src/cuBdd/cuddLCache.c

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#include "util.h"
#include "cuddInt.h"

/*---------------------------------------------------------------------------*/
/* Constant declarations                                                     */
/*---------------------------------------------------------------------------*/

#define DD_MAX_HASHTABLE_DENSITY 2      /* tells when to resize a table */

/*---------------------------------------------------------------------------*/
/* Stucture declarations                                                     */
/*---------------------------------------------------------------------------*/


/*---------------------------------------------------------------------------*/
/* Type declarations                                                         */
/*---------------------------------------------------------------------------*/


/*---------------------------------------------------------------------------*/
/* Variable declarations                                                     */
/*---------------------------------------------------------------------------*/

#ifndef lint
static char rcsid[] DD_UNUSED = "$Id: cuddLCache.c,v 1.24 2009/03/08 02:49:02 fabio Exp $";
#endif

/*---------------------------------------------------------------------------*/
/* Macro declarations                                                        */
/*---------------------------------------------------------------------------*/

#if SIZEOF_VOID_P == 8 && SIZEOF_INT == 4
#define ddLCHash2(f,g,shift) \
((((unsigned)(ptruint)(f) * DD_P1 + \
   (unsigned)(ptruint)(g)) * DD_P2) >> (shift))
#else
#define ddLCHash2(f,g,shift) \
((((unsigned)(f) * DD_P1 + (unsigned)(g)) * DD_P2) >> (shift))
#endif


#define ddLCHash3(f,g,h,shift) ddCHash2(f,g,h,shift)


/*---------------------------------------------------------------------------*/
/* Static function prototypes                                                */
/*---------------------------------------------------------------------------*/

static void cuddLocalCacheResize (DdLocalCache *cache);
DD_INLINE static unsigned int ddLCHash (DdNodePtr *key, unsigned int keysize, int shift);
static void cuddLocalCacheAddToList (DdLocalCache *cache);
static void cuddLocalCacheRemoveFromList (DdLocalCache *cache);
static int cuddHashTableResize (DdHashTable *hash);
DD_INLINE static DdHashItem * cuddHashTableAlloc (DdHashTable *hash);

/*---------------------------------------------------------------------------*/
/* Definition of exported functions                                          */
/*---------------------------------------------------------------------------*/

/*---------------------------------------------------------------------------*/
/* Definition of internal functions                                          */
/*---------------------------------------------------------------------------*/


DdLocalCache *
cuddLocalCacheInit(
  DdManager * manager /* manager */,
  unsigned int  keySize /* size of the key (number of operands) */,
  unsigned int  cacheSize /* Initial size of the cache */,
  unsigned int  maxCacheSize /* Size of the cache beyond which no resizing occurs */)
{
    DdLocalCache *cache;
    int logSize;

    cache = ALLOC(DdLocalCache,1);
    if (cache == NULL) {
        manager->errorCode = CUDD_MEMORY_OUT;
        return(NULL);
    }
    cache->manager = manager;
    cache->keysize = keySize;
    cache->itemsize = (keySize + 1) * sizeof(DdNode *);
#ifdef DD_CACHE_PROFILE
    cache->itemsize += sizeof(ptrint);
#endif
    logSize = cuddComputeFloorLog2(ddMax(cacheSize,manager->slots/2));
    cacheSize = 1 << logSize;
    cache->item = (DdLocalCacheItem *)
        ALLOC(char, cacheSize * cache->itemsize);
    if (cache->item == NULL) {
        manager->errorCode = CUDD_MEMORY_OUT;
        FREE(cache);
        return(NULL);
    }
    cache->slots = cacheSize;
    cache->shift = sizeof(int) * 8 - logSize;
    cache->maxslots = ddMin(maxCacheSize,manager->slots);
    cache->minHit = manager->minHit;
    /* Initialize to avoid division by 0 and immediate resizing. */
    cache->lookUps = (double) (int) (cacheSize * cache->minHit + 1);
    cache->hits = 0;
    manager->memused += cacheSize * cache->itemsize + sizeof(DdLocalCache);

    /* Initialize the cache. */
    memset(cache->item, 0, cacheSize * cache->itemsize);

    /* Add to manager's list of local caches for GC. */
    cuddLocalCacheAddToList(cache);

    return(cache);

} /* end of cuddLocalCacheInit */


void
cuddLocalCacheQuit(
  DdLocalCache * cache /* cache to be shut down */)
{
    cache->manager->memused -=
        cache->slots * cache->itemsize + sizeof(DdLocalCache);
    cuddLocalCacheRemoveFromList(cache);
    FREE(cache->item);
    FREE(cache);

    return;

} /* end of cuddLocalCacheQuit */


void
cuddLocalCacheInsert(
  DdLocalCache * cache,
  DdNodePtr * key,
  DdNode * value)
{
    unsigned int posn;
    DdLocalCacheItem *entry;

    posn = ddLCHash(key,cache->keysize,cache->shift);
    entry = (DdLocalCacheItem *) ((char *) cache->item +
                                  posn * cache->itemsize);
    memcpy(entry->key,key,cache->keysize * sizeof(DdNode *));
    entry->value = value;
#ifdef DD_CACHE_PROFILE
    entry->count++;
#endif

} /* end of cuddLocalCacheInsert */


DdNode *
cuddLocalCacheLookup(
  DdLocalCache * cache,
  DdNodePtr * key)
{
    unsigned int posn;
    DdLocalCacheItem *entry;
    DdNode *value;

    cache->lookUps++;
    posn = ddLCHash(key,cache->keysize,cache->shift);
    entry = (DdLocalCacheItem *) ((char *) cache->item +
                                  posn * cache->itemsize);
    if (entry->value != NULL &&
        memcmp(key,entry->key,cache->keysize*sizeof(DdNode *)) == 0) {
        cache->hits++;
        value = Cudd_Regular(entry->value);
        if (value->ref == 0) {
            cuddReclaim(cache->manager,value);
        }
        return(entry->value);
    }

    /* Cache miss: decide whether to resize */

    if (cache->slots < cache->maxslots &&
        cache->hits > cache->lookUps * cache->minHit) {
        cuddLocalCacheResize(cache);
    }

    return(NULL);

} /* end of cuddLocalCacheLookup */


void
cuddLocalCacheClearDead(
  DdManager * manager)
{
    DdLocalCache *cache = manager->localCaches;
    unsigned int keysize;
    unsigned int itemsize;
    unsigned int slots;
    DdLocalCacheItem *item;
    DdNodePtr *key;
    unsigned int i, j;

    while (cache != NULL) {
        keysize = cache->keysize;
        itemsize = cache->itemsize;
        slots = cache->slots;
        item = cache->item;
        for (i = 0; i < slots; i++) {
            if (item->value != NULL) {
                if (Cudd_Regular(item->value)->ref == 0) {
                    item->value = NULL;
                } else {
                    key = item->key;
                    for (j = 0; j < keysize; j++) {
                        if (Cudd_Regular(key[j])->ref == 0) {
                            item->value = NULL;
                            break;
                        }
                    }
                }
            }
            item = (DdLocalCacheItem *) ((char *) item + itemsize);
        }
        cache = cache->next;
    }
    return;

} /* end of cuddLocalCacheClearDead */


void
cuddLocalCacheClearAll(
  DdManager * manager)
{
    DdLocalCache *cache = manager->localCaches;

    while (cache != NULL) {
        memset(cache->item, 0, cache->slots * cache->itemsize);
        cache = cache->next;
    }
    return;

} /* end of cuddLocalCacheClearAll */


#ifdef DD_CACHE_PROFILE

#define DD_HYSTO_BINS 8

int
cuddLocalCacheProfile(
  DdLocalCache * cache)
{
    double count, mean, meansq, stddev, expected;
    long max, min;
    int imax, imin;
    int i, retval, slots;
    long *hystogram;
    int nbins = DD_HYSTO_BINS;
    int bin;
    long thiscount;
    double totalcount;
    int nzeroes;
    DdLocalCacheItem *entry;
    FILE *fp = cache->manager->out;

    slots = cache->slots;

    meansq = mean = expected = 0.0;
    max = min = (long) cache->item[0].count;
    imax = imin = nzeroes = 0;
    totalcount = 0.0;

    hystogram = ALLOC(long, nbins);
    if (hystogram == NULL) {
        return(0);
    }
    for (i = 0; i < nbins; i++) {
        hystogram[i] = 0;
    }

    for (i = 0; i < slots; i++) {
        entry = (DdLocalCacheItem *) ((char *) cache->item +
                                      i * cache->itemsize);
        thiscount = (long) entry->count;
        if (thiscount > max) {
            max = thiscount;
            imax = i;
        }
        if (thiscount < min) {
            min = thiscount;
            imin = i;
        }
        if (thiscount == 0) {
            nzeroes++;
        }
        count = (double) thiscount;
        mean += count;
        meansq += count * count;
        totalcount += count;
        expected += count * (double) i;
        bin = (i * nbins) / slots;
        hystogram[bin] += thiscount;
    }
    mean /= (double) slots;
    meansq /= (double) slots;
    stddev = sqrt(meansq - mean*mean);

    retval = fprintf(fp,"Cache stats: slots = %d average = %g ", slots, mean);
    if (retval == EOF) return(0);
    retval = fprintf(fp,"standard deviation = %g\n", stddev);
    if (retval == EOF) return(0);
    retval = fprintf(fp,"Cache max accesses = %ld for slot %d\n", max, imax);
    if (retval == EOF) return(0);
    retval = fprintf(fp,"Cache min accesses = %ld for slot %d\n", min, imin);
    if (retval == EOF) return(0);
    retval = fprintf(fp,"Cache unused slots = %d\n", nzeroes);
    if (retval == EOF) return(0);

    if (totalcount) {
        expected /= totalcount;
        retval = fprintf(fp,"Cache access hystogram for %d bins", nbins);
        if (retval == EOF) return(0);
        retval = fprintf(fp," (expected bin value = %g)\n# ", expected);
        if (retval == EOF) return(0);
        for (i = nbins - 1; i>=0; i--) {
            retval = fprintf(fp,"%ld ", hystogram[i]);
            if (retval == EOF) return(0);
        }
        retval = fprintf(fp,"\n");
        if (retval == EOF) return(0);
    }

    FREE(hystogram);
    return(1);

} /* end of cuddLocalCacheProfile */
#endif


DdHashTable *
cuddHashTableInit(
  DdManager * manager,
  unsigned int  keySize,
  unsigned int  initSize)
{
    DdHashTable *hash;
    int logSize;

#ifdef __osf__
#pragma pointer_size save
#pragma pointer_size short
#endif
    hash = ALLOC(DdHashTable, 1);
    if (hash == NULL) {
        manager->errorCode = CUDD_MEMORY_OUT;
        return(NULL);
    }
    hash->keysize = keySize;
    hash->manager = manager;
    hash->memoryList = NULL;
    hash->nextFree = NULL;
    hash->itemsize = (keySize + 1) * sizeof(DdNode *) +
        sizeof(ptrint) + sizeof(DdHashItem *);
    /* We have to guarantee that the shift be < 32. */
    if (initSize < 2) initSize = 2;
    logSize = cuddComputeFloorLog2(initSize);
    hash->numBuckets = 1 << logSize;
    hash->shift = sizeof(int) * 8 - logSize;
    hash->bucket = ALLOC(DdHashItem *, hash->numBuckets);
    if (hash->bucket == NULL) {
        manager->errorCode = CUDD_MEMORY_OUT;
        FREE(hash);
        return(NULL);
    }
    memset(hash->bucket, 0, hash->numBuckets * sizeof(DdHashItem *));
    hash->size = 0;
    hash->maxsize = hash->numBuckets * DD_MAX_HASHTABLE_DENSITY;
#ifdef __osf__
#pragma pointer_size restore
#endif
    return(hash);

} /* end of cuddHashTableInit */


void
cuddHashTableQuit(
  DdHashTable * hash)
{
#ifdef __osf__
#pragma pointer_size save
#pragma pointer_size short
#endif
    unsigned int i;
    DdManager *dd = hash->manager;
    DdHashItem *bucket;
    DdHashItem **memlist, **nextmem;
    unsigned int numBuckets = hash->numBuckets;

    for (i = 0; i < numBuckets; i++) {
        bucket = hash->bucket[i];
        while (bucket != NULL) {
            Cudd_RecursiveDeref(dd, bucket->value);
            bucket = bucket->next;
        }
    }

    memlist = hash->memoryList;
    while (memlist != NULL) {
        nextmem = (DdHashItem **) memlist[0];
        FREE(memlist);
        memlist = nextmem;
    }

    FREE(hash->bucket);
    FREE(hash);
#ifdef __osf__
#pragma pointer_size restore
#endif

    return;

} /* end of cuddHashTableQuit */


int
cuddHashTableInsert(
  DdHashTable * hash,
  DdNodePtr * key,
  DdNode * value,
  ptrint count)
{
    int result;
    unsigned int posn;
    DdHashItem *item;
    unsigned int i;

#ifdef DD_DEBUG
    assert(hash->keysize > 3);
#endif

    if (hash->size > hash->maxsize) {
        result = cuddHashTableResize(hash);
        if (result == 0) return(0);
    }
    item = cuddHashTableAlloc(hash);
    if (item == NULL) return(0);
    hash->size++;
    item->value = value;
    cuddRef(value);
    item->count = count;
    for (i = 0; i < hash->keysize; i++) {
        item->key[i] = key[i];
    }
    posn = ddLCHash(key,hash->keysize,hash->shift);
    item->next = hash->bucket[posn];
    hash->bucket[posn] = item;

    return(1);

} /* end of cuddHashTableInsert */


DdNode *
cuddHashTableLookup(
  DdHashTable * hash,
  DdNodePtr * key)
{
    unsigned int posn;
    DdHashItem *item, *prev;
    unsigned int i, keysize;

#ifdef DD_DEBUG
    assert(hash->keysize > 3);
#endif

    posn = ddLCHash(key,hash->keysize,hash->shift);
    item = hash->bucket[posn];
    prev = NULL;

    keysize = hash->keysize;
    while (item != NULL) {
        DdNodePtr *key2 = item->key;
        int equal = 1;
        for (i = 0; i < keysize; i++) {
            if (key[i] != key2[i]) {
                equal = 0;
                break;
            }
        }
        if (equal) {
            DdNode *value = item->value;
            cuddSatDec(item->count);
            if (item->count == 0) {
                cuddDeref(value);
                if (prev == NULL) {
                    hash->bucket[posn] = item->next;
                } else {
                    prev->next = item->next;
                }
                item->next = hash->nextFree;
                hash->nextFree = item;
                hash->size--;
            }
            return(value);
        }
        prev = item;
        item = item->next;
    }
    return(NULL);

} /* end of cuddHashTableLookup */


int
cuddHashTableInsert1(
  DdHashTable * hash,
  DdNode * f,
  DdNode * value,
  ptrint count)
{
    int result;
    unsigned int posn;
    DdHashItem *item;

#ifdef DD_DEBUG
    assert(hash->keysize == 1);
#endif

    if (hash->size > hash->maxsize) {
        result = cuddHashTableResize(hash);
        if (result == 0) return(0);
    }
    item = cuddHashTableAlloc(hash);
    if (item == NULL) return(0);
    hash->size++;
    item->value = value;
    cuddRef(value);
    item->count = count;
    item->key[0] = f;
    posn = ddLCHash2(f,f,hash->shift);
    item->next = hash->bucket[posn];
    hash->bucket[posn] = item;

    return(1);

} /* end of cuddHashTableInsert1 */


DdNode *
cuddHashTableLookup1(
  DdHashTable * hash,
  DdNode * f)
{
    unsigned int posn;
    DdHashItem *item, *prev;

#ifdef DD_DEBUG
    assert(hash->keysize == 1);
#endif

    posn = ddLCHash2(f,f,hash->shift);
    item = hash->bucket[posn];
    prev = NULL;

    while (item != NULL) {
        DdNodePtr *key = item->key;
        if (f == key[0]) {
            DdNode *value = item->value;
            cuddSatDec(item->count);
            if (item->count == 0) {
                cuddDeref(value);
                if (prev == NULL) {
                    hash->bucket[posn] = item->next;
                } else {
                    prev->next = item->next;
                }
                item->next = hash->nextFree;
                hash->nextFree = item;
                hash->size--;
            }
            return(value);
        }
        prev = item;
        item = item->next;
    }
    return(NULL);

} /* end of cuddHashTableLookup1 */


int
cuddHashTableInsert2(
  DdHashTable * hash,
  DdNode * f,
  DdNode * g,
  DdNode * value,
  ptrint count)
{
    int result;
    unsigned int posn;
    DdHashItem *item;

#ifdef DD_DEBUG
    assert(hash->keysize == 2);
#endif

    if (hash->size > hash->maxsize) {
        result = cuddHashTableResize(hash);
        if (result == 0) return(0);
    }
    item = cuddHashTableAlloc(hash);
    if (item == NULL) return(0);
    hash->size++;
    item->value = value;
    cuddRef(value);
    item->count = count;
    item->key[0] = f;
    item->key[1] = g;
    posn = ddLCHash2(f,g,hash->shift);
    item->next = hash->bucket[posn];
    hash->bucket[posn] = item;

    return(1);

} /* end of cuddHashTableInsert2 */


DdNode *
cuddHashTableLookup2(
  DdHashTable * hash,
  DdNode * f,
  DdNode * g)
{
    unsigned int posn;
    DdHashItem *item, *prev;

#ifdef DD_DEBUG
    assert(hash->keysize == 2);
#endif

    posn = ddLCHash2(f,g,hash->shift);
    item = hash->bucket[posn];
    prev = NULL;

    while (item != NULL) {
        DdNodePtr *key = item->key;
        if ((f == key[0]) && (g == key[1])) {
            DdNode *value = item->value;
            cuddSatDec(item->count);
            if (item->count == 0) {
                cuddDeref(value);
                if (prev == NULL) {
                    hash->bucket[posn] = item->next;
                } else {
                    prev->next = item->next;
                }
                item->next = hash->nextFree;
                hash->nextFree = item;
                hash->size--;
            }
            return(value);
        }
        prev = item;
        item = item->next;
    }
    return(NULL);

} /* end of cuddHashTableLookup2 */


int
cuddHashTableInsert3(
  DdHashTable * hash,
  DdNode * f,
  DdNode * g,
  DdNode * h,
  DdNode * value,
  ptrint count)
{
    int result;
    unsigned int posn;
    DdHashItem *item;

#ifdef DD_DEBUG
    assert(hash->keysize == 3);
#endif

    if (hash->size > hash->maxsize) {
        result = cuddHashTableResize(hash);
        if (result == 0) return(0);
    }
    item = cuddHashTableAlloc(hash);
    if (item == NULL) return(0);
    hash->size++;
    item->value = value;
    cuddRef(value);
    item->count = count;
    item->key[0] = f;
    item->key[1] = g;
    item->key[2] = h;
    posn = ddLCHash3(f,g,h,hash->shift);
    item->next = hash->bucket[posn];
    hash->bucket[posn] = item;

    return(1);

} /* end of cuddHashTableInsert3 */


DdNode *
cuddHashTableLookup3(
  DdHashTable * hash,
  DdNode * f,
  DdNode * g,
  DdNode * h)
{
    unsigned int posn;
    DdHashItem *item, *prev;

#ifdef DD_DEBUG
    assert(hash->keysize == 3);
#endif

    posn = ddLCHash3(f,g,h,hash->shift);
    item = hash->bucket[posn];
    prev = NULL;

    while (item != NULL) {
        DdNodePtr *key = item->key;
        if ((f == key[0]) && (g == key[1]) && (h == key[2])) {
            DdNode *value = item->value;
            cuddSatDec(item->count);
            if (item->count == 0) {
                cuddDeref(value);
                if (prev == NULL) {
                    hash->bucket[posn] = item->next;
                } else {
                    prev->next = item->next;
                }
                item->next = hash->nextFree;
                hash->nextFree = item;
                hash->size--;
            }
            return(value);
        }
        prev = item;
        item = item->next;
    }
    return(NULL);

} /* end of cuddHashTableLookup3 */


/*---------------------------------------------------------------------------*/
/* Definition of static functions                                            */
/*---------------------------------------------------------------------------*/


static void
cuddLocalCacheResize(
  DdLocalCache * cache)
{
    DdLocalCacheItem *item, *olditem, *entry, *old;
    int i, shift;
    unsigned int posn;
    unsigned int slots, oldslots;
    extern DD_OOMFP MMoutOfMemory;
    DD_OOMFP saveHandler;

    olditem = cache->item;
    oldslots = cache->slots;
    slots = cache->slots = oldslots << 1;

#ifdef DD_VERBOSE
    (void) fprintf(cache->manager->err,
                   "Resizing local cache from %d to %d entries\n",
                   oldslots, slots);
    (void) fprintf(cache->manager->err,
                   "\thits = %.0f\tlookups = %.0f\thit ratio = %5.3f\n",
                   cache->hits, cache->lookUps, cache->hits / cache->lookUps);
#endif

    saveHandler = MMoutOfMemory;
    MMoutOfMemory = Cudd_OutOfMem;
    cache->item = item =
        (DdLocalCacheItem *) ALLOC(char, slots * cache->itemsize);
    MMoutOfMemory = saveHandler;
    /* If we fail to allocate the new table we just give up. */
    if (item == NULL) {
#ifdef DD_VERBOSE
        (void) fprintf(cache->manager->err,"Resizing failed. Giving up.\n");
#endif
        cache->slots = oldslots;
        cache->item = olditem;
        /* Do not try to resize again. */
        cache->maxslots = oldslots - 1;
        return;
    }
    shift = --(cache->shift);
    cache->manager->memused += (slots - oldslots) * cache->itemsize;

    /* Clear new cache. */
    memset(item, 0, slots * cache->itemsize);

    /* Copy from old cache to new one. */
    for (i = 0; (unsigned) i < oldslots; i++) {
        old = (DdLocalCacheItem *) ((char *) olditem + i * cache->itemsize);
        if (old->value != NULL) {
            posn = ddLCHash(old->key,cache->keysize,shift);
            entry = (DdLocalCacheItem *) ((char *) item +
                                          posn * cache->itemsize);
            memcpy(entry->key,old->key,cache->keysize*sizeof(DdNode *));
            entry->value = old->value;
        }
    }

    FREE(olditem);

    /* Reinitialize measurements so as to avoid division by 0 and
    ** immediate resizing.
    */
    cache->lookUps = (double) (int) (slots * cache->minHit + 1);
    cache->hits = 0;

} /* end of cuddLocalCacheResize */


DD_INLINE
static unsigned int
ddLCHash(
  DdNodePtr * key,
  unsigned int keysize,
  int shift)
{
    unsigned int val = (unsigned int) (ptrint) key[0] * DD_P2;
    unsigned int i;

    for (i = 1; i < keysize; i++) {
        val = val * DD_P1 + (int) (ptrint) key[i];
    }

    return(val >> shift);

} /* end of ddLCHash */


static void
cuddLocalCacheAddToList(
  DdLocalCache * cache)
{
    DdManager *manager = cache->manager;

    cache->next = manager->localCaches;
    manager->localCaches = cache;
    return;

} /* end of cuddLocalCacheAddToList */


static void
cuddLocalCacheRemoveFromList(
  DdLocalCache * cache)
{
    DdManager *manager = cache->manager;
#ifdef __osf__
#pragma pointer_size save
#pragma pointer_size short
#endif
    DdLocalCache **prevCache, *nextCache;
#ifdef __osf__
#pragma pointer_size restore
#endif

    prevCache = &(manager->localCaches);
    nextCache = manager->localCaches;

    while (nextCache != NULL) {
        if (nextCache == cache) {
            *prevCache = nextCache->next;
            return;
        }
        prevCache = &(nextCache->next);
        nextCache = nextCache->next;
    }
    return;                     /* should never get here */

} /* end of cuddLocalCacheRemoveFromList */


static int
cuddHashTableResize(
  DdHashTable * hash)
{
    int j;
    unsigned int posn;
    DdHashItem *item;
    DdHashItem *next;
#ifdef __osf__
#pragma pointer_size save
#pragma pointer_size short
#endif
    DdNode **key;
    int numBuckets;
    DdHashItem **buckets;
    DdHashItem **oldBuckets = hash->bucket;
#ifdef __osf__
#pragma pointer_size restore
#endif
    int shift;
    int oldNumBuckets = hash->numBuckets;
    extern DD_OOMFP MMoutOfMemory;
    DD_OOMFP saveHandler;

    /* Compute the new size of the table. */
    numBuckets = oldNumBuckets << 1;
    saveHandler = MMoutOfMemory;
    MMoutOfMemory = Cudd_OutOfMem;
#ifdef __osf__
#pragma pointer_size save
#pragma pointer_size short
#endif
    buckets = ALLOC(DdHashItem *, numBuckets);
    MMoutOfMemory = saveHandler;
    if (buckets == NULL) {
        hash->maxsize <<= 1;
        return(1);
    }

    hash->bucket = buckets;
    hash->numBuckets = numBuckets;
    shift = --(hash->shift);
    hash->maxsize <<= 1;
    memset(buckets, 0, numBuckets * sizeof(DdHashItem *));
#ifdef __osf__
#pragma pointer_size restore
#endif
    if (hash->keysize == 1) {
        for (j = 0; j < oldNumBuckets; j++) {
            item = oldBuckets[j];
            while (item != NULL) {
                next = item->next;
                key = item->key;
                posn = ddLCHash2(key[0], key[0], shift);
                item->next = buckets[posn];
                buckets[posn] = item;
                item = next;
            }
        }
    } else if (hash->keysize == 2) {
        for (j = 0; j < oldNumBuckets; j++) {
            item = oldBuckets[j];
            while (item != NULL) {
                next = item->next;
                key = item->key;
                posn = ddLCHash2(key[0], key[1], shift);
                item->next = buckets[posn];
                buckets[posn] = item;
                item = next;
            }
        }
    } else if (hash->keysize == 3) {
        for (j = 0; j < oldNumBuckets; j++) {
            item = oldBuckets[j];
            while (item != NULL) {
                next = item->next;
                key = item->key;
                posn = ddLCHash3(key[0], key[1], key[2], shift);
                item->next = buckets[posn];
                buckets[posn] = item;
                item = next;
            }
        }
    } else {
        for (j = 0; j < oldNumBuckets; j++) {
            item = oldBuckets[j];
            while (item != NULL) {
                next = item->next;
                posn = ddLCHash(item->key, hash->keysize, shift);
                item->next = buckets[posn];
                buckets[posn] = item;
                item = next;
            }
        }
    }
    FREE(oldBuckets);
    return(1);

} /* end of cuddHashTableResize */


DD_INLINE
static DdHashItem *
cuddHashTableAlloc(
  DdHashTable * hash)
{
    int i;
    unsigned int itemsize = hash->itemsize;
    extern DD_OOMFP MMoutOfMemory;
    DD_OOMFP saveHandler;
#ifdef __osf__
#pragma pointer_size save
#pragma pointer_size short
#endif
    DdHashItem **mem, *thisOne, *next, *item;

    if (hash->nextFree == NULL) {
        saveHandler = MMoutOfMemory;
        MMoutOfMemory = Cudd_OutOfMem;
        mem = (DdHashItem **) ALLOC(char,(DD_MEM_CHUNK+1) * itemsize);
        MMoutOfMemory = saveHandler;
#ifdef __osf__
#pragma pointer_size restore
#endif
        if (mem == NULL) {
            if (hash->manager->stash != NULL) {
                FREE(hash->manager->stash);
                hash->manager->stash = NULL;
                /* Inhibit resizing of tables. */
                hash->manager->maxCacheHard = hash->manager->cacheSlots - 1;
                hash->manager->cacheSlack = - (int) (hash->manager->cacheSlots + 1);
                for (i = 0; i < hash->manager->size; i++) {
                    hash->manager->subtables[i].maxKeys <<= 2;
                }
                hash->manager->gcFrac = 0.2;
                hash->manager->minDead =
                    (unsigned) (0.2 * (double) hash->manager->slots);
#ifdef __osf__
#pragma pointer_size save
#pragma pointer_size short
#endif
                mem = (DdHashItem **) ALLOC(char,(DD_MEM_CHUNK+1) * itemsize);
#ifdef __osf__
#pragma pointer_size restore
#endif
            }
            if (mem == NULL) {
                (*MMoutOfMemory)((long)((DD_MEM_CHUNK + 1) * itemsize));
                hash->manager->errorCode = CUDD_MEMORY_OUT;
                return(NULL);
            }
        }

        mem[0] = (DdHashItem *) hash->memoryList;
        hash->memoryList = mem;

        thisOne = (DdHashItem *) ((char *) mem + itemsize);
        hash->nextFree = thisOne;
        for (i = 1; i < DD_MEM_CHUNK; i++) {
            next = (DdHashItem *) ((char *) thisOne + itemsize);
            thisOne->next = next;
            thisOne = next;
        }

        thisOne->next = NULL;

    }
    item = hash->nextFree;
    hash->nextFree = item->next;
    return(item);

} /* end of cuddHashTableAlloc */

---