linux-kernel - Re: [PATCH 1/3]: Replace kernel/timeconst.pl with kernel/timeconst.sh

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Date:	Sun, 04 Jan 2009 12:39:36 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Rob Landley <rob@...dley.net>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Sam Ravnborg <sam@...nborg.org>,
	Embedded Linux mailing list <linux-embedded@...r.kernel.org>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/3]: Replace kernel/timeconst.pl with kernel/timeconst.sh

Rob Landley wrote:
> 
> C) The only calculation which can overflow 64 bits (the ADJ32 one) turns out 
> not to need arbitrary precision math, just 72 bits, and if it ever uses more 
> than 32 then bottom 32 are all zero before the divide so you can do it in 
> three lines.
> 

... for the current code (32 bits).  When we get an overflow-less 64-bit
implementation, this code will have to be redone, which is not true for
a properly done implementation.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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