Re: Divide by zero detection

Alex Colvin <alexc@TheWorld.com>
Fri, 21 Sep 2007 02:02:31 +0000 (UTC)

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From: Alex Colvin <alexc@TheWorld.com>
Newsgroups: comp.compilers
Date: Fri, 21 Sep 2007 02:02:31 +0000 (UTC)
Organization: The World : www.TheWorld.com : Since 1989
References: 07-09-074 07-09-078
Keywords: arithmetic, analysis
Posted-Date: 21 Sep 2007 02:21:07 EDT

>> I am looking for tools able to detect inside the source code,
>> potential divide by zero errors. Does it exist. For what languages,
>> what platform ? Thanks for your help


I think you're unlikely to find this in software, as it's one of the
errors that is reliably and efficiently detected in hardware.


>No zero divide there, either. Doing the analysis properly is doubtless
>undecidable, but with aggressive dataflow analysis you should be able to
>rule out a lot of known non-zero divisors. -John]


Can you asseme 0s must come from constant 0, addition, subtraction or
bitwise operation, or division. Multiplication only propagates existing
zeros. See if any of these can reach your divisor.
--
mac the naof


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