From: "Kurt Welgehausen" <kwel@kwel.net>
> > Are floting-point numbers heap-allocated in ocamlopt on sparc?
> 
> Yes, I believe FP values are boxed on all platforms. You could
> try keeping your values in an array, and see if that makes any
> difference.
> 
> Also, see <http://caml.inria.fr/archives/200501/msg00125.html>
> and related messages.

I see - so it seems to me that FP numbers are heap-allocated at least
when they are passed or returned as function arguments or results (to
support polymorphism, I suppose).  This explains well the behaviors of
ocamlopt (and its GC) that I've been experiencing.  Thanks for the
information!

	Eijiro