From: reason67@my-deja.com
Subject: Re: Apex vs GNAT on solaris
Date: 1999/12/08
Date: 1999-12-08T00:00:00+00:00 [thread overview]
Message-ID: <82lcr0$tsg$1@nnrp1.deja.com> (raw)
In-Reply-To: 82ktik$j4c$1@nnrp1.deja.com
In article <82ktik$j4c$1@nnrp1.deja.com>,
Robert Dewar <robert_dewar@my-deja.com> wrote:
> It is completely meaningless to measure GNAT at -O0. The basic
> code generation technique used is designed to generate extremely
> inefficient code at this level, in a manner which is often hard
> to duplicate with a hand written code generator :-)
>
> From time to time we have discussed making the default -O2
> -gnatn, *precisely* so that naive benchmarks run with default
> options look better :-)
>
> Seriously, you have to decide what you are doing here. If
> you are measuring performance, then you need to make sure
> you are selecting comparable levels of optimization.
>
> If all you want to do is to find out the default options used
> for optimization, then it is more efficient to simply read the
> manuals to find this out, than to run meaningless comparisons
> of times.
BTW: Both compilers were set at no optimization.
---
Jeffrey S. Blatt
Sent via Deja.com http://www.deja.com/
Before you buy.
next prev parent reply other threads:[~1999-12-08 0:00 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-12-07 0:00 Apex vs GNAT on solaris reason67
1999-12-07 0:00 ` reason67
1999-12-07 0:00 ` Robert Dewar
1999-12-07 0:00 ` Roger Racine
1999-12-07 0:00 ` Jean-Pierre Rosen
1999-12-07 0:00 ` David Starner
1999-12-08 0:00 ` Robert Dewar
1999-12-07 0:00 ` Samuel T. Harris
1999-12-07 0:00 ` Larry Kilgallen
1999-12-08 0:00 ` Ted Dennison
1999-12-08 0:00 ` Robert Dewar
1999-12-08 0:00 ` Roger Racine
1999-12-08 0:00 ` Larry Kilgallen
1999-12-08 0:00 ` Roger Racine
1999-12-08 0:00 ` tmoran
1999-12-08 0:00 ` Larry Kilgallen
1999-12-09 0:00 ` Robert Dewar
1999-12-09 0:00 ` Roger Racine
1999-12-09 0:00 ` Larry Kilgallen
1999-12-10 0:00 ` Robert Dewar
1999-12-09 0:00 ` Mike Silva
1999-12-10 0:00 ` Robert Dewar
1999-12-16 0:00 ` Stefan Skoglund
1999-12-08 0:00 ` Robert A Duff
1999-12-07 0:00 ` reason67
1999-12-08 0:00 ` Robert Dewar
1999-12-08 0:00 ` reason67 [this message]
1999-12-08 0:00 ` Robert A Duff
1999-12-08 0:00 ` Larry Kilgallen
1999-12-08 0:00 ` Robert Dewar
1999-12-07 0:00 ` reason67
1999-12-07 0:00 ` reason67
1999-12-07 0:00 ` reason67
1999-12-07 0:00 ` Robert Dewar
1999-12-07 0:00 ` Vladimir Olensky
1999-12-07 0:00 ` Vladimir Olensky
1999-12-09 0:00 ` Geoff Bull
1999-12-09 0:00 ` Vladimir Olensky
1999-12-09 0:00 ` Vladimir Olensky
1999-12-10 0:00 ` Vladimir Olensky
1999-12-07 0:00 ` reason67
1999-12-08 0:00 ` Robert Dewar
1999-12-08 0:00 ` reason67
1999-12-07 0:00 ` reason67
1999-12-07 0:00 ` Robert Dewar
1999-12-07 0:00 ` reason67
1999-12-07 0:00 ` reason67
1999-12-07 0:00 ` reason67
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