netdev - Re: [PATCH] tg3 : avoid an expensive divide

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Message-ID: <1170799756.3535.27.camel@rh4>
Date:	Tue, 06 Feb 2007 14:09:16 -0800
From:	"Michael Chan" <mchan@...adcom.com>
To:	"David Miller" <davem@...emloft.net>
cc:	dada1@...mosbay.com, netdev@...r.kernel.org
Subject: Re: [PATCH] tg3 : avoid an expensive divide

On Tue, 2007-02-06 at 13:19 -0800, David Miller wrote:

> 
> Because I've seen gcc optimize this properly before (at least on
> sparc64), it means that either:
> 
> 1) There is a GCC bug where the properties of the constants
>    do not propagate.
> 
> 2) GCC really thinks the divide is cheaper (code density vs.
>    cycle count tradeoffs etc.)
> 
> Anyways, we should probably apply your patch in any event.
> 
> Michael, any objections?
> 
No objections.  I will create another patch to convert similar divisions
in other spots.

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