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Justin Ethier
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include/cyclone/ck_ht_hash.h
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269
include/cyclone/ck_ht_hash.h
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/*
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* Copyright 2012-2015 Samy Al Bahra
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* Copyright 2011-2014 AppNexus, Inc.
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*
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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
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* are met:
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* 1. 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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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef CK_HT_HASH_H
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#define CK_HT_HASH_H
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/*
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* This is the Murmur hash written by Austin Appleby.
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*/
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#include <ck_stdint.h>
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#include <ck_string.h>
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//-----------------------------------------------------------------------------
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// MurmurHash3 was written by Austin Appleby, and is placed in the public
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// domain. The author hereby disclaims copyright to this source code.
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// Note - The x86 and x64 versions do _not_ produce the same results, as the
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// algorithms are optimized for their respective platforms. You can still
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// compile and run any of them on any platform, but your performance with the
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// non-native version will be less than optimal.
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//-----------------------------------------------------------------------------
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// Platform-specific functions and macros
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// Microsoft Visual Studio
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#if defined(_MSC_VER)
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#define FORCE_INLINE __forceinline
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#include <stdlib.h>
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#define ROTL32(x,y) _rotl(x,y)
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#define ROTL64(x,y) _rotl64(x,y)
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#define BIG_CONSTANT(x) (x)
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// Other compilers
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#else // defined(_MSC_VER)
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#define FORCE_INLINE inline __attribute__((always_inline))
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static inline uint32_t rotl32 ( uint32_t x, int8_t r )
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{
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return (x << r) | (x >> (32 - r));
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}
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static inline uint64_t rotl64 ( uint64_t x, int8_t r )
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{
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return (x << r) | (x >> (64 - r));
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}
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#define ROTL32(x,y) rotl32(x,y)
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#define ROTL64(x,y) rotl64(x,y)
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#define BIG_CONSTANT(x) (x##LLU)
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#endif // !defined(_MSC_VER)
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//-----------------------------------------------------------------------------
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// Block read - if your platform needs to do endian-swapping or can only
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// handle aligned reads, do the conversion here
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FORCE_INLINE static uint32_t getblock ( const uint32_t * p, int i )
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{
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return p[i];
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}
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//-----------------------------------------------------------------------------
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// Finalization mix - force all bits of a hash block to avalanche
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FORCE_INLINE static uint32_t fmix ( uint32_t h )
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{
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h ^= h >> 16;
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h *= 0x85ebca6b;
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h ^= h >> 13;
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h *= 0xc2b2ae35;
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h ^= h >> 16;
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return h;
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}
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//-----------------------------------------------------------------------------
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static inline void MurmurHash3_x86_32 ( const void * key, int len,
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uint32_t seed, uint32_t * out )
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{
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const uint8_t * data = (const uint8_t*)key;
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const int nblocks = len / 4;
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int i;
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uint32_t h1 = seed;
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uint32_t c1 = 0xcc9e2d51;
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uint32_t c2 = 0x1b873593;
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//----------
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// body
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const uint32_t * blocks = (const uint32_t *)(const void *)(data + nblocks*4);
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for(i = -nblocks; i; i++)
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{
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uint32_t k1 = getblock(blocks,i);
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k1 *= c1;
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k1 = ROTL32(k1,15);
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k1 *= c2;
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h1 ^= k1;
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h1 = ROTL32(h1,13);
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h1 = h1*5+0xe6546b64;
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}
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//----------
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// tail
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const uint8_t * tail = (const uint8_t*)(data + nblocks*4);
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uint32_t k1 = 0;
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switch(len & 3)
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{
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case 3: k1 ^= tail[2] << 16;
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case 2: k1 ^= tail[1] << 8;
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case 1: k1 ^= tail[0];
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k1 *= c1; k1 = ROTL32(k1,15); k1 *= c2; h1 ^= k1;
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};
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//----------
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// finalization
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h1 ^= len;
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h1 = fmix(h1);
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*(uint32_t *)out = h1;
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}
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static inline uint64_t MurmurHash64A ( const void * key, int len, uint64_t seed )
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{
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const uint64_t m = BIG_CONSTANT(0xc6a4a7935bd1e995);
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const int r = 47;
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uint64_t h = seed ^ (len * m);
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const uint64_t * data = (const uint64_t *)key;
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const uint64_t * end = data + (len/8);
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while(data != end)
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{
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uint64_t k;
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if (!((uintptr_t)data & 0x7))
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k = *data++;
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else {
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memcpy(&k, data, sizeof(k));
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data++;
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}
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k *= m;
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k ^= k >> r;
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k *= m;
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h ^= k;
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h *= m;
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}
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const unsigned char * data2 = (const unsigned char*)data;
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switch(len & 7)
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{
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case 7: h ^= (uint64_t)(data2[6]) << 48;
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case 6: h ^= (uint64_t)(data2[5]) << 40;
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case 5: h ^= (uint64_t)(data2[4]) << 32;
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case 4: h ^= (uint64_t)(data2[3]) << 24;
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case 3: h ^= (uint64_t)(data2[2]) << 16;
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case 2: h ^= (uint64_t)(data2[1]) << 8;
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case 1: h ^= (uint64_t)(data2[0]);
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h *= m;
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};
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h ^= h >> r;
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h *= m;
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h ^= h >> r;
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return h;
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}
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// 64-bit hash for 32-bit platforms
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static inline uint64_t MurmurHash64B ( const void * key, int len, uint64_t seed )
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{
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const uint32_t m = 0x5bd1e995;
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const int r = 24;
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uint32_t h1 = (uint32_t)(seed) ^ len;
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uint32_t h2 = (uint32_t)(seed >> 32);
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const uint32_t * data = (const uint32_t *)key;
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while(len >= 8)
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{
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uint32_t k1 = *data++;
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k1 *= m; k1 ^= k1 >> r; k1 *= m;
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h1 *= m; h1 ^= k1;
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len -= 4;
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uint32_t k2 = *data++;
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k2 *= m; k2 ^= k2 >> r; k2 *= m;
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h2 *= m; h2 ^= k2;
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len -= 4;
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}
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if(len >= 4)
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{
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uint32_t k1 = *data++;
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k1 *= m; k1 ^= k1 >> r; k1 *= m;
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h1 *= m; h1 ^= k1;
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len -= 4;
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}
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switch(len)
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{
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case 3: h2 ^= ((const unsigned char*)data)[2] << 16;
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case 2: h2 ^= ((const unsigned char*)data)[1] << 8;
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case 1: h2 ^= ((const unsigned char*)data)[0];
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h2 *= m;
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};
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h1 ^= h2 >> 18; h1 *= m;
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h2 ^= h1 >> 22; h2 *= m;
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h1 ^= h2 >> 17; h1 *= m;
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h2 ^= h1 >> 19; h2 *= m;
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uint64_t h = h1;
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h = (h << 32) | h2;
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return h;
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}
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#endif /* CK_HT_HASH_H */
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