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[Frama-c-discuss] Proving a simple property on bitshift with WP

  • Subject: [Frama-c-discuss] Proving a simple property on bitshift with WP
  • From: loic.correnson at cea.fr (Loïc Correnson)
  • Date: Wed, 11 Sep 2013 10:07:01 +0200
  • In-reply-to: <CAC3Lx=a6YhDN3o2GY8BXZC0T5YkP0TOf3ksUNL+oVNO5x-0-5g@mail.gmail.com>
  • References: <CAC3Lx=YN+ofoawh_vint2WumaAd6=akQaLccmrg8BV6wBOphmA@mail.gmail.com> <CA+yPOVj2PgA5gtp-OhSgeNumhmvOmmtM78KNBcVTtBXdzJeAZg@mail.gmail.com> <CAC3Lx=b2ngvaheSxzLr=5ZZi_R1T4fym7uYOW1yV3ARg0QRY-w@mail.gmail.com> <1A32855E5FA08141A8C56E7CF24D442C0EFD8A23@SCTEX101.st-cloud.dassault-avion.fr> <CAC3Lx=YhKt+5FGwwG1cmuFZxQm67QNeRPXmxtnYDqHmTpR189g@mail.gmail.com> <835769EB-9F81-4D66-B430-6C2AF8C6BF46@cea.fr> <CAC3Lx=a6YhDN3o2GY8BXZC0T5YkP0TOf3ksUNL+oVNO5x-0-5g@mail.gmail.com>
This point is not decided yet on our side.
But if you are interested in it, we may think about a more tied cooperation on these topics.
Regards,
	L.

Le 11 sept. 2013 ? 09:10, David MENTRE <dmentre at linux-france.org> a ?crit :

> Hello Lo?c,
> 
> 2013/9/2 Lo?c Correnson <loic.correnson at cea.fr>:
>> Better support for bitwise operators in WP is an on-going work.
>> Technically, we have to cope with the fact that SMT solvers are generally poor when mixing arithmetics and bitwise operations.
>> Our working solution is to use, when needed, extended axiomatization for bitwise operators. The same observation applies to division and non-linear arithmetics.
> 
> Can we expect to have this better axiomatization for bitwise
> operations in next release of Frama-C? I attempted to prove some
> equivalence between two cryptographic codes and hadn't much success to
> say the least. :-)
> 
> Best regards,
> david
> 
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