Re: [ros-dev] gcc problem or not

[Mark Junker]

Hartmut Birr schrieb:

>  You are right, but I've still assumed that the
> pointer is zero or valid.
> The real problem is, that gcc doesn't stop to validate an expression if
> the result is determined and if the expression consist of simple
> expressions which are combined with OR.
>   
>  
Does this also happen when using something like the following?

if (p!=NULL && p->val==0) {
}


I would assume that GCC's optimizer realizes that your (not mine above) 
sample code is just some kind of switch statement that can be heavily 
optimized. This kind of optimization (-> switch) is ok in this situation.

And I have to admit that the optimization is quite good because it 
avoids a conditional jump.

Regards,
Mark