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Re: Would you consider this a bug? [message #13040 is a reply to message #12982]

Mon, 05 October 1998 00:00

David Kastrup
Messages: 33
Registered: February 1998

Member

muswick@uhrad.com writes:

> Actually I don't think it is a bug. One needs to carefully review
> how IDL handles arrays and indices.

An artifact not mentioned in the language description is a bug.
Imagining how this bug might come about does not make it go away.

> If we go back to the original posted question:
>
>> a = [3,4,5]
>> a[[2,1,0]] = a
>
>> a will be set to [3,4,3]
>
> Which is correct, based on 'a' being overwritten. This is avoid huge memory
> overhead in many cases where the right side equation is complex.

It is a reasonable optimization in general, but an optimization that
changes the results of the command is a bug. Being able to understand
how this bug comes about does not make it "correct". IDL needs to
find out where this optimization is inappropriate and not do it where
harm does ensue.

You cannot define correctness of a program based on the artifacts of
some optimizer. An optimizer has to work behind the scenes.

--
David Kastrup Phone: +49-234-700-5570
Email: dak@neuroinformatik.ruhr-uni-bochum.de Fax: +49-234-709-4209
Institut fï¿½r Neuroinformatik, Universitï¿½tsstr. 150, 44780 Bochum, Germany

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[Message index]

		Would you consider this a bug? By: David Kastrup on Wed, 30 September 1998 00:00
		Re: Would you consider this a bug? By: David Kastrup on Mon, 05 October 1998 00:00
		Re: Would you consider this a bug? By: muswick on Sat, 03 October 1998 00:00
		Re: Would you consider this a bug? By: Martin Schultz on Fri, 02 October 1998 00:00
		Re: Would you consider this a bug? By: David Kastrup on Thu, 01 October 1998 00:00
		Re: Would you consider this a bug? By: korpela on Thu, 01 October 1998 00:00
		Re: Would you consider this a bug? By: Kevin Ivory on Thu, 01 October 1998 00:00
		Re: Would you consider this a bug? By: David Kastrup on Thu, 01 October 1998 00:00
		Re: Would you consider this a bug? By: Kevin Ivory on Thu, 01 October 1998 00:00

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