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/**CFile****************************************************************
FileName [aigTable.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [AIG package.]
Synopsis [Structural hashing table.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - April 28, 2007.]
Revision [$Id: aigTable.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
***********************************************************************/
#include "aig.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
// hashing the node
static unsigned long Aig_Hash( Aig_Obj_t * pObj, int TableSize )
{
unsigned long Key = Aig_ObjIsExor(pObj) * 1699;
Key ^= Aig_ObjFanin0(pObj)->Id * 7937;
Key ^= Aig_ObjFanin1(pObj)->Id * 2971;
Key ^= Aig_ObjFaninC0(pObj) * 911;
Key ^= Aig_ObjFaninC1(pObj) * 353;
return Key % TableSize;
}
// returns the place where this node is stored (or should be stored)
static Aig_Obj_t ** Aig_TableFind( Aig_Man_t * p, Aig_Obj_t * pObj )
{
Aig_Obj_t ** ppEntry;
assert( Aig_ObjChild0(pObj) && Aig_ObjChild1(pObj) );
assert( Aig_ObjFanin0(pObj)->Id < Aig_ObjFanin1(pObj)->Id );
for ( ppEntry = p->pTable + Aig_Hash(pObj, p->nTableSize); *ppEntry; ppEntry = &(*ppEntry)->pNext )
if ( *ppEntry == pObj )
return ppEntry;
assert( *ppEntry == NULL );
return ppEntry;
}
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Resizes the table.]
Description [Typically this procedure should not be called.]
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_TableResize( Aig_Man_t * p )
{
Aig_Obj_t * pEntry, * pNext;
Aig_Obj_t ** pTableOld, ** ppPlace;
int nTableSizeOld, Counter, i;
abctime clk;
assert( p->pTable != NULL );
clk = Abc_Clock();
// save the old table
pTableOld = p->pTable;
nTableSizeOld = p->nTableSize;
// get the new table
p->nTableSize = Abc_PrimeCudd( 2 * Aig_ManNodeNum(p) );
p->pTable = ABC_ALLOC( Aig_Obj_t *, p->nTableSize );
memset( p->pTable, 0, sizeof(Aig_Obj_t *) * p->nTableSize );
// rehash the entries from the old table
Counter = 0;
for ( i = 0; i < nTableSizeOld; i++ )
for ( pEntry = pTableOld[i], pNext = pEntry? pEntry->pNext : NULL;
pEntry; pEntry = pNext, pNext = pEntry? pEntry->pNext : NULL )
{
// get the place where this entry goes in the table
ppPlace = Aig_TableFind( p, pEntry );
assert( *ppPlace == NULL ); // should not be there
// add the entry to the list
*ppPlace = pEntry;
pEntry->pNext = NULL;
Counter++;
}
assert( Counter == Aig_ManNodeNum(p) );
// printf( "Increasing the structural table size from %6d to %6d. ", nTableSizeOld, p->nTableSize );
// ABC_PRT( "Time", Abc_Clock() - clk );
// replace the table and the parameters
ABC_FREE( pTableOld );
}
/**Function*************************************************************
Synopsis [Checks if node with the given attributes is in the hash table.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Aig_Obj_t * Aig_TableLookup( Aig_Man_t * p, Aig_Obj_t * pGhost )
{
Aig_Obj_t * pEntry;
assert( !Aig_IsComplement(pGhost) );
assert( Aig_ObjIsNode(pGhost) );
assert( Aig_ObjChild0(pGhost) && Aig_ObjChild1(pGhost) );
assert( Aig_ObjFanin0(pGhost)->Id < Aig_ObjFanin1(pGhost)->Id );
if ( p->pTable == NULL || !Aig_ObjRefs(Aig_ObjFanin0(pGhost)) || !Aig_ObjRefs(Aig_ObjFanin1(pGhost)) )
return NULL;
for ( pEntry = p->pTable[Aig_Hash(pGhost, p->nTableSize)]; pEntry; pEntry = pEntry->pNext )
{
if ( Aig_ObjChild0(pEntry) == Aig_ObjChild0(pGhost) &&
Aig_ObjChild1(pEntry) == Aig_ObjChild1(pGhost) &&
Aig_ObjType(pEntry) == Aig_ObjType(pGhost) )
return pEntry;
}
return NULL;
}
/**Function*************************************************************
Synopsis [Checks if node with the given attributes is in the hash table.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Aig_Obj_t * Aig_TableLookupTwo( Aig_Man_t * p, Aig_Obj_t * pFanin0, Aig_Obj_t * pFanin1 )
{
Aig_Obj_t * pGhost;
// consider simple cases
if ( pFanin0 == pFanin1 )
return pFanin0;
if ( pFanin0 == Aig_Not(pFanin1) )
return Aig_ManConst0(p);
if ( Aig_Regular(pFanin0) == Aig_ManConst1(p) )
return pFanin0 == Aig_ManConst1(p) ? pFanin1 : Aig_ManConst0(p);
if ( Aig_Regular(pFanin1) == Aig_ManConst1(p) )
return pFanin1 == Aig_ManConst1(p) ? pFanin0 : Aig_ManConst0(p);
pGhost = Aig_ObjCreateGhost( p, pFanin0, pFanin1, AIG_OBJ_AND );
return Aig_TableLookup( p, pGhost );
}
/**Function*************************************************************
Synopsis [Adds the new node to the hash table.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_TableInsert( Aig_Man_t * p, Aig_Obj_t * pObj )
{
Aig_Obj_t ** ppPlace;
assert( !Aig_IsComplement(pObj) );
assert( Aig_TableLookup(p, pObj) == NULL );
if ( (pObj->Id & 0xFF) == 0 && 2 * p->nTableSize < Aig_ManNodeNum(p) )
Aig_TableResize( p );
ppPlace = Aig_TableFind( p, pObj );
assert( *ppPlace == NULL );
*ppPlace = pObj;
}
/**Function*************************************************************
Synopsis [Deletes the node from the hash table.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_TableDelete( Aig_Man_t * p, Aig_Obj_t * pObj )
{
Aig_Obj_t ** ppPlace;
assert( !Aig_IsComplement(pObj) );
ppPlace = Aig_TableFind( p, pObj );
assert( *ppPlace == pObj ); // node should be in the table
// remove the node
*ppPlace = pObj->pNext;
pObj->pNext = NULL;
}
/**Function*************************************************************
Synopsis [Count the number of nodes in the table.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Aig_TableCountEntries( Aig_Man_t * p )
{
Aig_Obj_t * pEntry;
int i, Counter = 0;
for ( i = 0; i < p->nTableSize; i++ )
for ( pEntry = p->pTable[i]; pEntry; pEntry = pEntry->pNext )
Counter++;
return Counter;
}
/**Function********************************************************************
Synopsis [Profiles the hash table.]
Description []
SideEffects []
SeeAlso []
******************************************************************************/
void Aig_TableProfile( Aig_Man_t * p )
{
Aig_Obj_t * pEntry;
int i, Counter;
printf( "Table size = %d. Entries = %d.\n", p->nTableSize, Aig_ManNodeNum(p) );
for ( i = 0; i < p->nTableSize; i++ )
{
Counter = 0;
for ( pEntry = p->pTable[i]; pEntry; pEntry = pEntry->pNext )
Counter++;
if ( Counter )
printf( "%d ", Counter );
}
}
/**Function********************************************************************
Synopsis [Profiles the hash table.]
Description []
SideEffects []
SeeAlso []
******************************************************************************/
void Aig_TableClear( Aig_Man_t * p )
{
ABC_FREE( p->pTable );
p->nTableSize = 0;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
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