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Extension to iso_fortran_env

 
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arctica



Joined: 10 Sep 2006
Posts: 105
Location: United Kingdom
PostPosted: Sun Dec 24, 2023 5:15 pm    Post subject: Extension to iso_fortran_env Reply with quote
Hello.

There does not appear to be support for ieee_arithmetic in the current ftn95 e.g.

Code:

program ieee
    use, intrinsic :: iso_fortran_env, only: wp=>real64
    use, intrinsic :: ieee_arithmetic
    implicit none

    print *, ieee_value(1.0_wp, ieee_positive_inf)
    print *, ieee_value(1.0_wp, ieee_negative_inf)
end program ieee


This might be handy to have in a future release to deal better with coding infinity into mathematical functions. For infinity I just set a very large number as a break point.

Lester
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PaulLaidler
Site Admin


Joined: 21 Feb 2005
Posts: 7926
Location: Salford, UK
PostPosted: Wed Dec 27, 2023 9:23 am    Post subject: Reply with quote
Lester

Thank you for the feedback. I have made a note of your suggestion.

This is a part of the 2003 Standard that has not yet been implemented in FTN95.

At the moment computing z = 0.0 then v = 1.0/z will raise a runtime time exception as will v = z/z. This default exception handling will need to be changed when implementing the ieee_arithmetic module and this could be unsafe if the programmer is not fully aware if the implications.
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