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From: cmt@myrias.UUCP (Chris Thomson)
Newsgroups: net.lang.c
Subject: Re:  Two Birds with One Stone
Message-ID: <199@myrias.UUCP>
Date: Tue, 24-Dec-85 20:22:24 EST
Article-I.D.: myrias.199
Posted: Tue Dec 24 20:22:24 1985
Date-Received: Tue, 24-Dec-85 22:24:41 EST
References: <874@dataioDataio.UUCP> <864@kuling.UUCP>
Organization: Myrias Research, Edmonton
Lines: 8

> >Almost but not quite true. A compiler CANNOT normally replace a divide
> >by a right-shift if it is an integer divide. This is because a right
> >shift of a negative integer is not the same as a divide.
> 
> However most useable processors provide arithmetic shifts which will give
> the right result even if it is a signed divide.

The first is correct, the second is WRONG.  -1/2 is 0 not -1.