[ic] Iterations slow with mv_matchlimit incrementations

[Grant]

> I have a somewhat complex chunk of IC code about 500 lines long.  If I
> set the mv_matchlimit of the main loop to a small number, each
> iteration takes less than a second to execute.  However, as I increase
> the mv_matchlimit, each iteration takes longer to execute until it's
> quite slow.  I've been over my code again and again but I can't find a
> cause for this behavior.  The only clue I have is that each iteration
> executes much faster when the loop is almost done with all of its
> iterations.
>
> I'm wondering if the problem is "under the hood" of IC.  Does this
> scenario ring a bell for anyone?
>
> Thanks,
> Grant

I'm baffled by this.  I have no idea why increasing mv_matchlimit
would drastically increase the amount of time required for *each* loop
iteration.  Please let me know if you have any ideas.

- Grant