Re: C Time Trials/Comparison

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#83

From: TMOTA
Date: Wed, 29 Jul 1992 07:24

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amell@nyx.cs.du.edu (Andrew P.Mell) writes:

>integer multiply is compared to the integer divide. Why is the float
>multiply faster than add/subtract?

Because to multiply floats, you multiply the mantissas, and ADD the
exponents, while to +/-, you have to normalise first... The normalisation
process is a lot slower than the whole multiply process...
-- 
_________________  "I'd like to answer this question in two ways:
  /____ _ _/_ __       First in my normal voice, and then
 // / //_//_ /_/       in a silly, high-pitched whine." (Monty Python)

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Path: arc1-ca.pugleaf.net!sparky!uunet!comp.vuw.ac.nz!waikato.ac.nz!aukuni.ac.nz!cs18.cs.aukuni.ac.nz!jwil1
Newsgroups: comp.sys.acorn.tech
Subject: Re: C Time Trials/Comparison
Message-ID: <1992Jul29.072449.12638@cs.aukuni.ac.nz>
From: jwil1@cs.aukuni.ac.nz (TMOTA)
Date: Wed, 29 Jul 1992 07:24:49 GMT
Sender: jwil1@cs.aukuni.ac.nz (TMOTA)
References: <1992Jul28.024814.1386@mnemosyne.cs.du.edu>
Organization: Computer Science Dept. University of Auckland
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