Re: must read Apple's new iPhone/iPad OS 4 developer's agreement

[Dave Farber <dave () farber net>]

Begin forwarded message:

> From: "Dean F. Sutherland" <dfsuther () cs cmu edu>
> Date: April 11, 2010 11:05:43 AM EDT
> To: dave () farber net
> Subject: Re: [IP] Re:    must read  Apple's new iPhone/iPad OS 4  
> developer's agreement

> For IP, if you think it's relevant...
>
> I must take issue with George Ou's comment! There's actually no  
> FUNDAMENTAL reason why C and C++ "run a lot faster than the other  
> higher level languages." In fact, the higher level languages provide  
> the opportunity for substantially improved performance -- if the  
> compilers make good use of the additional semantic information that  
> could be available to them.
>
> Back when I worked as an optimizing compiler engineer, our Ada  
> compiler routinely provided better code than any C or C++ compiler  
> for the same targets -- including our own C++ compiler! Better code,  
> in this context, means either "same size, but much faster" or "same  
> speed, but much smaller" or "moderately smaller AND moderately  
> faster" depending on optimization settings. The key advantage  
> provided by Ada was that its stronger type checking and its tighter  
> semantic model provided additional information to the optimizer. An  
> optimizer that was prepared to USE that additional information could  
> beat the pants off one that only had C or C++ to work with. And we  
> routinely did.
>
> By comparison, if your compiler's optimizer is primarily focussed on  
> C and C++ (I'm thinking of GCC in the late '90s here!) you'll never  
> see this effect.
>
> Dean
>
> On Apr 10, 2010, at 3:43 PM, David Farber wrote:
>
> > From: George Ou <George.Ou () digitalsociety org>
> > Date: April 10, 2010 12:53:42 AM EDT
> > To: "dave () farber net" <dave () farber net>, "shap () eros-os org" <shap () eros-os org 
> > >
> > Subject: RE: [IP] must read Apple's new iPhone/iPad OS 4  
> > developer's agreement
> >
> > I’m not a fan of Apple and it’s obvious they’re extremely  
> > closed, but I must point out that C and C++ run a lot faster than  
> > the other higher level languages.  uTorrent for example was writte 
> > n in very tight C code and it took over the BitTorrent market in a 
> >  matter of months because people value tight/fast code.
> >
> >
> >
> > George



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