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[Frama-c-discuss] Predicates with bitwise operators?

Hello,

The problem is that Qed (the WP simplifier) does not unfold definition on its own, and alt-ergo can not perform bitwise operation.
However, in the GUI, you can select your goal and apply the « Definition » tactic which allows Qed to solve the problem.

Otherwise, you can turn you predicate into a macro…

	L.


> Le 27 juil. 2017 à 19:25, Yifan Lu <me at yifanlu.com> a écrit :
> 
> Hi,
> 
> I wrote the following
> 
>  //@ predicate is_power_2(integer x) = x >= 0 && ((x & (x-1)) == 0);
> 
> and I'm trying to test it (Typed+cint) with
> 
>  //@ assert is_power_2(2);
>  //@ assert is_power_2(8);
>  //@ assert is_power_2(4);
>  //@ assert is_power_2(64);
>  //@ assert !is_power_2(66);
> 
> Unfortunately, WP does not seem to find a proof for any of them. Any ideas?
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