00001 /* 00002 00003 Helper macros for special compiler features 00004 Copyright (C) 2002 Jussi Laako 00005 00006 This program is free software; you can redistribute it and/or modify 00007 it under the terms of the GNU General Public License as published by 00008 the Free Software Foundation; either version 2 of the License, or 00009 (at your option) any later version. 00010 00011 This program is distributed in the hope that it will be useful, 00012 but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00014 GNU General Public License for more details. 00015 00016 You should have received a copy of the GNU General Public License 00017 along with this program; if not, write to the Free Software 00018 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 00019 00020 */ 00021 00022 00023 #ifndef COMPILERS_HH 00024 #define COMPILERS_HH 00025 00026 #if ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 1)) 00027 #define likely(x) __builtin_expect(x, 1) 00028 #define unlikely(x) __builtin_expect(x, 0) 00029 #define prefetch(x, w, l) __builtin_prefetch(x, w, l) 00030 #else 00031 #define likely(x) (x) 00032 #define unlikely(x) (x) 00033 #define prefetch(x, w, l) 00034 #endif 00035 00036 #endif