[ET Trac] [Einstein Toolkit] #1563: Provide always-working isnan etc.

[Einstein Toolkit]

#1563: Provide always-working isnan etc.
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  Reporter:  eschnett     |       Owner:                     
      Type:  enhancement  |      Status:  reopened           
  Priority:  major        |   Milestone:                     
 Component:  Cactus       |     Version:  development version
Resolution:               |    Keywords:                     
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Changes (by rhaas):

  * status:  review => reopened


Comment:

 This is becoming ridiculous. I'd consider optimizing out an explicit call
 to isnan() a compiler bug. Is there a compiler option to turn those back
 on maybe?

 Otherwise, fine with me, if this is what it takes. I'd even consider
 having CCTK's isnan function (which we *already* provide since the C++
 math is inconsistent between compilers) man to CCTK_IEEEisnan. Do we have
 any idea if/how much using the home-brew CCTK_IEEEIsnan is slower than
 using (a properly functioning of course) isnan (I expect the later to be a
 single machine instruction)?

 The patch as is lacks support for float which is useful if CCTK_REAL is a
 4 byte float rather than the 8 byte double (and also lacks support for
 long double).

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1563#comment:2>
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