Re: Justifying Optimization

"Jan C. =?iso-8859-1?Q?Vorbr=FCggen?=" <jvorbrueggen@mediasec.de>
25 Jan 2003 01:03:56 -0500

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From: "Jan C. =?iso-8859-1?Q?Vorbr=FCggen?=" <jvorbrueggen@mediasec.de>
Newsgroups: comp.compilers
Date: 25 Jan 2003 01:03:56 -0500
Organization: MediaSec Technologies GmbH
References: 03-01-088 03-01-108
Keywords: optimize, arithmetic, testing
Posted-Date: 25 Jan 2003 01:03:56 EST

> We do hear this argument from developers working on floating point
> intensive code. The optimized program may produce results that
> differ from the unoptimized program by a very "small" amount. If all
> the test suite is does is a textual diff against masters generated
> by an unoptimized run, then many spurious failures may show up,
> forcing the developers to eyeball the results.


Then specdiff, from the SPEC CPU2000 benchmark, will be your
friend. See John Henning's article in IEEE COMPUTER (sometime in
mid-2000, IIRC) on what it does and why.


Jan

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