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/**CFile****************************************************************
FileName [cutTable.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [K-feasible cut computation package.]
Synopsis [Hashing cuts to prevent duplication.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: cutTable.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "cutInt.h"
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
struct Cut_HashTableStruct_t_
{
int nBins;
Cut_Cut_t ** pBins;
int nEntries;
int * pPlaces;
int nPlaces;
int timeLookup;
};
// iterator through all the cuts of the list
#define Cut_TableListForEachCut( pList, pCut ) \
for ( pCut = pList; \
pCut; \
pCut = pCut->pData )
#define Cut_TableListForEachCutSafe( pList, pCut, pCut2 ) \
for ( pCut = pList, \
pCut2 = pCut? pCut->pData: NULL; \
pCut; \
pCut = pCut2, \
pCut2 = pCut? pCut->pData: NULL )
// primes used to compute the hash key
static int s_HashPrimes[10] = { 109, 499, 557, 619, 631, 709, 797, 881, 907, 991 };
// hashing function
static inline unsigned Cut_HashKey( Cut_Cut_t * pCut )
{
unsigned i, uRes = pCut->nLeaves * s_HashPrimes[9];
for ( i = 0; i < pCut->nLeaves + pCut->fSeq; i++ )
uRes += s_HashPrimes[i] * pCut->pLeaves[i];
return uRes;
}
// hashing function
static inline int Cut_CompareTwo( Cut_Cut_t * pCut1, Cut_Cut_t * pCut2 )
{
unsigned i;
if ( pCut1->nLeaves != pCut2->nLeaves )
return 1;
for ( i = 0; i < pCut1->nLeaves; i++ )
if ( pCut1->pLeaves[i] != pCut2->pLeaves[i] )
return 1;
return 0;
}
static void Cut_TableResize( Cut_HashTable_t * pTable );
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Starts the hash table.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Cut_HashTable_t * Cut_TableStart( int Size )
{
Cut_HashTable_t * pTable;
pTable = ALLOC( Cut_HashTable_t, 1 );
memset( pTable, 0, sizeof(Cut_HashTable_t) );
// allocate the table
pTable->nBins = Cudd_PrimeCopy( Size );
pTable->pBins = ALLOC( Cut_Cut_t *, pTable->nBins );
memset( pTable->pBins, 0, sizeof(Cut_Cut_t *) * pTable->nBins );
pTable->pPlaces = ALLOC( int, pTable->nBins );
return pTable;
}
/**Function*************************************************************
Synopsis [Stops the hash table.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Cut_TableStop( Cut_HashTable_t * pTable )
{
FREE( pTable->pPlaces );
free( pTable->pBins );
free( pTable );
}
/**Function*************************************************************
Synopsis [Check the existence of a cut in the lookup table]
Description [Returns 1 if the entry is found.]
SideEffects []
SeeAlso []
***********************************************************************/
int Cut_TableLookup( Cut_HashTable_t * pTable, Cut_Cut_t * pCut, int fStore )
{
Cut_Cut_t * pEnt;
unsigned Key;
int clk = clock();
Key = Cut_HashKey(pCut) % pTable->nBins;
Cut_TableListForEachCut( pTable->pBins[Key], pEnt )
{
if ( !Cut_CompareTwo( pEnt, pCut ) )
{
pTable->timeLookup += clock() - clk;
return 1;
}
}
if ( pTable->nEntries > 2 * pTable->nBins )
{
Cut_TableResize( pTable );
Key = Cut_HashKey(pCut) % pTable->nBins;
}
// remember the place
if ( fStore && pTable->pBins[Key] == NULL )
pTable->pPlaces[ pTable->nPlaces++ ] = Key;
// add the cut to the table
pCut->pData = pTable->pBins[Key];
pTable->pBins[Key] = pCut;
pTable->nEntries++;
pTable->timeLookup += clock() - clk;
return 0;
}
/**Function*************************************************************
Synopsis [Stops the hash table.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Cut_TableClear( Cut_HashTable_t * pTable )
{
int i;
assert( pTable->nPlaces <= pTable->nBins );
for ( i = 0; i < pTable->nPlaces; i++ )
{
assert( pTable->pBins[ pTable->pPlaces[i] ] );
pTable->pBins[ pTable->pPlaces[i] ] = NULL;
}
pTable->nPlaces = 0;
pTable->nEntries = 0;
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Cut_TableResize( Cut_HashTable_t * pTable )
{
Cut_Cut_t ** pBinsNew;
Cut_Cut_t * pEnt, * pEnt2;
int nBinsNew, Counter, i, clk;
unsigned Key;
clk = clock();
// get the new table size
nBinsNew = Cudd_PrimeCopy( 3 * pTable->nBins );
// allocate a new array
pBinsNew = ALLOC( Cut_Cut_t *, nBinsNew );
memset( pBinsNew, 0, sizeof(Cut_Cut_t *) * nBinsNew );
// rehash the entries from the old table
Counter = 0;
for ( i = 0; i < pTable->nBins; i++ )
Cut_TableListForEachCutSafe( pTable->pBins[i], pEnt, pEnt2 )
{
Key = Cut_HashKey(pEnt) % nBinsNew;
pEnt->pData = pBinsNew[Key];
pBinsNew[Key] = pEnt;
Counter++;
}
assert( Counter == pTable->nEntries );
// printf( "Increasing the structural table size from %6d to %6d. ", pMan->nBins, nBinsNew );
// PRT( "Time", clock() - clk );
// replace the table and the parameters
free( pTable->pBins );
pTable->pBins = pBinsNew;
pTable->nBins = nBinsNew;
}
/**Function*************************************************************
Synopsis [Stops the hash table.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Cut_TableReadTime( Cut_HashTable_t * pTable )
{
if ( pTable == NULL )
return 0;
return pTable->timeLookup;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
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