Subversion Repositories Games.Chess Giants

/*

  Stockfish, a UCI chess playing engine derived from Glaurung 2.1

  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)

  Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad

  Copyright (C) 2015-2019 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad

  Stockfish is free software: you can redistribute it and/or modify

  it under the terms of the GNU General Public License as published by

  the Free Software Foundation, either version 3 of the License, or

  (at your option) any later version.

  Stockfish is distributed in the hope that it will be useful,

  but WITHOUT ANY WARRANTY; without even the implied warranty of

  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License

  along with this program.  If not, see <http://www.gnu.org/licenses/>.

*/

#ifndef MISC_H_INCLUDED

#define MISC_H_INCLUDED

#include <cassert>

#include <chrono>

#include <ostream>

#include <string>

#include <vector>

#include "types.h"

const std::string engine_info(bool to_uci = false);

void prefetch(void* addr);

void prefetch2(void* addr);

void start_logger(const std::string& fname);

void dbg_hit_on(bool b);

void dbg_hit_on(bool c, bool b);

void dbg_mean_of(int v);

void dbg_print();

typedef std::chrono::milliseconds::rep TimePoint; // A value in milliseconds

static_assert(sizeof(TimePoint) == sizeof(int64_t), "TimePoint should be 64 bits");

inline TimePoint now() {

  return std::chrono::duration_cast<std::chrono::milliseconds>

        (std::chrono::steady_clock::now().time_since_epoch()).count();

}

template<class Entry, int Size>

struct HashTable {

  Entry* operator[](Key key) { return &table[(uint32_t)key & (Size - 1)]; }

private:

  std::vector<Entry> table = std::vector<Entry>(Size);

};

enum SyncCout { IO_LOCK, IO_UNLOCK };

std::ostream& operator<<(std::ostream&, SyncCout);

#define sync_cout std::cout << IO_LOCK

#define sync_endl std::endl << IO_UNLOCK

/// xorshift64star Pseudo-Random Number Generator

/// This class is based on original code written and dedicated

/// to the public domain by Sebastiano Vigna (2014).

/// It has the following characteristics:

///

///  -  Outputs 64-bit numbers

///  -  Passes Dieharder and SmallCrush test batteries

///  -  Does not require warm-up, no zeroland to escape

///  -  Internal state is a single 64-bit integer

///  -  Period is 2^64 - 1

///  -  Speed: 1.60 ns/call (Core i7 @3.40GHz)

///

/// For further analysis see

///   <http://vigna.di.unimi.it/ftp/papers/xorshift.pdf>

class PRNG {

  uint64_t s;

  uint64_t rand64() {

    s ^= s >> 12, s ^= s << 25, s ^= s >> 27;

    return s * 2685821657736338717LL;

  }

public:

  PRNG(uint64_t seed) : s(seed) { assert(seed); }

  template<typename T> T rand() { return T(rand64()); }

  /// Special generator used to fast init magic numbers.

  /// Output values only have 1/8th of their bits set on average.

  template<typename T> T sparse_rand()

  { return T(rand64() & rand64() & rand64()); }

};

/// Under Windows it is not possible for a process to run on more than one

/// logical processor group. This usually means to be limited to use max 64

/// cores. To overcome this, some special platform specific API should be

/// called to set group affinity for each thread. Original code from Texel by

/// Peter Österlund.

namespace WinProcGroup {

  void bindThisThread(size_t idx);

}

#endif // #ifndef MISC_H_INCLUDED