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Subject: Re: [RFC-PATCH] lib: add byteorder helpers for the aligned case
From: Harvey Harrison <harvey.harrison@gmail.com>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: Bryan Wu <cooloney@kernel.org>, Jie Zhang <jie.zhang@analog.com>,
       Oliver Neukum <oliver@neukum.org>, david-b@pacbell.net, greg@kroah.com,
       linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
       Andrew Morton <akpm@linux-foundation.org>
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Date: Fri, 16 May 2008 17:37:56 -0700
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On Fri, 2008-05-16 at 20:35 -0400, Alan Stern wrote:
> On Fri, 16 May 2008, Harvey Harrison wrote:
> 
> > +static inline void put_le16(u16 val, void *ptr)
> > +{
> > +	*(__le16 *)ptr = cpu_to_le16(val);
> > +}
> 
> Is this able to do the byte rearrangement at compile time if val is a 
> compile-time constant?  I imagine it would.
> 

Yes, the cpu_to_le/be functions to get optimized if they are passed a
compile time constant.


Harvey