From: James Hogan <james.hogan@imgtec.com>
To: Chen Gang <gang.chen.5i5j@gmail.com>
Cc: <rostedt@goodmis.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
<linux-metag@vger.kernel.org>
Subject: Re: [PATCH] arch: metag: lib: add "umoddi3.S" file for __umoddi3()
Date: Fri, 20 Dec 2013 10:48:43 +0000 [thread overview]
Message-ID: <52B4208B.1080801@imgtec.com> (raw)
In-Reply-To: <52B419DE.8050706@gmail.com>
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
next prev parent reply other threads:[~2013-12-20 10:48 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-19 12:05 [PATCH] arch: metag: lib: add "umoddi3.S" file for __umoddi3() Chen Gang
2013-12-19 12:17 ` James Hogan
2013-12-19 13:37 ` Chen Gang
2013-12-19 13:47 ` James Hogan
2013-12-20 1:44 ` Chen Gang
2013-12-20 9:30 ` James Hogan
2013-12-20 10:20 ` Chen Gang
2013-12-20 10:48 ` James Hogan [this message]
2013-12-20 11:51 ` Chen Gang
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