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//-----------------------------------------------------------------------------
// MurmurHash3 was written by Austin Appleby, and is placed in the public
// domain. The author hereby disclaims copyright to this source code.
// Note - The x86 and x64 versions do _not_ produce the same results, as the
// algorithms are optimized for their respective platforms. You can still
// compile and run any of them on any platform, but your performance with the
// non-native version will be less than optimal.
/*
* This version is taken from https://github.com/PeterScott/murmur3
* and modified to work with CUDA.
*/
#include <stdint.h>
//-----------------------------------------------------------------------------
// Platform-specific functions and macros
#define FORCE_INLINE
__device__ static inline FORCE_INLINE uint64_t rotl64 ( uint64_t x, int8_t r )
{
return (x << r) | (x >> (64 - r));
}
#define ROTL64(x,y) rotl64(x,y)
#define BIG_CONSTANT(x) (x##LLU)
//-----------------------------------------------------------------------------
// Block read - if your platform needs to do endian-swapping or can only
// handle aligned reads, do the conversion here
#define getblock(p, i) (p[i])
//-----------------------------------------------------------------------------
// Finalization mix - force all bits of a hash block to avalanche
__device__ static inline FORCE_INLINE uint32_t fmix32 ( uint32_t h )
{
h ^= h >> 16;
h *= 0x85ebca6b;
h ^= h >> 13;
h *= 0xc2b2ae35;
h ^= h >> 16;
return h;
}
//----------
__device__ static inline FORCE_INLINE uint64_t fmix64 ( uint64_t k )
{
k ^= k >> 33;
k *= BIG_CONSTANT(0xff51afd7ed558ccd);
k ^= k >> 33;
k *= BIG_CONSTANT(0xc4ceb9fe1a85ec53);
k ^= k >> 33;
return k;
}
//-----------------------------------------------------------------------------
__device__ 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;
int i;
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(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 = fmix64(h1);
h2 = fmix64(h2);
h1 += h2;
h2 += h1;
((uint64_t*)out)[0] = h1;
((uint64_t*)out)[1] = h2;
}
//-----------------------------------------------------------------------------
// Write a stream of hash values for an input stream. Each output may have up to 128 bits
// of entropy. Input size should be specified in bytes.
__global__ void
hash_data(char* dest,
const char* src, size_t out_size, size_t in_size, size_t n_items, uint32_t seed)
{
int i = (blockIdx.x * blockDim.x + threadIdx.x);
if (i >= n_items) return;
src += i * in_size;
dest += i * out_size;
char entropy[16]; // 128/8=16
MurmurHash3_x64_128(src, in_size, seed, entropy);
for (int i=0; i < out_size; ++i)
dest[i] = entropy[i];
}
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