// cast to unsigned for logical right bitshift (to match C* MM3 implementation)

k ^= ((uint64_t) k) >> 33;

k *= BIG_CONSTANT(0xff51afd7ed558ccd);

k ^= ((uint64_t) k) >> 33;

k *= BIG_CONSTANT(0xc4ceb9fe1a85ec53);

k ^= ((uint64_t) k) >> 33;

return k;

const uint32_t seed)

{

const int8_t * data = (const int8_t*)key;

const int nblocks = len / 16;

int64_t h1 = seed;

int64_t h2 = seed;

int64_t c1 = BIG_CONSTANT(0x87c37b91114253d5);

int64_t c2 = BIG_CONSTANT(0x4cf5ad432745937f);

int64_t k1 = 0;

int64_t k2 = 0;

const int64_t * blocks = (const int64_t *)(data);

const int8_t * tail = (const int8_t*)(data + nblocks*16);

//----------

// body

int i;

for (i = 0; i < nblocks; i++)

{

int64_t k1 = getblock(blocks,i*2+0);

int64_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

switch (len & 15)

{

case 15: k2 ^= ((int64_t) (tail[14])) << 48; /* FALLTHRU */

case 14: k2 ^= ((int64_t) (tail[13])) << 40; /* FALLTHRU */

case 13: k2 ^= ((int64_t) (tail[12])) << 32; /* FALLTHRU */

case 12: k2 ^= ((int64_t) (tail[11])) << 24; /* FALLTHRU */

case 11: k2 ^= ((int64_t) (tail[10])) << 16; /* FALLTHRU */

case 10: k2 ^= ((int64_t) (tail[ 9])) << 8; /* FALLTHRU */

case 9: k2 ^= ((int64_t) (tail[ 8])) << 0;

k2 *= c2; k2 = ROTL64(k2,33); k2 *= c1; h2 ^= k2; /* FALLTHRU */

case 8: k1 ^= ((int64_t) (tail[ 7])) << 56; /* FALLTHRU */

case 7: k1 ^= ((int64_t) (tail[ 6])) << 48; /* FALLTHRU */

case 6: k1 ^= ((int64_t) (tail[ 5])) << 40; /* FALLTHRU */

case 5: k1 ^= ((int64_t) (tail[ 4])) << 32; /* FALLTHRU */

case 4: k1 ^= ((int64_t) (tail[ 3])) << 24; /* FALLTHRU */

case 3: k1 ^= ((int64_t) (tail[ 2])) << 16; /* FALLTHRU */

case 2: k1 ^= ((int64_t) (tail[ 1])) << 8; /* FALLTHRU */

case 1: k1 ^= ((int64_t) (tail[ 0])) << 0;

k1 *= c1; k1 = ROTL64(k1,31); k1 *= c2; h1 ^= k1; /* FALLTHRU */

};

//----------

// finalization

h1 ^= len; h2 ^= len;

h1 += h2;

h2 += h1;

h1 = fmix(h1);

h2 = fmix(h2);

h1 += h2;

h2 += h1;

return h1;