From: John Carr <jfc@MIT.EDU>
To: caml-list@inria.fr
Subject: Re: [Caml-list] NBody (one more question)
Date: Sat, 26 Feb 2005 11:08:55 -0500 [thread overview]
Message-ID: <200502261608.j1QG8tE5008133@psi-phi.mit.edu> (raw)
In-Reply-To: Your message of "Fri, 25 Feb 2005 18:17:54 +0100." <20050225.181754.69456034.debian00@tiscali.be>
> > Optimizations in gcc -O1 compared to gcc -O0 include register
> > allocation, dead code elimination, branch straightening, common
> > subexpression elimination, instruction combining, and instruction
> > scheduling.
>
> Ok, but do you know which one(s) account for the speedup observed in
> this particular case?
There is no way to be sure without careful analysis of generated
code and possibly the state of gcc's internal representation at
intermediate steps. Most of the optimizations at -O1 can not be
turned on or off independently of the general optimization level.
next prev parent reply other threads:[~2005-02-26 16:09 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-02-07 18:57 [Benchmark] NBody Christophe TROESTLER
2005-02-07 19:16 ` [Caml-list] " Will M. Farr
2005-02-07 19:36 ` Christophe TROESTLER
2005-02-07 19:55 ` Will M. Farr
2005-02-08 10:34 ` Olivier Andrieu
2005-02-08 10:52 ` Micha
2005-02-07 20:16 ` Markus Mottl
2005-02-07 19:37 ` Martin Jambon
2005-02-07 19:46 ` Christophe TROESTLER
2005-02-07 20:22 ` Martin Jambon
2005-02-07 20:04 ` sejourne_kevin
2005-02-07 20:32 ` Robert Roessler
2005-02-07 22:57 ` Oliver Bandel
2005-02-08 1:29 ` skaller
2005-02-08 1:48 ` Will M. Farr
2005-02-08 9:01 ` Ville-Pertti Keinonen
2005-02-08 9:37 ` skaller
2005-02-08 10:10 ` Ville-Pertti Keinonen
2005-02-08 16:36 ` skaller
2005-02-08 12:04 ` Marcin 'Qrczak' Kowalczyk
2005-02-08 17:06 ` skaller
2005-02-08 10:25 ` Xavier Leroy
2005-02-08 18:34 ` skaller
2005-02-08 10:43 ` Xavier Leroy
2005-02-08 11:26 ` Ville-Pertti Keinonen
2005-02-08 15:59 ` Florian Hars
2005-02-13 16:40 ` Christoph Bauer
2005-02-13 18:13 ` Christophe TROESTLER
2005-02-24 22:18 ` NBody (one more question) Christophe TROESTLER
2005-02-25 17:06 ` [Caml-list] " John Carr
2005-02-25 17:17 ` Christophe TROESTLER
2005-02-26 16:08 ` John Carr [this message]
2005-02-25 17:24 ` Ken Rose
2005-02-25 17:42 ` Oliver Bandel
2005-02-25 17:57 ` Xavier Leroy
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