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echo: os2prog
to: Jonathan De Boyne Pollar
from: Rob Basler
date: 1994-12-02 10:17:00
subject: Need sqrt() algorithm

JDBP>RB>
JDBP>  >               I don't want to use the standard C sqrt()
JDBP>  > function because I am not using floating point for anything
JDBP>  > else.
JDBP>RB>

JDBP>  It doesn't matter whether you are or you aren't.  Worrying about
JDBP>  avoiding floating point doesn't actually gain you very much under
JDBP>  OS/2.  It's DOS-think.

Actually, I am doing a considerable amount of "floating point" math
using fixed point integer math to do 3-D projections.  The reason I
don't want to use floating point is that integer math is faster than
floating point EVEN WITH A COPROCESSOR especially for addition and
subtraction, without a coprocessor and running software emulation like
OS/2 provides, performance really goes into the toilet.  I am using 32
bit integers to represent floating point values, I don't need tons of
precision, but I do need **SPEED**, and this gives it to me.  If you are
interested in a discussion of fixed point mathematics, check out
"Flights of Fantasy" by Christopher Lampton, it is a "how
to" book on
flight simulators.

Rob.
___
 X SLMR 2.1a X All wiyht.  Rho sritched mg kegtops awound?

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