Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.1 6/24/83; site allegra.UUCP
Path: utzoo!watmath!clyde!burl!ulysses!allegra!alan
From: alan@allegra.UUCP (Alan S. Driscoll)
Newsgroups: net.lang.c
Subject: Re: Pointer -> Long Conversion
Message-ID: <2643@allegra.UUCP>
Date: Wed, 25-Jul-84 13:41:59 EDT
Article-I.D.: allegra.2643
Posted: Wed Jul 25 13:41:59 1984
Date-Received: Fri, 27-Jul-84 04:48:06 EDT
References: <10@ism780b.UUCP>, <3834@fortune.UUCP>, <3481@brl-tgr.ARPA>
Organization: AT&T Bell Laboratories, Murray Hill
Lines: 18

> This discussion of sign extending pointers when converting to longs
> has got me wondering what the Prime C compiler does when extending a
> long into a pointer.  Pointers are the longest type on this compiler:
> 48 bits, while long, int, and unsigned are all 32 bits.  This breaks
> all programs that assume pointers can be assigned to longs and recovered
> unchanged.  Only char pointers need more than 32 bits,  but the compiler
> author decided to make all pointers 48 bits anyway.  I'll investigate
> this and report back if anyone is interested.  

If this is the case, then the Prime compiler is just wrong.  See section
14.4 of the C Reference Manual, "Explicit pointer conversions."  At least
one of the integral types must be large enough to hold a pointer.

-- 

	Alan S. Driscoll
	AT&T Bell Laboratories