Path: utzoo!attcan!uunet!snorkelwacker!mit-eddie!bbn.com!nic!bunny!softg!amoore
From: amoore@softg.uucp
Newsgroups: comp.lang.c
Subject: Re: What C compilers have non-zero null pointers?
Message-ID: <13520@softg.uucp>
Date: 12 Jul 90 11:37:44 GMT
References: <422@minya.UUCP> <1990Jul10.141208.24902@uunet!unhd>
Organization: SofTech, Waltham MA
Lines: 9

In article <1990Jul10.141208.24902@uunet!unhd>, pas@uunet!unhd (Paul A. Sand) writes:

> "Certain Prime computers use a value different from all-bits-0 to
> encode the null pointer. 

The Prime 50 series (segmented) architecture has a segment 0.  A null
pointer on a Prime is segment 7777 location 0 (usually written 7777/0).
The C compiler (written by Garth Conboy of Pacer Software) deals with
comparisons to 0.