Thank you,
Bata
Have you tried your IDE's source lookup facilities? (of course you
need SBCL's sources on your system). Eg in Emacs, M-. on
sb-kernel:two-arg-+ takes me to (two-arg-+/- two-arg-+ + add-bignums),
above that is the macro used to define the operation.
That said, I have rarely needed to look at the source of these things in
SBCL. Profiling, benchmarking and compiler hints [which you can get with
(declaim (optimize (speed 3))), or similar declarations for individual
functions] would be the first things I consider.
HTH,
Tamas
Thanks,
Bata