On Thu, Jan 28, 2010 at 1:09 AM, Waldek Hebisch <firstname.lastname@example.org>
If ECL's consing numbers have anything common with reality, then
ECL is consing too much. AFAIK sbcl bignum routines takes a lot
of effort to allocate temporaries on stack, so only final results
of arithmetic operations are allocated on the heap.
I think you are attributing too much cleverness to SBCL. A simple disassembly of the code shows that SBCL is all the time calling GENERIC-* and GENERIC-+ that allocate data in the ordinary heap.