Re: What Architectures to use
Re: What Architectures to use
- Subject: Re: What Architectures to use
- From: "Clark S. Cox III" <email@hidden>
- Date: Tue, 21 Sep 2010 16:23:57 -0700
On Sep 21, 2010, at 3:21 AM, Alexander von Below wrote:
>
> Am 21.09.2010 um 12:15 schrieb Stefan Werner:
>
>> Note that in recent versions of Xcode, "32/64-bit Universal" does not include the PPC64 architecture.
>
> Which -- to most people -- should not matter:
>
> As I had stated, Apple recommended applications to be 32 Bit only on OS X 10.5 "Leopard", and recommends 32/64 Bit apps for OS X 10.6 "Snow Leopard" and later -- which is not available for PPC Macs.
>
> Therefore, Apps that use 64 Bit PPC usually should be very specialized in nature.f
Indeed. Unless you absolutely need more than 4 GB of addressable memory space, I would recommend against building for ppc64. Building ppc64 does little other than give you larger pointers, which can actually lead to more memory usage and slowdowns as a result. x86_64, on the other hand, is a different story; along with the larger pointers, you also get more registers and much saner calling-conventions, which can lead to speed-ups in code, even when said code doesn't need 64-bit pointers.
--
Clark S. Cox III
email@hidden
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