# define CDS_DEPRECATED( reason ) __attribute__((deprecated( reason )))
#endif
+// likely/unlikely
+
+#define cds_likely( expr ) __builtin_expect( !!( expr ), 1 )
+#define cds_unlikely( expr ) __builtin_expect( !!( expr ), 0 )
+
+// double-width CAS support
+#if CDS_BUILD_BITS == 64
+ // gcc-4.8 does not support 16-word (128bit) atomics
+# if defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_16 ) && CDS_COMPILER_VERSION >= 40900
+# define CDS_DCAS_SUPPORT
+# endif
+#else
+# ifdef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8
+# define CDS_DCAS_SUPPORT
+# endif
+#endif
+
#include <cds/compiler/gcc/compiler_barriers.h>
#endif // #ifndef CDSLIB_COMPILER_GCC_DEFS_H