From: Robert Cattral
Subject: Protected Arithmatic Functions
Message-ID: <5gik3k$>
Just wondering if anybody has a set of protected arithmatic functions
written for CLISP.  I'm using the DOS version, with highest exponent = 708.

I tried a few routines from MCL, but the capacities seem to vary too much.
For example: (+ 2.0 5.5E37) works fine, but (+ 2.0 5.5E38) blows up.

Also, something very interesting: the MOST-POSITIVE_DOUBLE-FLOAT has a log
of 709.xxxxx, however if you try (exp 708) it blows up. So the following piece
of code does not work, when under MCL it does:

(exp (floor (log MOST-POSITIVE-DOUBLE-FLOAT)))

Upon further examination, I found that exp has a unpper boundary of 88, and
a lower boundary of -88.  

So rather than go testing all of the boundaries, I thought that I'd ask
to see if anybody else (probably working on GP) has done it yet.


::: Rob Cattral                                  :::
:::                                              :::
::: ·····@Freenet.Carleton.Ca                    :::