Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!uunet!pilchuck!dataio!bright
From: bright@Data-IO.COM (Walter Bright)
Newsgroups: comp.lang.c
Subject: Re: Pointer arithmetic and comparisons.
Message-ID: <2241@dataio.Data-IO.COM>
Date: 13 Dec 89 21:23:56 GMT
References: <257ECDFD.CDD@marob.masa.com> <232@bohra.cpg.oz> <2908@murtoa.cs.mu.oz.au>
Reply-To: bright@dataio.Data-IO.COM (Walter Bright)
Organization: Data I/O Corporation; Redmond, WA
Lines: 8

In article <2908@murtoa.cs.mu.oz.au> rob@murtoa.UUCP (Robert Wallen) writes:
<Now a beef.  Why check for (p <= pend)?  Why not just ( p == pend) ?
<After all,
<its not as though your code might accidentally skip over the last entry !!

(p <= pend) generates more efficient code (on PC's) than (p == pend), because
on the former only the offset portions of the pointer need to be compared,
while on the latter both the segment and the offset must be compared.