/* Copyright 2020 王一 Wang Yi This is free and unencumbered software released into the public domain. http://unlicense.org/ See github.com/wangyi-fudan/wyhash/ LICENSE */ #ifndef wyhash_final_version #define wyhash_final_version //defines that change behavior #ifndef WYHASH_CONDOM #define WYHASH_CONDOM 1 //0: read 8 bytes before and after boundaries, dangerous but fastest. 1: normal valid behavior 2: extra protection against entropy loss (probability=2^-63), aka. "blind multiplication" #endif #define WYHASH_32BIT_MUM 0 //faster on 32 bit system //includes #include #include #if defined(_MSC_VER) && defined(_M_X64) #include #pragma intrinsic(_umul128) #endif #if defined(__GNUC__) || defined(__INTEL_COMPILER) || defined(__clang__) #define _likely_(x) __builtin_expect(x,1) #define _unlikely_(x) __builtin_expect(x,0) #else #define _likely_(x) (x) #define _unlikely_(x) (x) #endif //mum function static inline uint64_t _wyrot(uint64_t x) { return (x>>32)|(x<<32); } static inline void _wymum(uint64_t *A, uint64_t *B){ #if(WYHASH_32BIT_MUM) uint64_t hh=(*A>>32)*(*B>>32), hl=(*A>>32)*(unsigned)*B, lh=(unsigned)*A*(*B>>32), ll=(uint64_t)(unsigned)*A*(unsigned)*B; #if(WYHASH_CONDOM>1) *A^=_wyrot(hl)^hh; *B^=_wyrot(lh)^ll; #else *A=_wyrot(hl)^hh; *B=_wyrot(lh)^ll; #endif #elif defined(__SIZEOF_INT128__) __uint128_t r=*A; r*=*B; #if(WYHASH_CONDOM>1) *A^=(uint64_t)r; *B^=(uint64_t)(r>>64); #else *A=(uint64_t)r; *B=(uint64_t)(r>>64); #endif #elif defined(_MSC_VER) && defined(_M_X64) #if(WYHASH_CONDOM>1) uint64_t a, b; a=_umul128(*A,*B,&b); *A^=a; *B^=b; #else *A=_umul128(*A,*B,B); #endif #else uint64_t ha=*A>>32, hb=*B>>32, la=(uint32_t)*A, lb=(uint32_t)*B, hi, lo; uint64_t rh=ha*hb, rm0=ha*lb, rm1=hb*la, rl=la*lb, t=rl+(rm0<<32), c=t>32)+(rm1>>32)+c; #if(WYHASH_CONDOM>1) *A^=lo; *B^=hi; #else *A=lo; *B=hi; #endif #endif } static inline uint64_t _wymix(uint64_t A, uint64_t B){ _wymum(&A,&B); return A^B; } //read functions #ifndef WYHASH_LITTLE_ENDIAN #if defined(_WIN32) || defined(__LITTLE_ENDIAN__) || (defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) #define WYHASH_LITTLE_ENDIAN 1 #elif defined(__BIG_ENDIAN__) || (defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) #define WYHASH_LITTLE_ENDIAN 0 #endif #endif #if (WYHASH_LITTLE_ENDIAN) static inline uint64_t _wyr8(const uint8_t *p) { uint64_t v; memcpy(&v, p, 8); return v;} static inline uint64_t _wyr4(const uint8_t *p) { unsigned v; memcpy(&v, p, 4); return v;} #elif defined(__GNUC__) || defined(__INTEL_COMPILER) || defined(__clang__) static inline uint64_t _wyr8(const uint8_t *p) { uint64_t v; memcpy(&v, p, 8); return __builtin_bswap64(v);} static inline uint64_t _wyr4(const uint8_t *p) { unsigned v; memcpy(&v, p, 4); return __builtin_bswap32(v);} #elif defined(_MSC_VER) static inline uint64_t _wyr8(const uint8_t *p) { uint64_t v; memcpy(&v, p, 8); return _byteswap_uint64(v);} static inline uint64_t _wyr4(const uint8_t *p) { unsigned v; memcpy(&v, p, 4); return _byteswap_ulong(v);} #endif static inline uint64_t _wyr3(const uint8_t *p, unsigned k) { return (((uint64_t)p[0])<<16)|(((uint64_t)p[k>>1])<<8)|p[k-1];} //wyhash function static inline uint64_t _wyfinish16(const uint8_t *p, uint64_t len, uint64_t seed, const uint64_t *secret, uint64_t i){ #if(WYHASH_CONDOM>0) uint64_t a, b; if(_likely_(i<=8)){ if(_likely_(i>=4)){ a=_wyr4(p); b=_wyr4(p+i-4); } else if (_likely_(i)){ a=_wyr3(p,i); b=0; } else a=b=0; } else{ a=_wyr8(p); b=_wyr8(p+i-8); } return _wymix(secret[1]^len,_wymix(a^secret[1], b^seed)); #else #define oneshot_shift ((i<8)*((8-i)<<3)) return _wymix(secret[1]^len,_wymix((_wyr8(p)<>oneshot_shift)^seed)); #endif } static inline uint64_t _wyfinish(const uint8_t *p, uint64_t len, uint64_t seed, const uint64_t *secret, uint64_t i){ if(_likely_(i<=16)) return _wyfinish16(p,len,seed,secret,i); return _wyfinish(p+16,len,_wymix(_wyr8(p)^secret[1],_wyr8(p+8)^seed),secret,i-16); } static inline uint64_t wyhash(const void *key, uint64_t len, uint64_t seed, const uint64_t *secret){ const uint8_t *p=(const uint8_t *)key; uint64_t i=len; seed^=*secret; if(_unlikely_(i>64)){ uint64_t see1=seed; do{ seed=_wymix(_wyr8(p)^secret[1],_wyr8(p+8)^seed)^_wymix(_wyr8(p+16)^secret[2],_wyr8(p+24)^seed); see1=_wymix(_wyr8(p+32)^secret[3],_wyr8(p+40)^see1)^_wymix(_wyr8(p+48)^secret[4],_wyr8(p+56)^see1); p+=64; i-=64; }while(i>64); seed^=see1; } return _wyfinish(p,len,seed,secret,i); } //utility functions const uint64_t _wyp[5] = {0xa0761d6478bd642full, 0xe7037ed1a0b428dbull, 0x8ebc6af09c88c6e3ull, 0x589965cc75374cc3ull, 0x1d8e4e27c47d124full}; static inline uint64_t wyhash64(uint64_t A, uint64_t B){ A^=_wyp[0]; B^=_wyp[1]; _wymum(&A,&B); return _wymix(A^_wyp[0],B^_wyp[1]);} static inline uint64_t wyrand(uint64_t *seed){ *seed+=_wyp[0]; return _wymix(*seed,*seed^_wyp[1]);} static inline double wy2u01(uint64_t r){ const double _wynorm=1.0/(1ull<<52); return (r>>12)*_wynorm;} static inline double wy2gau(uint64_t r){ const double _wynorm=1.0/(1ull<<20); return ((r&0x1fffff)+((r>>21)&0x1fffff)+((r>>42)&0x1fffff))*_wynorm-3.0;} static inline uint64_t wy2u0k(uint64_t r, uint64_t k){ _wymum(&r,&k); return k; } static inline void make_secret(uint64_t seed, uint64_t *secret){ uint8_t c[] = {15, 23, 27, 29, 30, 39, 43, 45, 46, 51, 53, 54, 57, 58, 60, 71, 75, 77, 78, 83, 85, 86, 89, 90, 92, 99, 101, 102, 105, 106, 108, 113, 114, 116, 120, 135, 139, 141, 142, 147, 149, 150, 153, 154, 156, 163, 165, 166, 169, 170, 172, 177, 178, 180, 184, 195, 197, 198, 201, 202, 204, 209, 210, 212, 216, 225, 226, 228, 232, 240 }; for(size_t i=0;i<5;i++){ uint8_t ok; do{ ok=1; secret[i]=0; for(size_t j=0;j<64;j+=8) secret[i]|=((uint64_t)c[wyrand(&seed)%sizeof(c)])<