7cd468a3d7
Change-Id: I7b51f88292e057c6443b12224486f2d0c9f8ae23 Signed-off-by: Damjan Marion <damarion@cisco.com>
87 lines
2.9 KiB
C
87 lines
2.9 KiB
C
/*
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* Copyright (c) 2015 Cisco and/or its affiliates.
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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 implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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Original license for the code used to construct
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clib_xxhash(...).
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xxHash - Fast Hash algorithm
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Copyright (C) 2012-2014, Yann Collet.
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BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the following disclaimer
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in the documentation and/or other materials provided with the
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distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __included_xxhash_h__
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#define __included_xxhash_h__
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#define PRIME64_1 11400714785074694791ULL
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#define PRIME64_2 14029467366897019727ULL
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#define PRIME64_3 1609587929392839161ULL
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#define PRIME64_4 9650029242287828579ULL
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#define PRIME64_5 2870177450012600261ULL
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#define XXH_rotl64(x,r) ((x << r) | (x >> (64 - r)))
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static inline u64
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clib_xxhash (u64 key)
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{
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u64 k1, h64;
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k1 = key;
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h64 = 0x9e3779b97f4a7c13LL + PRIME64_5 + 8;
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k1 *= PRIME64_2;
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k1 = XXH_rotl64 (k1, 31);
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k1 *= PRIME64_1;
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h64 ^= k1;
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h64 = XXH_rotl64 (h64, 27) * PRIME64_1 + PRIME64_4;
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h64 ^= h64 >> 33;
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h64 *= PRIME64_2;
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h64 ^= h64 >> 29;
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h64 *= PRIME64_3;
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h64 ^= h64 >> 32;
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return h64;
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}
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#endif /* __included_xxhash_h__ */
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/*
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* fd.io coding-style-patch-verification: ON
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*
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* Local Variables:
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* eval: (c-set-style "gnu")
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* End:
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*/
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