From: Tom Moran <tmoran@bix.com>
Subject: Re: Fixed-point
Date: 1997/03/28
Date: 1997-03-28T00:00:00+00:00 [thread overview]
Message-ID: <333C27FB.73B7@bix.com> (raw)
In-Reply-To: 333C08A7.446B9B3D@innocon.com
> Jack Crenshaw's "Programmer's Toolbox" column in *Embedded Systems
> Programming* has been discussing
> ...
> fixed-point operations are so slow in Ada
He apparently once tried Ada in the early '80s and has been repeating
obsolete nonsense ever since. Clearly if you define a 35 bit fixed
point field, and your compiler lets you, arithmetic will be a bit slow,
just like asm or C++. But a reasonable size, say 16 or 32 bits, will be
fast. I've used it often when the target was Intel hardware with no
floating point. +- are as fast as the corresponding integer operations
and */ are a heck of a lot faster than emulated floating point. There
are also things, such as RGB values, that cry out to be fixed point
fractions rather than integers from 0 .. 255, or 0 .. 64, or whwatever.
next prev parent reply other threads:[~1997-03-28 0:00 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
1997-03-28 0:00 Fixed-point Jeff Carter
1997-03-28 0:00 ` Fixed-point Robert Dewar
1997-03-29 0:00 ` Fixed-point the one and only real true kibo
1997-03-28 0:00 ` Tom Moran [this message]
1997-03-29 0:00 ` Fixed-point Robert A Duff
1997-03-30 0:00 ` Fixed-point Larry Kilgallen
1997-04-11 0:00 ` Fixed-point Ken Garlington
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