Re: basic question about cps
Wed, 21 Nov 2012 09:27:46 -0800 (PST)

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Related articles
basic question about cps (2012-11-12)
Re: basic question about cps (2012-11-14)
Re: basic question about cps (Stefan Monnier) (2012-11-14)
Re: basic question about cps (2012-11-21)
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Newsgroups: comp.compilers
Date: Wed, 21 Nov 2012 09:27:46 -0800 (PST)
Organization: Compilers Central
References: 12-11-004 12-11-010
Keywords: analysis, administrivia
Posted-Date: 21 Nov 2012 14:04:43 EST

On Wednesday, November 14, 2012 4:13:52 PM UTC, Stefan Monnier wrote:
> > It seems to me that if one performs the cps transformation one is left
> > with many 'computed' calls (that is call to variables holding
> > procedure values, namely, the continuation).
> Yes. Every additional "computed call" (aka indirect call) corresponds
> to a "return" in the non-CPS version of the code.
> > It seems that compiling such 'computed' calls would be much slower
> > than compiling 'direct' calls to known procedures.
> That's the wrong comparison: the non-CPS version wouldn't see direct
> calls there, but would see `return's instead.

> Also, you're talking about "compiling" being "slower": are you really
> concerned about the speed of compilation, or the speed of the
> generated code?

> The performance of "return" versus "indirect call" depends on many
> factors, but it's probably important to try and make sure that the
> "return-like indirect calls" are compiled to code which the CPU
> recognizes as "some sort of return", in order for the
> branch-prediction to work better (CPUs keep an internal&hidden stack
> to try and predict the destination of return instructions).

Thanks very much for all your replies!

Best regards,

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