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) 2015-2019 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
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.
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.
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/>.
21 #ifndef MISC_H_INCLUDED
22 #define MISC_H_INCLUDED
32 const std::string engine_info(bool to_uci = false);
33 void prefetch(void* addr);
34 void prefetch2(void* addr);
35 void start_logger(const std::string& fname);
37 void dbg_hit_on(bool b);
38 void dbg_hit_on(bool c, bool b);
39 void dbg_mean_of(int v);
42 typedef std::chrono::milliseconds::rep TimePoint; // A value in milliseconds
44 static_assert(sizeof(TimePoint) == sizeof(int64_t), "TimePoint should be 64 bits");
46 inline TimePoint now() {
47 return std::chrono::duration_cast<std::chrono::milliseconds>
48 (std::chrono::steady_clock::now().time_since_epoch()).count();
51 template<class Entry, int Size>
53 Entry* operator[](Key key) { return &table[(uint32_t)key & (Size - 1)]; }
56 std::vector<Entry> table = std::vector<Entry>(Size); // Allocate on the heap
60 enum SyncCout { IO_LOCK, IO_UNLOCK };
61 std::ostream& operator<<(std::ostream&, SyncCout);
63 #define sync_cout std::cout << IO_LOCK
64 #define sync_endl std::endl << IO_UNLOCK
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:
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)
79 /// For further analysis see
80 /// <http://vigna.di.unimi.it/ftp/papers/xorshift.pdf>
88 s ^= s >> 12, s ^= s << 25, s ^= s >> 27;
89 return s * 2685821657736338717LL;
93 PRNG(uint64_t seed) : s(seed) { assert(seed); }
95 template<typename T> T rand() { return T(rand64()); }
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()); }
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.
110 namespace WinProcGroup {
111 void bindThisThread(size_t idx);
114 #endif // #ifndef MISC_H_INCLUDED