mirror of
https://github.com/trapexit/mergerfs.git
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Update wyhash to final4
This commit is contained in:
Antonio SJ Musumeci
parent
3a1d8e03a1
commit
fdecabfaab
@ -3,6 +3,7 @@
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### included in repo
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* libfuse: https://github.com/libfuse/libfuse (heavily modified fork of v2.x)
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* wyhash: https://github.com/wangyi-fudan/wyhash
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* ghc::filesystem: https://github.com/gulrak/filesystem
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* nonstd::optional: https://github.com/martinmoene/optional-lite
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* fmt: https://github.com/fmtlib/fmt
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@ -19,6 +19,7 @@
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#include "errno.hpp"
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#include "fs_open.hpp"
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#include "fs_path.hpp"
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#include "rnd.hpp"
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#include <limits.h>
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@ -28,7 +29,9 @@
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#define PAD_LEN 16
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#define MAX_ATTEMPTS 3
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static char const CHARS[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
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static char const CHARS[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
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static size_t const CHARS_SIZE = (sizeof(CHARS) - 1);
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namespace l
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{
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@ -41,7 +44,7 @@ namespace l
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filename = '.';
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for(int i = 0; i < PAD_LEN; i++)
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filename += CHARS[std::rand() % (sizeof(CHARS) - 1)];
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filename += CHARS[RND::rand64(CHARS_SIZE)];
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path = base_;
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path /= filename;
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@ -14,6 +14,8 @@
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "rnd.hpp"
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#include <grp.h>
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#include <pwd.h>
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#include <stdlib.h>
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@ -81,7 +83,7 @@ GIDRecord *
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GIDCache::allocrec(void)
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{
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if(size == MAXRECS)
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return &recs[rand() % MAXRECS];
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return &recs[RND::rand64(MAXRECS)];
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else
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return &recs[size++];
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}
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@ -26,9 +26,11 @@
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static uint64_t G_SEED;
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static RND G_RND;
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RND::RND()
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__attribute__((constructor))
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static
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void
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_constructor()
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{
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struct timeval tv;
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247
src/wyhash.h
247
src/wyhash.h
@ -1,140 +1,231 @@
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//Author: Wang Yi <godspeed_china@yeah.net>
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#ifndef wyhash_final_version
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#define wyhash_final_version
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//defines that change behavior
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// This is free and unencumbered software released into the public domain under The Unlicense (http://unlicense.org/)
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// main repo: https://github.com/wangyi-fudan/wyhash
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// author: 王一 Wang Yi <godspeed_china@yeah.net>
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// contributors: Reini Urban, Dietrich Epp, Joshua Haberman, Tommy Ettinger, Daniel Lemire, Otmar Ertl, cocowalla, leo-yuriev, Diego Barrios Romero, paulie-g, dumblob, Yann Collet, ivte-ms, hyb, James Z.M. Gao, easyaspi314 (Devin), TheOneric
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/* quick example:
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string s="fjsakfdsjkf";
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uint64_t hash=wyhash(s.c_str(), s.size(), 0, _wyp);
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*/
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#ifndef wyhash_final_version_4
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#define wyhash_final_version_4
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#ifndef WYHASH_CONDOM
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#define WYHASH_CONDOM 1 //0: read 8 bytes before and after boundaries, dangerous but faster. 1: normal valid behavior 2: extra protection against entropy loss (probability=2^-63), aka. "blind multiplication"
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//protections that produce different results:
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//1: normal valid behavior
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//2: extra protection against entropy loss (probability=2^-63), aka. "blind multiplication"
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#define WYHASH_CONDOM 1
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#endif
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#define WYHASH_32BIT_MUM 0 //faster on 32 bit system
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#ifndef WYHASH_32BIT_MUM
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//0: normal version, slow on 32 bit systems
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//1: faster on 32 bit systems but produces different results, incompatible with wy2u0k function
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#define WYHASH_32BIT_MUM 0
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#endif
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//includes
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#include <stdint.h>
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#include <string.h>
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#if defined(_MSC_VER) && defined(_M_X64)
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#include <intrin.h>
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#pragma intrinsic(_umul128)
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#include <intrin.h>
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#pragma intrinsic(_umul128)
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#endif
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//likely and unlikely macros
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#if defined(__GNUC__) || defined(__INTEL_COMPILER) || defined(__clang__)
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#define _likely_(x) __builtin_expect(x,1)
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#define _unlikely_(x) __builtin_expect(x,0)
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#define _likely_(x) __builtin_expect(x,1)
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#define _unlikely_(x) __builtin_expect(x,0)
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#else
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#define _likely_(x) (x)
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#define _unlikely_(x) (x)
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#define _likely_(x) (x)
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#define _unlikely_(x) (x)
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#endif
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//mum function
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//128bit multiply function
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static inline uint64_t _wyrot(uint64_t x) { return (x>>32)|(x<<32); }
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static inline void _wymum(uint64_t *A, uint64_t *B){
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#if(WYHASH_32BIT_MUM)
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uint64_t hh=(*A>>32)*(*B>>32), hl=(*A>>32)*(unsigned)*B, lh=(unsigned)*A*(*B>>32), ll=(uint64_t)(unsigned)*A*(unsigned)*B;
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#if(WYHASH_CONDOM>1)
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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;
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#if(WYHASH_CONDOM>1)
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*A^=_wyrot(hl)^hh; *B^=_wyrot(lh)^ll;
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#else
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#else
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*A=_wyrot(hl)^hh; *B=_wyrot(lh)^ll;
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#endif
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#endif
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#elif defined(__SIZEOF_INT128__)
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__uint128_t r=*A; r*=*B;
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#if(WYHASH_CONDOM>1)
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__uint128_t r=*A; r*=*B;
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#if(WYHASH_CONDOM>1)
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*A^=(uint64_t)r; *B^=(uint64_t)(r>>64);
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#else
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#else
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*A=(uint64_t)r; *B=(uint64_t)(r>>64);
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#endif
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#endif
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#elif defined(_MSC_VER) && defined(_M_X64)
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#if(WYHASH_CONDOM>1)
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#if(WYHASH_CONDOM>1)
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uint64_t a, b;
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a=_umul128(*A,*B,&b);
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*A^=a; *B^=b;
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#else
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#else
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*A=_umul128(*A,*B,B);
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#endif
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#endif
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#else
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uint64_t ha=*A>>32, hb=*B>>32, la=(uint32_t)*A, lb=(uint32_t)*B, hi, lo;
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uint64_t rh=ha*hb, rm0=ha*lb, rm1=hb*la, rl=la*lb, t=rl+(rm0<<32), c=t<rl;
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lo=t+(rm1<<32); c+=lo<t; hi=rh+(rm0>>32)+(rm1>>32)+c;
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#if(WYHASH_CONDOM>1)
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#if(WYHASH_CONDOM>1)
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*A^=lo; *B^=hi;
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#else
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#else
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*A=lo; *B=hi;
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#endif
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#endif
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#endif
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}
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//multiply and xor mix function, aka MUM
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static inline uint64_t _wymix(uint64_t A, uint64_t B){ _wymum(&A,&B); return A^B; }
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//read functions
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//endian macros
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#ifndef WYHASH_LITTLE_ENDIAN
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#if defined(_WIN32) || defined(__LITTLE_ENDIAN__) || (defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
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#define WYHASH_LITTLE_ENDIAN 1
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#elif defined(__BIG_ENDIAN__) || (defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
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#define WYHASH_LITTLE_ENDIAN 0
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#endif
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#if defined(_WIN32) || defined(__LITTLE_ENDIAN__) || (defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
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#define WYHASH_LITTLE_ENDIAN 1
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#elif defined(__BIG_ENDIAN__) || (defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
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#define WYHASH_LITTLE_ENDIAN 0
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#else
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#warning could not determine endianness! Falling back to little endian.
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#define WYHASH_LITTLE_ENDIAN 1
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#endif
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#endif
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//read functions
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#if (WYHASH_LITTLE_ENDIAN)
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static inline uint64_t _wyr8(const uint8_t *p) { uint64_t v; memcpy(&v, p, 8); return v;}
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static inline uint64_t _wyr4(const uint8_t *p) { unsigned v; memcpy(&v, p, 4); return v;}
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static inline uint64_t _wyr4(const uint8_t *p) { uint32_t v; memcpy(&v, p, 4); return v;}
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#elif defined(__GNUC__) || defined(__INTEL_COMPILER) || defined(__clang__)
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static inline uint64_t _wyr8(const uint8_t *p) { uint64_t v; memcpy(&v, p, 8); return __builtin_bswap64(v);}
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static inline uint64_t _wyr4(const uint8_t *p) { unsigned v; memcpy(&v, p, 4); return __builtin_bswap32(v);}
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static inline uint64_t _wyr4(const uint8_t *p) { uint32_t v; memcpy(&v, p, 4); return __builtin_bswap32(v);}
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#elif defined(_MSC_VER)
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static inline uint64_t _wyr8(const uint8_t *p) { uint64_t v; memcpy(&v, p, 8); return _byteswap_uint64(v);}
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static inline uint64_t _wyr4(const uint8_t *p) { unsigned v; memcpy(&v, p, 4); return _byteswap_ulong(v);}
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static inline uint64_t _wyr4(const uint8_t *p) { uint32_t v; memcpy(&v, p, 4); return _byteswap_ulong(v);}
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#else
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static inline uint64_t _wyr8(const uint8_t *p) {
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uint64_t v; memcpy(&v, p, 8);
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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));
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}
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static inline uint64_t _wyr4(const uint8_t *p) {
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uint32_t v; memcpy(&v, p, 4);
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return (((v >> 24) & 0xff)| ((v >> 8) & 0xff00)| ((v << 8) & 0xff0000)| ((v << 24) & 0xff000000));
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}
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#endif
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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];}
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//wyhash function
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static inline uint64_t _wyfinish16(const uint8_t *p, uint64_t len, uint64_t seed, const uint64_t *secret, uint64_t i){
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#if(WYHASH_CONDOM>0)
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uint64_t a, b;
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if(_likely_(i<=8)){
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if(_likely_(i>=4)){ a=_wyr4(p); b=_wyr4(p+i-4); }
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else if (_likely_(i)){ a=_wyr3(p,i); b=0; }
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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];}
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//wyhash main function
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static inline uint64_t wyhash(const void *key, size_t len, uint64_t seed, const uint64_t *secret){
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const uint8_t *p=(const uint8_t *)key; seed^=_wymix(seed^secret[0],secret[1]); uint64_t a, b;
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if(_likely_(len<=16)){
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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)); }
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else if(_likely_(len>0)){ a=_wyr3(p,len); b=0;}
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else a=b=0;
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}
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else{ a=_wyr8(p); b=_wyr8(p+i-8); }
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return _wymix(secret[1]^len,_wymix(a^secret[1], b^seed));
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#else
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#define oneshot_shift ((i<8)*((8-i)<<3))
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return _wymix(secret[1]^len,_wymix((_wyr8(p)<<oneshot_shift)^secret[1],(_wyr8(p+i-8)>>oneshot_shift)^seed));
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#endif
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}
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static inline uint64_t _wyfinish(const uint8_t *p, uint64_t len, uint64_t seed, const uint64_t *secret, uint64_t i){
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if(_likely_(i<=16)) return _wyfinish16(p,len,seed,secret,i);
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return _wyfinish(p+16,len,_wymix(_wyr8(p)^secret[1],_wyr8(p+8)^seed),secret,i-16);
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}
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static inline uint64_t wyhash(const void *key, uint64_t len, uint64_t seed, const uint64_t *secret){
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const uint8_t *p=(const uint8_t *)key;
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uint64_t i=len; seed^=*secret;
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if(_unlikely_(i>64)){
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uint64_t see1=seed;
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do{
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seed=_wymix(_wyr8(p)^secret[1],_wyr8(p+8)^seed)^_wymix(_wyr8(p+16)^secret[2],_wyr8(p+24)^seed);
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see1=_wymix(_wyr8(p+32)^secret[3],_wyr8(p+40)^see1)^_wymix(_wyr8(p+48)^secret[4],_wyr8(p+56)^see1);
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p+=64; i-=64;
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}while(i>64);
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seed^=see1;
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else{
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size_t i=len;
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if(_unlikely_(i>48)){
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uint64_t see1=seed, see2=seed;
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do{
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seed=_wymix(_wyr8(p)^secret[1],_wyr8(p+8)^seed);
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see1=_wymix(_wyr8(p+16)^secret[2],_wyr8(p+24)^see1);
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see2=_wymix(_wyr8(p+32)^secret[3],_wyr8(p+40)^see2);
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p+=48; i-=48;
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}while(_likely_(i>48));
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seed^=see1^see2;
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}
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while(_unlikely_(i>16)){ seed=_wymix(_wyr8(p)^secret[1],_wyr8(p+8)^seed); i-=16; p+=16; }
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a=_wyr8(p+i-16); b=_wyr8(p+i-8);
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}
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return _wyfinish(p,len,seed,secret,i);
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a^=secret[1]; b^=seed; _wymum(&a,&b);
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return _wymix(a^secret[0]^len,b^secret[1]);
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}
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//utility functions
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const uint64_t _wyp[5] = {0xa0761d6478bd642full, 0xe7037ed1a0b428dbull, 0x8ebc6af09c88c6e3ull, 0x589965cc75374cc3ull, 0x1d8e4e27c47d124full};
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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]);}
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static inline uint64_t wyrand(uint64_t *seed){ *seed+=_wyp[0]; return _wymix(*seed,*seed^_wyp[1]);}
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//the default secret parameters
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static const uint64_t _wyp[4] = {0xa0761d6478bd642full, 0xe7037ed1a0b428dbull, 0x8ebc6af09c88c6e3ull, 0x589965cc75374cc3ull};
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//a useful 64bit-64bit mix function to produce deterministic pseudo random numbers that can pass BigCrush and PractRand
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static inline uint64_t wyhash64(uint64_t A, uint64_t B){ A^=0xa0761d6478bd642full; B^=0xe7037ed1a0b428dbull; _wymum(&A,&B); return _wymix(A^0xa0761d6478bd642full,B^0xe7037ed1a0b428dbull);}
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//The wyrand PRNG that pass BigCrush and PractRand
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static inline uint64_t wyrand(uint64_t *seed){ *seed+=0xa0761d6478bd642full; return _wymix(*seed,*seed^0xe7037ed1a0b428dbull);}
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//convert any 64 bit pseudo random numbers to uniform distribution [0,1). It can be combined with wyrand, wyhash64 or wyhash.
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static inline double wy2u01(uint64_t r){ const double _wynorm=1.0/(1ull<<52); return (r>>12)*_wynorm;}
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//convert any 64 bit pseudo random numbers to APPROXIMATE Gaussian distribution. It can be combined with wyrand, wyhash64 or wyhash.
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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;}
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#ifdef WYTRNG
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#include <sys/time.h>
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//The wytrand true random number generator, passed BigCrush.
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static inline uint64_t wytrand(uint64_t *seed){
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struct timeval t; gettimeofday(&t,0);
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uint64_t teed=(((uint64_t)t.tv_sec)<<32)|t.tv_usec;
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teed=_wymix(teed^_wyp[0],*seed^_wyp[1]);
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*seed=_wymix(teed^_wyp[0],_wyp[2]);
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return _wymix(*seed,*seed^_wyp[3]);
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}
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#endif
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#if(!WYHASH_32BIT_MUM)
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//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.
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static inline uint64_t wy2u0k(uint64_t r, uint64_t k){ _wymum(&r,&k); return k; }
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#endif
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//make your own secret
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static inline void make_secret(uint64_t seed, uint64_t *secret){
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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 };
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for(size_t i=0;i<5;i++){
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for(size_t i=0;i<4;i++){
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uint8_t ok;
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do{
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ok=1; secret[i]=0;
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||||
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++)
|
||||
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; }
|
||||
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);
|
||||
}
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
/* The Unlicense
|
||||
This is free and unencumbered software released into the public domain.
|
||||
|
||||
Anyone is free to copy, modify, publish, use, compile, sell, or
|
||||
distribute this software, either in source code form or as a compiled
|
||||
binary, for any purpose, commercial or non-commercial, and by any
|
||||
means.
|
||||
|
||||
In jurisdictions that recognize copyright laws, the author or authors
|
||||
of this software dedicate any and all copyright interest in the
|
||||
software to the public domain. We make this dedication for the benefit
|
||||
of the public at large and to the detriment of our heirs and
|
||||
successors. We intend this dedication to be an overt act of
|
||||
relinquishment in perpetuity of all present and future rights to this
|
||||
software under copyright law.
|
||||
|
||||
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
||||
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
||||
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
|
||||
IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
|
||||
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
|
||||
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
|
||||
OTHER DEALINGS IN THE SOFTWARE.
|
||||
|
||||
For more information, please refer to <http://unlicense.org/>
|
||||
*/
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user