Question about the various supported build architectures...
Question about the various supported build architectures...
- Subject: Question about the various supported build architectures...
- From: Terry Simons <email@hidden>
- Date: Wed, 5 Mar 2008 14:56:40 -0700
Hi,
Is there a document somewhere which explains the various advantages/
disadvantages of supporting the various architectures in an Xcode build?
For instance:
What's the difference between straight "ppc" vs "ppc970" or
"ppc7400"? I know that all 3 are supported when building against
10.4, and I'm assuming that the only difference here are CPU
optimizations that are specific to a given CPU type? Is there a list
of the differences somewhere? Is there any advantage to using ppc970
and/or ppc7400 in addition to ppc for an application which isn't
necessarily math-heavy, or is it recommended to go with the safer more
generic ppc option?
Extending this to 10.5 and later SDKs... Besides the obvious 64-bit vs
32-bit differences with ppc vs ppc64 and i386 vs x86_64, is there a
document describing the various iterations? If I build an i386
application that runs on an x86_64 native system, what are the
performance implications? Is there a big difference between the
native actual architecture in this case? What I mean here is, if my
application is not math intensive, am I going to gain a perceivable
bump by building native 64-bit vs building 32-bit?
Are people building Universal Binaries with all of the supplied
architectures, or is it generally advisable to choose the smallest
number of architectures to minimize potential problems?
I'd like to read up on this more if there are docs available.
Thanks!
- Terry
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