Hi, we have (defsubst cadr (x) "Return the car of the cdr of X." (car (cdr x)))
And if we use that, for example, in (defun woozle (blurb) (cadr blurb)) then the byte compiler delivers the result: byte code for woozle: args: (blurb) 0 varref blurb 1 dup 2 varbind x 3 cdr 4 car 5 unbind 1 6 return The binding for x is completely unnecessary and wasteful. FWIW, the XEmacs byte compiler does not do this unnecessary binding. I think that the byte compiler should be smart enough to remove unnecessary bindings from defsubst stuff consisting purely of side-effect free primitives and substitutions: those are not likely to be advised, and if they are, one can still mark them as non-side-effect free after the advice is activated. -- David Kastrup, Kriemhildstr. 15, 44793 Bochum _______________________________________________ Emacs-devel mailing list Emacs-devel@gnu.org http://lists.gnu.org/mailman/listinfo/emacs-devel
