From: Jeff Garzik <jgarzik@pobox.com>
To: Philippe De Muyter <phdm@macqel.be>
Cc: Dave Jones <davej@codemonkey.org.uk>, linux-kernel@vger.kernel.org
Subject: Re: sundance DFE-580TX DL10050B patch
Date: Mon, 17 Mar 2003 12:49:20 -0500 [thread overview]
Message-ID: <20030317174920.GC9667@gtf.org> (raw)
In-Reply-To: <200303171740.h2HHebY01003@mail.macqel.be>
On Mon, Mar 17, 2003 at 06:40:36PM +0100, Philippe De Muyter wrote:
> Dave Jones wrote :
> > On Mon, Mar 17, 2003 at 02:56:09PM +0100, Philippe De Muyter wrote:
> >
> > > + writew((dev->dev_addr[i + 1] << 8) + dev->dev_addr[i],
> >
> > Don't you want to OR those together instead of add them ?
> >
> > Dave
> >
> You're right.
No.
Adding and or'ing are exactly equivalent for the above case, where you
shift an 8-bit value left 8 bits, then add it to another 8-bit value.
The final answer may be obtained from examining the compiler's assembly
output, and see which combination ('or' or 'add') produces the best
code.
Jeff
next prev parent reply other threads:[~2003-03-17 17:38 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-17 13:56 Philippe De Muyter
2003-03-17 17:24 ` Dave Jones
2003-03-17 17:40 ` Philippe De Muyter
2003-03-17 17:49 ` Jeff Garzik [this message]
2003-03-18 14:27 ` Philippe De Muyter
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