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//Author: Wang Yi <godspeed_china@yeah.net>
#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 boudaries, 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 <stdint.h>
#include <string.h>
#if defined(_MSC_VER) && defined(_M_X64)
#include <intrin.h>
#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<rl; lo=t+(rm1<<32); c+=lo<t; hi=rh+(rm0>>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)^secret[1],(_wyr8(p+i-8)>>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 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)])<<j; if(secret[i]%2==0){ ok=0; continue; } for(size_t j=0;j<i;j++)#if defined(__GNUC__) || defined(__INTEL_COMPILER) || defined(__clang__)
if(__builtin_popcountll(secret[j]^secret[i])!=32){ ok=0; break; }#elif defined(_MSC_VER) && defined(_M_X64)
if(_mm_popcnt_u64(secret[j]^secret[i])!=32){ ok=0; break; }#endif
if(!ok)continue; for(uint64_t j=3;j<0x100000000ull;j+=2) if(secret[i]%j==0){ ok=0; break; } }while(!ok); }}#endif
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