From: eachus@spectre.mitre.org (Robert I. Eachus)
Subject: Re: Ariane 5 failure
Date: 1996/10/15
Date: 1996-10-15T00:00:00+00:00 [thread overview]
Message-ID: <EACHUS.96Oct15152359@spectre.mitre.org> (raw)
In-Reply-To: 96101416363982@psavax.pwfl.com
In article <96101416363982@psavax.pwfl.com> "Marin David Condic, 407.796.8997, M/S 731-93" <condicma@PWFL.COM> writes:
> In most of our work (control systems) it would be far more useful
> for math over/underflows to saturate and continue on, rather than
> raise an exception and halt processing. Ada never defined any
> numeric types with this sort of behavior - and I find it difficult
> to believe that many others in similar embedded applications
> wouldn't also desire this behavior from some predefined floating,
> fixed, and integer types. Of course, the language allows us to
> define our own types and (if there's proper hardware and compiler
> support for dealing with it) efficient "home-brew" solutions can
> be built. Still, it would have seemed appropriate for the language
> designers to have built some direct support for a very common
> embedded need.
They did. First look at 'Machine_Overflows. It is perfectly
legal for even Float'Machine_Overflows to be false and the
implementation to return, say IEEE nonsignaling NaNs in such a case.
Also RM95 3.5.5(26) and 3.5.6(8) allow for nonstandard integer and
real types respectively, and mention saturation types as one possible
use for the feature.
Talk to your vendor or check out what GNAT actually does on your
hardware.
--
Robert I. Eachus
with Standard_Disclaimer;
use Standard_Disclaimer;
function Message (Text: in Clever_Ideas) return Better_Ideas is...
next prev parent reply other threads:[~1996-10-15 0:00 UTC|newest]
Thread overview: 104+ messages / expand[flat|nested] mbox.gz Atom feed top
1996-10-14 0:00 Ariane 5 failure Marin David Condic, 407.796.8997, M/S 731-93
1996-10-15 0:00 ` Robert I. Eachus [this message]
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
-- 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
1996-10-03 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 ` Robert I. Eachus
1996-10-02 0:00 ` Ken Garlington
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
1996-10-10 0:00 ` 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
1996-10-18 0:00 ` Ken Garlington
1996-10-23 0:00 ` robin
1996-10-01 0:00 Marin David Condic, 407.796.8997, M/S 731-93
1996-10-02 0:00 ` Ken Garlington
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
[not found] <agrapsDy4oJH.29G@netcom.com>
1996-09-25 0:00 ` @@ robin
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
1996-09-25 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 ` Dann Corbit
1996-09-29 0:00 ` Alan Brain
1996-09-29 0:00 ` Chris McKnight
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
1996-09-27 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 ` Joseph C Williams
1996-10-06 0:00 ` Wayne Hayes
1996-10-04 0:00 ` Michel OLAGNON
1996-10-09 0:00 ` @@ robin
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 ` Michel OLAGNON
1996-10-25 0:00 ` Ken Garlington
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