[m-rev.] diff: more :- import_module updates, and tree.m

[Julien Fischer]

On Thu, 24 Mar 2005, Zoltan Somogyi wrote:

> compiler/tree.m:
> 	Fix a performance problem I noticed while update :- import_module
> 	items. Instead of supplying a function to convert lists of trees
> 	to a tree, make the tree data structure able to hold a list of
> 	subtrees directly. This reduces the number of times where we have to
> 	convert list of trees to trees that are sticks just to stay within
> 	the old definition of what a tree is.

Does this make a noticeble difference?  If so, do you have figures
to hand?

Julien.
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