X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;ds=sidebyside;f=src%2Fbitcount.h;h=8dfd7d18790ea59f8254faabd0019c3e7a77db32;hb=f196c1bad8928b502c0ad1abd86c35ab53d3468e;hp=8843aba742a58f27e78ea7cc0d1e20043059306d;hpb=954fc950d97c0d484b29ba50b703273bfb33f859;p=stockfish
diff --git a/src/bitcount.h b/src/bitcount.h
index 8843aba7..8dfd7d18 100644
--- a/src/bitcount.h
+++ b/src/bitcount.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) 2008-2012 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
@@ -18,7 +18,7 @@
along with this program. If not, see .
*/
-#if !defined(BITCOUNT_H_INCLUDED)
+#ifndef BITCOUNT_H_INCLUDED
#define BITCOUNT_H_INCLUDED
#include
@@ -32,14 +32,14 @@ enum BitCountType {
CNT_HW_POPCNT
};
-/// Determine at compile time the best popcount<> specialization according if
-/// platform is 32 or 64 bits, to the maximum number of nonzero bits to count
-/// and if hardware popcnt instruction is available.
+/// Determine at compile time the best popcount<> specialization according to
+/// whether the platform is 32 or 64 bit, the maximum number of non-zero
+/// bits to count and if the hardware popcnt instruction is available.
const BitCountType Full = HasPopCnt ? CNT_HW_POPCNT : Is64Bit ? CNT_64 : CNT_32;
const BitCountType Max15 = HasPopCnt ? CNT_HW_POPCNT : Is64Bit ? CNT_64_MAX15 : CNT_32_MAX15;
-/// popcount() counts the number of nonzero bits in a bitboard
+/// popcount() counts the number of non-zero bits in a bitboard
template inline int popcount(Bitboard);
template<>
@@ -81,7 +81,7 @@ inline int popcount(Bitboard b) {
template<>
inline int popcount(Bitboard b) {
-#if !defined(USE_POPCNT)
+#ifndef USE_POPCNT
assert(false);
return b != 0; // Avoid 'b not used' warning
@@ -102,4 +102,4 @@ inline int popcount(Bitboard b) {
#endif
}
-#endif // !defined(BITCOUNT_H_INCLUDED)
+#endif // #ifndef BITCOUNT_H_INCLUDED