Murmur Hash 例子

摘自murmur-hash php扩展实现，稍作整理留加备用。。

#define        FORCE_INLINE __attribute__((always_inline))inline uint32_t rotl32 ( uint32_t x, int8_t r ){  return (x << r) | (x >> (32 - r));}inline uint64_t rotl64 ( uint64_t x, int8_t r ){  return (x << r) | (x >> (64 - r));}#define        ROTL32(x,y)        rotl32(x,y)#define ROTL64(x,y)        rotl64(x,y)#define BIG_CONSTANT(x) (x##LLU)FORCE_INLINE uint32_t getblock ( const uint32_t * p, int i ){  return p[i];}FORCE_INLINE uint64_t getblock ( const uint64_t * p, int i ){  return p[i];}//-----------------------------------------------------------------------------// Finalization mix - force all bits of a hash block to avalancheFORCE_INLINE uint32_t fmix ( uint32_t h ){  h ^= h >> 16;  h *= 0x85ebca6b;  h ^= h >> 13;  h *= 0xc2b2ae35;  h ^= h >> 16;  return h;}//----------FORCE_INLINE uint64_t fmix ( uint64_t k ){  k ^= k >> 33;  k *= BIG_CONSTANT(0xff51afd7ed558ccd);  k ^= k >> 33;  k *= BIG_CONSTANT(0xc4ceb9fe1a85ec53);  k ^= k >> 33;  return k;}

void MurmurHash3_x86_32 ( const void * key, int len,                          uint32_t seed, void * out ){  const uint8_t * data = (const uint8_t*)key;  const int nblocks = len / 4;  uint32_t h1 = seed;  uint32_t c1 = 0xcc9e2d51;  uint32_t c2 = 0x1b873593;  //----------  // body  const uint32_t * blocks = (const uint32_t *)(data + nblocks*4);  for(int i = -nblocks; i; i++)  {    uint32_t k1 = getblock(blocks,i);    k1 *= c1;    k1 = ROTL32(k1,15);    k1 *= c2;        h1 ^= k1;    h1 = ROTL32(h1,13);     h1 = h1*5+0xe6546b64;  }  //----------  // tail  const uint8_t * tail = (const uint8_t*)(data + nblocks*4);  uint32_t k1 = 0;  switch(len & 3)  {  case 3: k1 ^= tail[2] << 16;  case 2: k1 ^= tail[1] << 8;  case 1: k1 ^= tail[0];          k1 *= c1; k1 = ROTL32(k1,15); k1 *= c2; h1 ^= k1;  };  //----------  // finalization  h1 ^= len;  h1 = fmix(h1);  *(uint32_t*)out = h1;} //-----------------------------------------------------------------------------void MurmurHash3_x86_128 ( const void * key, const int len,                           uint32_t seed, void * out ){  const uint8_t * data = (const uint8_t*)key;  const int nblocks = len / 16;  uint32_t h1 = seed;  uint32_t h2 = seed;  uint32_t h3 = seed;  uint32_t h4 = seed;  uint32_t c1 = 0x239b961b;   uint32_t c2 = 0xab0e9789;  uint32_t c3 = 0x38b34ae5;   uint32_t c4 = 0xa1e38b93;  //----------  // body  const uint32_t * blocks = (const uint32_t *)(data + nblocks*16);  for(int i = -nblocks; i; i++)  {    uint32_t k1 = getblock(blocks,i*4+0);    uint32_t k2 = getblock(blocks,i*4+1);    uint32_t k3 = getblock(blocks,i*4+2);    uint32_t k4 = getblock(blocks,i*4+3);    k1 *= c1; k1  = ROTL32(k1,15); k1 *= c2; h1 ^= k1;    h1 = ROTL32(h1,19); h1 += h2; h1 = h1*5+0x561ccd1b;    k2 *= c2; k2  = ROTL32(k2,16); k2 *= c3; h2 ^= k2;    h2 = ROTL32(h2,17); h2 += h3; h2 = h2*5+0x0bcaa747;    k3 *= c3; k3  = ROTL32(k3,17); k3 *= c4; h3 ^= k3;    h3 = ROTL32(h3,15); h3 += h4; h3 = h3*5+0x96cd1c35;    k4 *= c4; k4  = ROTL32(k4,18); k4 *= c1; h4 ^= k4;    h4 = ROTL32(h4,13); h4 += h1; h4 = h4*5+0x32ac3b17;  }  //----------  // tail  const uint8_t * tail = (const uint8_t*)(data + nblocks*16);  uint32_t k1 = 0;  uint32_t k2 = 0;  uint32_t k3 = 0;  uint32_t k4 = 0;  switch(len & 15)  {  case 15: k4 ^= tail[14] << 16;  case 14: k4 ^= tail[13] << 8;  case 13: k4 ^= tail[12] << 0;           k4 *= c4; k4  = ROTL32(k4,18); k4 *= c1; h4 ^= k4;  case 12: k3 ^= tail[11] << 24;  case 11: k3 ^= tail[10] << 16;  case 10: k3 ^= tail[ 9] << 8;  case  9: k3 ^= tail[ 8] << 0;           k3 *= c3; k3  = ROTL32(k3,17); k3 *= c4; h3 ^= k3;  case  8: k2 ^= tail[ 7] << 24;  case  7: k2 ^= tail[ 6] << 16;  case  6: k2 ^= tail[ 5] << 8;  case  5: k2 ^= tail[ 4] << 0;           k2 *= c2; k2  = ROTL32(k2,16); k2 *= c3; h2 ^= k2;  case  4: k1 ^= tail[ 3] << 24;  case  3: k1 ^= tail[ 2] << 16;  case  2: k1 ^= tail[ 1] << 8;  case  1: k1 ^= tail[ 0] << 0;           k1 *= c1; k1  = ROTL32(k1,15); k1 *= c2; h1 ^= k1;  };  //----------  // finalization  h1 ^= len; h2 ^= len; h3 ^= len; h4 ^= len;  h1 += h2; h1 += h3; h1 += h4;  h2 += h1; h3 += h1; h4 += h1;  h1 = fmix(h1);  h2 = fmix(h2);  h3 = fmix(h3);  h4 = fmix(h4);  h1 += h2; h1 += h3; h1 += h4;  h2 += h1; h3 += h1; h4 += h1;  ((uint32_t*)out)[0] = h1;  ((uint32_t*)out)[1] = h2;  ((uint32_t*)out)[2] = h3;  ((uint32_t*)out)[3] = h4;}//-----------------------------------------------------------------------------void MurmurHash3_x64_128 ( const void * key, const int len,                           const uint32_t seed, void * out ){  const uint8_t * data = (const uint8_t*)key;  const int nblocks = len / 16;  uint64_t h1 = seed;  uint64_t h2 = seed;  uint64_t c1 = BIG_CONSTANT(0x87c37b91114253d5);  uint64_t c2 = BIG_CONSTANT(0x4cf5ad432745937f);  //----------  // body  const uint64_t * blocks = (const uint64_t *)(data);  for(int i = 0; i < nblocks; i++)  {    uint64_t k1 = getblock(blocks,i*2+0);    uint64_t k2 = getblock(blocks,i*2+1);    k1 *= c1; k1  = ROTL64(k1,31); k1 *= c2; h1 ^= k1;    h1 = ROTL64(h1,27); h1 += h2; h1 = h1*5+0x52dce729;    k2 *= c2; k2  = ROTL64(k2,33); k2 *= c1; h2 ^= k2;    h2 = ROTL64(h2,31); h2 += h1; h2 = h2*5+0x38495ab5;  }  //----------  // tail  const uint8_t * tail = (const uint8_t*)(data + nblocks*16);  uint64_t k1 = 0;  uint64_t k2 = 0;  switch(len & 15)  {  case 15: k2 ^= uint64_t(tail[14]) << 48;  case 14: k2 ^= uint64_t(tail[13]) << 40;  case 13: k2 ^= uint64_t(tail[12]) << 32;  case 12: k2 ^= uint64_t(tail[11]) << 24;  case 11: k2 ^= uint64_t(tail[10]) << 16;  case 10: k2 ^= uint64_t(tail[ 9]) << 8;  case  9: k2 ^= uint64_t(tail[ 8]) << 0;           k2 *= c2; k2  = ROTL64(k2,33); k2 *= c1; h2 ^= k2;  case  8: k1 ^= uint64_t(tail[ 7]) << 56;  case  7: k1 ^= uint64_t(tail[ 6]) << 48;  case  6: k1 ^= uint64_t(tail[ 5]) << 40;  case  5: k1 ^= uint64_t(tail[ 4]) << 32;  case  4: k1 ^= uint64_t(tail[ 3]) << 24;  case  3: k1 ^= uint64_t(tail[ 2]) << 16;  case  2: k1 ^= uint64_t(tail[ 1]) << 8;  case  1: k1 ^= uint64_t(tail[ 0]) << 0;           k1 *= c1; k1  = ROTL64(k1,31); k1 *= c2; h1 ^= k1;  };  //----------  // finalization  h1 ^= len; h2 ^= len;  h1 += h2;  h2 += h1;  h1 = fmix(h1);  h2 = fmix(h2);  h1 += h2;  h2 += h1;  ((uint64_t*)out)[0] = h1;  ((uint64_t*)out)[1] = h2;}