Path: utzoo!utgpu!watmath!clyde!att!rutgers!mcnc!xanth!hoptoad!dasys1!rodd
From: rodd@dasys1.UUCP (Rod Dorman)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Aztec compiler ineffeciencies
Summary: shifts only work for positive values
Message-ID: <7949@dasys1.UUCP>
Date: 26 Nov 88 04:33:46 GMT
References: <3013@sugar.uu.net>
Reply-To: rodd@dasys1.UUCP (Rod Dorman)
Organization: What me organized ?!
Lines: 13

In article <3013@sugar.uu.net> karl@sugar.uu.net (Karl Lehenbauer) writes:
>I've been examining the output of Aztec 3.6a and have discovered that it does
>no optimization on divides, such as turning divides by constants into shifts
>	asr.l	#1,d4
As many compiler writers have found in the past and I'm sure many will
rediscover in the future, this only works for positive values.  Try
shifting -1 and you'll get -1 as a result, *not* zero as one would expect.

					-- Rod --

Rod Dorman				{sun!hoptoad,cmcl2!phri}!dasys1!rodd
Big Electric Cat Public Unix
	"The ships hung in the sky in much the same way that bricks don't"