Re: Dynamic Typing Efficiency

Yermat <loic@fejoz.net>
9 May 2005 22:30:04 -0400

          From comp.compilers

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Re: Dynamic Typing Efficiency gah@ugcs.caltech.edu (glen herrmannsfeldt) (2005-05-08)
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Re: Dynamic Typing Efficiency clearm@comcast.net (2005-05-13)
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From: Yermat <loic@fejoz.net>
Newsgroups: comp.compilers
Date: 9 May 2005 22:30:04 -0400
Organization: CIRIL, Nancy, France
References: 05-05-041
Keywords: types, interpreter

clearm@comcast.net wrote:
> I am writing a small, python-like scripting language that uses dynamic
> typing. I am also writing a stack-based virtual machine to go with
> it.
>
> I have read many papers and posts about improving the efficiency of
> VMs - for example by using threaded dispatch instead of switch
> statements.
>
> The problem I have is that dynamic typing seems to be extremely
> inefficient when you have a large number of types. For example, if I
> have integers, doubles, strings, booleans, and various compound types,
> then an ADD instruction would have to look like this:
>
> [snip]


You should have a look at all the work done around SmartEiffell
optimization and especially this paper : "Efficient Dynamic Dispatch
without Virtual Function Tables. The SmallEiffel Compiler."


http://smarteiffel.loria.fr/papers/papers.html#OOPSLA97


--
Yermat



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