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To: paulus@samba.org
Cc: Momchil Velikov <velco@fadata.bg>, Tom Rini <trini@kernel.crashing.org>,
        linux-kernel@vger.kernel.org, gcc@gcc.gnu.org,
        linuxppc-dev@lists.linuxppc.org
Subject: Re: [PATCH] C undefined behavior fix
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From: Florian Weimer <fw@deneb.enyo.de>
Date: Fri, 04 Jan 2002 10:05:07 +0100
In-Reply-To: <15411.36909.387949.863222@argo.ozlabs.ibm.com> (Paul
 Mackerras's message of "Thu, 3 Jan 2002 09:56:45 +1100 (EST)")
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Paul Mackerras <paulus@samba.org> writes:

> One of the reasons why C is a good language for the kernel is that its
> memory model is a good match to the memory organization used by the
> processors that linux runs on.  Thus, for these processors, adding an
> offset to a pointer is in fact simply an arithmetic addition.

But this is not the memory model of C!  Adding an offset to a pointer
is an operation involving objects defined by the C language, and not
machine registers.  Sometimes, this makes a noticeable difference.
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