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From: phil@hansen.Berkeley.EDU (Phil Graham)
Newsgroups: comp.sys.m88k
Subject: Re: floating point exceptions
Message-ID: <2837@lupine.NCD.COM>
Date: 30 Nov 90 17:09:01 GMT
References: <1990Nov29.084840.5410@Neon.Stanford.EDU> <13899@june.cs.washington.edu>
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Reply-To: phil@hansen.Berkeley.EDU (Phil Graham)
Followup-To: kevin,greg
Lines: 40

I read this... Do we care?
Phil

In article <13899@june.cs.washington.edu>, robertb@cs.washington.edu
(Robert Bedichek) writes:
|> In article <1990Nov29.084840.5410@Neon.Stanford.EDU>
sean@Neon.Stanford.EDU (Sean Quinlan) writes:
|> >I am trying to code a simple exception handler for the two floating
|> >point exceptions.  The 88100 manual states that there are routines from
|> >Motorola that do the default IEEE processing.  Has anyone used these?
|> 
|> Yes, they are in the Tektronix and Motorola kernels, as well as at
|> least one Mach port that I know of.  My guess is that they are in
|> everyone's 88k kernel.
|> 
|> >Are they public domain?  If not, does anyone have any code they can give
|> 
|> I doubt that they are in the public domain.  I suggest that you ask
|> Moto's MCD (Microcomputer Division) in Tempe Az. for them.  Maybe
|> they'll just give them to you.  They were originally developed by the
|> chip folks in Austin Texas, but my guess is that it is no maintained
|> in Tempe.
|> 
|> >me?  I probably do not need full IEEE conformance, just enough so that
|> >resonable results are produced when I start running out of precision
instead
|> >of taking the exception and crashing.  Having code to do the right thing
|> >with infitity, NaN etc would be nice but not essential.
|> 
|> They do all sorts of things besides obscure IEEE conformance.  Like,
|> they fix up floating to integer conversions that sometimes trap even
|> when the operand is not out of range.
|> 
|> This code is all in assembly and very tricky.  I highly recommend that
|> you get it from Motorola.
|> 
|> >Many thanks
|> >sean quinlan
|> 
|> 	Rob Bedichek   robertb@cs.washington.edu