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wyhash: update to final_version_3 (part 1) (#9451)

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ka-weihe 2021-03-24 16:57:38 +01:00 committed by GitHub
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vlib/v/gen/c/cheaders.v
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@ -345,10 +345,23 @@ void _vcleanup();
#define _ARR_LEN(a) ( (sizeof(a)) / (sizeof(a[0])) ) #define _ARR_LEN(a) ( (sizeof(a)) / (sizeof(a[0])) )
// ============== wyhash ============== // ============== wyhash ==============
//Author: Wang Yi #ifndef wyhash_final_version_3
#ifndef wyhash_version_gamma #define wyhash_final_version_3
#define wyhash_version_gamma
#define WYHASH_CONDOM 0 #ifndef WYHASH_CONDOM
//protections that produce different results:
//1: normal valid behavior
//2: extra protection against entropy loss (probability=2^-63), aka. "blind multiplication"
#define WYHASH_CONDOM 1
#endif
#ifndef WYHASH_32BIT_MUM
//0: normal version, slow on 32 bit systems
//1: faster on 32 bit systems but produces different results, incompatible with wy2u0k function
#define WYHASH_32BIT_MUM 0
#endif
//includes
#include <stdint.h> #include <stdint.h>
#include <string.h> #include <string.h>
#if defined(_MSC_VER) && defined(_M_X64) #if defined(_MSC_VER) && defined(_M_X64)
@ -356,101 +369,162 @@ void _vcleanup();
#pragma intrinsic(_umul128) #pragma intrinsic(_umul128)
#endif #endif
//const uint64_t _wyp0=0xa0761d6478bd642full, _wyp1=0xe7037ed1a0b428dbull; //likely and unlikely macros
#define _wyp0 ((uint64_t)0xa0761d6478bd642full) #if defined(__GNUC__) || defined(__INTEL_COMPILER) || defined(__clang__)
#define _wyp1 ((uint64_t)0xe7037ed1a0b428dbull)
#if defined(__GNUC__) || defined(__INTEL_COMPILER) || defined(__clang__) || defined(__TINYC__)
#define _likely_(x) __builtin_expect(x,1) #define _likely_(x) __builtin_expect(x,1)
#define _unlikely_(x) __builtin_expect((x), 0) #define _unlikely_(x) __builtin_expect(x,0)
#else #else
#define _likely_(x) (x) #define _likely_(x) (x)
#define _unlikely_(x) (x) #define _unlikely_(x) (x)
#endif #endif
#if defined(TARGET_ORDER_IS_LITTLE) //128bit multiply function
#define WYHASH_LITTLE_ENDIAN 1 static inline uint64_t _wyrot(uint64_t x) { return (x>>32)|(x<<32); }
#elif defined(TARGET_ORDER_IS_BIG) static inline void _wymum(uint64_t *A, uint64_t *B){
#define WYHASH_LITTLE_ENDIAN 0 #if(WYHASH_32BIT_MUM)
#endif uint64_t hh=(*A>>32)*(*B>>32), hl=(*A>>32)*(uint32_t)*B, lh=(uint32_t)*A*(*B>>32), ll=(uint64_t)(uint32_t)*A*(uint32_t)*B;
#if(WYHASH_CONDOM>1)
#if (WYHASH_LITTLE_ENDIAN) *A^=_wyrot(hl)^hh; *B^=_wyrot(lh)^ll;
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;}
#else #else
#if defined(__GNUC__) || defined(__INTEL_COMPILER) || defined(__clang__) *A=_wyrot(hl)^hh; *B=_wyrot(lh)^ll;
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);}
#elif defined(__TINYC__)
static inline uint64_t _wyr8(const uint8_t *p) { uint64_t v; memcpy(&v, p, 8); return bswap_64(v);}
static inline uint64_t _wyr4(const uint8_t *p) { unsigned v; memcpy(&v, p, 4); return bswap_32(v);}
#endif #endif
#endif #elif defined(__SIZEOF_INT128__)
__uint128_t r=*A; r*=*B;
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];} #if(WYHASH_CONDOM>1)
static inline uint64_t _wyrotr(uint64_t v, unsigned k) { return (v >> k) | (v << (64 - k));} *A^=(uint64_t)r; *B^=(uint64_t)(r>>64);
static inline void _wymix128(uint64_t A, uint64_t B, uint64_t *C, uint64_t *D){
A^=*C; B^=*D;
#ifdef UNOFFICIAL_WYHASH_32BIT
uint64_t hh=(A>>32)*(B>>32), hl=(A>>32)*(unsigned)B, lh=(unsigned)A*(B>>32), ll=(uint64_t)(unsigned)A*(unsigned)B;
*C=_wyrotr(hl,32)^hh; *D=_wyrotr(lh,32)^ll;
#else #else
#ifdef __SIZEOF_INT128__ *A=(uint64_t)r; *B=(uint64_t)(r>>64);
__uint128_t r=A; r*=B; *C=(uint64_t)r; *D=(uint64_t)(r>>64); #endif
#elif defined(_MSC_VER) && defined(_M_X64) #elif defined(_MSC_VER) && defined(_M_X64)
A=_umul128(A,B,&B); *C=A; *D=B; #if(WYHASH_CONDOM>1)
uint64_t a, b;
a=_umul128(*A,*B,&b);
*A^=a; *B^=b;
#else #else
uint64_t ha=A>>32, hb=B>>32, la=(uint32_t)A, lb=(uint32_t)B, hi, lo; *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; 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; lo=t+(rm1<<32); c+=lo<t; hi=rh+(rm0>>32)+(rm1>>32)+c;
*C=lo; *D=hi; #if(WYHASH_CONDOM>1)
#endif *A^=lo; *B^=hi;
#endif
}
static inline uint64_t wyhash(const void *key, uint64_t len, uint64_t seed){
const uint8_t *p=(const uint8_t *)key;
uint64_t i=len, see1=seed;
start:
if (_likely_(i<=16)) {
#ifndef WYHASH_CONDOM
uint64_t shift = (i<8)*((8-i)<<3);
//WARNING: intended reading outside buffer, trading for speed.
_wymix128((_wyr8(p)<<shift)^_wyp0, (_wyr8(p+i-8)>>shift)^_wyp1, &seed, &see1);
#else #else
if (_likely_(i<=8)) { *A=lo; *B=hi;
if (_likely_(i>=4)) _wymix128(_wyr4(p)^_wyp0,_wyr4(p+i-4)^_wyp1, &seed, &see1); #endif
else if (_likely_(i)) _wymix128(_wyr3(p,i)^_wyp0,_wyp1, &seed, &see1);
else _wymix128(_wyp0,_wyp1, &seed, &see1);
}
else _wymix128(_wyr8(p)^_wyp0,_wyr8(p+i-8)^_wyp1, &seed, &see1);
#endif #endif
_wymix128(len,_wyp0, &seed, &see1);
return seed^see1;
} }
_wymix128(_wyr8(p)^_wyp0,_wyr8(p+8)^_wyp1, &seed, &see1);
i-=16; p+=16; goto start; //multiply and xor mix function, aka MUM
static inline uint64_t _wymix(uint64_t A, uint64_t B){ _wymum(&A,&B); return A^B; }
//endian macros
#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
#else
#warning could not determine endianness! Falling back to little endian.
#define WYHASH_LITTLE_ENDIAN 1
#endif
#endif
//read functions
#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) { uint32_t 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) { uint32_t 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) { uint32_t v; memcpy(&v, p, 4); return _byteswap_ulong(v);}
#else
static inline uint64_t _wyr8(const uint8_t *p) {
uint64_t v; memcpy(&v, p, 8);
return (((v >> 56) & 0xff)| ((v >> 40) & 0xff00)| ((v >> 24) & 0xff0000)| ((v >> 8) & 0xff000000)| ((v << 8) & 0xff00000000)| ((v << 24) & 0xff0000000000)| ((v << 40) & 0xff000000000000)| ((v << 56) & 0xff00000000000000));
} }
static inline uint64_t wyhash64(uint64_t A, uint64_t B){ static inline uint64_t _wyr4(const uint8_t *p) {
_wymix128(_wyp0,_wyp1,&A,&B); uint32_t v; memcpy(&v, p, 4);
_wymix128(0,0,&A,&B); return (((v >> 24) & 0xff)| ((v >> 8) & 0xff00)| ((v << 8) & 0xff0000)| ((v << 24) & 0xff000000));
return A^B;
} }
static inline uint64_t wyrand(uint64_t *seed){ #endif
*seed+=_wyp0; static inline uint64_t _wyr3(const uint8_t *p, size_t k) { return (((uint64_t)p[0])<<16)|(((uint64_t)p[k>>1])<<8)|p[k-1];}
uint64_t a=0, b=0;
_wymix128(*seed,*seed^_wyp1,&a,&b); //wyhash main function
return a^b; static inline uint64_t wyhash(const void *key, size_t len, uint64_t seed, const uint64_t *secret){
const uint8_t *p=(const uint8_t *)key; seed^=*secret; uint64_t a, b;
if(_likely_(len<=16)){
if(_likely_(len>=4)){ a=(_wyr4(p)<<32)|_wyr4(p+((len>>3)<<2)); b=(_wyr4(p+len-4)<<32)|_wyr4(p+len-4-((len>>3)<<2)); }
else if(_likely_(len>0)){ a=_wyr3(p,len); b=0;}
else a=b=0;
} }
static inline double wy2u01(uint64_t r) { else{
const double _wynorm=1.0/(1ull<<52); size_t i=len;
return (r>>12)*_wynorm; if(_unlikely_(i>48)){
uint64_t see1=seed, see2=seed;
do{
seed=_wymix(_wyr8(p)^secret[1],_wyr8(p+8)^seed);
see1=_wymix(_wyr8(p+16)^secret[2],_wyr8(p+24)^see1);
see2=_wymix(_wyr8(p+32)^secret[3],_wyr8(p+40)^see2);
p+=48; i-=48;
}while(_likely_(i>48));
seed^=see1^see2;
}
while(_unlikely_(i>16)){ seed=_wymix(_wyr8(p)^secret[1],_wyr8(p+8)^seed); i-=16; p+=16; }
a=_wyr8(p+i-16); b=_wyr8(p+i-8);
}
return _wymix(secret[1]^len,_wymix(a^secret[1],b^seed));
}
//the default secret parameters
static const uint64_t _wyp[4] = {0xa0761d6478bd642full, 0xe7037ed1a0b428dbull, 0x8ebc6af09c88c6e3ull, 0x589965cc75374cc3ull};
//a useful 64bit-64bit mix function to produce deterministic pseudo random numbers that can pass BigCrush and PractRand
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]);}
//The wyrand PRNG that pass BigCrush and PractRand
static inline uint64_t wyrand(uint64_t *seed){ *seed+=_wyp[0]; return _wymix(*seed,*seed^_wyp[1]);}
//convert any 64 bit pseudo random numbers to uniform distribution [0,1). It can be combined with wyrand, wyhash64 or wyhash.
static inline double wy2u01(uint64_t r){ const double _wynorm=1.0/(1ull<<52); return (r>>12)*_wynorm;}
//convert any 64 bit pseudo random numbers to APPROXIMATE Gaussian distribution. It can be combined with wyrand, wyhash64 or wyhash.
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;}
#if(!WYHASH_32BIT_MUM)
//fast range integer random number generation on [0,k) credit to Daniel Lemire. May not work when WYHASH_32BIT_MUM=1. It can be combined with wyrand, wyhash64 or wyhash.
static inline uint64_t wy2u0k(uint64_t r, uint64_t k){ _wymum(&r,&k); return k; }
#endif
//make your own secret
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<4;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; }
#else
//manual popcount
uint64_t x = secret[j]^secret[i];
x -= (x >> 1) & 0x5555555555555555;
x = (x & 0x3333333333333333) + ((x >> 2) & 0x3333333333333333);
x = (x + (x >> 4)) & 0x0f0f0f0f0f0f0f0f;
x = (x * 0x0101010101010101) >> 56;
if(x!=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);
} }
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;
} }
#endif #endif