(j3.2006) parameterized derived types

[Tom Clune]

> On Dec 11, 2015, at 12:53 AM, Keith Bierman <khbkhb at gmail.com> wrote:
> 
>> , as a user, I would have little sympathy for another user that fell into this abyss. 
> 
> If the application runs on a mix of processors, say GPUs and x64 and power processors won?t it be fairly easy to fall into the trap (we set by allowing fp  in these contexts)?

I await a plausible example.  Certainly it is easy to create an artificial example, but using FP operations to determine array lengths is vanishingly rare in my experience.    And I don?t dispute that exotic HW would make it easier to demonstrate the problem.   And if the expression is vulnerable to roundoff, it begs the question as to what the intent really was.

Note.  I?m not denying the possibility that someone will show me a plausible example.  And, I?m fully ready to reverse my position as a consequence.   I suppose mostly, I?m challenging others to come up with that plausible example.

Cheers,

- Tom


> 
> khbkhb at gmail.com <mailto:khbkhb at gmail.com> | kbiermank (AIM) | khbkhb123 at icloud.com <mailto:khbkhb123 at icloud.com> (iMessage)
> 
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Thomas Clune, Ph. D. 	<Thomas.L.Clune at nasa.gov>
Software Infrastructure Team Lead
Global Modeling and Assimilation Office, Code 610.1
NASA GSFC		
MS 610.1 B33-C128
Greenbelt, MD 20771
301-286-4635













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