Fix random moves when time < 10ms

[stockfish] / src / rkiss.h

diff --git a/src/rkiss.h b/src/rkiss.h
index 0863c9cf7520ce279c4f1666f97e17d4ae52f290..9564253b91a81301a70fd029163eac470248187c 100644 (file)
--- a/src/rkiss.h
+++ b/src/rkiss.h
@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2013 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -20,59 +20,55 @@
   available under 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.
-
- ** A small "keep it simple and stupid" RNG with some fancy merits:
- **
- ** Quite platform independent
- ** Passes ALL dieharder tests! Here *nix sys-rand() e.g. fails miserably:-)
- ** ~12 times faster than my *nix sys-rand()
- ** ~4 times faster than SSE2-version of Mersenne twister
- ** Average cycle length: ~2^126
- ** 64 bit seed
- ** Return doubles with a full 53 bit mantissa
- ** Thread safe
- **
- ** (c) Heinz van Saanen
-
 */
 
-#if !defined(RKISS_H_INCLUDED)
+#ifndef RKISS_H_INCLUDED
 #define RKISS_H_INCLUDED
 
 #include "types.h"
 
+/// RKISS is our pseudo random number generator (PRNG) used to compute hash keys.
+/// George Marsaglia invented the RNG-Kiss-family in the early 90's. This is a
+/// specific version that Heinz van Saanen derived from some public domain code
+/// by Bob Jenkins. Following the feature list, as tested by Heinz.
+///
+/// - Quite platform independent
+/// - Passes ALL dieharder tests! Here *nix sys-rand() e.g. fails miserably:-)
+/// - ~12 times faster than my *nix sys-rand()
+/// - ~4 times faster than SSE2-version of Mersenne twister
+/// - Average cycle length: ~2^126
+/// - 64 bit seed
+/// - Return doubles with a full 53 bit mantissa
+/// - Thread safe
+
 class RKISS {
 
-  // Keep variables always together
-  struct S { uint64_t a, b, c, d; } s;
+  struct S { uint64_t a, b, c, d; } s; // Keep variables always together
 
-  uint64_t rot(uint64_t x, uint64_t k) const {
+  uint64_t rotate(uint64_t x, uint64_t k) const {
     return (x << k) | (x >> (64 - k));
   }
 
-  // Return 64 bit unsigned integer in between [0, 2^64 - 1]
   uint64_t rand64() {
 
     const uint64_t
-      e = s.a - rot(s.b,  7);
-    s.a = s.b ^ rot(s.c, 13);
-    s.b = s.c + rot(s.d, 37);
+      e = s.a - rotate(s.b,  7);
+    s.a = s.b ^ rotate(s.c, 13);
+    s.b = s.c + rotate(s.d, 37);
     s.c = s.d + e;
     return s.d = e + s.a;
   }
 
-  // Init seed and scramble a few rounds
-  void raninit() {
+public:
+  RKISS(int seed = 73) {
 
     s.a = 0xf1ea5eed;
     s.b = s.c = s.d = 0xd4e12c77;
-    for (int i = 0; i < 73; i++)
+    for (int i = 0; i < seed; i++) // Scramble a few rounds
         rand64();
   }
 
-public:
-  RKISS() { raninit(); }
   template<typename T> T rand() { return T(rand64()); }
 };
 
-#endif // !defined(RKISS_H_INCLUDED)
+#endif // #ifndef RKISS_H_INCLUDED