linux-kernel - Re: [PATCH] arch: metag: lib: add "umoddi3.S" file for _

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Message-ID: <52B4208B.1080801@imgtec.com>
Date:	Fri, 20 Dec 2013 10:48:43 +0000
From:	James Hogan <james.hogan@...tec.com>
To:	Chen Gang <gang.chen.5i5j@...il.com>
CC:	<rostedt@...dmis.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	<linux-metag@...r.kernel.org>
Subject: Re: [PATCH] arch: metag: lib: add "umoddi3.S" file for __umoddi3()

On 20/12/13 10:20, Chen Gang wrote:
> Hmm... but do you know why we need some 64-bit functions which are
> implemented under "arch/metag/lib/*.S"? can we use <linux/math64.h>
> instead of them? (e.g 64-bit '/').

If you look at linux/math64.h you'll see it only implements division
operations. The other 64 bit operations like shift, compare, and
multiply are relatively cheap so are implemented as intrinsics instead.

Cheers
James

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