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Add a one-item cache into the hash table. This reduces the number of hash computations by roughly 20%
darcs-hash:20070116163707-ac50b-214a16d4210d32fb50693e71a14b6b8f3fededfe.gz
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parent
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commit
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12
util.c
12
util.c
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@ -208,6 +208,7 @@ void hash_init2( hash_table_t *h,
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h->count=0;
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h->count=0;
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h->hash_func = hash_func;
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h->hash_func = hash_func;
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h->compare_func = compare_func;
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h->compare_func = compare_func;
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h->cache=-1;
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}
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}
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void hash_init( hash_table_t *h,
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void hash_init( hash_table_t *h,
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@ -219,6 +220,7 @@ void hash_init( hash_table_t *h,
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h->count=0;
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h->count=0;
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h->hash_func = hash_func;
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h->hash_func = hash_func;
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h->compare_func = compare_func;
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h->compare_func = compare_func;
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h->cache=-1;
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}
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}
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@ -237,6 +239,14 @@ static int hash_search( hash_table_t *h,
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int hv;
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int hv;
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int pos;
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int pos;
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if( h->cache>=0 && h->arr[h->cache].key)
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{
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if( h->compare_func( h->arr[h->cache].key, key ) )
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{
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return h->cache;
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}
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}
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hv = h->hash_func( key );
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hv = h->hash_func( key );
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pos = (hv & 0x7fffffff) % h->size;
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pos = (hv & 0x7fffffff) % h->size;
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while(1)
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while(1)
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@ -244,6 +254,7 @@ static int hash_search( hash_table_t *h,
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if( (h->arr[pos].key == 0 ) ||
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if( (h->arr[pos].key == 0 ) ||
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( h->compare_func( h->arr[pos].key, key ) ) )
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( h->compare_func( h->arr[pos].key, key ) ) )
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{
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{
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h->cache = pos;
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return pos;
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return pos;
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}
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}
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pos++;
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pos++;
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@ -268,6 +279,7 @@ static int hash_realloc( hash_table_t *h,
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int i;
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int i;
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h->cache = -1;
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h->arr = malloc( sizeof( hash_struct_t) * sz );
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h->arr = malloc( sizeof( hash_struct_t) * sz );
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if( h->arr == 0 )
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if( h->arr == 0 )
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{
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{
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2
util.h
2
util.h
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@ -73,6 +73,8 @@ typedef struct hash_table
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{
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{
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/** The array containing the data */
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/** The array containing the data */
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hash_struct_t *arr;
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hash_struct_t *arr;
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/** A simple one item cache. This should always point to the index of the last item to be used */
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int cache;
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/** Number of elements */
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/** Number of elements */
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int count;
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int count;
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/** Length of array */
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/** Length of array */
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