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Re: Compiler optimization and floating point operations

From George Neuner <gneuner2@comcast.net>
Newsgroups comp.compilers
Subject Re: Compiler optimization and floating point operations
Date 2013-10-24 15:51 -0400
Organization A noiseless patient Spider
Message-ID <13-10-033@comp.compilers> (permalink)
References <13-10-026@comp.compilers> <13-10-029@comp.compilers>

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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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Thread

Compiler optimization and floating point operations Abid <abidmuslim@gmail.com> - 2013-10-23 13:47 -0700
  Re: Compiler optimization and floating point operations Cameron McInally <cameron.mcinally@nyu.edu> - 2013-10-23 22:55 -0400
  Re: Compiler optimization and floating point operations glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2013-10-24 02:56 +0000
  Re: Compiler optimization and floating point operations George Neuner <gneuner2@comcast.net> - 2013-10-24 07:41 -0400
    Re: Compiler optimization and floating point operations Jean-Marc Bourguet <jm@bourguet.org> - 2013-10-24 15:51 +0200
    Re: Compiler optimization and floating point operations "Steven G. Kargl" <sgk@troutmask.apl.washington.edu> - 2013-10-24 16:38 +0000
      Re: Compiler optimization and floating point operations christian.bau@cbau.wanadoo.co.uk - 2013-10-28 15:54 -0700
    Re: Compiler optimization and floating point operations George Neuner <gneuner2@comcast.net> - 2013-10-24 15:51 -0400
    Re: Compiler optimization and floating point operations glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2013-10-24 20:21 +0000
    Re: Compiler optimization and floating point operations christian.bau@cbau.wanadoo.co.uk - 2013-10-28 15:50 -0700
      Re: Compiler optimization and floating point operations Cameron McInally <cameron.mcinally@nyu.edu> - 2013-10-28 20:41 -0400

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