From: Dan Andreatta <andreatta@mail.chem.sc.edu.REMOVEME>
Subject: Re: comparing gnat/Ada95 and g77
Date: 14 Mar 2002 09:19:28 -0700
Date: 2002-03-14T16:19:02+00:00 [thread overview]
Message-ID: <Xns91D173AA87EFBandreattamailchemsce@12.252.202.62> (raw)
In-Reply-To: 3C909F9D.6D624B86@flash.net
> something to do with the fact that there are companies with 30+ years
> experience tweaking their compiler (the FORTRAN 77 ones are largely
> mature, not to say that all intrinsics are optimal, I keep seeing
> horrible performance with simple things like circular shift).
Absolutely true. I tried the Compaq Visual Fortran on that piece of code
(the original one), and the speedup is huge, 68 sec. for g77 (cygwin)
versus 4.9 sec for CVF6. Probably CVF does all the possible semplifications
that have been suggested in previous posts.
Dan
next prev parent reply other threads:[~2002-03-14 16:19 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-03-14 9:47 comparing gnat/Ada95 and g77 Reinert Korsnes
2002-03-14 10:37 ` John McCabe
2002-03-14 11:00 ` Preben Randhol
2002-03-15 10:44 ` Reinert Korsnes
2002-03-15 12:14 ` John McCabe
2002-03-15 17:53 ` Georg Bauhaus
2002-03-16 14:00 ` Gautier
2002-03-14 10:58 ` Martin Dowie
2002-03-14 11:04 ` chris.danx
2002-03-14 11:07 ` Bobby D. Bryant
2002-03-14 11:41 ` David C. Hoos, Sr.
2002-03-14 11:06 ` Preben Randhol
2002-03-14 16:43 ` Jeffrey Carter
2002-03-14 11:14 ` Gerald Kasner
2002-03-14 12:59 ` Gary Scott
2002-03-14 13:17 ` Jean-Marc Bourguet
2002-03-15 0:52 ` Gary Scott
2002-03-14 16:19 ` Dan Andreatta [this message]
2002-03-15 9:35 ` Gerald Kasner
2002-03-14 17:31 ` Toshitaka Kumano
2002-03-14 16:40 ` Jeffrey Carter
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