Wed, 23 Oct 2013 22:55:58 -0400

Related articles |
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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) |

Re: Compiler optimization and floating point operations gah@ugcs.caltech.edu (glen herrmannsfeldt) (2013-10-24) |

[3 later articles] |

From: | Cameron McInally <cameron.mcinally@nyu.edu> |

Newsgroups: | comp.compilers |

Date: | Wed, 23 Oct 2013 22:55:58 -0400 |

Organization: | Compilers Central |

References: | 13-10-026 |

Keywords: | arithmetic, optimize |

Posted-Date: | 24 Oct 2013 08:55:15 EDT |

Hey Abid,

On Wed, Oct 23, 2013 at 4:47 PM, Abid <abidmuslim@gmail.com> wrote:

*> Does back end compiler optimizations affect the floating point*

*> accuracy?*

Not all optimizations will affect floating point accuracy, but some

may. For example, an optimization that makes use of the associative

property or distributive property can have an impact. This is the

nature of the limited accuracy in floating point numbers.

Another common example is the use of FMA (Fused Multiply Add)

instructions. Although, using these instructions will most likely lead

to better accuracy, since there is only one rounding error applied to

the multiply and the add.

*> Is there any research work in this area?*

Yes, tons. Search for "floating point accuracy" and you will be sure

to find research going way back.

-Cameron

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