Path: utzoo!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!caen!uwm.edu!bionet!agate!ucbvax!RPITSMTS.BITNET!USERALVE
From: USERALVE@RPITSMTS.BITNET (Brian Eliot)
Newsgroups: comp.lang.asm370
Subject: Re: Why use an LA instruction?
Message-ID: <9103072233.AA20162@ucbvax.Berkeley.EDU>
Date: 7 Mar 91 22:31:46 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Reply-To: IBM 370 Assembly Programming Discussion List
              <ASM370@OHSTVMA.BITNET>
Distribution: inet
Organization: The Internet
Lines: 12

If the instruction

         LA    x,0(0,x)

is understood to mean "zero all non-address bits in register x" then
it works perfectly well for all addressing modes and all operating
systems.  In fact it is the best way to accomplish this since it
automatically adjusts to the addressing mode being used.

Brian Eliot
Information Technology Services
Rensselaer Polytechnic Institute