Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!purdue!haven!adm!smoke!gwyn
From: gwyn@smoke.BRL.MIL (Doug Gwyn)
Newsgroups: comp.lang.c
Subject: Re: Re^2: Another silly question
Message-ID: <10160@smoke.BRL.MIL>
Date: 29 Apr 89 02:08:54 GMT
References: <pointer> <array> <reference> <access> <element> <2459@nmtsun.nmt.edu> <10135@smoke.BRL.MIL> <1266@l.cc.purdue.edu> <4625@freja.diku.dk>
Reply-To: gwyn@brl.arpa (Doug Gwyn)
Organization: Ballistic Research Lab (BRL), APG, MD.
Lines: 11

In article <4625@freja.diku.dk> njk@freja.diku.dk (Niels J|rgen Kruse) writes:
-No. If you have pointers
-long *p1,*p2,*p3,*p4;
-with p1 <= p2 and p3 <= p4 and want to test (p2-p1) < (p4-p3),
-you can write
-if ((char *)p2 - (char *)p1 < (char *)p4 - (char *)p3)
-which won't generate any shifting.

That might generate shifting, depending on the implementation.
What you should write is simply
	if ( p2 - p1 < p4 - p3 )