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/>.
22 #define _CRT_SECURE_NO_DEPRECATE
23 #define NOMINMAX // disable macros min() and max()
25 #include <sys/timeb.h>
29 # include <sys/time.h>
30 # include <sys/types.h>
33 # include <sys/pstat.h>
38 #if !defined(NO_PREFETCH)
39 # include <xmmintrin.h>
55 /// Version number. If Version is left empty, then Tag plus current
56 /// date (in the format YYMMDD) is used as a version number.
58 static const string Version = "";
59 static const string Tag = "";
62 /// engine_info() returns the full name of the current Stockfish version.
63 /// This will be either "Stockfish YYMMDD" (where YYMMDD is the date when
64 /// the program was compiled) or "Stockfish <version number>", depending
65 /// on whether Version is empty.
67 const string engine_info(bool to_uci) {
69 const string months("Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec");
70 const string cpu64(Is64Bit ? " 64bit" : "");
71 const string popcnt(HasPopCnt ? " SSE4.2" : "");
73 string month, day, year;
74 stringstream s, date(__DATE__); // From compiler, format is "Sep 21 2008"
78 date >> month >> day >> year;
80 s << "Stockfish " << Tag
81 << setfill('0') << " " << year.substr(2)
82 << setw(2) << (1 + months.find(month) / 4)
83 << setw(2) << day << cpu64 << popcnt;
86 s << "Stockfish " << Version << cpu64 << popcnt;
88 s << (to_uci ? "\nid author ": " by ")
89 << "Tord Romstad, Marco Costalba and Joona Kiiski";
95 /// Debug functions used mainly to collect run-time statistics
97 static uint64_t hits[2], means[2];
99 void dbg_hit_on(bool b) { hits[0]++; if (b) hits[1]++; }
100 void dbg_hit_on_c(bool c, bool b) { if (c) dbg_hit_on(b); }
101 void dbg_mean_of(int v) { means[0]++; means[1] += v; }
106 cerr << "Total " << hits[0] << " Hits " << hits[1]
107 << " hit rate (%) " << 100 * hits[1] / hits[0] << endl;
110 cerr << "Total " << means[0] << " Mean "
111 << (float)means[1] / means[0] << endl;
115 /// system_time() returns the current system time, measured in milliseconds
119 #if defined(_MSC_VER)
122 return int(t.time * 1000 + t.millitm);
125 gettimeofday(&t, NULL);
126 return t.tv_sec * 1000 + t.tv_usec / 1000;
131 /// cpu_count() tries to detect the number of CPU cores
135 #if defined(_MSC_VER)
138 return std::min(int(s.dwNumberOfProcessors), MAX_THREADS);
141 # if defined(_SC_NPROCESSORS_ONLN)
142 return std::min((int)sysconf(_SC_NPROCESSORS_ONLN), MAX_THREADS);
143 # elif defined(__hpux)
144 struct pst_dynamic psd;
145 if (pstat_getdynamic(&psd, sizeof(psd), (size_t)1, 0) == -1)
147 return std::min((int)psd.psd_proc_cnt, MAX_THREADS);
156 /// timed_wait() waits for msec milliseconds. It is mainly an helper to wrap
157 /// conversion from milliseconds to struct timespec, as used by pthreads.
159 void timed_wait(WaitCondition* sleepCond, Lock* sleepLock, int msec) {
161 #if defined(_MSC_VER)
165 struct timespec abstime, *tm = &abstime;
167 gettimeofday(&t, NULL);
169 abstime.tv_sec = t.tv_sec + (msec / 1000);
170 abstime.tv_nsec = (t.tv_usec + (msec % 1000) * 1000) * 1000;
172 if (abstime.tv_nsec > 1000000000LL)
175 abstime.tv_nsec -= 1000000000LL;
179 cond_timedwait(sleepCond, sleepLock, tm);
183 /// prefetch() preloads the given address in L1/L2 cache. This is a non
184 /// blocking function and do not stalls the CPU waiting for data to be
185 /// loaded from memory, that can be quite slow.
186 #if defined(NO_PREFETCH)
188 void prefetch(char*) {}
192 void prefetch(char* addr) {
194 # if defined(__INTEL_COMPILER) || defined(__ICL)
195 // This hack prevents prefetches to be optimized away by
196 // Intel compiler. Both MSVC and gcc seems not affected.
200 _mm_prefetch(addr, _MM_HINT_T2);
201 _mm_prefetch(addr+64, _MM_HINT_T2); // 64 bytes ahead