Simpler PRNG and faster magics search

[stockfish] / src / misc.h

diff --git a/src/misc.h b/src/misc.h
index 8bf09a86fae8a2d46a8d086f31eb4c6ce30f2308..b9277372aa4ac224dd2c4baf68aebfceef64d711 100644 (file)
--- a/src/misc.h
+++ b/src/misc.h
@@ -1,13 +1,14 @@
 /*
-  Glaurung, a UCI chess playing engine.
-  Copyright (C) 2004-2008 Tord Romstad
+  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
+  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
+  Copyright (C) 2008-2014 Marco Costalba, Joona Kiiski, Tord Romstad
 
-  Glaurung is free software: you can redistribute it and/or modify
+  Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.
 
-  Glaurung is distributed in the hope that it will be useful,
+  Stockfish is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
@@ -16,53 +17,79 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
-#if !defined(MISC_H_INCLUDED)
+#ifndef MISC_H_INCLUDED
 #define MISC_H_INCLUDED
 
+#include <ostream>
+#include <string>
+#include <vector>
+
+#include "types.h"
 
-////
-//// Includes
-////
+const std::string engine_info(bool to_uci = false);
+void timed_wait(WaitCondition&, Lock&, int);
+void prefetch(char* addr);
+void start_logger(bool b);
+
+void dbg_hit_on(bool b);
+void dbg_hit_on_c(bool c, bool b);
+void dbg_mean_of(int v);
+void dbg_print();
+
+
+namespace Time {
+  typedef int64_t point;
+  inline point now() { return system_time_to_msec(); }
+}
 
-#include <string>
 
+template<class Entry, int Size>
+struct HashTable {
+  HashTable() : table(Size, Entry()) {}
+  Entry* operator[](Key key) { return &table[(uint32_t)key & (Size - 1)]; }
 
-////
-//// Constants
-////
+private:
+  std::vector<Entry> table;
+};
 
 
-/// Version number.  If this is left empty, the current date (in the format
-/// YYMMDD) is used as a version number.
+enum SyncCout { IO_LOCK, IO_UNLOCK };
+std::ostream& operator<<(std::ostream&, SyncCout);
 
-const std::string EngineVersion = "2.1";
+#define sync_cout std::cout << IO_LOCK
+#define sync_endl std::endl << IO_UNLOCK
 
 
-////
-//// Macros
-////
+/// xorshift64star Pseudo-Random Number Generator
+/// This class is based on original code written and dedicated
+/// to the public domain by Sebastiano Vigna (2014).
+/// It has the following characteristics:
+///  -  Outputs 64-bit numbers
+///  -  Passes Dieharder and SmallCrush test batteries
+///  -  Does not require warm-up, no zeroland to escape
+///  -  Internal state is a single 64-bit integer
+///  -  Period is 2^64 - 1
+///  -  Speed: 1.60 ns/call (Core i7 @3.40GHz)
+/// For further analysis see
+///   <http://vigna.di.unimi.it/ftp/papers/xorshift.pdf>
 
-#define Min(x, y) (((x) < (y))? (x) : (y))
-#define Max(x, y) (((x) < (y))? (y) : (x))
+class PRNG {
 
+  uint64_t x;
 
-////
-//// Prototypes
-////
+  uint64_t rand64() {
+    x^=x>>12; x^=x<<25; x^=x>>27;
+    return x * 2685821657736338717LL;
+  }
 
-extern const std::string engine_name();
-extern int get_system_time();
-extern int cpu_count();
-extern int Bioskey();
+public:
+  PRNG(uint64_t seed) : x(seed) { assert(seed); }
 
-////
-//// Debug
-////
-extern long dbg_cnt0;
-extern long dbg_cnt1;
-extern void dbg_print_hit_rate();
+  template<typename T> T rand() { return T(rand64()); }
 
-#define dbg_hit_on(x) { dbg_cnt0++; if (x) dbg_cnt1++; }
+  /// Special generator used to fast init magic numbers.
+  /// Output values only have 1/8th of their bits set on average.
+  template<typename T> T sparse_rand() { return T(rand64() & rand64() & rand64()); }
+};
 
-#endif // !defined(MISC_H_INCLUDED)
+#endif // #ifndef MISC_H_INCLUDED