Simplify reduced depth search

[stockfish] / src / misc.h

diff --git a/src/misc.h b/src/misc.h
index b9277372aa4ac224dd2c4baf68aebfceef64d711..68b9c8842b9ba19cd14899429b35aea22414d305 100644 (file)
--- a/src/misc.h
+++ b/src/misc.h
@@ -1,7 +1,6 @@
 /*
   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
+  Copyright (C) 2004-2020 The Stockfish developers (see AUTHORS file)
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -20,6 +19,8 @@
 #ifndef MISC_H_INCLUDED
 #define MISC_H_INCLUDED
 
+#include <cassert>
+#include <chrono>
 #include <ostream>
 #include <string>
 #include <vector>
@@ -27,29 +28,32 @@
 #include "types.h"
 
 const std::string engine_info(bool to_uci = false);
-void timed_wait(WaitCondition&, Lock&, int);
-void prefetch(char* addr);
-void start_logger(bool b);
+const std::string compiler_info();
+void prefetch(void* addr);
+void start_logger(const std::string& fname);
+void* std_aligned_alloc(size_t alignment, size_t size);
+void std_aligned_free(void* ptr);
+void* aligned_ttmem_alloc(size_t size, void*& mem);
+void aligned_ttmem_free(void* mem); // nop if mem == nullptr
 
 void dbg_hit_on(bool b);
-void dbg_hit_on_c(bool c, bool b);
+void dbg_hit_on(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(); }
+typedef std::chrono::milliseconds::rep TimePoint; // A value in milliseconds
+static_assert(sizeof(TimePoint) == sizeof(int64_t), "TimePoint should be 64 bits");
+inline TimePoint now() {
+  return std::chrono::duration_cast<std::chrono::milliseconds>
+        (std::chrono::steady_clock::now().time_since_epoch()).count();
 }
 
-
 template<class Entry, int Size>
 struct HashTable {
-  HashTable() : table(Size, Entry()) {}
   Entry* operator[](Key key) { return &table[(uint32_t)key & (Size - 1)]; }
 
 private:
-  std::vector<Entry> table;
+  std::vector<Entry> table = std::vector<Entry>(Size); // Allocate on the heap
 };
 
 
@@ -64,32 +68,67 @@ std::ostream& operator<<(std::ostream&, SyncCout);
 /// 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>
 
 class PRNG {
 
-  uint64_t x;
+  uint64_t s;
 
   uint64_t rand64() {
-    x^=x>>12; x^=x<<25; x^=x>>27;
-    return x * 2685821657736338717LL;
+
+    s ^= s >> 12, s ^= s << 25, s ^= s >> 27;
+    return s * 2685821657736338717LL;
   }
 
 public:
-  PRNG(uint64_t seed) : x(seed) { assert(seed); }
+  PRNG(uint64_t seed) : s(seed) { assert(seed); }
 
   template<typename T> T rand() { return T(rand64()); }
 
   /// 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()); }
+  template<typename T> T sparse_rand()
+  { return T(rand64() & rand64() & rand64()); }
 };
 
+inline uint64_t mul_hi64(uint64_t a, uint64_t b) {
+#if defined(__GNUC__) && defined(IS_64BIT)
+    __extension__ typedef unsigned __int128 uint128;
+    return ((uint128)a * (uint128)b) >> 64;
+#else
+    uint64_t aL = (uint32_t)a, aH = a >> 32;
+    uint64_t bL = (uint32_t)b, bH = b >> 32;
+    uint64_t c1 = (aL * bL) >> 32;
+    uint64_t c2 = aH * bL + c1;
+    uint64_t c3 = aL * bH + (uint32_t)c2;
+    return aH * bH + (c2 >> 32) + (c3 >> 32);
+#endif
+}
+
+/// Under Windows it is not possible for a process to run on more than one
+/// logical processor group. This usually means to be limited to use max 64
+/// cores. To overcome this, some special platform specific API should be
+/// called to set group affinity for each thread. Original code from Texel by
+/// Peter Österlund.
+
+namespace WinProcGroup {
+  void bindThisThread(size_t idx);
+}
+
+namespace CommandLine {
+  void init(int argc, char* argv[]);
+
+  extern std::string binaryDirectory;  // path of the executable directory
+  extern std::string workingDirectory; // path of the working directory
+}
+
 #endif // #ifndef MISC_H_INCLUDED