On Jul 18, 2012, at 12:45 AM, Martin Hewitson wrote:

> On 18, Jul, 2012, at 03:07 AM, Charles Srstka <cocoa...@charlessoft.com> 
> wrote:
> 
>> On Jul 17, 2012, at 11:31 AM, Martin Hewitson wrote:
>> 
>>> On 17, Jul, 2012, at 05:42 PM, Sean McBride <s...@rogue-research.com> wrote:
>>> 
>>>> On Tue, 17 Jul 2012 12:30:39 +0200, Martin Hewitson said:
>>>> 
>>>>> This started to appear during the process of going from GC to non-GC.
>>>> 
>>>> What do you mean "non-GC"?  I strongly suggest going from GC to ARC, not 
>>>> from GC back to the stone-age retain-release.  Although quite different 
>>>> 'under the hood', writing for GC and ARC is not so different, and you can 
>>>> even switch over slowly.
>>> 
>>> That was my original plan, but ARC is 64-bit only, right? I'm not sure I'm 
>>> ready to drop 32-bit support yet, at least not without canvasing opinion 
>>> from the users.
>>> 
>>> Martin
>> 
>> I’ve got an app that’s backward-compatible all the way to 10.4/PPC, to which 
>> I added Sparkle support about half a year ago. In that half year, according 
>> to the Sparkle stats, 93.99% of my users have been on 64-bit Intel CPUs. Of 
>> the 6% who are not on 64-bit Intel, only  2.72% are using 32-bit Intel, 
>> followed by 1.91% on 32-bit PPC and 1.38% on 64-bit PPC (i.e. the G5).
> 
> 
> That's very interesting. Not least of all that Sparkle can provide these 
> stats. I didn't know that. I guess today I'm integrating Sparkle and 
> preparing to gather some statistics. I'd very much like to drop 32-bit 
> support in favour of ARC!

The thing about it is that you appear to be using block-based APIs already, 
which means you already require at least 10.6, which means that you’re already 
Intel-only and have no PPC users, so if your user base is like mine, you’ll 
lose only 2.72% of your userbase by dropping 32-bit.

And honestly, your numbers probably *are* pretty close to mine. 32-bit Intel 
Macs are pretty rare. The most common are the original white/black MacBooks, 
which were only in production for about six months in 2006, since Apple 
switched to 64-bit processors almost immediately after they switched to Intel.

Charles

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