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To: David Howells <dhowells@redhat.com>
Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org#
Subject: Re: [RHEL5 PATCH 1/4] Provide fallback full 64-bit divide/modulus ops for gcc
References: <20060814211504.27190.10491.stgit@warthog.cambridge.redhat.com>
	<20060814211507.27190.61876.stgit@warthog.cambridge.redhat.com>
From: Andi Kleen <ak@suse.de>
Date: 15 Aug 2006 10:10:32 +0200
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David Howells <dhowells@redhat.com> writes:

> Provide simple, reasonably quick full 64-bit divide and modulus ops for gcc to
> call behind the scenes as:
> 
> 	__udivmoddi4
> 	__udivdi3
> 	__umoddi3

At least Linus' traditional argument against this is that it's better
to open code these (do_div) so that it's clear to the coder that they
are really costly.

-Andi