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>
47 /// Version number. If Version is left empty, then Tag plus current
48 /// date (in the format YYMMDD) is used as a version number.
50 static const string Version = "";
51 static const string Tag = "";
54 /// engine_info() returns the full name of the current Stockfish version.
55 /// This will be either "Stockfish YYMMDD" (where YYMMDD is the date when
56 /// the program was compiled) or "Stockfish <version number>", depending
57 /// on whether Version is empty.
59 const string engine_info(bool to_uci) {
61 const string months("Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec");
62 const string cpu64(Is64Bit ? " 64bit" : "");
63 const string popcnt(HasPopCnt ? " SSE4.2" : "");
65 string month, day, year;
66 stringstream s, date(__DATE__); // From compiler, format is "Sep 21 2008"
70 date >> month >> day >> year;
72 s << "Stockfish " << Tag
73 << setfill('0') << " " << year.substr(2)
74 << setw(2) << (1 + months.find(month) / 4)
78 s << "Stockfish " << Version;
80 s << cpu64 << popcnt << (to_uci ? "\nid author ": " by ")
81 << "Tord Romstad, Marco Costalba and Joona Kiiski";
87 /// Debug functions used mainly to collect run-time statistics
89 static uint64_t hits[2], means[2];
91 void dbg_hit_on(bool b) { hits[0]++; if (b) hits[1]++; }
92 void dbg_hit_on_c(bool c, bool b) { if (c) dbg_hit_on(b); }
93 void dbg_mean_of(int v) { means[0]++; means[1] += v; }
98 cerr << "Total " << hits[0] << " Hits " << hits[1]
99 << " hit rate (%) " << 100 * hits[1] / hits[0] << endl;
102 cerr << "Total " << means[0] << " Mean "
103 << (float)means[1] / means[0] << endl;
107 /// Our fancy logging facility. The trick here is to replace cin.rdbuf() and
108 /// cout.rdbuf() with two Tie objects that tie cin and cout to a file stream. We
109 /// can toggle the logging of std::cout and std:cin at runtime while preserving
110 /// usual i/o functionality and without changing a single line of code!
111 /// Idea from http://groups.google.com/group/comp.lang.c++/msg/1d941c0f26ea0d81
115 Logger() : in(cin.rdbuf(), file), out(cout.rdbuf(), file) {}
116 ~Logger() { start(false); }
118 struct Tie: public streambuf { // MSVC requires splitted streambuf for cin and cout
120 Tie(streambuf* b, ofstream& f) : buf(b), file(f) {}
122 int sync() { return file.rdbuf()->pubsync(), buf->pubsync(); }
123 int overflow(int c) { return log(buf->sputc((char)c), "<< "); }
124 int underflow() { return buf->sgetc(); }
125 int uflow() { return log(buf->sbumpc(), ">> "); }
127 int log(int c, const char* prefix) {
129 static int last = '\n';
132 file.rdbuf()->sputn(prefix, 3);
134 return last = file.rdbuf()->sputc((char)c);
145 static void start(bool b) {
149 if (b && !l.file.is_open())
151 l.file.open("io_log.txt", ifstream::out | ifstream::app);
155 else if (!b && l.file.is_open())
157 cout.rdbuf(l.out.buf);
165 /// Trampoline helper to avoid moving Logger to misc.h
166 void start_logger(bool b) { Logger::start(b); }
169 /// cpu_count() tries to detect the number of CPU cores
173 #if defined(_WIN32) || defined(_WIN64)
176 return s.dwNumberOfProcessors;
179 # if defined(_SC_NPROCESSORS_ONLN)
180 return sysconf(_SC_NPROCESSORS_ONLN);
181 # elif defined(__hpux)
182 struct pst_dynamic psd;
183 if (pstat_getdynamic(&psd, sizeof(psd), (size_t)1, 0) == -1)
185 return psd.psd_proc_cnt;
194 /// timed_wait() waits for msec milliseconds. It is mainly an helper to wrap
195 /// conversion from milliseconds to struct timespec, as used by pthreads.
197 void timed_wait(WaitCondition& sleepCond, Lock& sleepLock, int msec) {
199 #if defined(_WIN32) || defined(_WIN64)
202 timespec ts, *tm = &ts;
203 uint64_t ms = Time::current_time().msec() + msec;
205 ts.tv_sec = ms / 1000;
206 ts.tv_nsec = (ms % 1000) * 1000000LL;
209 cond_timedwait(sleepCond, sleepLock, tm);
213 /// prefetch() preloads the given address in L1/L2 cache. This is a non
214 /// blocking function and do not stalls the CPU waiting for data to be
215 /// loaded from memory, that can be quite slow.
216 #if defined(NO_PREFETCH)
218 void prefetch(char*) {}
222 void prefetch(char* addr) {
224 # if defined(__INTEL_COMPILER) || defined(__ICL)
225 // This hack prevents prefetches to be optimized away by
226 // Intel compiler. Both MSVC and gcc seems not affected.
230 _mm_prefetch(addr, _MM_HINT_T2);
231 _mm_prefetch(addr+64, _MM_HINT_T2); // 64 bytes ahead