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From: "Jean-Pierre Rosen" <rosen@adalog.fr>
Newsgroups: comp.lang.ada
Subject: Re: Java portability (was: An Ada IDE and discussions)
Date: Thu, 26 Jul 2001 10:07:48 +0200
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Date: 2001-07-26T10:07:48+02:00
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"Florian Weimer" <fw@deneb.enyo.de> a �crit dans le message news: 874rs0pwbk.fsf@deneb.enyo.de...
> "Jean-Pierre Rosen" <rosen@adalog.fr> writes:
>
> >> Yes, I think so. Some people claim that the JVM support for floating
> >> point operations was designed so that it runs fast and correctly only
> >> on Sun's hardware. ;-)
>
> > What makes you think so ? The trouble is that Java *requires* IEEE
> > arithmetic.
>
> A particular incarnation of it.  For example, you can't use x86 80 bit
> extended precision floating point operations with the JVM.  OTOH,
> there is some double-extended-exponent type, and I would be suprised
> if no SPARC processor implemented it. ;-)

There is much more in IEEE arithmetic than the format of numbers. You have to support NaNs, infinities, and a lot of other stuff.
And of course, when I'm talking about adhering to a standard, I meant 100%. Being 95% conformant is sooooo much easier! Ask Ada
compiler vendors. (and the defunct Artek compiler, that never made it from 95% to 100%)

--
---------------------------------------------------------
           J-P. Rosen (rosen@adalog.fr)
Visit Adalog's web site at http://www.adalog.fr