fraigNode.c File Reference

#include "fraigInt.h"

Go to the source code of this file.

Macros
#define	Fraig_NodeIsSimComplement(p)   (Fraig_IsComplement(p)? !(Fraig_Regular(p)->fInv) : (p)->fInv)
	DECLARATIONS ///. More...

Functions
Fraig_Node_t *	Fraig_NodeCreateConst (Fraig_Man_t *p)
	FUNCTION DEFINITIONS ///. More...
Fraig_Node_t *	Fraig_NodeCreatePi (Fraig_Man_t *p)
Fraig_Node_t *	Fraig_NodeCreate (Fraig_Man_t *p, Fraig_Node_t *p1, Fraig_Node_t *p2)
void	Fraig_NodeSimulate (Fraig_Node_t *pNode, int iWordStart, int iWordStop, int fUseRand)

Macro Definition Documentation

#define Fraig_NodeIsSimComplement

(

p

)

(Fraig_IsComplement(p)? !(Fraig_Regular(p)->fInv) : (p)->fInv)

DECLARATIONS ///.

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

FileName [fraigNode.c]

PackageName [FRAIG: Functionally reduced AND-INV graphs.]

Synopsis [Implementation of the FRAIG node.]

Author [Alan Mishchenko alanm.nosp@m.i@ee.nosp@m.cs.be.nosp@m.rkel.nosp@m.ey.ed.nosp@m.u]

Affiliation [UC Berkeley]

Date [Ver. 2.0. Started - October 1, 2004]

Revision [

Id:

fraigNode.c,v 1.3 2005/07/08 01:01:32 alanmi Exp

]

Definition at line 29 of file fraigNode.c.

Function Documentation

Fraig_Node_t* Fraig_NodeCreate	(	Fraig_Man_t *	p,
		Fraig_Node_t *	p1,
		Fraig_Node_t *	p2
	)

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

Synopsis [Creates a new node.]

Description [This procedure should be called to create the constant node and the PI nodes first.]

SideEffects []

SeeAlso []

Definition at line 160 of file fraigNode.c.

{
    Fraig_Node_t * pNode;
    abctime clk;

    // create the node
    pNode = (Fraig_Node_t *)Fraig_MemFixedEntryFetch( p->mmNodes );
    memset( pNode, 0, sizeof(Fraig_Node_t) );

    // assign the children
    pNode->p1  = p1;  Fraig_Ref(p1);  Fraig_Regular(p1)->nRefs++;
    pNode->p2  = p2;  Fraig_Ref(p2);  Fraig_Regular(p2)->nRefs++;

    // assign the number and add to the array of nodes
    pNode->Num = p->vNodes->nSize;
    Fraig_NodeVecPush( p->vNodes,  pNode );

    // assign the PI number
    pNode->NumPi = -1;

    // compute the level of this node
    pNode->Level = 1 + Abc_MaxInt(Fraig_Regular(p1)->Level, Fraig_Regular(p2)->Level);
    pNode->fInv  = Fraig_NodeIsSimComplement(p1) & Fraig_NodeIsSimComplement(p2);
    pNode->fFailTfo = Fraig_Regular(p1)->fFailTfo | Fraig_Regular(p2)->fFailTfo;

    // derive the simulation info 
clk = Abc_Clock();
    // allocate memory for the simulation info
    pNode->puSimR = (unsigned *)Fraig_MemFixedEntryFetch( p->mmSims );
    pNode->puSimD = pNode->puSimR + p->nWordsRand;
    // derive random simulation info
    pNode->uHashR = 0;
    Fraig_NodeSimulate( pNode, 0, p->nWordsRand, 1 );
    // derive dynamic simulation info
    pNode->uHashD = 0;
    Fraig_NodeSimulate( pNode, 0, p->iWordStart, 0 );
    // count the number of ones in the random simulation info
    pNode->nOnes = Fraig_BitStringCountOnes( pNode->puSimR, p->nWordsRand );
    if ( pNode->fInv )
        pNode->nOnes = p->nWordsRand * 32 - pNode->nOnes;
    // add to the runtime of simulation
p->timeSims += Abc_Clock() - clk;

#ifdef FRAIG_ENABLE_FANOUTS
    // create the fanout info
    Fraig_NodeAddFaninFanout( Fraig_Regular(p1), pNode );
    Fraig_NodeAddFaninFanout( Fraig_Regular(p2), pNode );
#endif
    return pNode;
}

Fraig_Node_t* Fraig_NodeCreateConst

(

Fraig_Man_t *

p

)

FUNCTION DEFINITIONS ///.

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

Synopsis [Creates the constant 1 node.]

Description []

SideEffects []

SeeAlso []

Definition at line 46 of file fraigNode.c.

{
    Fraig_Node_t * pNode;

    // create the node
    pNode = (Fraig_Node_t *)Fraig_MemFixedEntryFetch( p->mmNodes );
    memset( pNode, 0, sizeof(Fraig_Node_t) );

    // assign the number and add to the array of nodes
    pNode->Num   = p->vNodes->nSize;
    Fraig_NodeVecPush( p->vNodes,  pNode );
    pNode->NumPi = -1;  // this is not a PI, so its number is -1
    pNode->Level =  0;  // just like a PI, it has 0 level
    pNode->nRefs =  1;  // it is a persistent node, which comes referenced
    pNode->fInv  =  1;  // the simulation info is complemented

    // create the simulation info
    pNode->puSimR = (unsigned *)Fraig_MemFixedEntryFetch( p->mmSims );
    pNode->puSimD = pNode->puSimR + p->nWordsRand;
    memset( pNode->puSimR, 0, sizeof(unsigned) * p->nWordsRand );
    memset( pNode->puSimD, 0, sizeof(unsigned) * p->nWordsDyna );

    // count the number of ones in the simulation vector
    pNode->nOnes = p->nWordsRand * sizeof(unsigned) * 8;

    // insert it into the hash table
    Fraig_HashTableLookupF0( p, pNode );
    return pNode;
}

Fraig_Node_t* Fraig_NodeCreatePi

(

Fraig_Man_t *

p

)

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

Synopsis [Creates a primary input node.]

Description []

SideEffects []

SeeAlso []

Definition at line 87 of file fraigNode.c.

{
    Fraig_Node_t * pNode, * pNodeRes;
    int i;
    abctime clk;

    // create the node
    pNode = (Fraig_Node_t *)Fraig_MemFixedEntryFetch( p->mmNodes );
    memset( pNode, 0, sizeof(Fraig_Node_t) );
    pNode->puSimR = (unsigned *)Fraig_MemFixedEntryFetch( p->mmSims );
    pNode->puSimD = pNode->puSimR + p->nWordsRand;
    memset( pNode->puSimD, 0, sizeof(unsigned) * p->nWordsDyna );

    // assign the number and add to the array of nodes
    pNode->Num   = p->vNodes->nSize;
    Fraig_NodeVecPush( p->vNodes,  pNode );

    // assign the PI number and add to the array of primary inputs
    pNode->NumPi = p->vInputs->nSize;   
    Fraig_NodeVecPush( p->vInputs, pNode );

    pNode->Level =  0;  // PI has 0 level
    pNode->nRefs =  1;  // it is a persistent node, which comes referenced
    pNode->fInv  =  0;  // the simulation info of the PI is not complemented

    // derive the simulation info for the new node
clk = Abc_Clock();
    // set the random simulation info for the primary input
    pNode->uHashR = 0;
    for ( i = 0; i < p->nWordsRand; i++ )
    {
        // generate the simulation info
        pNode->puSimR[i] = FRAIG_RANDOM_UNSIGNED;
        // for reasons that take very long to explain, it makes sense to have (0000000...) 
        // pattern in the set (this helps if we need to return the counter-examples)
        if ( i == 0 )
            pNode->puSimR[i] <<= 1;
        // compute the hash key
        pNode->uHashR ^= pNode->puSimR[i] * s_FraigPrimes[i];
    }
    // count the number of ones in the simulation vector
    pNode->nOnes = Fraig_BitStringCountOnes( pNode->puSimR, p->nWordsRand );

    // set the systematic simulation info for the primary input
    pNode->uHashD = 0;
    for ( i = 0; i < p->iWordStart; i++ )
    {
        // generate the simulation info
        pNode->puSimD[i] = FRAIG_RANDOM_UNSIGNED;
        // compute the hash key
        pNode->uHashD ^= pNode->puSimD[i] * s_FraigPrimes[i];
    }
p->timeSims += Abc_Clock() - clk;

    // insert it into the hash table
    pNodeRes = Fraig_HashTableLookupF( p, pNode );
    assert( pNodeRes == NULL );
    // add to the runtime of simulation
    return pNode;
}

void Fraig_NodeSimulate	(	Fraig_Node_t *	pNode,
		int	iWordStart,
		int	iWordStop,
		int	fUseRand
	)

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

Synopsis [Simulates the node.]

Description [Simulates the random or dynamic simulation info through the node. Uses phases of the children to determine their real simulation info. Uses phase of the node to determine the way its simulation info is stored. The resulting info is guaranteed to be 0 for the first pattern.]

SideEffects [This procedure modified the hash value of the simulation info.]

SeeAlso []

Definition at line 226 of file fraigNode.c.

{
    unsigned * pSims, * pSims1, * pSims2;
    unsigned uHash;
    int fCompl, fCompl1, fCompl2, i;

    assert( !Fraig_IsComplement(pNode) );

    // get hold of the simulation information
    pSims  = fUseRand? pNode->puSimR                    : pNode->puSimD;
    pSims1 = fUseRand? Fraig_Regular(pNode->p1)->puSimR : Fraig_Regular(pNode->p1)->puSimD;
    pSims2 = fUseRand? Fraig_Regular(pNode->p2)->puSimR : Fraig_Regular(pNode->p2)->puSimD;

    // get complemented attributes of the children using their random info
    fCompl  = pNode->fInv;
    fCompl1 = Fraig_NodeIsSimComplement(pNode->p1);
    fCompl2 = Fraig_NodeIsSimComplement(pNode->p2);

    // simulate
    uHash = 0;
    if ( fCompl1 && fCompl2 )
    {
        if ( fCompl )
            for ( i = iWordStart; i < iWordStop; i++ )
            {
                pSims[i] = (pSims1[i] | pSims2[i]);
                uHash ^= pSims[i] * s_FraigPrimes[i];
            }
        else
            for ( i = iWordStart; i < iWordStop; i++ )
            {
                pSims[i] = ~(pSims1[i] | pSims2[i]);
                uHash ^= pSims[i] * s_FraigPrimes[i];
            }
    }
    else if ( fCompl1 && !fCompl2 )
    {
        if ( fCompl )
            for ( i = iWordStart; i < iWordStop; i++ )
            {
                pSims[i] = (pSims1[i] | ~pSims2[i]);
                uHash ^= pSims[i] * s_FraigPrimes[i];
            }
        else
            for ( i = iWordStart; i < iWordStop; i++ )
            {
                pSims[i] = (~pSims1[i] & pSims2[i]);
                uHash ^= pSims[i] * s_FraigPrimes[i];
            }
    }
    else if ( !fCompl1 && fCompl2 )
    {
        if ( fCompl )
            for ( i = iWordStart; i < iWordStop; i++ )
            {
                pSims[i] = (~pSims1[i] | pSims2[i]);
                uHash ^= pSims[i] * s_FraigPrimes[i];
            }
        else
            for ( i = iWordStart; i < iWordStop; i++ )
            {
                pSims[i] = (pSims1[i] & ~pSims2[i]);
                uHash ^= pSims[i] * s_FraigPrimes[i];
            }
    }
    else // if ( !fCompl1 && !fCompl2 )
    {
        if ( fCompl )
            for ( i = iWordStart; i < iWordStop; i++ )
            {
                pSims[i] = ~(pSims1[i] & pSims2[i]);
                uHash ^= pSims[i] * s_FraigPrimes[i];
            }
        else
            for ( i = iWordStart; i < iWordStop; i++ )
            {
                pSims[i] = (pSims1[i] & pSims2[i]);
                uHash ^= pSims[i] * s_FraigPrimes[i];
            }
    }

    if ( fUseRand )
        pNode->uHashR ^= uHash;
    else
        pNode->uHashD ^= uHash;
}