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Member "stockfish-11-linux/src/misc.h" (18 Jan 2020, 3516 Bytes) of package /linux/privat/stockfish-11-linux.zip:


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    1 /*
    2   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
    3   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
    4   Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad
    5   Copyright (C) 2015-2020 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
    6 
    7   Stockfish is free software: you can redistribute it and/or modify
    8   it under the terms of the GNU General Public License as published by
    9   the Free Software Foundation, either version 3 of the License, or
   10   (at your option) any later version.
   11 
   12   Stockfish is distributed in the hope that it will be useful,
   13   but WITHOUT ANY WARRANTY; without even the implied warranty of
   14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   15   GNU General Public License for more details.
   16 
   17   You should have received a copy of the GNU General Public License
   18   along with this program.  If not, see <http://www.gnu.org/licenses/>.
   19 */
   20 
   21 #ifndef MISC_H_INCLUDED
   22 #define MISC_H_INCLUDED
   23 
   24 #include <cassert>
   25 #include <chrono>
   26 #include <ostream>
   27 #include <string>
   28 #include <vector>
   29 
   30 #include "types.h"
   31 
   32 const std::string engine_info(bool to_uci = false);
   33 const std::string compiler_info();
   34 void prefetch(void* addr);
   35 void start_logger(const std::string& fname);
   36 
   37 void dbg_hit_on(bool b);
   38 void dbg_hit_on(bool c, bool b);
   39 void dbg_mean_of(int v);
   40 void dbg_print();
   41 
   42 typedef std::chrono::milliseconds::rep TimePoint; // A value in milliseconds
   43 
   44 static_assert(sizeof(TimePoint) == sizeof(int64_t), "TimePoint should be 64 bits");
   45 
   46 inline TimePoint now() {
   47   return std::chrono::duration_cast<std::chrono::milliseconds>
   48         (std::chrono::steady_clock::now().time_since_epoch()).count();
   49 }
   50 
   51 template<class Entry, int Size>
   52 struct HashTable {
   53   Entry* operator[](Key key) { return &table[(uint32_t)key & (Size - 1)]; }
   54 
   55 private:
   56   std::vector<Entry> table = std::vector<Entry>(Size); // Allocate on the heap
   57 };
   58 
   59 
   60 enum SyncCout { IO_LOCK, IO_UNLOCK };
   61 std::ostream& operator<<(std::ostream&, SyncCout);
   62 
   63 #define sync_cout std::cout << IO_LOCK
   64 #define sync_endl std::endl << IO_UNLOCK
   65 
   66 
   67 /// xorshift64star Pseudo-Random Number Generator
   68 /// This class is based on original code written and dedicated
   69 /// to the public domain by Sebastiano Vigna (2014).
   70 /// It has the following characteristics:
   71 ///
   72 ///  -  Outputs 64-bit numbers
   73 ///  -  Passes Dieharder and SmallCrush test batteries
   74 ///  -  Does not require warm-up, no zeroland to escape
   75 ///  -  Internal state is a single 64-bit integer
   76 ///  -  Period is 2^64 - 1
   77 ///  -  Speed: 1.60 ns/call (Core i7 @3.40GHz)
   78 ///
   79 /// For further analysis see
   80 ///   <http://vigna.di.unimi.it/ftp/papers/xorshift.pdf>
   81 
   82 class PRNG {
   83 
   84   uint64_t s;
   85 
   86   uint64_t rand64() {
   87 
   88     s ^= s >> 12, s ^= s << 25, s ^= s >> 27;
   89     return s * 2685821657736338717LL;
   90   }
   91 
   92 public:
   93   PRNG(uint64_t seed) : s(seed) { assert(seed); }
   94 
   95   template<typename T> T rand() { return T(rand64()); }
   96 
   97   /// Special generator used to fast init magic numbers.
   98   /// Output values only have 1/8th of their bits set on average.
   99   template<typename T> T sparse_rand()
  100   { return T(rand64() & rand64() & rand64()); }
  101 };
  102 
  103 
  104 /// Under Windows it is not possible for a process to run on more than one
  105 /// logical processor group. This usually means to be limited to use max 64
  106 /// cores. To overcome this, some special platform specific API should be
  107 /// called to set group affinity for each thread. Original code from Texel by
  108 /// Peter Ă–sterlund.
  109 
  110 namespace WinProcGroup {
  111   void bindThisThread(size_t idx);
  112 }
  113 
  114 #endif // #ifndef MISC_H_INCLUDED