62 lines
2.6 KiB
C
62 lines
2.6 KiB
C
/* IBM_PROLOG_BEGIN_TAG */
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/* This is an automatically generated prolog. */
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/* */
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/* $Source: clib/hash.h $ */
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/* */
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/* OpenPOWER FFS Project */
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/* */
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/* Contributors Listed Below - COPYRIGHT 2014,2015 */
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/* [+] International Business Machines Corp. */
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/* */
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/* */
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/* Licensed under the Apache License, Version 2.0 (the "License"); */
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/* you may not use this file except in compliance with the License. */
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/* You may obtain a copy of the License at */
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/* */
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/* http://www.apache.org/licenses/LICENSE-2.0 */
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/* */
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/* Unless required by applicable law or agreed to in writing, software */
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/* distributed under the License is distributed on an "AS IS" BASIS, */
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/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or */
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/* implied. See the License for the specific language governing */
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/* permissions and limitations under the License. */
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/* */
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/* IBM_PROLOG_END_TAG */
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/*
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* File: hash.h
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* Author: Shaun Wetzstein <shaun@us.ibm.com>
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* Descr: Various int64 hash functions
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* Note:
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* Date: 10/03/10
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*/
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#ifndef __HASH_H__
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#define __HASH_H__
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#include <stdint.h>
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/* ======================================================================= */
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static inline int64_t int64_hash1(int64_t);
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typedef uint64_t(*hash_t) (char *, uint64_t);
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/* ======================================================================= */
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static inline int64_t int64_hash1(int64_t key)
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{
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key = ~key + (key << 15);
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key = key ^ (key >> 12);
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key = key + (key << 2);
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key = key ^ (key >> 4);
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key = key * 2057;
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key = key ^ (key >> 16);
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return key;
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}
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/* ======================================================================= */
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#endif /* __HASH_H__ */
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