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From: rgenter@BBN-LABS-B.ARPA (Rick Genter)
Newsgroups: net.lang.c
Subject: Re: printf() code size using Astartup.obj and AMIGA.LIB only
Message-ID: <2054@brl-smoke.ARPA>
Date: Wed, 9-Jul-86 13:30:04 EDT
Article-I.D.: brl-smok.2054
Posted: Wed Jul  9 13:30:04 1986
Date-Received: Thu, 10-Jul-86 05:11:20 EDT
Sender: news@brl-smoke.ARPA
Lines: 15


     One point about your posting:

     You mention that the compiler should generate only one extend
instruction.  The MC68000 does not have an instruction to extend from
byte to long - you have to extend byte to word, then extend word to
long.  Of course, it's much better if it just generates TST.B (if
comparing against zero), or, as you pointed out, uses the condition
codes set from the MOV.B instruction which loaded the value in the
first place.
--------
Rick Genter 				BBN Laboratories Inc.
(617) 497-3848				10 Moulton St.  6/512
rgenter@labs-b.bbn.COM  (Internet new)	Cambridge, MA   02238
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