From: Ken Garlington <garlingtonke@lmtas.lmco.com>
Subject: Re: Ariane 5 failure
Date: 1996/10/21
Date: 1996-10-21T00:00:00+00:00 [thread overview]
Message-ID: <326BAB1F.BB@lmtas.lmco.com> (raw)
In-Reply-To: 3267D929.167E@gsde.hso.link.com
Samuel T. Harris wrote:
>
> 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.
> >
>
> Remember, the report does NOT state that an unchecked_conversion
> was used (as some on this thread have assumed). It only states
> a "data conversion from 64-bit floating point to 16-bit signed
> integer value". As someone (I forget who) pointed out early
> in the thread weeks ago, a standard practice is to scale down
> the range of a float value to fit into an integer variable.
> This may not have been an unchecked_conversion at all, but
> some mathimatical expression.
In fact, I would be very surprised if unchecked_conversion was used.
It wouldn't make much sense to convert from float to fixed using UC.
More than likely, the constraint error/hardware interrupt was raised
due to an overflow of the 16-bit value during the type conversion part
of the scaling equation.
--
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next prev parent reply other threads:[~1996-10-21 0:00 UTC|newest]
Thread overview: 105+ messages / expand[flat|nested] mbox.gz Atom feed top
1996-10-01 0:00 Ariane 5 failure Marin David Condic, 407.796.8997, M/S 731-93
1996-10-02 0:00 ` Matthew Heaney
1996-10-04 0:00 ` Ken Garlington
1996-10-05 0:00 ` Robert Dewar
1996-10-06 0:00 ` Keith Thompson
1996-10-08 0:00 ` Bullet-Proof or Bullet-Resistant (Was Ariane 5 failure) Alan Brain
1996-10-10 0:00 ` Ariane 5 failure Ken Garlington
1996-10-14 0:00 ` Matthew Heaney
1996-10-15 0:00 ` Robert Dewar
1996-10-16 0:00 ` Ken Garlington
1996-10-18 0:00 ` Keith Thompson
1996-10-18 0:00 ` Samuel T. Harris
1996-10-21 0:00 ` Ken Garlington [this message]
1996-10-18 0:00 ` Ken Garlington
1996-10-23 0:00 ` robin
1996-10-02 0:00 ` Robert I. Eachus
1996-10-02 0:00 ` Ken Garlington
-- strict thread matches above, loose matches on Subject: below --
1996-10-31 0:00 Marin David Condic, 561.796.8997, M/S 731-93
1996-10-28 0:00 Marin David Condic, 561.796.8997, M/S 731-93
1996-10-28 0:00 Marin David Condic, 561.796.8997, M/S 731-93
1996-10-29 0:00 ` Ken Garlington
1996-11-08 0:00 ` robin
1996-10-21 0:00 Marin David Condic, 407.796.8997, M/S 731-93
1996-10-22 0:00 ` Adam Beneschan
1996-10-16 0:00 Marin David Condic, 407.796.8997, M/S 731-93
1996-10-18 0:00 ` Ken Garlington
1996-10-19 0:00 ` Frank Manning
1996-10-21 0:00 ` Norman H. Cohen
1996-10-14 0:00 Marin David Condic, 407.796.8997, M/S 731-93
1996-10-15 0:00 ` Robert I. Eachus
1996-10-15 0:00 ` Robert Dewar
1996-10-16 0:00 ` Michael F Brenner
1996-10-16 0:00 ` Robert Dewar
1996-10-23 0:00 ` robin
1996-10-03 0:00 Marin David Condic, 407.796.8997, M/S 731-93
1996-10-03 0:00 Marin David Condic, 407.796.8997, M/S 731-93
1996-10-03 0:00 Marin David Condic, 407.796.8997, M/S 731-93
1996-10-01 0:00 Marin David Condic, 407.796.8997, M/S 731-93
1996-10-02 0:00 ` Alan Brain
1996-10-02 0:00 ` Ken Garlington
1996-10-02 0:00 ` Matthew Heaney
1996-10-04 0:00 ` Robert S. White
1996-10-05 0:00 ` Alan Brain
1996-10-06 0:00 ` Robert S. White
1996-10-05 0:00 ` Robert Dewar
1996-10-03 0:00 ` Alan Brain
1996-10-04 0:00 ` Ken Garlington
1996-10-01 0:00 Marin David Condic, 407.796.8997, M/S 731-93
1996-10-02 0:00 ` Ken Garlington
[not found] <agrapsDy4oJH.29G@netcom.com>
1996-09-25 0:00 ` @@ robin
1996-09-25 0:00 ` Bob Kitzberger
1996-09-26 0:00 ` Ronald Kunne
1996-09-26 0:00 ` Matthew Heaney
1996-09-27 0:00 ` Wayne Hayes
1996-09-27 0:00 ` Richard Pattis
1996-09-29 0:00 ` Chris McKnight
1996-09-29 0:00 ` Alan Brain
1996-09-29 0:00 ` Dann Corbit
1996-10-01 0:00 ` Ken Garlington
1996-09-27 0:00 ` Ronald Kunne
1996-09-27 0:00 ` Lawrence Foard
1996-10-04 0:00 ` @@ robin
1996-09-28 0:00 ` Ken Garlington
1996-09-28 0:00 ` Ken Garlington
1996-09-29 0:00 ` Alan Brain
1996-09-29 0:00 ` Robert A Duff
1996-09-30 0:00 ` Wayne L. Beavers
1996-10-01 0:00 ` Ken Garlington
1996-10-01 0:00 ` Wayne L. Beavers
1996-10-01 0:00 ` Ken Garlington
1996-10-02 0:00 ` Sandy McPherson
1996-10-03 0:00 ` Richard A. O'Keefe
1996-10-01 0:00 ` Ken Garlington
1996-09-28 0:00 ` Ken Garlington
1996-09-27 0:00 ` Alan Brain
1996-09-28 0:00 ` Ken Garlington
1996-09-27 0:00 ` Ken Garlington
1996-09-29 0:00 ` Louis K. Scheffer
1996-09-25 0:00 ` Michel OLAGNON
1996-09-25 0:00 ` Chris Morgan
1996-09-25 0:00 ` Byron Kauffman
1996-09-25 0:00 ` A. Grant
1996-09-25 0:00 ` Ken Garlington
1996-09-26 0:00 ` Byron Kauffman
1996-09-27 0:00 ` A. Grant
1996-09-26 0:00 ` Sandy McPherson
1996-09-27 0:00 ` John McCabe
1996-10-01 0:00 ` Michael Dworetsky
1996-10-04 0:00 ` Steve Bell
1996-10-07 0:00 ` Ken Garlington
1996-10-09 0:00 ` @@ robin
1996-10-09 0:00 ` Steve O'Neill
1996-10-12 0:00 ` Alan Brain
1996-10-04 0:00 ` @@ robin
1996-10-04 0:00 ` Michel OLAGNON
1996-10-09 0:00 ` @@ robin
1996-10-04 0:00 ` Joseph C Williams
1996-10-06 0:00 ` Wayne Hayes
1996-10-17 0:00 ` Ralf Tilch
1996-10-17 0:00 ` Ravi Sundaram
1996-10-22 0:00 ` shmuel
1996-10-22 0:00 ` Jim Carr
1996-10-24 0:00 ` hayim
1996-10-25 0:00 ` Ken Garlington
1996-10-25 0:00 ` Michel OLAGNON
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