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From: bzs@bu-cs.UUCP (Barry Shein)
Newsgroups: net.lang.c
Subject: Re: Right shift vs. divide
Message-ID: <820@bu-cs.UUCP>
Date: Mon, 23-Dec-85 17:35:13 EST
Article-I.D.: bu-cs.820
Posted: Mon Dec 23 17:35:13 1985
Date-Received: Wed, 25-Dec-85 03:29:57 EST
References: <974@brl-tgr.ARPA>
Organization: Boston Univ Comp. Sci.
Lines: 19

>BTW, is >> defined to be a sign-extended shift or a zero extended shift
>and under what circumstances.
>  
>                                    Paul
>                                    Schauble @ MIT-Multics

It should be controlled by the types of the things being shifted,
not the operator:

	int foo, bar ;
	unsigned int thing, stuff ;

	foo = foo >> bar ;
	thing = thing >> stuff ;

Expect the former to generate signed shift and the latter to generate
an unsigned, casts are often useful to accomplish this.

	-Barry Shein, Boston University