Clang: the thought behind Apple's insistence upon Xcode

Paul D. DeRocco pderocco at
Thu Apr 15 21:03:03 CDT 2010

> From: Douglas
> The iPad uses an ARM processor, not a G4.
> The ARM chips were first utilised in the Acorn Archimedes computer range.
> They were designed by a partnership of Acorn Risc Machines (ARM),
> Motorola and IBM.
> The instruction set is very compact, therefore easy to learn. Most
> coders built up libraries of standard routines quickly and easily.
> I assume that they have not really seen any need for any massive
> increase in the instruction set, but I haven't seen anything about them
> for quite some number of years, so I really don't know.
> Multi-core ARM's now, that would be something else - I predict that may
> be in Apple's future.

I wouldn't call the ARM's native instruction set "compact". It's actually
fairly space-inefficient, which is why they later invented the Thumb
instruction set for the ARM7 processor. It gives up some of the complete
orthogonality of the ARM instructions for better code density.


Ciao,               Paul D. DeRocco
Paul                mailto:pderocco at

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