netdev - Re: [PATCH] NET : change layout of ehash table

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Message-Id: <20070209.011542.21927454.davem@davemloft.net>
Date:	Fri, 09 Feb 2007 01:15:42 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	dada1@...mosbay.com
Cc:	ak@...e.de, linux@...izon.com, akepner@....com,
	netdev@...r.kernel.org
Subject: Re: [PATCH] NET : change layout of ehash table

From: Eric Dumazet <dada1@...mosbay.com>
Date: Fri, 9 Feb 2007 10:06:24 +0100

> Yes, but a decent C compiler for such targets should not use a
> multiply instruction to perform a (idx * 12) operation... :)

Good point.

Actually, I could never get GCC to avoid a divide on sparc64 for
certain kinds of pointer arithmetic when the elements were not
a power of two.  It probably has something to do with signedness.

I think I narrowed is down to the fact that you can't legally replace
a signed divide with shift/add/subtract.  But I could be remembering
things wrong.
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