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[Frama-c-discuss] using mathematical modulo in acsl specification

  • Subject: [Frama-c-discuss] using mathematical modulo in acsl specification
  • From: stephane.duprat at atos.net (DUPRAT Stephane)
  • Date: Thu, 6 Dec 2012 07:52:39 +0000
  • In-reply-to: <569C6D7D26484241A530B87F45ADE1F80CA6087D@AOFRWMBXRSC004.resources.atosorigin.local>
  • References: <569C6D7D26484241A530B87F45ADE1F80CA6087D@AOFRWMBXRSC004.resources.atosorigin.local>
Hello,

Finally I've defined my own operator and axioms in an axiomatic block in ACSL.
There was a mistake in my first message, math_mod and % are equal if a>=0 and b>0.

Regards,

St?phane

-----Message d'origine-----
De?: frama-c-discuss-bounces at lists.gforge.inria.fr [mailto:frama-c-discuss-bounces at lists.gforge.inria.fr] De la part de DUPRAT Stephane
Envoy??: jeudi 29 novembre 2012 22:51
??: Frama-c-discuss at lists.gforge.inria.fr
Objet?: [Frama-c-discuss] using mathematical modulo in acsl specification


Hello,

As mentioned in ACSL Doc for Oxygen ?2.2.4, the % operator of ACSL is mapped to the modulo semantic of the ANSI_C that differs from the mathematical modulo.
The modulo operation originating from source code and acsl are both traduced by computer_mod in proof obligations.

First question is how to use mathematical modulo in ACSL specification if it is possible ?

Secondly, is there a gateway between computer_mod and the mathematical modulo (for a%b if a>0 and b<>0) that could allow to use the % operator for modulo of Alt-Ergo in po generated !

Thanks in advance,

St?phane

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