From: Pascal MALAISE <malaise@magic.fr>
Subject: Re: Need exception despite Machine_Overflows is false
Date: 1998/12/18
Date: 1998-12-18T19:12:58+00:00 [thread overview]
Message-ID: <367AA93A.3F8F1506@magic.fr> (raw)
In-Reply-To: ug1ad8kyo.fsf@gsfc.nasa.gov
Stephen Leake wrote:
> You could try adding a range constraint to your basic floating point type:
>
> type Real is digits 9 range -1.0e307 .. +1.0e307;
Fortunately I already had good "float" programming policy, I used:
subtype REAL is LONG_FLOAT;
Now, with: type REAL is digits 17 range -1.5E308 .. 1.5E308;
I just need to add some use clauses for the stuff to compile.
> As long as your limits are tighter than the machine limits, the
> compiler will insert explicit checks.
The detection is done now!
> Of course, this will slow things down,
it is not significant
> but I assume you could remove the limits after you find the bug.
Oh, I was not looking for a bug.
The program makes pure mattrix multiplications and all I need is raising
then
handling the exception.
> This is one reason not to use the predefined Float type!
I knew some other reasons but not this one.
Thank's very much.
--
Pascal MALAISE
(priv) mailto:malaise@magic.fr
(prof) mailto:malaise@fr.airsysatm.thomson-csf.com
next prev parent reply other threads:[~1998-12-18 0:00 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
1998-12-17 0:00 Need exception despite Machine_Overflows is false Pascal MALAISE
1998-12-17 0:00 ` Matthew Heaney
1998-12-18 0:00 ` dewarr
1998-12-18 0:00 ` Matthew Heaney
1998-12-19 0:00 ` dewar
1998-12-18 0:00 ` Stephen Leake
1998-12-18 0:00 ` Matthew Heaney
1998-12-18 0:00 ` Pascal MALAISE [this message]
1998-12-19 0:00 ` dewarr
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