Path: utzoo!news-server.csri.toronto.edu!cs.utexas.edu!asuvax!noao!amethyst!zeus!erik
From: erik@zeus.uucp (Erik Schumacher)
Newsgroups: comp.sys.next
Subject: Trigonometric Functions and Math Library
Message-ID: <2493@amethyst.math.arizona.edu>
Date: 3 Mar 91 08:16:21 GMT
References: <PFKEB.91Mar2203417@ebnextk.SLAC.Stanford.EDU>
Sender: news@amethyst.math.arizona.edu
Reply-To: erik@zeus.UUCP (Erik Schumacher)
Distribution: comp.sys.next
Organization: Optical Sciences Center, Tucson, AZ
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I wonder if anyone has made some effort to speed up the 68040 performance
with respect to the evaluation of trigonometric functions.  As far as I 
understand, the 040 does not have any trig. fctns 'build in', and therefore
the normal routines from the math library are called.  A friend who had 
similar problems on the sun, recommended to write a 040 specific routine
for each trig. fctn., and to generate a inline function at each function 
call.  Because trig. fctns. are essential for many programs, and because
the normal evaluation is really slow compared to the overall speed of the 
040, I guess there is a good incentive to do some tune up.  - Only that I
don't know enough to do it .....