From: John McCabe <jgm@hayling.cwmbran.gecm.com>
Subject: Re: Renaming Fixed Point Mutiplicative operator in Ada 95
Date: 1998/05/22
Date: 1998-05-22T00:00:00+00:00 [thread overview]
Message-ID: <6k3dj2$15e@gcsin3.geccs.gecm.com> (raw)
In-Reply-To: 356536FD.87A2B0A@praxis-cs.co.uk
Rod Chapman <rod@praxis-cs.co.uk> wrote:
>Robert Dewar wrote:
>
>> Incidentally, in a critical system, I would jolly well hope that EITHER
>>
>> a) you prove that division by zero cannot happen
>>
>
>We've done that (for all exceptions) for several non-trivial SPARK programs.
>It's actually a useful exercise too!
I performed a similar exercise once but, rather than divide by zero, I
had to prove that our program would not be affected by data dependencies
in the floating point unit of a GPS MA31750 MIL-STD-1750A processor that
would result in the wrong answer. It was quite interesting and saved a
lot of effort in the long run!
--
Best Regards
John McCabe
=====================================================================
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should in no way be taken as the opinion of anyone I am currently
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=====================================================================
next prev parent reply other threads:[~1998-05-22 0:00 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
1998-05-19 0:00 Renaming Fixed Point Mutiplicative operator in Ada 95 Stuart Hutchesson
1998-05-19 0:00 ` Matthew Heaney
1998-05-20 0:00 ` Robert Dewar
[not found] ` <matthew_heaney-ya023680002005981908570001@news.ni.net>
1998-05-21 0:00 ` Robert Dewar
1998-05-22 0:00 ` Robert I. Eachus
1998-05-23 0:00 ` Robert Dewar
[not found] ` <01bd84c3$47215d60$440029a1@m00rq900>
1998-05-21 0:00 ` Robert Dewar
1998-05-21 0:00 ` Matthew Heaney
1998-05-21 0:00 ` Robert Dewar
1998-05-21 0:00 ` Simon Pilgrim
1998-05-21 0:00 ` Matthew Heaney
1998-05-22 0:00 ` Robert I. Eachus
1998-05-22 0:00 ` Stuart Hutchesson
1998-05-22 0:00 ` Matthew Heaney
1998-05-23 0:00 ` Robert Dewar
1998-05-22 0:00 ` Rod Chapman
1998-05-22 0:00 ` John McCabe [this message]
1998-05-21 0:00 ` John McCabe
1998-05-21 0:00 ` Matthew Heaney
1998-05-21 0:00 ` Robert Dewar
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