Compiler optimization and floating point operations

Abid <abidmuslim@gmail.com>
Wed, 23 Oct 2013 13:47:10 -0700 (PDT)

          From comp.compilers
Related articles
Compiler optimization and floating point operations abidmuslim@gmail.com (Abid) (2013-10-23)
Re: Compiler optimization and floating point operations cameron.mcinally@nyu.edu (Cameron McInally) (2013-10-23)
Re: Compiler optimization and floating point operations gah@ugcs.caltech.edu (glen herrmannsfeldt) (2013-10-24)
Re: Compiler optimization and floating point operations gneuner2@comcast.net (George Neuner) (2013-10-24)
Re: Compiler optimization and floating point operations jm@bourguet.org (Jean-Marc Bourguet) (2013-10-24)
Re: Compiler optimization and floating point operations sgk@troutmask.apl.washington.edu (Steven G. Kargl) (2013-10-24)
Re: Compiler optimization and floating point operations gneuner2@comcast.net (George Neuner) (2013-10-24)
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From: Abid <abidmuslim@gmail.com>
Newsgroups: comp.compilers
Date: Wed, 23 Oct 2013 13:47:10 -0700 (PDT)
Organization: Compilers Central
Keywords: arithmetic, optimize, question
Posted-Date: 23 Oct 2013 21:09:45 EDT

Hi All:


Does back end compiler optimizations affect the floating point
accuracy? Is there any research work in this area?


Thanks,


Abid


[The answer to the first question is "sometimes", and there has been a
great deal of work in this area going back to the 1960s. I know IBM
Fortran compilers that carefully preserve bit identical results in
regular and optimized code, and I know other compilers that freely
use all of the mathematical (but not arithmetic) equivalences that
Fortran allows. -John]


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