From: Marc Lehmann <pcg@goof.com>
To: egcs@cygnus.com
Subject: Re: -malign-*=0 vs 2
Date: Tue, 09 Dec 1997 07:27:00 -0000 [thread overview]
Message-ID: <19971209123139.11886@cerebro.laendle> (raw)
In-Reply-To: <12710.881650523@hurl.cygnus.com>
On Mon, Dec 08, 1997 at 11:55:23PM -0700, Jeffrey A Law wrote:
> In message < 199712081630.LAA19482@onsager.chem.mcgill.ca. >you write:
> > to zero (for my pentium), but would like someone to comment on why this is
> > correct, and why Linus is wrong.
> I think you would have to ask Linux why he did things like that.
Linus found out that the 16 byte alignment was simply excessive and not necessary.
He did not try to use zero alignment, which should be as fast as 16 byte alignment,
so he stuck with the (IMHO) 4 byte alignment.
Anyhow, kernel speed wasn't that much of an issue, since time-critical paths
are full of hand-optimized assembler anyway, and the memory loss
due to the big alignment was considerable.
-----==- |
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---==---(_)__ __ ____ __ Marc Lehmann +--
--==---/ / _ \/ // /\ \/ / pcg@goof.com |e|
-=====/_/_//_/\_,_/ /_/\_\ --+
The choice of a GNU generation |
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prev parent reply other threads:[~1997-12-09 7:27 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
1997-12-08 9:35 David Ronis
1997-12-08 22:52 ` Jeffrey A Law
1997-12-09 7:27 ` Marc Lehmann [this message]
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