[PATCH] Also optimize case-lambda using rest-cdr mechanism (#1623)

[Peter Bex]

Hi all,

I had a quick look at improving case-lambda handling, and to my surprise
that was very easy to do.  All the rest-cdr tracking is already in place,
and case-lambda basically expands to a rest lambda which dispatches on
the length of the rest arg and then picks it apart.  The arguments
themselves are already handled correctly by ##core#rest-car, so the only
thing that was getting in the way of optimizing away the consing of the
rest list was the (length rest-list) call at the top!

The attached patch simply adds another core form ##core#rest-length which
is optimized away to check the "c" argument in the C code which indicates
the length of the argvector instead of taking the length of the rest list
variable.

Cheers,
Peter

0001-Add-new-core-rest-length-form-which-speeds-up-case-l.patch
Description: Text Data

signature.asc
Description: PGP signature