2 Stockfish, a UCI chess playing engine derived from Glaurung 2.1
3 Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
4 Copyright (C) 2008-2012 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 #if defined(_WIN32) || defined(_WIN64)
22 #define NOMINMAX // disable macros min() and max()
29 # include <sys/pstat.h>
34 #if !defined(NO_PREFETCH)
35 # include <xmmintrin.h>
48 /// Version number. If Version is left empty, then Tag plus current
49 /// date (in the format YYMMDD) is used as a version number.
51 static const string Version = "";
52 static const string Tag = "";
55 /// engine_info() returns the full name of the current Stockfish version.
56 /// This will be either "Stockfish YYMMDD" (where YYMMDD is the date when
57 /// the program was compiled) or "Stockfish <version number>", depending
58 /// on whether Version is empty.
60 const string engine_info(bool to_uci) {
62 const string months("Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec");
63 const string cpu64(Is64Bit ? " 64bit" : "");
64 const string popcnt(HasPopCnt ? " SSE4.2" : "");
66 string month, day, year;
67 stringstream s, date(__DATE__); // From compiler, format is "Sep 21 2008"
71 date >> month >> day >> year;
73 s << "Stockfish " << Tag
74 << setfill('0') << " " << year.substr(2)
75 << setw(2) << (1 + months.find(month) / 4)
79 s << "Stockfish " << Version;
81 s << cpu64 << popcnt << (to_uci ? "\nid author ": " by ")
82 << "Tord Romstad, Marco Costalba and Joona Kiiski";
88 /// Debug functions used mainly to collect run-time statistics
90 static uint64_t hits[2], means[2];
92 void dbg_hit_on(bool b) { hits[0]++; if (b) hits[1]++; }
93 void dbg_hit_on_c(bool c, bool b) { if (c) dbg_hit_on(b); }
94 void dbg_mean_of(int v) { means[0]++; means[1] += v; }
99 cerr << "Total " << hits[0] << " Hits " << hits[1]
100 << " hit rate (%) " << 100 * hits[1] / hits[0] << endl;
103 cerr << "Total " << means[0] << " Mean "
104 << (float)means[1] / means[0] << endl;
108 /// cpu_count() tries to detect the number of CPU cores
112 #if defined(_WIN32) || defined(_WIN64)
115 return std::min(int(s.dwNumberOfProcessors), MAX_THREADS);
118 # if defined(_SC_NPROCESSORS_ONLN)
119 return std::min((int)sysconf(_SC_NPROCESSORS_ONLN), MAX_THREADS);
120 # elif defined(__hpux)
121 struct pst_dynamic psd;
122 if (pstat_getdynamic(&psd, sizeof(psd), (size_t)1, 0) == -1)
124 return std::min((int)psd.psd_proc_cnt, MAX_THREADS);
133 /// timed_wait() waits for msec milliseconds. It is mainly an helper to wrap
134 /// conversion from milliseconds to struct timespec, as used by pthreads.
136 void timed_wait(WaitCondition& sleepCond, Lock& sleepLock, int msec) {
138 #if defined(_WIN32) || defined(_WIN64)
141 timespec ts, *tm = &ts;
142 uint64_t ms = Time::current_time().msec() + msec;
144 ts.tv_sec = ms / 1000;
145 ts.tv_nsec = (ms % 1000) * 1000000LL;
148 cond_timedwait(sleepCond, sleepLock, tm);
152 /// prefetch() preloads the given address in L1/L2 cache. This is a non
153 /// blocking function and do not stalls the CPU waiting for data to be
154 /// loaded from memory, that can be quite slow.
155 #if defined(NO_PREFETCH)
157 void prefetch(char*) {}
161 void prefetch(char* addr) {
163 # if defined(__INTEL_COMPILER) || defined(__ICL)
164 // This hack prevents prefetches to be optimized away by
165 // Intel compiler. Both MSVC and gcc seems not affected.
169 _mm_prefetch(addr, _MM_HINT_T2);
170 _mm_prefetch(addr+64, _MM_HINT_T2); // 64 bytes ahead