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/**CFile****************************************************************
FileName [aigFraig.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [And-Inverter Graph package.]
Synopsis []
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: aigFraig.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "aig.h"
#include "stmm.h"
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
static unsigned Aig_ManHashKey( unsigned * pData, int nWords );
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Creates the equivalence classes of patterns.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Vec_t * Aig_ManDeriveClassesFirst( Aig_Man_t * p, Aig_SimInfo_t * pInfo )
{
Vec_Vec_t * vClasses; // equivalence classes
stmm_table * tSim2Node; // temporary hash table hashing key into the class number
Aig_Node_t * pNode;
unsigned uKey;
int i, * pSpot, ClassNum;
assert( pInfo->Type == 1 );
// fill in the hash table
tSim2Node = stmm_init_table( stmm_numcmp, stmm_numhash );
vClasses = Vec_VecAlloc( 100 );
Aig_ManForEachNode( p, pNode, i )
{
if ( Aig_NodeIsPo(pNode) )
continue;
uKey = Aig_ManHashKey( Aig_SimInfoForNode(pInfo, pNode), pInfo->nWords );
if ( !stmm_find_or_add( tSim2Node, (char *)uKey, (char ***)&pSpot ) ) // does not exist
*pSpot = (pNode->Id << 1) | 1; // save the node, and do nothing
else if ( (*pSpot) & 1 ) // this is a node
{
// create the class
ClassNum = Vec_VecSize( vClasses );
Vec_VecPush( vClasses, ClassNum, (void *)((*pSpot) >> 1) );
Vec_VecPush( vClasses, ClassNum, (void *)pNode->Id );
// save the class
*pSpot = (ClassNum << 1);
}
else // this is a class
{
ClassNum = (*pSpot) >> 1;
Vec_VecPush( vClasses, ClassNum, (void *)pNode->Id );
}
}
stmm_free_table( tSim2Node );
return vClasses;
}
/**Function*************************************************************
Synopsis [Computes the hash key of the simulation info.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
unsigned Aig_ManHashKey( unsigned * pData, int nWords )
{
static int Primes[10] = { 1009, 2207, 3779, 4001, 4877, 5381, 6427, 6829, 7213, 7919 };
unsigned uKey;
int i;
uKey = 0;
for ( i = 0; i < nWords; i++ )
uKey ^= pData[i] * Primes[i%10];
return uKey;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
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