linux-kernel - Re: [PATCH 3/4] lib: vsprintf: Optimize put_dec

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Message-ID: <CAH+eYFBscQnH78CZFLq2GwTJZR1+zkUc6gL1QgnWNoFCQwRy2A@mail.gmail.com>
Date:	Sun, 23 Sep 2012 16:18:27 +0200
From:	Rabin Vincent <rabin@....in>
To:	George Spelvin <linux@...izon.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	vda.linux@...glemail.com, mina86@...a86.com, hughd@...gle.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] lib: vsprintf: Optimize put_dec_trunc8

2012/8/3 George Spelvin <linux@...izon.com>:
> If you're going to have a conditional branch after
> each 32x32->64-bit multiply, might as well shrink the code
> and make it a loop.
>
> This also avoids using the long multiply for small integers.
>
> (This leaves the comments in a confusing state, but that's a separate
> patch to make review easier.)
>
> Signed-off-by: George Spelvin <linux@...izon.com>

This patch breaks IP address printing with "%pI4" (and by extension,
nfsroot).  Example:

 - Before: 10.0.0.1
 - After: 10...1
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