From mboxrd@z Thu Jan  1 00:00:00 1970
From: Keir Fraser <keir.xen@gmail.com>
Subject: Re: [PATCH RFC 04/25] Replace "/" operand with div64
Date: Wed, 07 Dec 2011 11:35:30 +0000
Message-ID: <CB050002.26A61%keir.xen@gmail.com>
References: <4EDF3EC70200007800065E3B@nat28.tlf.novell.com>
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To: Jan Beulich <JBeulich@suse.com>, Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: xen-devel@lists.xensource.com, Ian Campbell <ian.campbell@citrix.com>, Tim Deegan <Tim.Deegan@citrix.com>
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On 07/12/2011 09:24, "Jan Beulich" <JBeulich@suse.com> wrote:

>>>> On 06.12.11 at 19:19, <stefano.stabellini@eu.citrix.com> wrote:
>> ARM does not have a division operator: division has to be implemented
>> in software.
>> On x86 and ia64 div64 falls back to a do_div based implementation.
> 
> But this needs to be done carefully and correctly - there's no
> one-fits-all div64() implementation.

I'm sure gcc-arm must emit lib calls for divisions. Maybe arch/arm needs to
implement some of those if arm doesn't support even 32-bit divide. Common
lib code covers only 64-bit divide.

 -- Keir