Likely.h

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#ifndef FWCore_Utilities_Likely_h
#define FWCore_Utilities_Likely_h
#include "FWCore/Utilities/interface/GCCPrerequisite.h"

#if GCC_PREREQUISITE(3,0,0)

#if defined(NO_LIKELY)
#define likely(x) (x)
#define unlikely(x) (x)   
#elif defined(REVERSE_LIKELY)
#define unlikely(x) (__builtin_expect(x, true))
#define likely(x) (__builtin_expect(x, false))
#else
#define likely(x) (__builtin_expect(x, true))
#define unlikely(x) (__builtin_expect(x, false))
#endif

#else
#define NO_LIKELY
#define likely(x) (x)  
#define unlikely(x) (x)
#endif

#endif