From: Matti Aarnio <matti.aarnio@zmailer.org>
To: Daniel Phillips <phillips@arcor.de>
Cc: Linux Memory Management <linux-mm@kvack.org>
Subject: Re: [PATCH] Optimize away pte_chains for single mappings
Date: Mon, 15 Jul 2002 19:55:27 +0300 [thread overview]
Message-ID: <20020715195527.X28720@mea-ext.zmailer.org> (raw)
In-Reply-To: <E17U8kG-0003bx-00@starship>; from phillips@arcor.de on Mon, Jul 15, 2002 at 06:30:43PM +0200
On Mon, Jul 15, 2002 at 06:30:43PM +0200, Daniel Phillips wrote:
> On Monday 15 July 2002 17:40, Matti Aarnio wrote:
> > In register-lacking i386 this masking is definite punishment..
>
> Nonsense, the value needs to be loaded into a register anyway
> before being used.
Think in assembly, what is needed in i386 to mask the pointer ?
How the pointer is then used ? How many register you need ?
What registers can be used for masking arithmetics, and which
are usable in indexed memory reference address calculation ?
Linus seems to care about this kind of speed things, and
at least DaveM does look into gcc generated assembly to
verify, that used C idioms are compiled correctly and fast.
> Daniel
/Matti Aarnio
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next prev parent reply other threads:[~2002-07-15 16:55 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-09 18:35 Dave McCracken
2002-07-13 13:13 ` Daniel Phillips
2002-07-15 14:02 ` Dave McCracken
2002-07-15 14:56 ` Daniel Phillips
2002-07-15 15:40 ` Matti Aarnio
2002-07-15 16:10 ` Daniel Phillips
2002-07-15 16:34 ` Rik van Riel
2002-07-15 16:42 ` Daniel Phillips
2002-07-15 20:57 ` Andrew Morton
2002-07-16 4:50 ` Daniel Phillips
2002-07-15 16:30 ` Daniel Phillips
2002-07-15 16:55 ` Matti Aarnio [this message]
2002-07-15 17:50 ` Daniel Phillips
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