Re: Compiler optimization and floating point operations

George Neuner <gneuner2@comcast.net>
Thu, 24 Oct 2013 15:51:08 -0400

          From comp.compilers
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| List of all articles for this month |
From: George Neuner <gneuner2@comcast.net>
Newsgroups: comp.compilers
Date: Thu, 24 Oct 2013 15:51:08 -0400
Organization: A noiseless patient Spider
References: 13-10-026 13-10-029
Keywords: arithmetic, administrivia
Posted-Date: 24 Oct 2013 16:44:39 EDT

On Thu, 24 Oct 2013 07:41:12 -0400, George Neuner
<gneuner2@comcast.net> wrote:


>Floating point operations, in general, are not commutative: changing
>the order of evaluation of sub-expressions can change the results.


John replied:
>[I think you mean they're not associative. I don't know any situations
>where a+b != b+a, but lots where a+(b+c) != (a+b)+c -John]


Yes, definitely "associative". Thanks for the correction.
George


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