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From: "Steve Doiel" <nospam_steved94@attbi.com>
Newsgroups: comp.lang.ada
Subject: Valid on QNaN generates exception, compiler bug?
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Xref: archiver1.google.com comp.lang.ada:19407
Date: 2002-01-31T04:04:45+00:00
List-Id: <comp.lang.ada>

  In ObjectAda 7.2 (WinNT x86) I have found that if I assign a value of
16#FFC0_0000# (QNaN) to a 32 bit floating point value using unchecked
conversion, then I try to check the value using 'VALID, I get a
Constraint_Error, numeric overflow exception.

  Is this a compiler bug?

  To paraphrase

  FUNCTION Conv IS
    NEW Ada.Unchecked_Conversion( Unsigned_32, float );

 ...
  float_value : Float;
  u32_value : Unsigned_Float;
...
  u32_value := 16#FFC0_0000#;
  float_value := Conv( u32_value );
  IF float_value'VALID THEN           -- The exception occurs on this line
    Text_Io.Put_Line( "Value is valid" );
  ELSE
    Text_Io.Put_Line( "Value is not valid" );
  END IF;

BTW: Gnat 3.13p with -gnato does not raise an exception.

Thanks,
SteveD