From 4812c90424dfc40d26725244723887a2d16ddfd9 Mon Sep 17 00:00:00 2001 From: Alan Mishchenko Date: Mon, 1 Oct 2007 08:01:00 -0700 Subject: Version abc71001 --- src/aig/ivy/ivyTable.c | 301 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 301 insertions(+) create mode 100644 src/aig/ivy/ivyTable.c (limited to 'src/aig/ivy/ivyTable.c') diff --git a/src/aig/ivy/ivyTable.c b/src/aig/ivy/ivyTable.c new file mode 100644 index 00000000..2ac0ae49 --- /dev/null +++ b/src/aig/ivy/ivyTable.c @@ -0,0 +1,301 @@ +/**CFile**************************************************************** + + FileName [ivyTable.c] + + SystemName [ABC: Logic synthesis and verification system.] + + PackageName [And-Inverter Graph package.] + + Synopsis [Structural hashing table.] + + Author [Alan Mishchenko] + + Affiliation [UC Berkeley] + + Date [Ver. 1.0. Started - May 11, 2006. ] + + Revision [$Id: ivyTable.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $] + +***********************************************************************/ + +#include "ivy.h" + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +// hashing the node +static unsigned Ivy_Hash( Ivy_Obj_t * pObj, int TableSize ) +{ + unsigned Key = Ivy_ObjIsExor(pObj) * 1699; + Key ^= Ivy_ObjFaninId0(pObj) * 7937; + Key ^= Ivy_ObjFaninId1(pObj) * 2971; + Key ^= Ivy_ObjFaninC0(pObj) * 911; + Key ^= Ivy_ObjFaninC1(pObj) * 353; + Key ^= Ivy_ObjInit(pObj) * 911; + return Key % TableSize; +} + +// returns the place where this node is stored (or should be stored) +static int * Ivy_TableFind( Ivy_Man_t * p, Ivy_Obj_t * pObj ) +{ + int i; + assert( Ivy_ObjIsHash(pObj) ); + for ( i = Ivy_Hash(pObj, p->nTableSize); p->pTable[i]; i = (i+1) % p->nTableSize ) + if ( p->pTable[i] == pObj->Id ) + break; + return p->pTable + i; +} + +static void Ivy_TableResize( Ivy_Man_t * p ); +static unsigned int Cudd_PrimeAig( unsigned int p ); + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Checks if node with the given attributes is in the hash table.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Ivy_Obj_t * Ivy_TableLookup( Ivy_Man_t * p, Ivy_Obj_t * pObj ) +{ + Ivy_Obj_t * pEntry; + int i; + assert( !Ivy_IsComplement(pObj) ); + if ( !Ivy_ObjIsHash(pObj) ) + return NULL; + assert( Ivy_ObjIsLatch(pObj) || Ivy_ObjFaninId0(pObj) > 0 ); + assert( Ivy_ObjFaninId1(pObj) == 0 || Ivy_ObjFaninId0(pObj) < Ivy_ObjFaninId1(pObj) ); + if ( Ivy_ObjFanin0(pObj)->nRefs == 0 || (Ivy_ObjChild1(pObj) && Ivy_ObjFanin1(pObj)->nRefs == 0) ) + return NULL; + for ( i = Ivy_Hash(pObj, p->nTableSize); p->pTable[i]; i = (i+1) % p->nTableSize ) + { + pEntry = Ivy_ManObj( p, p->pTable[i] ); + if ( Ivy_ObjChild0(pEntry) == Ivy_ObjChild0(pObj) && + Ivy_ObjChild1(pEntry) == Ivy_ObjChild1(pObj) && + Ivy_ObjInit(pEntry) == Ivy_ObjInit(pObj) && + Ivy_ObjType(pEntry) == Ivy_ObjType(pObj) ) + return pEntry; + } + return NULL; +} + +/**Function************************************************************* + + Synopsis [Adds the node to the hash table.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Ivy_TableInsert( Ivy_Man_t * p, Ivy_Obj_t * pObj ) +{ + int * pPlace; + assert( !Ivy_IsComplement(pObj) ); + if ( !Ivy_ObjIsHash(pObj) ) + return; + if ( (pObj->Id & 63) == 0 ) + { + if ( p->nTableSize < 2 * Ivy_ManHashObjNum(p) ) + Ivy_TableResize( p ); + } + pPlace = Ivy_TableFind( p, pObj ); + assert( *pPlace == 0 ); + *pPlace = pObj->Id; +} + +/**Function************************************************************* + + Synopsis [Deletes the node from the hash table.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Ivy_TableDelete( Ivy_Man_t * p, Ivy_Obj_t * pObj ) +{ + Ivy_Obj_t * pEntry; + int i, * pPlace; + assert( !Ivy_IsComplement(pObj) ); + if ( !Ivy_ObjIsHash(pObj) ) + return; + pPlace = Ivy_TableFind( p, pObj ); + assert( *pPlace == pObj->Id ); // node should be in the table + *pPlace = 0; + // rehash the adjacent entries + i = pPlace - p->pTable; + for ( i = (i+1) % p->nTableSize; p->pTable[i]; i = (i+1) % p->nTableSize ) + { + pEntry = Ivy_ManObj( p, p->pTable[i] ); + p->pTable[i] = 0; + Ivy_TableInsert( p, pEntry ); + } +} + +/**Function************************************************************* + + Synopsis [Updates the table to point to the new node.] + + Description [If the old node (pObj) is in the table, updates the table + to point to an object with different ID (ObjIdNew). The table should + not contain an object with ObjIdNew (this is currently not checked).] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Ivy_TableUpdate( Ivy_Man_t * p, Ivy_Obj_t * pObj, int ObjIdNew ) +{ + int * pPlace; + assert( !Ivy_IsComplement(pObj) ); + if ( !Ivy_ObjIsHash(pObj) ) + return; + pPlace = Ivy_TableFind( p, pObj ); + assert( *pPlace == pObj->Id ); // node should be in the table + *pPlace = ObjIdNew; +} + +/**Function************************************************************* + + Synopsis [Count the number of nodes in the table.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Ivy_TableCountEntries( Ivy_Man_t * p ) +{ + int i, Counter = 0; + for ( i = 0; i < p->nTableSize; i++ ) + Counter += (p->pTable[i] != 0); + return Counter; +} + +/**Function************************************************************* + + Synopsis [Resizes the table.] + + Description [Typically this procedure should not be called.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Ivy_TableResize( Ivy_Man_t * p ) +{ + int * pTableOld, * pPlace; + int nTableSizeOld, Counter, nEntries, e, clk; +clk = clock(); + // save the old table + pTableOld = p->pTable; + nTableSizeOld = p->nTableSize; + // get the new table + p->nTableSize = Cudd_PrimeAig( 5 * Ivy_ManHashObjNum(p) ); + p->pTable = ALLOC( int, p->nTableSize ); + memset( p->pTable, 0, sizeof(int) * p->nTableSize ); + // rehash the entries from the old table + Counter = 0; + for ( e = 0; e < nTableSizeOld; e++ ) + { + if ( pTableOld[e] == 0 ) + continue; + Counter++; + // get the place where this entry goes in the table table + pPlace = Ivy_TableFind( p, Ivy_ManObj(p, pTableOld[e]) ); + assert( *pPlace == 0 ); // should not be in the table + *pPlace = pTableOld[e]; + } + nEntries = Ivy_ManHashObjNum(p); +// assert( Counter == nEntries ); +// printf( "Increasing the structural table size from %6d to %6d. ", nTableSizeOld, p->nTableSize ); +// PRT( "Time", clock() - clk ); + // replace the table and the parameters + free( pTableOld ); +} + +/**Function******************************************************************** + + Synopsis [Profiles the hash table.] + + Description [] + + SideEffects [] + + SeeAlso [] + +******************************************************************************/ +void Ivy_TableProfile( Ivy_Man_t * p ) +{ + int i, Counter = 0; + for ( i = 0; i < p->nTableSize; i++ ) + { + if ( p->pTable[i] ) + Counter++; + else if ( Counter ) + { + printf( "%d ", Counter ); + Counter = 0; + } + } +} + +/**Function******************************************************************** + + Synopsis [Returns the next prime >= p.] + + Description [Copied from CUDD, for stand-aloneness.] + + SideEffects [None] + + SeeAlso [] + +******************************************************************************/ +unsigned int Cudd_PrimeAig( unsigned int p) +{ + int i,pn; + + p--; + do { + p++; + if (p&1) { + pn = 1; + i = 3; + while ((unsigned) (i * i) <= p) { + if (p % i == 0) { + pn = 0; + break; + } + i += 2; + } + } else { + pn = 0; + } + } while (!pn); + return(p); + +} /* end of Cudd_Prime */ + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + -- cgit v1.2.3