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306 lines
7.1 KiB
306 lines
7.1 KiB
/*------------------------------------------------------------------*/ |
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/* Note - The x86 and x64 versions do _not_ produce the same */ |
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/* results, as the algorithms are optimized for their respective */ |
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/* platforms. You can still compile and run any of them on any */ |
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/* platform, but your performance with the non-native version */ |
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/* will be less than optimal. */ |
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#include "murmur3.h" |
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/*------------------------------------------------------------------*/ |
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/* Platform-specific functions and macros */ |
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static 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 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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/*------------------------------------------------------------------*/ |
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/* Block read - if your platform needs to do endian-swapping or can */ |
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/* only handle aligned reads, do the conversion here */ |
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#define getblock(p, i) (p[i]) |
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/*------------------------------------------------------------------*/ |
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/* Finalization mix - force all bits of a hash block to avalanche */ |
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static uint32_t fmix32 ( 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 uint64_t fmix64 ( uint64_t k ) |
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{ |
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k ^= k >> 33; |
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k *= BIG_CONSTANT(0xff51afd7ed558ccd); |
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k ^= k >> 33; |
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k *= BIG_CONSTANT(0xc4ceb9fe1a85ec53); |
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k ^= k >> 33; |
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return k; |
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} |
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/*------------------------------------------------------------------*/ |
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void MurmurHash3_x86_32 ( const void * key, int len, |
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uint32_t seed, void * 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 *)(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 = fmix32(h1); |
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*(uint32_t*)out = h1; |
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} |
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/*------------------------------------------------------------------*/ |
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void MurmurHash3_x86_128 ( const void * key, const int len, |
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uint32_t seed, void * 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 / 16; |
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int i; |
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uint32_t h1 = seed; |
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uint32_t h2 = seed; |
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uint32_t h3 = seed; |
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uint32_t h4 = seed; |
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uint32_t c1 = 0x239b961b; |
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uint32_t c2 = 0xab0e9789; |
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uint32_t c3 = 0x38b34ae5; |
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uint32_t c4 = 0xa1e38b93; |
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/*----------*/ |
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/* body */ |
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const uint32_t * blocks = (const uint32_t *)(data + nblocks*16); |
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for(i = -nblocks; i; i++) |
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{ |
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uint32_t k1 = getblock(blocks,i*4+0); |
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uint32_t k2 = getblock(blocks,i*4+1); |
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uint32_t k3 = getblock(blocks,i*4+2); |
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uint32_t k4 = getblock(blocks,i*4+3); |
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k1 *= c1; k1 = ROTL32(k1,15); k1 *= c2; h1 ^= k1; |
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h1 = ROTL32(h1,19); h1 += h2; h1 = h1*5+0x561ccd1b; |
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k2 *= c2; k2 = ROTL32(k2,16); k2 *= c3; h2 ^= k2; |
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h2 = ROTL32(h2,17); h2 += h3; h2 = h2*5+0x0bcaa747; |
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k3 *= c3; k3 = ROTL32(k3,17); k3 *= c4; h3 ^= k3; |
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h3 = ROTL32(h3,15); h3 += h4; h3 = h3*5+0x96cd1c35; |
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k4 *= c4; k4 = ROTL32(k4,18); k4 *= c1; h4 ^= k4; |
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h4 = ROTL32(h4,13); h4 += h1; h4 = h4*5+0x32ac3b17; |
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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*16); |
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uint32_t k1 = 0; |
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uint32_t k2 = 0; |
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uint32_t k3 = 0; |
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uint32_t k4 = 0; |
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switch(len & 15) |
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{ |
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case 15: k4 ^= tail[14] << 16; |
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case 14: k4 ^= tail[13] << 8; |
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case 13: k4 ^= tail[12] << 0; |
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k4 *= c4; k4 = ROTL32(k4,18); k4 *= c1; h4 ^= k4; |
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case 12: k3 ^= tail[11] << 24; |
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case 11: k3 ^= tail[10] << 16; |
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case 10: k3 ^= tail[ 9] << 8; |
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case 9: k3 ^= tail[ 8] << 0; |
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k3 *= c3; k3 = ROTL32(k3,17); k3 *= c4; h3 ^= k3; |
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case 8: k2 ^= tail[ 7] << 24; |
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case 7: k2 ^= tail[ 6] << 16; |
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case 6: k2 ^= tail[ 5] << 8; |
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case 5: k2 ^= tail[ 4] << 0; |
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k2 *= c2; k2 = ROTL32(k2,16); k2 *= c3; h2 ^= k2; |
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case 4: k1 ^= tail[ 3] << 24; |
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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] << 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; h2 ^= len; h3 ^= len; h4 ^= len; |
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h1 += h2; h1 += h3; h1 += h4; |
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h2 += h1; h3 += h1; h4 += h1; |
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h1 = fmix32(h1); |
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h2 = fmix32(h2); |
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h3 = fmix32(h3); |
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h4 = fmix32(h4); |
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h1 += h2; h1 += h3; h1 += h4; |
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h2 += h1; h3 += h1; h4 += h1; |
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((uint32_t*)out)[0] = h1; |
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((uint32_t*)out)[1] = h2; |
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((uint32_t*)out)[2] = h3; |
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((uint32_t*)out)[3] = h4; |
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} |
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/*------------------------------------------------------------------*/ |
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void MurmurHash3_x64_128 ( const void * key, const int len, |
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const uint32_t seed, void * 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 / 16; |
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int i; |
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uint64_t h1 = seed; |
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uint64_t h2 = seed; |
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uint64_t c1 = BIG_CONSTANT(0x87c37b91114253d5); |
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uint64_t c2 = BIG_CONSTANT(0x4cf5ad432745937f); |
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/*----------*/ |
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/* body */ |
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const uint64_t * blocks = (const uint64_t *)(data); |
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for(i = 0; i < nblocks; i++) |
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{ |
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uint64_t k1 = getblock(blocks,i*2+0); |
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uint64_t k2 = getblock(blocks,i*2+1); |
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k1 *= c1; k1 = ROTL64(k1,31); k1 *= c2; h1 ^= k1; |
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h1 = ROTL64(h1,27); h1 += h2; h1 = h1*5+0x52dce729; |
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k2 *= c2; k2 = ROTL64(k2,33); k2 *= c1; h2 ^= k2; |
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h2 = ROTL64(h2,31); h2 += h1; h2 = h2*5+0x38495ab5; |
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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*16); |
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uint64_t k1 = 0; |
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uint64_t k2 = 0; |
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switch(len & 15) |
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{ |
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case 15: k2 ^= (uint64_t)(tail[14]) << 48; |
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case 14: k2 ^= (uint64_t)(tail[13]) << 40; |
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case 13: k2 ^= (uint64_t)(tail[12]) << 32; |
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case 12: k2 ^= (uint64_t)(tail[11]) << 24; |
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case 11: k2 ^= (uint64_t)(tail[10]) << 16; |
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case 10: k2 ^= (uint64_t)(tail[ 9]) << 8; |
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case 9: k2 ^= (uint64_t)(tail[ 8]) << 0; |
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k2 *= c2; k2 = ROTL64(k2,33); k2 *= c1; h2 ^= k2; |
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case 8: k1 ^= (uint64_t)(tail[ 7]) << 56; |
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case 7: k1 ^= (uint64_t)(tail[ 6]) << 48; |
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case 6: k1 ^= (uint64_t)(tail[ 5]) << 40; |
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case 5: k1 ^= (uint64_t)(tail[ 4]) << 32; |
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case 4: k1 ^= (uint64_t)(tail[ 3]) << 24; |
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case 3: k1 ^= (uint64_t)(tail[ 2]) << 16; |
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case 2: k1 ^= (uint64_t)(tail[ 1]) << 8; |
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case 1: k1 ^= (uint64_t)(tail[ 0]) << 0; |
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k1 *= c1; k1 = ROTL64(k1,31); k1 *= c2; h1 ^= k1; |
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}; |
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/*----------*/ |
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/* finalization*/ |
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h1 ^= len; h2 ^= len; |
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h1 += h2; |
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h2 += h1; |
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h1 = fmix64(h1); |
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h2 = fmix64(h2); |
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h1 += h2; |
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h2 += h1; |
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((uint64_t*)out)[0] = h1; |
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((uint64_t*)out)[1] = h2; |
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} |
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/*------------------------------------------------------------------*/
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