The __builtin_expect function provided by GCC comes to my mind here. While I would root for a great profile based collection system, this could be very helpful as an stopgap into that direction.

http://stackoverflow.com/questions/7346929/why-do-we-use-builtin-expect-when-a-straightforward-way-is-to-use-if-else

category:cq
theme:profile-feedback
skill-level:expert
cost:large