From:	aho450s AT nic DOT smsu DOT edu (Tony O'Bryan)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Fixed Point (Optimization)
Date:	Sat, 04 Jan 1997 22:39:23 GMT
Organization:	Southwest Missouri State University
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Message-ID:	<32cedb2d.17212822@ursa.smsu.edu>
References:	<32cd6b2c DOT 4726585 AT nntp DOT southeast DOT net> <01b9bb84$bc3275a0$e2c5b7c7 AT platko DOT ix DOT netcom DOT com>
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To:	djgpp AT delorie DOT com
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On 4 Jan 1997 03:39:34 GMT, "Bob Platko" <platko AT ix DOT netcom DOT com> wrote:

>Fixed Point math is still very essential for dramatic speed increasement
>even with today's FPU's.  I never bench marked Fixed Point compared to
>floating point, so I don't know how much faster it will be; it depends on
>how often you use it.  A lookup table will most likely increase your speed.

I did a quick check on floating point vs. integers not too long ago.
I wrote a small loop that only added an integer to an integer counter,
then rewrote it using floating point variables.  On my Pentium 120,
integers were THOUSANDS of times faster.  I don't remember the exact
numbers, but 50,000 loops required a few seconds with the floating
point.  The integers were so fast that the timer (calculated to
several digits [7 or 8, I think]) couldn't register the elapsed time.

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