[ET Trac] [Einstein Toolkit] #1911: Hydro_InitExcision sphere_pugh_ppm test fails

Einstein Toolkit trac-noreply at einsteintoolkit.org
Mon Jun 6 15:41:09 CDT 2016

#1911: Hydro_InitExcision sphere_pugh_ppm test fails
  Reporter:  barry.wardell  |       Owner:                     
      Type:  defect         |      Status:  reopened           
  Priority:  unset          |   Milestone:                     
 Component:  Other          |     Version:  development version
Resolution:                 |    Keywords:                     
Changes (by eschnett):

  * status:  closed => reopened
  * resolution:  invalid =>


 It should not be necessary to avoid {{{-ffast-math}}} to make the tests
 pass. In Cactus, we have always taken the approach that the order in which
 floating-point expressions are evaluated should not matter, and that we do
 not want to rely on IEEE semantics when it comes to NaN (or similar
 exceptional values).

 While it would be nice to use this part of the standard, it (a) slows
 things down considerably, and (b) the standard doesn't guarantee bitwise
 identical results anyway.

Ticket URL: <https://trac.einsteintoolkit.org/ticket/1911#comment:4>
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