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[Frama-c-discuss] Value analysis and termination

  • Subject: [Frama-c-discuss] Value analysis and termination
  • From: pascal.cuoq at (Pascal Cuoq)
  • Date: Tue, 12 Oct 2010 07:48:56 +0200
  • In-reply-to: <1286823000.2466.79.camel@iti27>
  • References: <1286823000.2466.79.camel@iti27>


On Mon, Oct 11, 2010 at 8:50 PM, Boris Hollas
<hollas at> wrote:
> However, the value analysis shows i \in {-4,0,4} at this point. But i ==
> 0 is not possible since !(i % 2 == 0) is necessary for the loop to
> terminate. ?Why doesn't the value analysis detect this?

It comes down to the fact that the following piece of program
  if (i % C1 == C2) { ... }
does not reduce the value of i in the "then" branch.

It could, of course. I will see if a pattern can be added easily for
this construction. But there is no limit to the number of
constructions for which something smart could be done. You have to
stop somewhere.