Re: [RFC] gcc feature request: Moving blocks into sections

H. Peter Anvin
2013-08-05T17:02:28Z

On 08/05/2013 09:55 AM, Steven Rostedt wrote:
>
> Almost a full year ago, Mathieu suggested something like:
>
> if (unlikely(x)) __attribute__((section(".unlikely"))) {
> ...
> } else __attribute__((section(".likely"))) {
> ...
> }
>
> https://lkml.org/lkml/2012/8/9/658
>
> Which got me thinking. How hard would it be to set a block in its own
> section. Like what Mathieu suggested, but it doesn't have to be
> ".unlikely".
>
> if (x) __attibute__((section(".foo"))) {
> /* do something */
> }
>

One concern I have is how this kind of code would work when embedded
inside a function which already has a section attribute. This could
easily cause really weird bugs when someone "optimizes" an inline or
macro and breaks a single call site...

-hpa