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 45 return ((x << r) | (x >> (64 - r))); 46 } 47 48 JEMALLOC_INLINE uint32_t 49 hash_get_block_32(const uint32_t *p, int i) 50 { 51 52 return (p[i]); 53 } 54 55 JEMALLOC_INLINE uint64_t 56 hash_get_block_64(const uint64_t *p, int i) 57 { 58 59 return (p[i]); 60 } 61 62 JEMALLOC_INLINE uint32_t 63 hash_fmix_32(uint32_t h) 64 { 65 66 h ^= h >> 16; 67 h *= 0x85ebca6b; 68 h ^= h >> 13; 69 h *= 0xc2b2ae35; 70 h ^= h >> 16; 71 72 return (h); 73 } 74 75 JEMALLOC_INLINE uint64_t 76 hash_fmix_64(uint64_t k) 77 { 78 79 k ^= k >> 33; 80 k *= KQU(0xff51afd7ed558ccd); 81 k ^= k >> 33; 82 k *= KQU(0xc4ceb9fe1a85ec53); 83 k ^= k >> 33; 84 85 return (k); 86 } 87 88 JEMALLOC_INLINE uint32_t 89 hash_x86_32(const void *key, int len, uint32_t seed) 90 { 91 const uint8_t *data = (const uint8_t *) key; 92 const int nblocks = len / 4; 93 94 uint32_t h1 = seed; 95 96 const uint32_t c1 = 0xcc9e2d51; 97 const uint32_t c2 = 0x1b873593; 98 99 /* body */ 100 { 101 const uint32_t *blocks = (const uint32_t *) (data + nblocks*4); 102 int i; 103 104 for (i = -nblocks; i; i++) { 105 uint32_t k1 = hash_get_block_32(blocks, i); 106 107 k1 *= c1; 108 k1 = hash_rotl_32(k1, 15); 109 k1 *= c2; 110 111 h1 ^= k1; 112 h1 = hash_rotl_32(h1, 13); 113 h1 = h1*5 + 0xe6546b64; 114 } 115 } 116 117 /* tail */ 118 { 119 const uint8_t *tail = (const uint8_t *) (data + nblocks*4); 120 121 uint32_t k1 = 0; 122 123 switch (len & 3) { 124 case 3: k1 ^= tail[2] << 16; 125 case 2: k1 ^= tail[1] << 8; 126 case 1: k1 ^= tail[0]; k1 *= c1; k1 = hash_rotl_32(k1, 15); 127 k1 *= c2; h1 ^= k1; 128 } 129 } 130 131 /* finalization */ 132 h1 ^= len; 133 134 h1 = hash_fmix_32(h1); 135 136 return (h1); 137 } 138 139 UNUSED JEMALLOC_INLINE void 140 hash_x86_128(const void *key, const int len, uint32_t seed, 141 uint64_t r_out[2]) 142 { 143 const uint8_t * data = (const uint8_t *) key; 144 const int nblocks = len / 16; 145 146 uint32_t h1 = seed; 147 uint32_t h2 = seed; 148 uint32_t h3 = seed; 149 uint32_t h4 = seed; 150 151 const uint32_t c1 = 0x239b961b; 152 const uint32_t c2 = 0xab0e9789; 153 const uint32_t c3 = 0x38b34ae5; 154 const uint32_t c4 = 0xa1e38b93; 155 156 /* body */ 157 { 158 const uint32_t *blocks = (const uint32_t *) (data + nblocks*16); 159 int i; 160 161 for (i = -nblocks; i; i++) { 162 uint32_t k1 = hash_get_block_32(blocks, i*4 + 0); 163 uint32_t k2 = hash_get_block_32(blocks, i*4 + 1); 164 uint32_t k3 = hash_get_block_32(blocks, i*4 + 2); 165 uint32_t k4 = hash_get_block_32(blocks, i*4 + 3); 166 167 k1 *= c1; k1 = hash_rotl_32(k1, 15); k1 *= c2; h1 ^= k1; 168 169 h1 = hash_rotl_32(h1, 19); h1 += h2; 170 h1 = h1*5 + 0x561ccd1b; 171 172 k2 *= c2; k2 = hash_rotl_32(k2, 16); k2 *= c3; h2 ^= k2; 173 174 h2 = hash_rotl_32(h2, 17); h2 += h3; 175 h2 = h2*5 + 0x0bcaa747; 176 177 k3 *= c3; k3 = hash_rotl_32(k3, 17); k3 *= c4; h3 ^= k3; 178 179 h3 = hash_rotl_32(h3, 15); h3 += h4; 180 h3 = h3*5 + 0x96cd1c35; 181 182 k4 *= c4; k4 = hash_rotl_32(k4, 18); k4 *= c1; h4 ^= k4; 183 184 h4 = hash_rotl_32(h4, 13); h4 += h1; 185 h4 = h4*5 + 0x32ac3b17; 186 } 187 } 188 189 /* tail */ 190 { 191 const uint8_t *tail = (const uint8_t *) (data + nblocks*16); 192 uint32_t k1 = 0; 193 uint32_t k2 = 0; 194 uint32_t k3 = 0; 195 uint32_t k4 = 0; 196 197 switch (len & 15) { 198 case 15: k4 ^= tail[14] << 16; 199 case 14: k4 ^= tail[13] << 8; 200 case 13: k4 ^= tail[12] << 0; 201 k4 *= c4; k4 = hash_rotl_32(k4, 18); k4 *= c1; h4 ^= k4; 202 203 case 12: k3 ^= tail[11] << 24; 204 case 11: k3 ^= tail[10] << 16; 205 case 10: k3 ^= tail[ 9] << 8; 206 case 9: k3 ^= tail[ 8] << 0; 207 k3 *= c3; k3 = hash_rotl_32(k3, 17); k3 *= c4; h3 ^= k3; 208 209 case 8: k2 ^= tail[ 7] << 24; 210 case 7: k2 ^= tail[ 6] << 16; 211 case 6: k2 ^= tail[ 5] << 8; 212 case 5: k2 ^= tail[ 4] << 0; 213 k2 *= c2; k2 = hash_rotl_32(k2, 16); k2 *= c3; h2 ^= k2; 214 215 case 4: k1 ^= tail[ 3] << 24; 216 case 3: k1 ^= tail[ 2] << 16; 217 case 2: k1 ^= tail[ 1] << 8; 218 case 1: k1 ^= tail[ 0] << 0; 219 k1 *= c1; k1 = hash_rotl_32(k1, 15); k1 *= c2; h1 ^= k1; 220 } 221 } 222 223 /* finalization */ 224 h1 ^= len; h2 ^= len; h3 ^= len; h4 ^= len; 225 226 h1 += h2; h1 += h3; h1 += h4; 227 h2 += h1; h3 += h1; h4 += h1; 228 229 h1 = hash_fmix_32(h1); 230 h2 = hash_fmix_32(h2); 231 h3 = hash_fmix_32(h3); 232 h4 = hash_fmix_32(h4); 233 234 h1 += h2; h1 += h3; h1 += h4; 235 h2 += h1; h3 += h1; h4 += h1; 236 237 r_out[0] = (((uint64_t) h2) << 32) | h1; 238 r_out[1] = (((uint64_t) h4) << 32) | h3; 239 } 240 241 UNUSED JEMALLOC_INLINE void 242 hash_x64_128(const void *key, const int len, const uint32_t seed, 243 uint64_t r_out[2]) 244 { 245 const uint8_t *data = (const uint8_t *) key; 246 const int nblocks = len / 16; 247 248 uint64_t h1 = seed; 249 uint64_t h2 = seed; 250 251 const uint64_t c1 = KQU(0x87c37b91114253d5); 252 const uint64_t c2 = KQU(0x4cf5ad432745937f); 253 254 /* body */ 255 { 256 const uint64_t *blocks = (const uint64_t *) (data); 257 int i; 258 259 for (i = 0; i < nblocks; i++) { 260 uint64_t k1 = hash_get_block_64(blocks, i*2 + 0); 261 uint64_t k2 = hash_get_block_64(blocks, i*2 + 1); 262 263 k1 *= c1; k1 = hash_rotl_64(k1, 31); k1 *= c2; h1 ^= k1; 264 265 h1 = hash_rotl_64(h1, 27); h1 += h2; 266 h1 = h1*5 + 0x52dce729; 267 268 k2 *= c2; k2 = hash_rotl_64(k2, 33); k2 *= c1; h2 ^= k2; 269 270 h2 = hash_rotl_64(h2, 31); h2 += h1; 271 h2 = h2*5 + 0x38495ab5; 272 } 273 } 274 275 /* tail */ 276 { 277 const uint8_t *tail = (const uint8_t*)(data + nblocks*16); 278 uint64_t k1 = 0; 279 uint64_t k2 = 0; 280 281 switch (len & 15) { 282 case 15: k2 ^= ((uint64_t)(tail[14])) << 48; 283 case 14: k2 ^= ((uint64_t)(tail[13])) << 40; 284 case 13: k2 ^= ((uint64_t)(tail[12])) << 32; 285 case 12: k2 ^= ((uint64_t)(tail[11])) << 24; 286 case 11: k2 ^= ((uint64_t)(tail[10])) << 16; 287 case 10: k2 ^= ((uint64_t)(tail[ 9])) << 8; 288 case 9: k2 ^= ((uint64_t)(tail[ 8])) << 0; 289 k2 *= c2; k2 = hash_rotl_64(k2, 33); k2 *= c1; h2 ^= k2; 290 291 case 8: k1 ^= ((uint64_t)(tail[ 7])) << 56; 292 case 7: k1 ^= ((uint64_t)(tail[ 6])) << 48; 293 case 6: k1 ^= ((uint64_t)(tail[ 5])) << 40; 294 case 5: k1 ^= ((uint64_t)(tail[ 4])) << 32; 295 case 4: k1 ^= ((uint64_t)(tail[ 3])) << 24; 296 case 3: k1 ^= ((uint64_t)(tail[ 2])) << 16; 297 case 2: k1 ^= ((uint64_t)(tail[ 1])) << 8; 298 case 1: k1 ^= ((uint64_t)(tail[ 0])) << 0; 299 k1 *= c1; k1 = hash_rotl_64(k1, 31); k1 *= c2; h1 ^= k1; 300 } 301 } 302 303 /* finalization */ 304 h1 ^= len; h2 ^= len; 305 306 h1 += h2; 307 h2 += h1; 308 309 h1 = hash_fmix_64(h1); 310 h2 = hash_fmix_64(h2); 311 312 h1 += h2; 313 h2 += h1; 314 315 r_out[0] = h1; 316 r_out[1] = h2; 317 } 318 319 /******************************************************************************/ 320 /* API. */ 321 JEMALLOC_INLINE void 322 hash(const void *key, size_t len, const uint32_t seed, size_t r_hash[2]) 323 { 324 #if (LG_SIZEOF_PTR == 3 && !defined(JEMALLOC_BIG_ENDIAN)) 325 hash_x64_128(key, len, seed, (uint64_t *)r_hash); 326 #else 327 uint64_t hashes[2]; 328 hash_x86_128(key, len, seed, hashes); 329 r_hash[0] = (size_t)hashes[0]; 330 r_hash[1] = (size_t)hashes[1]; 331 #endif 332 } 333 #endif 334 335 #endif /* JEMALLOC_H_INLINES */ 336 /******************************************************************************/ 337