From: Gautier <gautier.demontmollin@maths.unine.ch>
Subject: Re: fast computing with GNAT (?)
Date: 2000/04/07
Date: 2000-04-07T00:00:00+00:00 [thread overview]
Message-ID: <38ED9A6E.5809968F@maths.unine.ch> (raw)
In-Reply-To: 8ck2ur$sgu$1@news.uit.no
Reinert Korsnes wrote:
> The f77 version takes about 7.5 s and the Ada version takes
> about 38 s on my Linux/laptop.
>
> The actual build commands are:
>
> f77 -c -O4 -ffast-math -malign-double test1.f
>
> and
>
> gnatmake -O4 test1.adb
Ok. Try gnatmake -O4 -ffast-math -gnatp test1.adb
The -gnatp is essential (=pragma suppress(all_checks))
to compare with Fortran!
In addition there are -funroll-loops, -fomit-frame-pointer,
etc. etc. to boost both G77 and GNAT. Maybe a -mpentium
is needed (otherwise GCC will think this is a 386!).
HTH
______________________________________________________
Gautier -- http://members.xoom.com/gdemont/gsoft.htm
next prev parent reply other threads:[~2000-04-07 0:00 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-04-07 0:00 fast computing with GNAT (?) Reinert Korsnes
2000-04-07 0:00 ` Gautier [this message]
2000-04-07 0:00 ` Andreas Schulz
2000-04-07 0:00 ` Gisle S�lensminde
2000-04-07 0:00 ` Robert Dewar
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