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/*
* Copyright (c) International Business Machines Corp., 2014
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* File: hash.h
* Author: Shaun Wetzstein <shaun@us.ibm.com>
* Descr: Various int32 hash functions
* Note:
* Date: 10/03/10
*/
#ifndef __HASH_H__
#define __HASH_H__
#include <stdint.h>
/* ======================================================================= */
static inline int32_t int32_hash1(int32_t);
typedef uint32_t(*hash_t) (char *, uint32_t);
/* ======================================================================= */
static inline int32_t int32_hash1(int32_t key)
{
key = ~key + (key << 15);
key = key ^ (key >> 12);
key = key + (key << 2);
key = key ^ (key >> 4);
key = key * 2057;
key = key ^ (key >> 16);
return key;
}
/* ======================================================================= */
#endif /* __HASH_H__ */
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