Something like __builtin_expect for enums?

[Sebastian Huber <sebastian dot huber at embedded-brains dot de>]

Hello,

in GCC we can use __builtin_expect() to give the compiler a branch prediction 
information for expressions.  Is it possible to use an attribute for enums to 
say that enum value A is more likely than B, e.g.

enum e {
	__attribute__((likely)) A,
	B,
	C
};

This is useful for status codes that are encoded in an enum, e.g.

enum status = func();
if (status != ERROR_STATUS) {
  blablub();
}

I found  nothing in the manual.  Maybe this is a useful enhancement for the GCC?

--
Sebastian Huber, embedded brains GmbH

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