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To: Andrew Morton <akpm@zip.com.au>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [patch 4/21] fix ARCH_HAS_PREFETCH
References: <3D56147E.15E7A98@zip.com.au.suse.lists.linux.kernel>
From: Andi Kleen <ak@suse.de>
Date: 11 Aug 2002 11:53:21 +0200
In-Reply-To: Andrew Morton's message of "11 Aug 2002 10:02:40 +0200"
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Andrew Morton <akpm@zip.com.au> writes:

> Which needs a working ARCH_HAS_PREFETCH to avoid probable extra code
> generation on CPUs which don't have prefetch.

When you use gcc 3.1+ you can use __builtin_prefetch() and gcc takes care of
it. See asm-x86_64/prefetch.h of a working example.

Of course generic C code should not use the ugly builtins directly, but
it could be used to define the wrappers.

-Andi
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