plans for 64bit support

[Joshua Root]

Joshua Root wrote:
> Emil Lundberg wrote:
>>>> Is there documentation backing up the  
>>>> claim
>>>> that 64-bit ppc code is slower on 64-bit ppc machines than 32-bit  
>>>> ppc code?
>>> I've seen benchmark numbers that show this. I'll see if I can dig  
>>> them up.
> 
> OK, I found some of the comparisons I was thinking of: a Linux-based one
> with several benchmarks[1], and two Darwin-based ones using Geekbench,
> on Tiger[2] and Leopard[3].
> 
> [1] <http://lixom.net/~olof/64bit-perf.pdf>
> [2] <http://www.geekpatrol.ca/2006/09/32-bit-vs-64-bit-performance/>
> [3]
> <http://www.primatelabs.ca/blog/2007/10/leopard-performance-october-2007/>
> 
> I'll have access to a G5 in a few days' time, so if no one beats me to
> it, I'll run some other comparisons.

Well, no one beat me to it. ;-)

I've added a use_64_bit variant to the nbench-byte and ubench ports, and 
run them with and without the variant on a Power Mac G5 and a Mac Pro. 
Results are attached.

- Josh
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