> From: "Amey Karkare" <[EMAIL PROTECTED]> > Date: Mon, 6 Mar 2006 17:00:43 +0530 > > [...] > > This is a possibility. However I thought it will be better - > performance wise - if I could modify the C-routine directly. I am > still a newbie to Scheme/mit-scheme and not very sure if modifying C > will actually be faster than modifying user program.
The car primitive is often compiled in-line -- just a machine instruction or three. If performance of the metered program is the issue, you might get by with an in-lined fixnum-increment primitive (3-4 instructions?) alongside every in-lined car primitive. Again, to do that, modify your definition of "car" (not the user program). > > Who-all's use of car and cdr do you want to measure? Surely not the > > whole system... ? > No, only the user program's. And any library routines (e.g. append) it calls? If so, they will need to be compiled for your modified "car" too. _______________________________________________ MIT-Scheme-users mailing list MIT-Scheme-users@gnu.org http://lists.gnu.org/mailman/listinfo/mit-scheme-users
