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Compilers.hh

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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

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