netdev - Re: [PATCH] ixgbe: Introduce new 10GbE driver for Intel 82598 based PCI Express adapters...

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Date:	Mon, 02 Jul 2007 07:27:05 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Jeff Garzik <jeff@...zik.org>
CC:	Ayyappan Veeraiyan <ayyappan.veeraiyan@...el.com>,
	netdev@...r.kernel.org, auke-jan.h.kok@...el.com,
	akpm@...ux-foundation.org
Subject: Re: [PATCH] ixgbe: Introduce new 10GbE driver for Intel 82598 based
 PCI	Express adapters...

Jeff Garzik wrote:
>>> always avoid bitfields.  They generate horrible code, and endian 
>>> problems abound (though no endian problems are apparent here).
>>
>> they generate no worse code than open coding the checks for these 
>> feature flags...
> 
> That would be the logical assumption, but reality does not bear that 
> logic out to be true.
>

I just checked a small example and gcc just generates a testb with an 
immediate value, which isn't all that bad code.

Do you remember which gcc you tested with?
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