71 lines
1.8 KiB
C
71 lines
1.8 KiB
C
/******************************************************************************/
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#ifdef JEMALLOC_H_TYPES
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#endif /* JEMALLOC_H_TYPES */
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/******************************************************************************/
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#ifdef JEMALLOC_H_STRUCTS
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#endif /* JEMALLOC_H_STRUCTS */
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/******************************************************************************/
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#ifdef JEMALLOC_H_EXTERNS
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#endif /* JEMALLOC_H_EXTERNS */
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/******************************************************************************/
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#ifdef JEMALLOC_H_INLINES
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#ifndef JEMALLOC_ENABLE_INLINE
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uint64_t hash(const void *key, size_t len, uint64_t seed);
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#endif
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#if (defined(JEMALLOC_ENABLE_INLINE) || defined(JEMALLOC_HASH_C_))
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/*
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* The following hash function is based on MurmurHash64A(), placed into the
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* public domain by Austin Appleby. See http://murmurhash.googlepages.com/ for
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* details.
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*/
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JEMALLOC_INLINE uint64_t
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hash(const void *key, size_t len, uint64_t seed)
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{
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const uint64_t m = 0xc6a4a7935bd1e995LLU;
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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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const unsigned char *data2;
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assert(((uintptr_t)key & 0x7) == 0);
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while(data != end) {
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uint64_t k = *data++;
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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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data2 = (const unsigned char *)data;
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switch(len & 7) {
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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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#endif
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#endif /* JEMALLOC_H_INLINES */
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/******************************************************************************/
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