OK for the trunk?
Tobias
diff --git a/libgfortran/libgfortran.h b/libgfortran/libgfortran.h index d7e15ad..2664e1f 100644 --- a/libgfortran/libgfortran.h +++ b/libgfortran/libgfortran.h @@ -97,6 +97,16 @@ typedef off_t gfc_offset; #define NULL (void *) 0 #endif + +/* The following macros can be used to annotate conditions which are likely or + unlikely to be true. Avoid using them when a condition is only slightly + more likely/less unlikely than average to avoid the performance penalties of + branch misprediction. In addition, as __builtin_expect overrides the compiler + heuristic, do not use in conditions where one of the branches ends with a + call to a function with __attributee__((noreturn)): the compiler internal + heuristic will mark this branch as much less likely as unlikely() would + do. */ + #ifndef __GNUC__ #define __attribute__(x) #define likely(x) (x)
