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>
49 /// Version number. If Version is left empty, then Tag plus current
50 /// date (in the format YYMMDD) is used as a version number.
52 static const string Version = "";
53 static const string Tag = "";
56 /// engine_info() returns the full name of the current Stockfish version.
57 /// This will be either "Stockfish YYMMDD" (where YYMMDD is the date when
58 /// the program was compiled) or "Stockfish <version number>", depending
59 /// on whether Version is empty.
61 const string engine_info(bool to_uci) {
63 const string months("Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec");
64 const string cpu64(Is64Bit ? " 64bit" : "");
65 const string popcnt(HasPopCnt ? " SSE4.2" : "");
67 string month, day, year;
68 stringstream s, date(__DATE__); // From compiler, format is "Sep 21 2008"
72 date >> month >> day >> year;
74 s << "Stockfish " << Tag
75 << setfill('0') << " " << year.substr(2)
76 << setw(2) << (1 + months.find(month) / 4)
80 s << "Stockfish " << Version;
82 s << cpu64 << popcnt << (to_uci ? "\nid author ": " by ")
83 << "Tord Romstad, Marco Costalba and Joona Kiiski";
89 /// Debug functions used mainly to collect run-time statistics
91 static uint64_t hits[2], means[2];
93 void dbg_hit_on(bool b) { hits[0]++; if (b) hits[1]++; }
94 void dbg_hit_on_c(bool c, bool b) { if (c) dbg_hit_on(b); }
95 void dbg_mean_of(int v) { means[0]++; means[1] += v; }
100 cerr << "Total " << hits[0] << " Hits " << hits[1]
101 << " hit rate (%) " << 100 * hits[1] / hits[0] << endl;
104 cerr << "Total " << means[0] << " Mean "
105 << (float)means[1] / means[0] << endl;
109 /// Our fancy logging facility. The trick here is to replace cout.rdbuf() with
110 /// this one that sends the output both to console and to a file, this allow us
111 /// to toggle the logging of std::cout to a file while preserving output to
112 /// stdout and without changing a single line of code! Idea and code from:
113 /// http://groups.google.com/group/comp.lang.c++/msg/1d941c0f26ea0d81
115 class Logger: public streambuf {
117 typedef char_traits<char> traits_type;
118 typedef traits_type::int_type int_type;
120 Logger() : cout_buf(cout.rdbuf()) {}
121 ~Logger() { set(false); }
125 if (b && !file.is_open())
127 file.open("out.txt", ifstream::out | ifstream::app);
130 else if (!b && file.is_open())
132 cout.rdbuf(cout_buf);
138 int_type overflow(int_type c) {
140 if (traits_type::eq_int_type(c, traits_type::eof()))
141 return traits_type::not_eof(c);
143 c = cout_buf->sputc(traits_type::to_char_type(c));
145 if (!traits_type::eq_int_type(c, traits_type::eof()))
146 c = file.rdbuf()->sputc(traits_type::to_char_type(c));
153 int c = cout_buf->pubsync();
156 c = file.rdbuf()->pubsync();
165 void logger_set(bool b) {
172 /// cpu_count() tries to detect the number of CPU cores
176 #if defined(_WIN32) || defined(_WIN64)
179 return std::min(int(s.dwNumberOfProcessors), MAX_THREADS);
182 # if defined(_SC_NPROCESSORS_ONLN)
183 return std::min((int)sysconf(_SC_NPROCESSORS_ONLN), MAX_THREADS);
184 # elif defined(__hpux)
185 struct pst_dynamic psd;
186 if (pstat_getdynamic(&psd, sizeof(psd), (size_t)1, 0) == -1)
188 return std::min((int)psd.psd_proc_cnt, MAX_THREADS);
197 /// timed_wait() waits for msec milliseconds. It is mainly an helper to wrap
198 /// conversion from milliseconds to struct timespec, as used by pthreads.
200 void timed_wait(WaitCondition& sleepCond, Lock& sleepLock, int msec) {
202 #if defined(_WIN32) || defined(_WIN64)
205 timespec ts, *tm = &ts;
206 uint64_t ms = Time::current_time().msec() + msec;
208 ts.tv_sec = ms / 1000;
209 ts.tv_nsec = (ms % 1000) * 1000000LL;
212 cond_timedwait(sleepCond, sleepLock, tm);
216 /// prefetch() preloads the given address in L1/L2 cache. This is a non
217 /// blocking function and do not stalls the CPU waiting for data to be
218 /// loaded from memory, that can be quite slow.
219 #if defined(NO_PREFETCH)
221 void prefetch(char*) {}
225 void prefetch(char* addr) {
227 # if defined(__INTEL_COMPILER) || defined(__ICL)
228 // This hack prevents prefetches to be optimized away by
229 // Intel compiler. Both MSVC and gcc seems not affected.
233 _mm_prefetch(addr, _MM_HINT_T2);
234 _mm_prefetch(addr+64, _MM_HINT_T2); // 64 bytes ahead