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From: "Jörn Engel" <joern@wohnheim.fh-wedel.de>
To: insecure <insecure@mail.od.ua>
Cc: Michael Frank <mhf@linuxmail.org>,
	Yann Droneaud <yann.droneaud@mbda.fr>,
	fruhwirth clemens <clemens-dated-1063536166.2852@endorphin.org>,
	linux-kernel@vger.kernel.org
Subject: Re: nasm over gas?
Date: Fri, 5 Sep 2003 19:45:08 +0200	[thread overview]
Message-ID: <20030905174508.GA24951@wohnheim.fh-wedel.de> (raw)
In-Reply-To: <200309052028.37367.insecure@mail.od.ua>

On Fri, 5 September 2003 20:28:37 +0300, insecure wrote:
> 
> What gives you an impression that anyone is going to rewrite linux in asm?
> I _only_ saying that compiler-generated asm is not 'good'. It's mediocre.

Depends.  A couple weeks back, I've entered the Linuxtag coding
contest with a friend.  The objective was to optimize some matrix
multiplication.  We've produced *much* faster code than anyone who
tried to do it in assembler and we entered the contest during a slow
hour, when it was half over.

Given infinite developer time, you can create better assembler code
than the compiler can.  But with limited time, it is a challenge.
Plus the code isn't automagically updated to new cpus simply by
recompiling.

So in the real world, compiler generated assembler is not perfect, but
it is still faster than what most human would come up with even if
they had the time.

Jörn

-- 
Public Domain  - Free as in Beer
General Public - Free as in Speech
BSD License    - Free as in Enterprise
Shared Source  - Free as in "Work will make you..."

  reply	other threads:[~2003-09-05 17:45 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-09-04 10:42 nasm over gas? Fruhwirth Clemens
2003-09-04 12:32 ` Antonio Vargas
2003-09-04 13:44 ` Yann Droneaud
2003-09-04 14:05   ` Richard B. Johnson
2003-09-04 14:21     ` Sean Neakums
2003-09-04 14:33       ` Richard B. Johnson
2003-09-04 15:09         ` Yann Droneaud
2003-09-04 14:55     ` Yann Droneaud
2003-09-05 21:16       ` George Anzinger
2003-09-04 14:57   ` Michael Frank
2003-09-04 15:43     ` Fruhwirth Clemens
2003-09-04 22:28     ` insecure
2003-09-05 12:59       ` Michael Frank
2003-09-05 17:28         ` insecure
2003-09-05 17:45           ` Jörn Engel [this message]
2003-09-06 17:18             ` insecure
2003-09-07 18:49           ` Eric W. Biederman
2003-09-07 19:30             ` Jamie Lokier
2003-09-09 21:37               ` insecure
2003-09-09 21:34             ` insecure
2003-09-11 11:07               ` Ricardo Bugalho
2003-09-12 15:26                 ` insecure
2003-09-12 17:27                   ` Ricardo Bugalho
2003-09-12 22:17                     ` Jörn Engel
2003-09-13 19:25                       ` Jamie Lokier
2003-09-13 19:51                         ` Jörn Engel
2003-09-11 14:03               ` Eric W. Biederman
2003-09-11 17:05                 ` Jamie Lokier
2003-09-09 20:56           ` Pavel Machek
2003-09-05 13:27       ` Jesse Pollard
2003-09-05 23:51     ` Aaron Lehmann
2003-09-06  1:41       ` Valdis.Kletnieks
2003-09-04 14:56 ` Yann Droneaud
2003-09-05 11:42 ` Jörn Engel
2003-09-05 12:04   ` Fruhwirth Clemens
2003-09-05 12:37     ` Jörn Engel
2003-09-05 12:21 John Bradford
2003-09-05 12:25 John Bradford
2003-09-05 12:25 ` Fruhwirth Clemens
2003-09-06 22:08   ` Herbert Poetzl
2003-09-07 20:40     ` Fruhwirth Clemens
2003-09-05 13:20 ` Richard B. Johnson
2003-09-05 13:57 John Bradford
2003-09-05 15:39 ` Mehmet Ceyran
2003-09-06 20:24   ` David B. Stevens
     [not found] <rZQN.83u.21@gated-at.bofh.it>
     [not found] ` <saVL.7lR.1@gated-at.bofh.it>
     [not found]   ` <soFo.16a.1@gated-at.bofh.it>
     [not found]     ` <ssJa.6M6.25@gated-at.bofh.it>
     [not found]       ` <tcVB.rs.3@gated-at.bofh.it>
2003-09-08 12:03         ` Ihar 'Philips' Filipau
2003-09-08 13:53           ` Richard B. Johnson
2003-09-08 16:10             ` Jamie Lokier
2003-09-08 16:17           ` Jamie Lokier
2003-09-08 16:45             ` Ihar 'Philips' Filipau
2003-09-08 16:58               ` Jamie Lokier
2003-09-08 17:59           ` William Lee Irwin III
     [not found] <snJB.8dk.25@gated-at.bofh.it>
     [not found] ` <snTm.8qD.41@gated-at.bofh.it>
     [not found]   ` <sTpW.18Z.19@gated-at.bofh.it>
     [not found]     ` <teE5.2XZ.9@gated-at.bofh.it>
2003-09-08 12:07       ` Ihar 'Philips' Filipau
     [not found] <tt0q.6Rc.17@gated-at.bofh.it>
     [not found] ` <tt0r.6Rc.19@gated-at.bofh.it>
     [not found]   ` <tt0r.6Rc.21@gated-at.bofh.it>
     [not found]     ` <tt0r.6Rc.23@gated-at.bofh.it>
     [not found]       ` <tt0r.6Rc.25@gated-at.bofh.it>
     [not found]         ` <tt0q.6Rc.15@gated-at.bofh.it>
     [not found]           ` <tyCN.6RD.13@gated-at.bofh.it>
2003-09-08 20:08             ` Ihar 'Philips' Filipau

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