Re: [PATCH] Reduce code size of _REENT_INIT_PTR()

[Eric Blake <eblake at redhat dot com>]

On 04/26/2013 08:45 AM, Joel Sherrill wrote:
> On 4/26/2013 5:29 AM, Eric Blake wrote:
>> On 04/26/2013 02:43 AM, Sebastian Huber wrote:
>>> Use one memset() to initialize everything to zero.  Set non-zero fields
>>> in a second step.  There is only a small runtime overhead, but the code
>>> size is greatly reduced.  This change assumes the NULL pointer and '\0'
>>> are encoded as zero bits.
>> '\0' is required to be all zero bits by C99; no assumption required.
>> NULL is allowed to be encoded as non-zero bits, but such systems are
>> extremely rare, and I don't know of any newlib target that violates the
>> assumption (that is, we have other code in newlib that assumes a memset
>> to 0 correctly initializes null pointer values).
>>
> Is that a blessing to commit this Eric?

The idea makes sense, and the code looks okay to me, but I'm not a
maintainer, so you may want for additional approval.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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