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digitalmars.D.bugs - [Issue 6303] New: Order of float declaration changes NaN throwing behavior

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=6303

           Summary: Order of float declaration changes NaN throwing
                    behavior
           Product: D
           Version: D2
          Platform: Other
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: andrej.mitrovich gmail.com



17:23:32 PDT ---
import std.math;
void main()
{
   float foo;
   FloatingPointControl fpc;
   fpc.enableExceptions(FloatingPointControl.allExceptions);

   //~ float foo;
   auto x = foo / 0;
}

This won't throw unless you replace the first foo declaration with the second
one. This only happens with NaNs. If you initialize the float and do an invalid
operation then it throws:

import std.math;
void main()
{
   float foo = 0.0f;  // initialize it first
   FloatingPointControl fpc;
   fpc.enableExceptions(FloatingPointControl.allExceptions);

   auto x = foo / 0;  // throws, as it should
}

So this odd behavior only happens with NaNs.

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parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=6303


Don <clugdbug yahoo.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |DUPLICATE



This is a symptom of bug 9813.

*** This issue has been marked as a duplicate of issue 9813 ***

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Jul 26 2013