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From: prener@arnor.uucp
Newsgroups: comp.unix.aix
Subject: Re: Invalid pointer traps (S/6000)
Keywords: Traps, NIL, NULL, invalid pointers
Message-ID: <1991Feb13.012239.24125@arnor.uucp>
Date: 13 Feb 91 01:22:39 GMT
References: <24518@neptune.inf.ethz.ch> <1991Feb12.033513.27494@athena.mit.edu>
Sender: news@arnor.uucp (NNTP News Poster)
Reply-To: prener@prener.watson.ibm.com (Dan Prener)
Organization: IBM T.J. Watson Research Center
Lines: 6

Actually, the compiler optimization takes advantage of the fact that location
0 is guaranteed to be readable and to contain a zero.  This permits pointer-based
loads to be done speculatively, on occasion, which, in turn can improve
the instruction scheduling.
-- 
                                   Dan Prener (prener @ ibm.com)