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
6 Stockfish is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
11 Stockfish is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
20 #ifndef MISC_H_INCLUDED
21 #define MISC_H_INCLUDED
31 const std::string engine_info(bool to_uci = false);
32 void prefetch(void* addr);
33 void start_logger(bool b);
35 void dbg_hit_on(bool b);
36 void dbg_hit_on(bool c, bool b);
37 void dbg_mean_of(int v);
40 typedef std::chrono::milliseconds::rep TimePoint; // A value in milliseconds
42 inline TimePoint now() {
43 return std::chrono::duration_cast<std::chrono::milliseconds>
44 (std::chrono::steady_clock::now().time_since_epoch()).count();
47 template<class Entry, int Size>
49 Entry* operator[](Key key) { return &table[(uint32_t)key & (Size - 1)]; }
52 std::vector<Entry> table = std::vector<Entry>(Size);
56 enum SyncCout { IO_LOCK, IO_UNLOCK };
57 std::ostream& operator<<(std::ostream&, SyncCout);
59 #define sync_cout std::cout << IO_LOCK
60 #define sync_endl std::endl << IO_UNLOCK
63 /// xorshift64star Pseudo-Random Number Generator
64 /// This class is based on original code written and dedicated
65 /// to the public domain by Sebastiano Vigna (2014).
66 /// It has the following characteristics:
68 /// - Outputs 64-bit numbers
69 /// - Passes Dieharder and SmallCrush test batteries
70 /// - Does not require warm-up, no zeroland to escape
71 /// - Internal state is a single 64-bit integer
72 /// - Period is 2^64 - 1
73 /// - Speed: 1.60 ns/call (Core i7 @3.40GHz)
75 /// For further analysis see
76 /// <http://vigna.di.unimi.it/ftp/papers/xorshift.pdf>
84 s ^= s >> 12, s ^= s << 25, s ^= s >> 27;
85 return s * 2685821657736338717LL;
89 PRNG(uint64_t seed) : s(seed) { assert(seed); }
91 template<typename T> T rand() { return T(rand64()); }
93 /// Special generator used to fast init magic numbers.
94 /// Output values only have 1/8th of their bits set on average.
95 template<typename T> T sparse_rand()
96 { return T(rand64() & rand64() & rand64()); }
99 #endif // #ifndef MISC_H_INCLUDED