From: Robert Dewar <robert_dewar@my-deja.com>
Subject: Re: Ada and Java. different behaviour. casting long to int problem.
Date: 1999/06/12
Date: 1999-06-12T00:00:00+00:00 [thread overview]
Message-ID: <7ju351$d7u$1@nnrp1.deja.com> (raw)
In-Reply-To: FD7nFF.6D@stuyts.nl
In article <FD7nFF.6D@stuyts.nl>,
jerry@jvdsys.stuyts.nl wrote:
> nabbasi@pacbell.net.NOSPAM wrote:
>
> The super-secret GNAT documentation will tell you that this is
> a very
> expensive check to perform, so it is by default disabled.
The very here is Jerry's invention :-)
The actual quote from the documentation is:
We treat integer overflow specially
because these are quite expensive and in our experience are
not as important as other run-time checks in the development
process.
and the "quite" here is probably right. We have in fact steadily
improved the quality of code for -gnato, so the penalty has been
reduced. It would be interesting to know what actual programs
see as a result of -gnato being off or on.
Note that the reason that overflow checking is rather different
from other checks is that it does not introduce safety issues.
You may get unexpected (e.g. modular wrapped) values, but you
don't get wild jumps, loads or stores as a result of overflow
checking being off.
> -- Jerry van Dijk | Leiden, Holland
> -- Team Ada | jdijk@acm.org
> -- see http://stad.dsl.nl/~jvandyk
>
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next prev parent reply other threads:[~1999-06-12 0:00 UTC|newest]
Thread overview: 120+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-06-12 0:00 Ada and Java. different behaviour. casting long to int problem nabbasi
1999-06-12 0:00 ` Tucker Taft
1999-06-12 0:00 ` PPAATT
1999-06-12 0:00 ` Keith Thompson
1999-06-12 0:00 ` kirck
1999-06-13 0:00 ` Robert Dewar
1999-06-12 0:00 ` Fred
1999-06-14 0:00 ` Mark Hood
1999-06-15 0:00 ` mike
1999-06-15 0:00 ` Samuel Mize
1999-06-15 0:00 ` jerry
1999-06-16 0:00 ` Richard D Riehle
1999-06-16 0:00 ` jerry
1999-06-15 0:00 ` Marin David Condic
1999-06-15 0:00 ` Mike Silva
1999-06-15 0:00 ` rich
1999-06-15 0:00 ` tmoran
1999-06-15 0:00 ` David Botton
1999-06-16 0:00 ` Richard D Riehle
1999-06-16 0:00 ` Samuel Mize
1999-06-15 0:00 ` Marin David Condic
1999-06-15 0:00 ` D'Arcy Smith
1999-06-15 0:00 ` Keith Thompson
1999-06-16 0:00 ` D'Arcy Smith
1999-06-16 0:00 ` bill
1999-06-16 0:00 ` George W. Bayles
1999-06-16 0:00 ` Fraser Wilson
1999-06-17 0:00 ` Chris Dollin
1999-06-17 0:00 ` Aidan Skinner
1999-06-17 0:00 ` David Botton
1999-06-18 0:00 ` Dale Stanbrough
1999-06-18 0:00 ` Matthew Heaney
1999-06-18 0:00 ` David Botton
1999-06-18 0:00 ` Pascal Obry
1999-07-20 0:00 ` Geoff Bull
1999-06-16 0:00 ` Mike Silva
1999-06-16 0:00 ` D'Arcy Smith
1999-06-16 0:00 ` kirk
1999-06-16 0:00 ` Hyman Rosen
1999-06-17 0:00 ` Markus Kuhn
1999-06-17 0:00 ` Jean-Pierre Rosen
1999-06-17 0:00 ` Marin David Condic
1999-06-17 0:00 ` Samuel Mize
1999-06-17 0:00 ` Marin David Condic
1999-06-22 0:00 ` Hyman Rosen
1999-06-22 0:00 ` Keith Thompson
1999-06-23 0:00 ` Marin David Condic
1999-06-24 0:00 ` Robert A Duff
1999-06-24 0:00 ` Marin David Condic
1999-06-23 0:00 ` Marin David Condic
1999-06-18 0:00 ` Aidan Skinner
1999-06-17 0:00 ` Robert I. Eachus
1999-06-17 0:00 ` Hyman Rosen
1999-06-17 0:00 ` bob
1999-06-18 0:00 ` Hyman Rosen
1999-06-18 0:00 ` mike
1999-06-18 0:00 ` Hyman Rosen
1999-06-19 0:00 ` Samuel Mize
1999-06-21 0:00 ` Marin David Condic
1999-06-19 0:00 ` Dale Stanbrough
1999-06-21 0:00 ` Marin David Condic
1999-06-21 0:00 ` Mike Silva
1999-06-17 0:00 ` Marin David Condic
1999-06-20 0:00 ` Sera Hirasuna
1999-06-19 0:00 ` Kio
1999-06-20 0:00 ` Vladimir Olensky
1999-06-21 0:00 ` Hyman Rosen
1999-06-21 0:00 ` Samuel T. Harris
1999-06-22 0:00 ` Richard D Riehle
1999-06-22 0:00 ` Robert I. Eachus
1999-06-23 0:00 ` Aidan Skinner
1999-06-23 0:00 ` Richard D Riehle
1999-06-16 0:00 ` D'Arcy Smith
1999-06-17 0:00 ` Markus Kuhn
1999-06-17 0:00 ` john
1999-06-17 0:00 ` Ed Falis
1999-06-18 0:00 ` Aidan Skinner
1999-06-17 0:00 ` D'Arcy Smith
1999-06-17 0:00 ` Jean-Pierre Rosen
1999-06-16 0:00 ` Marin David Condic
1999-06-16 0:00 ` George W. Bayles
1999-06-16 0:00 ` D'Arcy Smith
1999-06-16 0:00 ` Tucker Taft
1999-06-17 0:00 ` George W. Bayles
1999-06-17 0:00 ` Tucker Taft
1999-06-17 0:00 ` bob
1999-06-16 0:00 ` D'Arcy Smith
1999-06-17 0:00 ` Larry Kilgallen
1999-06-22 0:00 ` Robert Dewar
1999-06-23 0:00 ` Marin David Condic
1999-06-23 0:00 ` Vladimir Olensky
1999-06-23 0:00 ` Marin David Condic
1999-06-23 0:00 ` Roedy Green
1999-06-23 0:00 ` Marin David Condic
1999-06-23 0:00 ` Keith Thompson
1999-06-24 0:00 ` Marin David Condic
1999-06-24 0:00 ` Mike Silva
1999-06-15 0:00 ` Samuel Mize
1999-06-16 0:00 ` Mark Hood
1999-06-17 0:00 ` Jean-Pierre Rosen
1999-06-17 0:00 ` Robert I. Eachus
1999-06-17 0:00 ` Marin David Condic
1999-06-15 0:00 ` D'Arcy Smith
1999-06-16 0:00 ` George W. Bayles
1999-06-16 0:00 ` D'Arcy Smith
1999-06-17 0:00 ` Aidan Skinner
1999-06-17 0:00 ` Matthew Heaney
1999-06-17 0:00 ` Markus Kuhn
1999-06-17 0:00 ` David Botton
1999-06-13 0:00 ` Robert Dewar
1999-06-14 0:00 ` tmoran
1999-06-30 0:00 ` John Merryweather Cooper
1999-07-01 0:00 ` Chad R. Meiners
1999-07-02 0:00 ` Robert Dewar
1999-07-02 0:00 ` John Merryweather Cooper
1999-07-03 0:00 ` Robert Dewar
1999-06-12 0:00 ` nabbasi
1999-06-12 0:00 ` jerry
1999-06-12 0:00 ` Robert Dewar [this message]
1999-06-14 0:00 ` Marin David Condic
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