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

[H. Peter Anvin]

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


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