Re: CMUCL18d on Alpha? - Naggum cll archive

Subject: Re: CMUCL18d on Alpha?
From: Erik Naggum <erik@naggum.net>
Date: Tue, 23 Apr 2002 17:36:33 GMT
Newsgroups: comp.lang.lisp
Message-ID: <3228572189632087@naggum.net>

* Raymond Toy
| I do think it is a small problem in lisp where 
| 
|    (= (1+ double-float-epsilon) 1)
| 
| may or may not be T depending on whether there was a store between the
| comparison or not.

  Hm.  Neither Allegro CL, CMUCL, or CLISP manage to distinguish 1d0 from
  (1+ double-float-epsilon), but with an identical epsilon, LispWorks does.

  (scale-float double-float-epsilon (float-precision double-float-epsilon))
  should in theory be identical to (1+ double-float-epsilon), but couriously,
  (1- (scale-float ...)) yields a value twice as big as the epsilon.  This
  is really weird."
  
///
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