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From: PGIFFORD@ALLEGVM.BITNET (Pete Gifford)
Newsgroups: comp.lang.asm370
Subject: Why use an LA instruction?
Message-ID: <9103050049.AA15223@ucbvax.Berkeley.EDU>
Date: 4 Mar 91 10:38:14 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Reply-To: IBM 370 Assembly Programming Discussion List
              <ASM370@OHSTVMA.BITNET>
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I was disassembling a program (not copyrighted!) a while ago and found it
starting with the instructions below.  I understand all of it but the LA.
Can someone shed some light on its purpose?
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Pete Gifford           PGIFFORD@ALLEGVM
Systems Manager        PETE@MUSIC.ALLEG.EDU
Allegheny College      (814) 332-5304
Meadville, PA          (814) 332-5366


PROGRAM  BALR  4,0                load base register
         BCTR  4,0                back off one byte to point
         BCTR  4,0                to label at start of program
         LA    4,0(0,4)           ???????