From: Pascal Obry <p.obry@wanadoo.fr>
Subject: Re: What is faster Ada or C?
Date: 02 Dec 2001 11:44:08 +0100
Date: 2001-12-02T10:46:30+00:00 [thread overview]
Message-ID: <uzo51c35z.fsf@wanadoo.fr> (raw)
In-Reply-To: 3C09B2D6.663C10BD@acm.org
Jeffrey Carter <jrcarter@acm.org> writes:
> Heiko Hamann wrote:
> >
> > Well, _any_ difference? Hey, this is unbelievable! The difference between
> > the program compiled with
> > standard options and the program compiled with -gnatp and -O3 is terrific.
> > The acceleration is about 70%! The new compilation needs only about 1/4 of
> > time the old one needed. I can't believe it.
> > The new program is about 1/5 smaller than the old one.
>
> Most of this difference is probably due to optimization. GNAT produces
> very poor code with no optimization. Even -O1 often makes a significant
Indeed. The -O0 (default option) of GCC/GNAT is doing just no optimization at
all. It even does not try to be smart :)
The first "real" optimization steps for GCC/GNAT is done at -02.
Pascal.
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next prev parent reply other threads:[~2001-12-02 10:44 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-12-01 1:22 What is faster Ada or C? Heiko Hamann
2001-12-01 1:43 ` Aaro Koskinen
2001-12-03 8:49 ` John McCabe
2001-12-04 23:00 ` Florian Weimer
2001-12-05 15:53 ` Ted Dennison
2001-12-06 0:17 ` Jeffrey Carter
2001-12-10 15:18 ` Dale Pontius
2001-12-10 17:44 ` Pascal Obry
2001-12-01 3:44 ` Nick Roberts
2001-12-01 20:09 ` Heiko Hamann
2001-12-02 4:49 ` Jeffrey Carter
2001-12-02 10:44 ` Pascal Obry [this message]
2001-12-04 11:43 ` john mann
2001-12-04 14:25 ` Ted Dennison
2001-12-05 9:46 ` John McCabe
2001-12-02 10:07 ` Mark Lundquist
2001-12-03 14:43 ` Ted Dennison
2001-12-09 12:31 ` Robert Dewar
2001-12-01 9:26 ` Gisle Sælensminde
2001-12-01 10:13 ` Pascal Obry
2001-12-02 17:49 ` Bertrand Augereau
2001-12-03 14:39 ` Ted Dennison
2001-12-03 16:19 ` Jeffrey Carter
2001-12-03 19:04 ` Ted Dennison
2001-12-03 20:56 ` Georg Bauhaus
2001-12-03 21:17 ` Preben Randhol
2001-12-03 21:20 ` Preben Randhol
2001-12-04 23:02 ` Florian Weimer
2001-12-05 16:05 ` Georg Bauhaus
2001-12-06 23:33 ` Florian Weimer
2001-12-04 2:35 ` Jeffrey Carter
2001-12-04 6:54 ` Steven Deller
2001-12-04 22:05 ` Bertrand Augereau
2001-12-06 4:25 ` Richard Riehle
2001-12-07 20:02 ` Hyman Rosen
2001-12-09 19:32 ` Richard Riehle
2001-12-11 16:14 ` Hyman Rosen
2001-12-14 0:36 ` Will
2001-12-19 22:23 ` Hyman Rosen
2001-12-17 17:37 ` Richard Riehle
2001-12-20 23:02 ` Hyman Rosen
2001-12-23 4:12 ` Will
2001-12-23 6:41 ` James Rogers
2001-12-04 22:37 ` Pascal Obry
2001-12-05 15:57 ` Georg Bauhaus
2001-12-05 17:12 ` Larry Kilgallen
2001-12-07 13:21 ` Jacob Sparre Andersen
2001-12-07 15:16 ` Aaro Koskinen
2001-12-07 16:50 ` Preben Randhol
2001-12-07 17:03 ` Jacob Sparre Andersen
2001-12-07 17:26 ` Aaro Koskinen
2001-12-07 18:32 ` Preben Randhol
2001-12-07 20:23 ` Wes Groleau
2001-12-07 17:11 ` Ted Dennison
2001-12-07 18:47 ` Preben Randhol
2001-12-07 16:16 ` Preben Randhol
2001-12-07 17:04 ` Jacob Sparre Andersen
2001-12-07 16:26 ` Ted Dennison
2001-12-07 17:08 ` Jacob Sparre Andersen
2001-12-09 12:27 ` Robert Dewar
2001-12-10 16:51 ` Jacob Sparre Andersen
2001-12-10 17:33 ` Jeff Creem
2001-12-07 16:45 ` Georg Bauhaus
2001-12-07 17:02 ` Preben Randhol
2001-12-07 17:10 ` Jacob Sparre Andersen
2001-12-07 18:12 ` Pascal Obry
2001-12-07 18:50 ` Preben Randhol
2001-12-07 18:54 ` Pascal Obry
2001-12-07 20:40 ` Preben Randhol
2001-12-07 22:01 ` Pascal Obry
2001-12-07 18:19 ` Jeffrey Carter
2001-12-10 9:59 ` Ole-Hjalmar Kristensen
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2001-12-02 19:37 Gautier Write-only-address
2001-12-23 10:33 Gautier Write-only-address
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