linux-kernel - Re: [RFC][PATCH] A generic boolean

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Date:	Fri, 04 Aug 2006 22:51:15 +0200
From:	Bodo Eggert <7eggert@...tempel.de>
To:	Jes Sorensen <jes@....com>, Andreas Schwab <schwab@...e.de>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Jeff Garzik <jeff@...zik.org>, ricknu-0@...dent.ltu.se,
	linux-kernel@...r.kernel.org, Andrew Morton <akpm@...l.org>
Subject: Re: [RFC][PATCH] A generic boolean

Jes Sorensen <jes@....com> wrote:
> Andreas Schwab wrote:

>> Try determining the alignment of u64 on i386.  You will be surprised.
> 
> If thats the case, then thats really scary :-( I'd claim it's a bug and
> I am willing to be that iptables isn't the only place that is affected
> or will be in the future.

It's not a bug, since 64 bit integers require only 4-byte-alignment if
addressed by the CPU/FPU. You may benefit from cacheline effects if you
align to 64 bits, but not on i[34]86 (and those define the ABI).

If you want 64-bit-alignment, you can use -malign-double.
-- 
Ich danke GMX dafür, die Verwendung meiner Adressen mittels per SPF
verbreiteten Lügen zu sabotieren.

http://david.woodhou.se/why-not-spf.html
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