delorie.com/archives/browse.cgi   search  
Mail Archives: djgpp/2001/05/22/06:30:13

From: Hans-Bernhard Broeker <broeker AT physik DOT rwth-aachen DOT de>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Generating Exponents FAST!
Date: 22 May 2001 10:26:49 GMT
Organization: Aachen University of Technology (RWTH)
Lines: 20
Message-ID: <9edet9$hev$1@nets3.rz.RWTH-Aachen.DE>
References: <0q9kgtgddkvj69od8094172vodtrpubgsh AT 4ax DOT com>
NNTP-Posting-Host: acp3bf.physik.rwth-aachen.de
X-Trace: nets3.rz.RWTH-Aachen.DE 990527209 17887 137.226.32.75 (22 May 2001 10:26:49 GMT)
X-Complaints-To: abuse AT rwth-aachen DOT de
NNTP-Posting-Date: 22 May 2001 10:26:49 GMT
Originator: broeker@
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

Radical NetSurfer <radsmail AT juno DOT com> wrote:

>  pow(10, ep);  is one obvious approach

> Which requires the time and computational overhead of whatever
> is involved in  pow() function....

... which may easily be faster than anything you could come up with.
Go figure before you make blind assumptions about the quality of
library code --- you do have access to all the sources, so why not
peek into them to check for yourself?

> IS THERE A MORE DIRECT ROUTE to generating 10 ^ ep?

Of course: e.g. to not generate them at all. Precompute a table of
such values, if you really only need so few of them.

-- 
Hans-Bernhard Broeker (broeker AT physik DOT rwth-aachen DOT de)
Even if all the snow were burnt, ashes would remain.

- Raw text -


  webmaster     delorie software   privacy  
  Copyright © 2019   by DJ Delorie     Updated Jul 2019