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>
56 /// Version number. If Version is left empty, then Tag plus current
57 /// date (in the format YYMMDD) is used as a version number.
59 static const string Version = "";
60 static const string Tag = "";
63 /// engine_info() returns the full name of the current Stockfish version.
64 /// This will be either "Stockfish YYMMDD" (where YYMMDD is the date when
65 /// the program was compiled) or "Stockfish <version number>", depending
66 /// on whether Version is empty.
68 const string engine_info(bool to_uci) {
70 const string months("Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec");
71 const string cpu64(Is64Bit ? " 64bit" : "");
72 const string popcnt(HasPopCnt ? " SSE4.2" : "");
74 string month, day, year;
75 stringstream s, date(__DATE__); // From compiler, format is "Sep 21 2008"
79 date >> month >> day >> year;
81 s << "Stockfish " << Tag
82 << setfill('0') << " " << year.substr(2)
83 << setw(2) << (1 + months.find(month) / 4)
84 << setw(2) << day << cpu64 << popcnt;
87 s << "Stockfish " << Version << cpu64 << popcnt;
89 s << (to_uci ? "\nid author ": " by ")
90 << "Tord Romstad, Marco Costalba and Joona Kiiski";
96 /// Debug stuff. Helper functions used mainly for debugging purposes
98 static uint64_t dbg_hit_cnt0;
99 static uint64_t dbg_hit_cnt1;
100 static uint64_t dbg_mean_cnt0;
101 static uint64_t dbg_mean_cnt1;
103 void dbg_print_hit_rate() {
106 cerr << "Total " << dbg_hit_cnt0 << " Hit " << dbg_hit_cnt1
107 << " hit rate (%) " << 100 * dbg_hit_cnt1 / dbg_hit_cnt0 << endl;
110 void dbg_print_mean() {
113 cerr << "Total " << dbg_mean_cnt0 << " Mean "
114 << (float)dbg_mean_cnt1 / dbg_mean_cnt0 << endl;
117 void dbg_mean_of(int v) {
123 void dbg_hit_on(bool b) {
130 void dbg_hit_on_c(bool c, bool b) { if (c) dbg_hit_on(b); }
131 void dbg_before() { dbg_hit_on(false); }
132 void dbg_after() { dbg_hit_on(true); dbg_hit_cnt0--; }
135 /// system_time() returns the current system time, measured in milliseconds
139 #if defined(_MSC_VER)
142 return int(t.time * 1000 + t.millitm);
145 gettimeofday(&t, NULL);
146 return t.tv_sec * 1000 + t.tv_usec / 1000;
151 /// cpu_count() tries to detect the number of CPU cores
155 #if defined(_MSC_VER)
158 return std::min(int(s.dwNumberOfProcessors), MAX_THREADS);
161 # if defined(_SC_NPROCESSORS_ONLN)
162 return std::min((int)sysconf(_SC_NPROCESSORS_ONLN), MAX_THREADS);
163 # elif defined(__hpux)
164 struct pst_dynamic psd;
165 if (pstat_getdynamic(&psd, sizeof(psd), (size_t)1, 0) == -1)
167 return std::min((int)psd.psd_proc_cnt, MAX_THREADS);
176 /// timed_wait() waits for msec milliseconds. It is mainly an helper to wrap
177 /// conversion from milliseconds to struct timespec, as used by pthreads.
179 void timed_wait(WaitCondition* sleepCond, Lock* sleepLock, int msec) {
181 #if defined(_MSC_VER)
185 struct timespec abstime, *tm = &abstime;
187 gettimeofday(&t, NULL);
189 abstime.tv_sec = t.tv_sec + (msec / 1000);
190 abstime.tv_nsec = (t.tv_usec + (msec % 1000) * 1000) * 1000;
192 if (abstime.tv_nsec > 1000000000LL)
195 abstime.tv_nsec -= 1000000000LL;
199 cond_timedwait(sleepCond, sleepLock, tm);
203 /// prefetch() preloads the given address in L1/L2 cache. This is a non
204 /// blocking function and do not stalls the CPU waiting for data to be
205 /// loaded from memory, that can be quite slow.
206 #if defined(NO_PREFETCH)
208 void prefetch(char*) {}
212 void prefetch(char* addr) {
214 #if defined(__INTEL_COMPILER) || defined(__ICL)
215 // This hack prevents prefetches to be optimized away by
216 // Intel compiler. Both MSVC and gcc seems not affected.
220 _mm_prefetch(addr, _MM_HINT_T2);
221 _mm_prefetch(addr+64, _MM_HINT_T2); // 64 bytes ahead