--- layout: fc_discuss_archives title: Message 51 from Frama-C-discuss on December 2009 ---
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[Frama-c-discuss] Problem with bitwise xor



OK, I see now your problem. Thanks for the report.

- Claude

Hollas Boris (CR/AEY1) wrote:
>> Sorry for the dumb answer:  with which values of x and y do not you
>> think there is an overflow ?
>>     
>
>   
>> I don't even understand what arithmetic overflow may mean for xor.
>>     
>
> Jesse generates VC for arithmetic overflow and can't prove them. You are right that with bitwise operations, no overflow can occur. Still Jessie tries to verify sth and fails. Hence, I don't get green bullets for this code.
>
> I filed bug report http://bts.frama-c.com/view.php?id=348 on this.
>
> -Boris
>
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-- 
Claude March?                          | tel: +33 1 72 92 59 69           
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