Small simplification in gives_check

[stockfish] / src / bitbase.cpp

diff --git a/src/bitbase.cpp b/src/bitbase.cpp
index 752d4f0e79c0b480b56697622c538600ec467951..cd6a7329724e4260bc1529ca9756e82b8265adb9 100644 (file)
--- a/src/bitbase.cpp
+++ b/src/bitbase.cpp
@@ -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) 2008-2013 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2014 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
@@ -26,14 +26,14 @@
 namespace {
 
   // There are 24 possible pawn squares: the first 4 files and ranks from 2 to 7
-  const unsigned IndexMax = 2*24*64*64; // stm * psq * wksq * bksq = 196608
+  const unsigned MAX_INDEX = 2*24*64*64; // stm * psq * wksq * bksq = 196608
 
   // Each uint32_t stores results of 32 positions, one per bit
-  uint32_t KPKBitbase[IndexMax / 32];
+  uint32_t KPKBitbase[MAX_INDEX / 32];
 
   // A KPK bitbase index is an integer in [0, IndexMax] range
   //
-  // Information is mapped in a way that minimizes number of iterations:
+  // Information is mapped in a way that minimizes the number of iterations:
   //
   // bit  0- 5: white king square (from SQ_A1 to SQ_H8)
   // bit  6-11: black king square (from SQ_A1 to SQ_H8)
@@ -84,20 +84,20 @@ void Bitbases::init_kpk() {
 
   unsigned idx, repeat = 1;
   std::vector<KPKPosition> db;
-  db.reserve(IndexMax);
+  db.reserve(MAX_INDEX);
 
   // Initialize db with known win / draw positions
-  for (idx = 0; idx < IndexMax; ++idx)
+  for (idx = 0; idx < MAX_INDEX; ++idx)
       db.push_back(KPKPosition(idx));
 
   // Iterate through the positions until none of the unknown positions can be
   // changed to either wins or draws (15 cycles needed).
   while (repeat)
-      for (repeat = idx = 0; idx < IndexMax; ++idx)
+      for (repeat = idx = 0; idx < MAX_INDEX; ++idx)
           repeat |= (db[idx] == UNKNOWN && db[idx].classify(db) != UNKNOWN);
 
   // Map 32 results into one KPKBitbase[] entry
-  for (idx = 0; idx < IndexMax; ++idx)
+  for (idx = 0; idx < MAX_INDEX; ++idx)
       if (db[idx] == WIN)
           KPKBitbase[idx / 32] |= 1 << (idx & 0x1F);
 }