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a03e98dcd3
This is a patch to fix issue #1498, switching the time management variables to 64 bits to avoid overflow of time variables after 25 days. There was a bug in Stockfish 9 causing the output to be wrong after 2^31 milliseconds search. Here is a long run from the starting position: info depth 64 seldepth 87 multipv 1 score cp 23 nodes 13928920239402 nps 0 tbhits 0 time -504995523 pv g1f3 d7d5 d2d4 g8f6 c2c4 d5c4 e2e3 e7e6 f1c4 c7c5 e1g1 b8c6 d4c5 d8d1 f1d1 f8c5 c4e2 e8g8 a2a3 c5e7 b2b4 f8d8 b1d2 b7b6 c1b2 c8b7 a1c1 a8c8 c1c2 c6e5 d1c1 c8c2 c1c2 e5f3 d2f3 a7a5 b4b5 e7c5 f3d4 d8c8 d4b3 c5d6 c2c8 b7c8 b3d2 c8b7 d2c4 d6c5 e2f3 b7d5 f3d5 e6d5 c4e5 a5a4 e5d3 f6e4 d3c5 e4c5 b2d4 c5e4 d4b6 e4d6 g2g4 d6b5 b6c5 b5c7 g1g2 c7e6 c5d6 g7g6 We check at compile time that the TimePoint type is exactly 64 bits long for the compiler (TimePoint is our alias in Stockfish for std::chrono::milliseconds -- it is a signed integer type of at least 45 bits according to the C++ standard, but will most probably be implemented as a 64 bits signed integer on modern compilers), and we use this TimePoint type consistently across the code. Bug report by user "fischerandom" on the TCEC chat (thanks), and the patch includes code and suggestions by user "WOnder93" and Ronald de Man. Fixes issue: https://github.com/official-stockfish/Stockfish/issues/1498 Closes pull request: https://github.com/official-stockfish/Stockfish/pull/1510 No functional change.
114 lines
3.4 KiB
C++
114 lines
3.4 KiB
C++
/*
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Stockfish, a UCI chess playing engine derived from Glaurung 2.1
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Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
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Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad
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Copyright (C) 2015-2018 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
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Stockfish is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Stockfish is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef MISC_H_INCLUDED
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#define MISC_H_INCLUDED
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#include <cassert>
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#include <chrono>
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#include <ostream>
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#include <string>
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#include <vector>
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#include "types.h"
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const std::string engine_info(bool to_uci = false);
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void prefetch(void* addr);
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void prefetch2(void* addr);
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void start_logger(const std::string& fname);
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void dbg_hit_on(bool b);
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void dbg_hit_on(bool c, bool b);
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void dbg_mean_of(int v);
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void dbg_print();
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typedef std::chrono::milliseconds::rep TimePoint; // A value in milliseconds
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static_assert(sizeof(TimePoint) == sizeof(int64_t), "TimePoint should be 64 bits");
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inline TimePoint now() {
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return std::chrono::duration_cast<std::chrono::milliseconds>
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(std::chrono::steady_clock::now().time_since_epoch()).count();
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}
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template<class Entry, int Size>
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struct HashTable {
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Entry* operator[](Key key) { return &table[(uint32_t)key & (Size - 1)]; }
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private:
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std::vector<Entry> table = std::vector<Entry>(Size);
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};
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enum SyncCout { IO_LOCK, IO_UNLOCK };
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std::ostream& operator<<(std::ostream&, SyncCout);
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#define sync_cout std::cout << IO_LOCK
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#define sync_endl std::endl << IO_UNLOCK
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/// xorshift64star Pseudo-Random Number Generator
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/// This class is based on original code written and dedicated
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/// to the public domain by Sebastiano Vigna (2014).
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/// It has the following characteristics:
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///
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/// - Outputs 64-bit numbers
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/// - Passes Dieharder and SmallCrush test batteries
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/// - Does not require warm-up, no zeroland to escape
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/// - Internal state is a single 64-bit integer
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/// - Period is 2^64 - 1
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/// - Speed: 1.60 ns/call (Core i7 @3.40GHz)
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///
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/// For further analysis see
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/// <http://vigna.di.unimi.it/ftp/papers/xorshift.pdf>
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class PRNG {
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uint64_t s;
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uint64_t rand64() {
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s ^= s >> 12, s ^= s << 25, s ^= s >> 27;
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return s * 2685821657736338717LL;
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}
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public:
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PRNG(uint64_t seed) : s(seed) { assert(seed); }
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template<typename T> T rand() { return T(rand64()); }
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/// Special generator used to fast init magic numbers.
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/// Output values only have 1/8th of their bits set on average.
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template<typename T> T sparse_rand()
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{ return T(rand64() & rand64() & rand64()); }
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};
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/// Under Windows it is not possible for a process to run on more than one
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/// logical processor group. This usually means to be limited to use max 64
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/// cores. To overcome this, some special platform specific API should be
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/// called to set group affinity for each thread. Original code from Texel by
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/// Peter Österlund.
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namespace WinProcGroup {
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void bindThisThread(size_t idx);
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}
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#endif // #ifndef MISC_H_INCLUDED
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