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From: Damien <Damien.Pous@ens-lyon.fr>
Cc: <caml-list@inria.fr>
Subject: Re: [Caml-list] partial eval question
Date: Mon, 27 Oct 2003 08:14:53 +0100	[thread overview]
Message-ID: <20031027081453.37b9f6ee.Damien.Pous@ens-lyon.fr> (raw)
In-Reply-To: <004a01c39c2b$819db8f0$1fcf2952@Archimedes>

On Mon, 27 Oct 2003 01:41:49 -0000 Ben Kavanagh wrote:

> Say I have a function such as pow defined as
> 
> let pow n x = 
>     let rec pow_iter (n1, x1, p1) = 
>         if (n1 = 0) then p1 
>         else if (n1 mod 2 = 0) 
> 		 then pow_iter(n1/2, x1*x1, p1) 
>              else pow_iter(n1-1, x1, p1*x1)
>     in pow_iter(n, x, 1);;
> 
> and I say 
> 
> let pow2 = pow 2
> 
> Are there any ML implementations that would automatically perform
> partial evaluation to create pow2 instead of using closures, possibly
> unfolding the pow_iter call? Would Caml ever have this capability?

Multi-Stage Programming is your friend...
<http://www.cs.rice.edu/~taha/MSP/>

There are two ML implementations :
Ocaml : MetaOCaml <http://www.cs.rice.edu/~taha/MetaOCaml/>
SML : MetaML <http://www.cse.ogi.edu/PacSoft/projects/metaml/>


let rec pow n = .< 
	.~(match n with
		| 1 -> .< fun x -> x >.
		| n -> .< fun x -> x * .~(pow (n-1)) x>.
	)
>.

(pow 3) get reduced into .<fun x -> x*x*x>.


Damien

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  reply	other threads:[~2003-10-27  7:12 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-10-27  1:41 Ben Kavanagh
2003-10-27  7:14 ` Damien [this message]
2003-10-27 15:39   ` William Chesters
2003-10-27 18:50     ` Andrew Lenharth
2003-10-27 19:12       ` William Chesters
2003-10-27 20:08         ` Jacques Carette
2004-02-04  3:03           ` Walid Taha
2003-10-27 22:11         ` Andrew Lenharth
2004-02-04  2:59       ` Walid Taha
2004-02-04  5:53         ` Andrew Lenharth
2004-02-05 21:29           ` Walid Taha
2003-10-27 19:17     ` Yann Regis-Gianas
2003-10-28 10:46       ` William Chesters
2004-02-04  2:22         ` Walid Taha
2004-02-04  2:56     ` Walid Taha
2003-10-28 15:09   ` Dmitry Lomov
2003-10-27 15:16 ` Vincent Balat [prof Moggi team]
2004-02-04  2:51 ` Walid Taha
2004-02-04 10:26   ` Ben Kavanagh
2004-02-04 10:32   ` Ben Kavanagh
2004-02-05 21:11     ` Walid Taha

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