[Cfp-interest] Pole errors action item result

[Ian McIntosh]

It may be hard to detect an exact infinite result when using a non-IEEE
floating point implementation.

- Ian McIntosh          IBM Canada Lab         Compiler Back End Support
and Development



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  |Jim Thomas <jaswthomas at sbcglobal.net>                                                                                                     |
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  |Rajan Bhakta <rbhakta at us.ibm.com>,                                                                                                        |
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  |cfp-interest at oakapple.net                                                                                                                 |
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  |2014-04-09 08:31 AM                                                                                                                       |
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  |Re: [Cfp-interest] Pole errors action item result                                                                                         |
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  |cfp-interest-bounces at oakapple.net                                                                                                         |
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Hmm. The definition says

a pole error (also known as a singularity or infinitary) occurs if the
mathematical function has an exact infinite result as the finite input
argument(s) are approached in the limit (for example, log(0.0)

So pole errors occur. I guess what the committee means is the
implementation is not required to report them.

-Jim


On Apr 9, 2014, at 2:29 AM, Rajan Bhakta <rbhakta at us.ibm.com> wrote:

      With regards to my action item regarding why "may" is used for pole
      errors:

      Committee discussion: May is used since pole errors are not required
      to be present in C11.

      Regards,

      Rajan Bhakta
      z/OS XL C/C++ Compiler Technical Architect
      ISO C Standards Representative for Canada
      C Compiler Development
      Contact: rbhakta at us.ibm.com, Rajan Bhakta/Houston/IBM
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