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Re: csum_ipv6_magic()

To: alan@lxorguk.ukuu.org.uk
Subject: Re: csum_ipv6_magic()
From: Machida Hiroyuki <machida@sm.sony.co.jp>
Date: Mon, 22 Oct 2001 19:56:19 +0900
Cc: ralf@uni-koblenz.de, linux-mips@oss.sgi.com
In-reply-to: <E15vZvr-000138-00@the-village.bc.nu>
References: <20011022151606V.machida@sm.sony.co.jp> <E15vZvr-000138-00@the-village.bc.nu>
Sender: owner-linux-mips@oss.sgi.com
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
Subject: Re: csum_ipv6_magic()
Date: Mon, 22 Oct 2001 08:55:35 +0100 (BST)

> > I guess that csum_ipv6_magic() in include/asm-mips/checksum.h 
> > needs "addu %0, $1" at the next of "sltu $1, %0, $1".
> > Without this, you cannot add a carry of the last addtion.
> 
> Is that actually needed. The final end around carry cannot itself cause
> a second carry.

I don't know csum_ipv6_magic() in include/asm-mips/checksum.h works
fine or not. But if csum_ipv6_magic() doesn't need "addu %0, $1" at
next of the final "sltu $1, %0, $1", you can remove the final 
"sltu $1, %0, $1".

---
Hiroyuki Machida
Sony Corp.

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