1 /* 2 * The following hash function is based on MurmurHash3, placed into the public 3 * domain by Austin Appleby. See http://code.google.com/p/smhasher/ for 4 * details. 5 */ 6 /******************************************************************************/ 7 #ifdef JEMALLOC_H_TYPES 8 9 #endif /* JEMALLOC_H_TYPES */ 10 /******************************************************************************/ 11 #ifdef JEMALLOC_H_STRUCTS 12 13 #endif /* JEMALLOC_H_STRUCTS */ 14 /******************************************************************************/ 15 #ifdef JEMALLOC_H_EXTERNS 16 17 #endif /* JEMALLOC_H_EXTERNS */ 18 /******************************************************************************/ 19 #ifdef JEMALLOC_H_INLINES 20 21 #ifndef JEMALLOC_ENABLE_INLINE 22 uint32_t hash_x86_32(const void *key, int len, uint32_t seed); 23 void hash_x86_128(const void *key, const int len, uint32_t seed, 24 uint64_t r_out[2]); 25 void hash_x64_128(const void *key, const int len, const uint32_t seed, 26 uint64_t r_out[2]); 27 void hash(const void *key, size_t len, const uint32_t seed, 28 size_t r_hash[2]); 29 #endif 30 31 #if (defined(JEMALLOC_ENABLE_INLINE) || defined(JEMALLOC_HASH_C_)) 32 /******************************************************************************/ 33 /* Internal implementation. */ 34 JEMALLOC_INLINE uint32_t 35 hash_rotl_32(uint32_t x, int8_t r) 36 { 37 38 return (x << r) | (x >> (32 - r)); 39 } 40 41 JEMALLOC_INLINE uint64_t 42 hash_rotl_64(uint64_t x, int8_t r) 43 { 44 return (x << r) | (x >> (64 - r)); 45 } 46 47 JEMALLOC_INLINE uint32_t 48 hash_get_block_32(const uint32_t *p, int i) 49 { 50 51 return (p[i]); 52 } 53 54 JEMALLOC_INLINE uint64_t 55 hash_get_block_64(const uint64_t *p, int i) 56 { 57 58 return (p[i]); 59 } 60 61 JEMALLOC_INLINE uint32_t 62 hash_fmix_32(uint32_t h) 63 { 64 65 h ^= h >> 16; 66 h *= 0x85ebca6b; 67 h ^= h >> 13; 68 h *= 0xc2b2ae35; 69 h ^= h >> 16; 70 71 return (h); 72 } 73 74 JEMALLOC_INLINE uint64_t 75 hash_fmix_64(uint64_t k) 76 { 77 78 k ^= k >> 33; 79 k *= QU(0xff51afd7ed558ccdLLU); 80 k ^= k >> 33; 81 k *= QU(0xc4ceb9fe1a85ec53LLU); 82 k ^= k >> 33; 83 84 return (k); 85 } 86 87 JEMALLOC_INLINE uint32_t 88 hash_x86_32(const void *key, int len, uint32_t seed) 89 { 90 const uint8_t *data = (const uint8_t *) key; 91 const int nblocks = len / 4; 92 93 uint32_t h1 = seed; 94 95 const uint32_t c1 = 0xcc9e2d51; 96 const uint32_t c2 = 0x1b873593; 97 98 /* body */ 99 { 100 const uint32_t *blocks = (const uint32_t *) (data + nblocks*4); 101 int i; 102 103 for (i = -nblocks; i; i++) { 104 uint32_t k1 = hash_get_block_32(blocks, i); 105 106 k1 *= c1; 107 k1 = hash_rotl_32(k1, 15); 108 k1 *= c2; 109 110 h1 ^= k1; 111 h1 = hash_rotl_32(h1, 13); 112 h1 = h1*5 + 0xe6546b64; 113 } 114 } 115 116 /* tail */ 117 { 118 const uint8_t *tail = (const uint8_t *) (data + nblocks*4); 119 120 uint32_t k1 = 0; 121 122 switch (len & 3) { 123 case 3: k1 ^= tail[2] << 16; 124 case 2: k1 ^= tail[1] << 8; 125 case 1: k1 ^= tail[0]; k1 *= c1; k1 = hash_rotl_32(k1, 15); 126 k1 *= c2; h1 ^= k1; 127 } 128 } 129 130 /* finalization */ 131 h1 ^= len; 132 133 h1 = hash_fmix_32(h1); 134 135 return (h1); 136 } 137 138 UNUSED JEMALLOC_INLINE void 139 hash_x86_128(const void *key, const int len, uint32_t seed, 140 uint64_t r_out[2]) 141 { 142 const uint8_t * data = (const uint8_t *) key; 143 const int nblocks = len / 16; 144 145 uint32_t h1 = seed; 146 uint32_t h2 = seed; 147 uint32_t h3 = seed; 148 uint32_t h4 = seed; 149 150 const uint32_t c1 = 0x239b961b; 151 const uint32_t c2 = 0xab0e9789; 152 const uint32_t c3 = 0x38b34ae5; 153 const uint32_t c4 = 0xa1e38b93; 154 155 /* body */ 156 { 157 const uint32_t *blocks = (const uint32_t *) (data + nblocks*16); 158 int i; 159 160 for (i = -nblocks; i; i++) { 161 uint32_t k1 = hash_get_block_32(blocks, i*4 + 0); 162 uint32_t k2 = hash_get_block_32(blocks, i*4 + 1); 163 uint32_t k3 = hash_get_block_32(blocks, i*4 + 2); 164 uint32_t k4 = hash_get_block_32(blocks, i*4 + 3); 165 166 k1 *= c1; k1 = hash_rotl_32(k1, 15); k1 *= c2; h1 ^= k1; 167 168 h1 = hash_rotl_32(h1, 19); h1 += h2; 169 h1 = h1*5 + 0x561ccd1b; 170 171 k2 *= c2; k2 = hash_rotl_32(k2, 16); k2 *= c3; h2 ^= k2; 172 173 h2 = hash_rotl_32(h2, 17); h2 += h3; 174 h2 = h2*5 + 0x0bcaa747; 175 176 k3 *= c3; k3 = hash_rotl_32(k3, 17); k3 *= c4; h3 ^= k3; 177 178 h3 = hash_rotl_32(h3, 15); h3 += h4; 179 h3 = h3*5 + 0x96cd1c35; 180 181 k4 *= c4; k4 = hash_rotl_32(k4, 18); k4 *= c1; h4 ^= k4; 182 183 h4 = hash_rotl_32(h4, 13); h4 += h1; 184 h4 = h4*5 + 0x32ac3b17; 185 } 186 } 187 188 /* tail */ 189 { 190 const uint8_t *tail = (const uint8_t *) (data + nblocks*16); 191 uint32_t k1 = 0; 192 uint32_t k2 = 0; 193 uint32_t k3 = 0; 194 uint32_t k4 = 0; 195 196 switch (len & 15) { 197 case 15: k4 ^= tail[14] << 16; 198 case 14: k4 ^= tail[13] << 8; 199 case 13: k4 ^= tail[12] << 0; 200 k4 *= c4; k4 = hash_rotl_32(k4, 18); k4 *= c1; h4 ^= k4; 201 202 case 12: k3 ^= tail[11] << 24; 203 case 11: k3 ^= tail[10] << 16; 204 case 10: k3 ^= tail[ 9] << 8; 205 case 9: k3 ^= tail[ 8] << 0; 206 k3 *= c3; k3 = hash_rotl_32(k3, 17); k3 *= c4; h3 ^= k3; 207 208 case 8: k2 ^= tail[ 7] << 24; 209 case 7: k2 ^= tail[ 6] << 16; 210 case 6: k2 ^= tail[ 5] << 8; 211 case 5: k2 ^= tail[ 4] << 0; 212 k2 *= c2; k2 = hash_rotl_32(k2, 16); k2 *= c3; h2 ^= k2; 213 214 case 4: k1 ^= tail[ 3] << 24; 215 case 3: k1 ^= tail[ 2] << 16; 216 case 2: k1 ^= tail[ 1] << 8; 217 case 1: k1 ^= tail[ 0] << 0; 218 k1 *= c1; k1 = hash_rotl_32(k1, 15); k1 *= c2; h1 ^= k1; 219 } 220 } 221 222 /* finalization */ 223 h1 ^= len; h2 ^= len; h3 ^= len; h4 ^= len; 224 225 h1 += h2; h1 += h3; h1 += h4; 226 h2 += h1; h3 += h1; h4 += h1; 227 228 h1 = hash_fmix_32(h1); 229 h2 = hash_fmix_32(h2); 230 h3 = hash_fmix_32(h3); 231 h4 = hash_fmix_32(h4); 232 233 h1 += h2; h1 += h3; h1 += h4; 234 h2 += h1; h3 += h1; h4 += h1; 235 236 r_out[0] = (((uint64_t) h2) << 32) | h1; 237 r_out[1] = (((uint64_t) h4) << 32) | h3; 238 } 239 240 UNUSED JEMALLOC_INLINE void 241 hash_x64_128(const void *key, const int len, const uint32_t seed, 242 uint64_t r_out[2]) 243 { 244 const uint8_t *data = (const uint8_t *) key; 245 const int nblocks = len / 16; 246 247 uint64_t h1 = seed; 248 uint64_t h2 = seed; 249 250 const uint64_t c1 = QU(0x87c37b91114253d5LLU); 251 const uint64_t c2 = QU(0x4cf5ad432745937fLLU); 252 253 /* body */ 254 { 255 const uint64_t *blocks = (const uint64_t *) (data); 256 int i; 257 258 for (i = 0; i < nblocks; i++) { 259 uint64_t k1 = hash_get_block_64(blocks, i*2 + 0); 260 uint64_t k2 = hash_get_block_64(blocks, i*2 + 1); 261 262 k1 *= c1; k1 = hash_rotl_64(k1, 31); k1 *= c2; h1 ^= k1; 263 264 h1 = hash_rotl_64(h1, 27); h1 += h2; 265 h1 = h1*5 + 0x52dce729; 266 267 k2 *= c2; k2 = hash_rotl_64(k2, 33); k2 *= c1; h2 ^= k2; 268 269 h2 = hash_rotl_64(h2, 31); h2 += h1; 270 h2 = h2*5 + 0x38495ab5; 271 } 272 } 273 274 /* tail */ 275 { 276 const uint8_t *tail = (const uint8_t*)(data + nblocks*16); 277 uint64_t k1 = 0; 278 uint64_t k2 = 0; 279 280 switch (len & 15) { 281 case 15: k2 ^= ((uint64_t)(tail[14])) << 48; 282 case 14: k2 ^= ((uint64_t)(tail[13])) << 40; 283 case 13: k2 ^= ((uint64_t)(tail[12])) << 32; 284 case 12: k2 ^= ((uint64_t)(tail[11])) << 24; 285 case 11: k2 ^= ((uint64_t)(tail[10])) << 16; 286 case 10: k2 ^= ((uint64_t)(tail[ 9])) << 8; 287 case 9: k2 ^= ((uint64_t)(tail[ 8])) << 0; 288 k2 *= c2; k2 = hash_rotl_64(k2, 33); k2 *= c1; h2 ^= k2; 289 290 case 8: k1 ^= ((uint64_t)(tail[ 7])) << 56; 291 case 7: k1 ^= ((uint64_t)(tail[ 6])) << 48; 292 case 6: k1 ^= ((uint64_t)(tail[ 5])) << 40; 293 case 5: k1 ^= ((uint64_t)(tail[ 4])) << 32; 294 case 4: k1 ^= ((uint64_t)(tail[ 3])) << 24; 295 case 3: k1 ^= ((uint64_t)(tail[ 2])) << 16; 296 case 2: k1 ^= ((uint64_t)(tail[ 1])) << 8; 297 case 1: k1 ^= ((uint64_t)(tail[ 0])) << 0; 298 k1 *= c1; k1 = hash_rotl_64(k1, 31); k1 *= c2; h1 ^= k1; 299 } 300 } 301 302 /* finalization */ 303 h1 ^= len; h2 ^= len; 304 305 h1 += h2; 306 h2 += h1; 307 308 h1 = hash_fmix_64(h1); 309 h2 = hash_fmix_64(h2); 310 311 h1 += h2; 312 h2 += h1; 313 314 r_out[0] = h1; 315 r_out[1] = h2; 316 } 317 318 /******************************************************************************/ 319 /* API. */ 320 JEMALLOC_INLINE void 321 hash(const void *key, size_t len, const uint32_t seed, size_t r_hash[2]) 322 { 323 #if (LG_SIZEOF_PTR == 3) 324 hash_x64_128(key, len, seed, (uint64_t *)r_hash); 325 #else 326 uint64_t hashes[2]; 327 hash_x86_128(key, len, seed, hashes); 328 r_hash[0] = (size_t)hashes[0]; 329 r_hash[1] = (size_t)hashes[1]; 330 #endif 331 } 332 #endif 333 334 #endif /* JEMALLOC_H_INLINES */ 335 /******************************************************************************/ 336