This avoids unnecessary re-allocations and reinsertions. On webkit.git
(i.e. about 182k inserts to the name hash table), this reduces about
100ms out of 3s user time.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
struct hash_table file_table;
init_hash(&file_table);
+ preallocate_hash(&file_table, rename_src_nr + rename_dst_nr);
for (i = 0; i < rename_src_nr; i++)
insert_file_table(&file_table, -1, i, rename_src[i].p->one);
table->array = NULL;
}
+static inline void preallocate_hash(struct hash_table *table, unsigned int elts)
+{
+ assert(table->size == 0 && table->nr == 0 && table->array == NULL);
+ table->size = elts * 2;
+ table->array = xcalloc(sizeof(struct hash_table_entry), table->size);
+}
+
#endif
if (istate->name_hash_initialized)
return;
+ if (istate->cache_nr)
+ preallocate_hash(&istate->name_hash, istate->cache_nr);
for (nr = 0; nr < istate->cache_nr; nr++)
hash_index_entry(istate, istate->cache[nr]);
istate->name_hash_initialized = 1;