[ clisp-Bugs-1534214 ] Unexpected Floating Point Error

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Bugs item #1534214, was opened at 2006-08-03 16:18
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Category: clisp
Group: lisp error
Status: Open
Resolution: None
Priority: 5
Submitted By: drb (al_hallaj0)
Assigned to: Bruno Haible (haible)
Summary: Unexpected Floating Point Error

Initial Comment:
The mathematical expression below generates a floating
point overflow error.

(* 2.5d0 (EXP (* 251.1 (EXP (- 1.089 (* 1.12 (LOG
80.9647d0 10)))))) (EXP (/ (- 183.9) 199.705d0)))

However the following one does not.

(* (EXP (* 251.1 (EXP (- 1.089 (* 1.12 (LOG 80.9647d0
10)))))) (EXP (/ (- 183.9) 199.705d0)) 2.5d0)

The only difference is that the 2.5 has been shifted
from the front of the list to the end of it.

The bug shows up on at least two recent versions of CLISP.

CLISP version information:

GNU CLISP 2.38 (2006-01-24) (built on guru.build.karan.org)
Software: GNU C 3.4.4 20050721 (Red Hat 3.4.4-2)

GNU CLISP 2.39 (2006-07-16) (built on
hammer2.fedora.redhat.com)
Software: GNU C 4.1.1 20060525 (Red Hat 4.1.1-1)


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