From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jan-Benedict Glaw <jbglaw@lug-owl.de>
Subject: Re: newby.-interpreting C
Date: Thu, 30 Dec 2004 12:40:11 +0100
Message-ID: <20041230114011.GA2460@lug-owl.de>
References: <cq77vi$1ej$1@sea.gmane.org> <20041220211709.GD2460@lug-owl.de> <16851.58832.659413.893211@gargle.gargle.HOWL>
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On Thu, 2004-12-30 11:26:08 +0000, Glynn Clements <glynn@gclements.plus.com>
wrote in message <16851.58832.659413.893211@gargle.gargle.HOWL>:
> Jan-Benedict Glaw wrote:
>=20
> > General rule: if you don't *need* this for a good reason, or if you even
> > don't know what it does, you don't need it, since it also introduces a
> > performance penalty: CPUs tend to be fast at naturally aligned memory
> > accesses, but quite slow on non-aligned accesses.
>=20
> On most processor types, unaligned accesses will fail (either generate
> an exception or return bogus data). The x86 family is the exception,
> in that unaligned access merely reduces performance.

As is the VAX :)

MfG, JBG

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