Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!utgpu!water!watnot!watmath!clyde!rutgers!husc6!seismo!allegra!kak
From: kak@allegra.UUCP
Newsgroups: comp.arch
Subject: varargs and register windows
Message-ID: <6575@allegra.UUCP>
Date: Mon, 6-Apr-87 10:22:02 EST
Article-I.D.: allegra.6575
Posted: Mon Apr  6 10:22:02 1987
Date-Received: Wed, 8-Apr-87 05:16:11 EST
Distribution: world
Organization: AT&T Bell Laboratories, Murray Hill
Lines: 15

How do machines with register windows, e.g. RISC I/II,
handle variable length argument lists?  RISC I has
6 registers for incoming arguments (R26 - R31).  What happens
if the caller has more than 6 arguments?

Also, in C, its common practice to treat the passed arguments
as memory, i.e. pointing at them with an (int *) and then using
(++) to walk through them as an array.
How does this work if the arguments are in registers?

Do MIPS, Clipper, and the new AMD micro have the same problems?

Thanks,
Keith Kelleman
allegra!kak