->pPlanes[i].statsNodes;
    }
    assert( Total == p->nNodesCur );
    p->nNodesBeg = p->nNodesCur;
}

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reoProfileWidthPrint()

void reoProfileWidthPrint

(

reo_man *

p

)

Function********************************************************************

Synopsis []

Description []

SideEffects []

SeeAlso []

Definition at line 321 of file reoProfile.c.

{
    int WidthMax;
    int TotalWidth;
    int i;
 
    WidthMax   = 0;
    TotalWidth = 0;
    for ( i = 0; i <= p->nSupp; i++ )
    {
        printf( "Level = %2d. Width = %3d.\n", i, p->pPlanes[i].statsWidth );
        if ( WidthMax < p->pPlanes[i].statsWidth )
             WidthMax = p->pPlanes[i].statsWidth;
        TotalWidth += p->pPlanes[i].statsWidth;
    }
    assert( p->nWidthCur == TotalWidth );
    printf( "WIDTH: " );
    printf( "Maximum = %5d.  ", WidthMax );
    printf( "Total = %7d.  ", p->nWidthCur );
    printf( "Average = %6.2f.\n", TotalWidth / (float)p->nSupp );
}

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reoProfileWidthStart()

void reoProfileWidthStart

(

reo_man *

p

)

Function********************************************************************

Synopsis [Start the profile for the BDD width. Complexity of the algorithm is O(N + n).]

Description [TopRef is the first level, on which the given node counts towards the width of the BDDs. (In other words, it is the level of the referencing node plus 1.)]

SideEffects []

SeeAlso []

Definition at line 130 of file reoProfile.c.

{
    reo_unit * pUnit;
    int * pWidthStart;
    int * pWidthStop;
    int v;
 
    // allocate and clean the storage for starting and stopping levels
    pWidthStart = ABC_ALLOC( int, p->nSupp + 1 );
    pWidthStop  = ABC_ALLOC( int, p->nSupp + 1 );
    memset( pWidthStart, 0, sizeof(int) * (p->nSupp + 1) );
    memset( pWidthStop, 0, sizeof(int) * (p->nSupp + 1) );
 
    // go through the non-constant nodes and set the topmost level of their cofactors
    for ( v = 0; v <= p->nSupp; v++ )
    for ( pUnit = p->pPlanes[v].pHead; pUnit; pUnit = pUnit->Next )
    {
        pUnit->TopRef = REO_TOPREF_UNDEF;
        pUnit->Sign   = 0;
    }
 
    // add the topmost level of the width profile
    for ( v = 0; v < p->nTops; v++ )
    {
        pUnit = Unit_Regular(p->pTops[v]);
        if ( pUnit->TopRef == REO_TOPREF_UNDEF )
        {
            // set the starting level
            pUnit->TopRef = 0;
            pWidthStart[pUnit->TopRef]++;
            // set the stopping level
            if ( pUnit->lev != REO_CONST_LEVEL )
                pWidthStop[pUnit->lev+1]++;
        }
    }
 
    for ( v = 0; v < p->nSupp; v++ )
    for ( pUnit = p->pPlanes[v].pHead; pUnit; pUnit = pUnit->Next )
    {
        if ( pUnit->pE->TopRef == REO_TOPREF_UNDEF )
        {
            // set the starting level
            pUnit->pE->TopRef = pUnit->lev + 1;
            pWidthStart[pUnit->pE->TopRef]++;
            // set the stopping level
            if ( pUnit->pE->lev != REO_CONST_LEVEL )
                pWidthStop[pUnit->pE->lev+1]++;
        }
        if ( pUnit->pT->TopRef == REO_TOPREF_UNDEF )
        {
            // set the starting level
            pUnit->pT->TopRef = pUnit->lev + 1;
            pWidthStart[pUnit->pT->TopRef]++;
            // set the stopping level
            if ( pUnit->pT->lev != REO_CONST_LEVEL )
                pWidthStop[pUnit->pT->lev+1]++;
        }
    }
 
    // verify the top reference
    for ( v = 0; v < p->nSupp; v++ )
        reoProfileWidthVerifyLevel( p->pPlanes + v, v );
 
    // derive the profile
    p->nWidthCur = 0;
    for ( v = 0; v <= p->nSupp; v++ )
    {
        if ( v == 0 )
            p->pPlanes[v].statsWidth = pWidthStart[v] - pWidthStop[v];
        else
            p->pPlanes[v].statsWidth = p->pPlanes[v-1].statsWidth + pWidthStart[v] - pWidthStop[v];
        p->pPlanes[v].statsCost = p->pPlanes[v].statsWidth;
        p->nWidthCur += p->pPlanes[v].statsWidth;
        printf( "Level %2d: Width = %5d.\n", v, p->pPlanes[v].statsWidth );
    }
    p->nWidthBeg = p->nWidthCur;
    ABC_FREE( pWidthStart );
    ABC_FREE( pWidthStop );
}

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reoProfileWidthStart2()

void reoProfileWidthStart2

(

reo_man *

p

)

Function********************************************************************

Synopsis [Start the profile for the BDD width. Complexity of the algorithm is O(N * n).]

Description [TopRef is the first level, on which the given node counts towards the width of the BDDs. (In other words, it is the level of the referencing node plus 1.)]

SideEffects []

SeeAlso []

Definition at line 222 of file reoProfile.c.

{
    reo_unit * pUnit;
    int i, v;
 
    // clean the profile
    for ( i = 0; i <= p->nSupp; i++ )
        p->pPlanes[i].statsWidth = 0;
    
    // clean the node structures
    for ( v = 0; v <= p->nSupp; v++ )
    for ( pUnit = p->pPlanes[v].pHead; pUnit; pUnit = pUnit->Next )
    {
        pUnit->TopRef = REO_TOPREF_UNDEF;
        pUnit->Sign   = 0;
    }
 
    // set the topref to the topmost nodes
    for ( i = 0; i < p->nTops; i++ )
        Unit_Regular(p->pTops[i])->TopRef = 0;
 
    // go through the non-constant nodes and set the topmost level of their cofactors
    for ( i = 0; i < p->nSupp; i++ )
        for ( pUnit = p->pPlanes[i].pHead; pUnit; pUnit = pUnit->Next )
        {
            if ( pUnit->pE->TopRef > i+1 )
                 pUnit->pE->TopRef = i+1;
            if ( pUnit->pT->TopRef > i+1 )
                 pUnit->pT->TopRef = i+1;
        }
 
    // verify the top reference
    for ( i = 0; i < p->nSupp; i++ )
        reoProfileWidthVerifyLevel( p->pPlanes + i, i );
 
    // compute the profile for the internal nodes
    for ( i = 0; i < p->nSupp; i++ )
        for ( pUnit = p->pPlanes[i].pHead; pUnit; pUnit = pUnit->Next )
            for ( v = pUnit->TopRef; v <= pUnit->lev; v++ )
                p->pPlanes[v].statsWidth++;
 
    // compute the profile for the constant nodes
    for ( pUnit = p->pPlanes[p->nSupp].pHead; pUnit; pUnit = pUnit->Next )
        for ( v = pUnit->TopRef; v <= p->nSupp; v++ )
            p->pPlanes[v].statsWidth++;
 
    // get the width cost
    p->nWidthCur = 0;
    for ( i = 0; i <= p->nSupp; i++ )
    {
        p->pPlanes[i].statsCost = p->pPlanes[i].statsWidth;
        p->nWidthCur           += p->pPlanes[i].statsWidth;
    }
    p->nWidthBeg = p->nWidthCur;
}

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reoProfileWidthVerifyLevel()

void reoProfileWidthVerifyLevel	(	reo_plane *	pPlane,
		int	Level )

Function********************************************************************

Synopsis []

Description []

SideEffects []

SeeAlso []

Definition at line 354 of file reoProfile.c.

{
    reo_unit * pUnit;
    for ( pUnit = pPlane->pHead; pUnit; pUnit = pUnit->Next )
    {
        assert( pUnit->TopRef     <= Level );
        assert( pUnit->pE->TopRef <= Level + 1 );
        assert( pUnit->pT->TopRef <= Level + 1 );
    }
}

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