Re: Ariane 5 failure

[Ken Garlington <garlingtonke@lmtas.lmco.com>]

Keith Thompson wrote:
> 
> In <326506D2.1E40@lmtas.lmco.com> Ken Garlington <garlingtonke@lmtas.lmco.com> writes:
> [...]
> > Not necessarily. Keep in mind that an exception _was_ raised -- a
> > predefined exception (Operand_Error according to the report).
> 
> This is one thing that's confused me about this report.  There is no
> predefined exception in Ada called Operand_Error.  Either the overflow
> raised Constraint_Error (or Numeric_Error if they were using an Ada
> 83 compiler that doesn't follow AI-00387), or a user-defined exception
> called Operand_Error was raised explicitly.

It confused me too. I'm guessing that language differences are part of the
answer here, but I have no idea. It's also possible that the CPU hardware
specification has something called an "Operand Error" interrupt which is
generated during an overflow, which I assume gets mapped into Constraint_Error
(as is common with the MIL-STD-1750 CPU, for instance).

I also world be interested in any information about "Operand_Error".

> 
> --
> Keith Thompson (The_Other_Keith) kst@thomsoft.com <*>
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