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[Frama-c-discuss] extended_Euclide

  • Subject: [Frama-c-discuss] extended_Euclide
  • From: maxim.gaina at studenti.unipr.it (MAXIM GAINA)
  • Date: Fri, 23 May 2014 09:50:39 +0200
Good morning.

While training on Frama-C in a Semanthics class, I tried the example shown
on page 41 of ACSL handbook (
http://frama-c.com/download/acsl-implementation-Neon-20140301.pdf), which
exemplifies a possible implementation of Extended Euclide Algorithm.
However, I was not able to proof any relevant property: am I missing
something?

The code is attached. I am using Frama-C Neon on a 64-bit Fedora 20. I used
Alt-Ergo (Native) as theorem proover, having enabled both RTE and
Invariants. The Bezout property could not be proved in the contract (orange
ball) but is partially proved before the while loop, inside the function
(green/red ball).

Waiting for an answer, I offer my best regards
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