linux-kernel - Re: [PATCH] udivdi3: 64 bit divide

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Message-ID: <Pine.LNX.4.61.0702282327410.23355@yvahk01.tjqt.qr>
Date:	Wed, 28 Feb 2007 23:30:13 +0100 (MET)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	Ian Molton <spyro@....com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Stephen Hemminger <shemminger@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] udivdi3: 64 bit divide


On Feb 27 2007 22:39, Ian Molton wrote:
> Russell King wrote:
>> On Tue, Feb 27, 2007 at 01:36:56PM -0800, Andrew Morton wrote:
>> > On Tue, 27 Feb 2007 13:18:40 -0800 Stephen Hemminger
>> > <shemminger@...ux-foundation.org> wrote:
>> > > Then we should pull the existing udivdi3 implementations?
>> > >
>> > Not much point really.  Some architectures have gone
>> > and done that, but x86 has not.  x86 has enough
>> > coverage for us to pick up most problems, and any
>> > remaining problems are obviously in scruffy
>> > architectures which don't care about performance ;)
>> 
>> I doubt arm26 uses udivdi3, but that's something Ian
>> would have to confirm.
>
> I doubt it is used also, however I am not in a position
> to test this until at least after I have moved house.
> Please leave alone for now.

Simple. The non-arch specific code does not use 64/64
divides through the "/" operator (otherwise there would
already have been udivdi3 linking errors). So what
remains to check is arch/arm26. grep -Pr 'int64|\bu64'
returns only a few results to check (kernel/ecard.c,
nwfpe/), so the answer is most likely no.



Jan
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