[gambit-list] Viewing CPS expansion?

D.McClain dbm at asyrmatos.com
Fri May 22 16:04:35 EDT 2009


Dr. David McClain
Sr. VP, Embedded Systems
Asyrmatos Inc.
Boston & Tucson
phone: 	520-529-2437
cell: 	520-390-3995
web: 	www.asyrmatos.com
e-mail:	dbm at asyrmatos.com

On May 22, 2009, at 12:51, Taylor R Campbell wrote:

>    Date: Fri, 22 May 2009 12:45:59 -0700
>    From: "D.McClain" <dbm at asyrmatos.com>
>    Okay, you have my attention... let's see that isomorphism in
>    practice.
> I leave that as an exercise for the reader.
>    I have seen my own measurements, and invariably they produce code
>    that is 30% slower for CPS form than direct form. Perhaps the
>    compilers producing the actual native code have been tuned to look
>    for common human idioms and not CPS traits?
> The way you say that suggests to me that you are using the *same*
> compiler to compare a direct-style program with the same program
> converted to continuation-passing style.  Unless the compiler is
> extremely clever, it will probably generate worse code for the CPS
> form of the program, for the reason I explained in my first message.
> That's a very different question, however, from the question of how
> the use of a CPS intermediate representation affects the code that a
> compiler generates.

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