Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!uunet!husc6!mit-eddie!ll-xn!ames!nrl-cmf!cmcl2!brl-adm!brl-smoke!gwyn From: gwyn@brl-smoke.ARPA (Doug Gwyn ) Newsgroups: comp.lang.c,comp.sys.ibm.pc Subject: Re: What's Wrong here? Message-ID: <6767@brl-smoke.ARPA> Date: Tue, 1-Dec-87 06:14:00 EST Article-I.D.: brl-smok.6767 Posted: Tue Dec 1 06:14:00 1987 Date-Received: Fri, 4-Dec-87 05:08:10 EST References: <278@westmark.UUCP> <6755@brl-smoke.ARPA> <6855@sunybcs.UUCP> <6761@brl-smoke.ARPA> <312@etn-rad.UUCP> Reply-To: gwyn@brl.arpa (Doug Gwyn (VLD/VMB)) Organization: Ballistic Research Lab (BRL), APG, MD. Lines: 21 Xref: mnetor comp.lang.c:5669 comp.sys.ibm.pc:10656 In article <312@etn-rad.UUCP> jru@etn-rad.UUCP (John Unekis) writes: -In article <6761@brl-smoke.ARPA> gwyn@brl.arpa (Doug Gwyn (VLD/VMB) ) writes: ->In article <6855@sunybcs.UUCP> ugfailau@joey.UUCP (Fai Lau) writes: ->>In article <6755@brl-smoke.ARPA> gwyn@brl.arpa (Doug Gwyn (VLD/VMB) ) writes: ->>That is, when the sign bit is turned on as ->>a result of bit shifting, it can not be turned off again,...... ->Is this REALLY true of the 80*86 family? If so, it's the only ->architecture I've ever heard of that behaves this way...... -No, It is not true. I think Doug was confused by the difference between a -logical shift instruction, and an arithmetic shift. ... I'm afraid I confused you by including one too many "... writes:" lines. I (Doug) am well aware of the differences between types of shifts. However, Fai Lau posted a fascinating "correction" to my correct response, claiming a new and unusual form of brain damage, presumably for the 80*86 architecture (since these messages have been cross-posted to comp.sys.ibm.pc). -I am not particularly fond of intel 80?86 hardware, but they are not -THAT bad. I didn't think it could really be..