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Re: floating point problems on amd64?

To: tech-userlevel%netbsd.org@localhost
Subject: Re: floating point problems on amd64?
From: Greg Troxel <gdt%ir.bbn.com@localhost>
Date: Tue, 05 Aug 2008 09:27:42 -0400

  In June, gdt wrote:

  I ran 'make check' on guile on NetBSD-current on amd64, and got a
  failure:

  guile> (version)
  "1.8.5"
  guile> (eqv? 0.0 (exp -inf.0))
  #f
  guile> (exp -inf.0)
  +nan.0

This was a libm bug, not a guile bug, and is now fixed, thanks to
Matthias and Christos.  One needs -current from 6/23 or more recent
(specifically in src/lib/libm/arch/i387/e_exp.S).

References:
- floating point problems on amd64?
  - From: Greg Troxel

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