From: utzoo!decvax!cca!gwyn@Brl@sri-unix
Newsgroups: net.unix-wizards
Title: Re:  pcc and uldiv for V7 PDP11
Article-I.D.: sri-unix.4288
Posted: Sun Nov 21 18:25:29 1982
Received: Mon Nov 22 04:43:45 1982

From:     Doug Gwyn <gwyn@Brl>
Date:     19 Nov 82 14:04:57-EST (Fri)
uldiv & ulrem implement run-time support for unsigned long division & mod.
All of the run-time arithmetic modules were bug-fixed for System III,
and a few were added (uldiv,ulrem,udiv,urem).

The stack frame is the same on PDP-11 System III as on V7, as is cret.
However,
	jsr	r0,csav
is generated instead of the V7
	jsr	r5,csv
in order to solve a problem with interrupting csv (the new one is also
slightly faster).  Support for both is in the System III library, and
both old-compiled and new-compiled object modules can be mixed in one
executable image.