Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!usc!srhqla!demott!kdq
From: kdq@demott.COM (Kevin D. Quitt)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: Faster 387s and 486 timing (was: Cyrix CX-803D87-20 Coprocessor)
Message-ID: <647@demott.COM>
Date: 2 Oct 90 21:52:55 GMT
References: <1990Oct2.133130.11674@maytag.waterloo.edu>
Reply-To: kdq@demott.COM (Kevin D. Quitt)
Organization: DeMott Electronics Co., Van Nuys CA
Lines: 16

In article <1990Oct2.133130.11674@maytag.waterloo.edu> dmurdoch@watstat.waterloo.edu (Duncan Murdoch) writes:
>  I wonder why the divides take so much integer cpu time 
>(70 cycles of it)?
>

    I believe that the CPU and FPU share the shifter.  FP uses the shifter
very frequently (e.g. any time it has two operands)


-- 
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Kevin D. Quitt         demott!kdq   kdq@demott.com
DeMott Electronics Co. 14707 Keswick St.   Van Nuys, CA 91405-1266
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