[jhc] Re: Substitutions.

Lemmih lemmih at gmail.com
Sat Feb 23 09:54:39 EST 2008

On Sat, Feb 23, 2008 at 3:52 PM, Lemmih <lemmih at gmail.com> wrote:
> Hiya,
>  I've encountered something I don't understand in E.Subst.
>  The substitution routine is very eager to inline stuff. It inlines all
>  the simple applications it can find.
>  Consider the following example:
>  (\a -> a+a) expensive
>  The substitution routine will inline that to:
>  expensive+expensive
>  Wouldn't it be prudent to generate this instead:
>  let a = expensive in a + a
>  Whether to inline it further would be decided later on.

Actually, it might be wise not to do any optimizations in the
substitution routine. I assume constant applications are handled
elsewhere as well?


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