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From: cfor%CIBA-GEIGY.CH@OHSTVMA.IRCC.OHIO-STATE.EDU ("", Rainer Foeppl)
Newsgroups: comp.lang.asm370
Subject: Re: Why use an LA instruction?
Message-ID: <9103071412.AA05842@ucbvax.Berkeley.EDU>
Date: 7 Mar 91 13:47:00 GMT
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==================

hello

the only effect of the la instruction is to clear bit 0-7, if you are in 24-
bit - addressing mode. if you are in 31-bit addressing mode, then it clears
only bit 0.

if you have any more questions, look at the ibm manual pricnciples of
 operation (sa22-7200-0). there you will find explanations to all valid
instructions of the ibm 370 and 390 architexture.

regards
rainer