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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: dmentre at linux-france.org (David MENTRE)
  • Date: Wed, 11 Sep 2013 09:10:48 +0200
  • In-reply-to: <835769EB-9F81-4D66-B430-6C2AF8C6BF46@cea.fr>
  • 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>
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