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Re: [Qemu-devel] [PATCH v2 2/4] Add i.MX I2C controller driver.

From: Peter Crosthwaite
Subject: Re: [Qemu-devel] [PATCH v2 2/4] Add i.MX I2C controller driver.
Date: Sun, 5 May 2013 20:53:45 +1000

Hi Peter,

On Sun, May 5, 2013 at 8:47 PM, Peter Maydell <address@hidden> wrote:
> On 5 May 2013 04:58, Jean-Christophe DUBOIS <address@hidden> wrote:
>> On 05/05/2013 05:14 AM, Peter Crosthwaite wrote:
>>> You could use an extract macro. extract32 is generally considered
>>> better than shift and & logicvfor multi-bit fields. Ill have to look
>>> up if extract16 exists (im away from tree for this review)
>> no extract16() macro spotted.
>> Should one be added?
> There's no need for one -- just use extract32. The only
> reason for having a separate extract64 is to avoid doing
> 64 bit arithmetic when we don't have to, I think.

perhaps a quick:

#define extract16(a, b, c) (uint16_t)extract32((uint16_t)(a), (b), (c))

would keep the 16bit device code explicit and clean? Save on
dummy casts in certain situations as well (but not this one).


> -- PMM

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