/cvmfs/atlas.cern.ch/repo/sw/ASG/AnalysisBase/2.4.31/CxxUtils/CxxUtils/AthUnlikelyMacros.h
00001 #ifndef CXXUTILS_ATHUNLIKELYMACROS_H 00002 #define CXXUTILS_ATHUNLIKELYMACROS_H 1 00003 00004 /* macros modeled after http://kernelnewbies.org/FAQ/LikelyUnlikely 00005 * to help the compiler into generating instructions to optimize the 00006 * branch prediction. 00007 */ 00008 #if __GNUC__ >= 4 00009 # define ATH_LIKELY(x) __builtin_expect(!!(x), 1) 00010 # define ATH_UNLIKELY(x) __builtin_expect(!!(x), 0) 00011 #else 00012 # define ATH_LIKELY(x) (x) 00013 # define ATH_UNLIKELY(x) (x) 00014 #endif 00015 00016 #endif /* !CXXUTILS_ATHUNLIKELYMACROS_H */
