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Content-type: text/plain
Dear Robertm
although I'm not an assembler guru, I would like to
point you to GSL. As far as I know, the GSL (Gnu
Scientific Library) provides full support of the rounding
options of the FPU.
You might check their C code to get some clues.
Main page is
http://sources.redhat.com/gsl/
Reference manual is at
http://sources.redhat.com/gsl/ref/gsl-ref_toc.html
Source browsing at:
http://sources.redhat.com/cgi-bin/cvsweb.cgi/gsl/?cvsroot=gsl
I think the relevant stuff is in
http://sources.redhat.com/cgi-bin/cvsweb.cgi/gsl/ieee-utils/?cvsroot=gsl
hope that helps
Bernhard
----- Original Message -----
From: <robert.d.campbell{([at]})nowhere.xy
To: <blackbox{([at]})nowhere.xy
Sent: Monday, June 17, 2002 1:59 PM
Subject: Arithmetic rounding
>
>
> IEEE floating point defines four rounding modes:
>
> 'round to nearest'
> 'round to minus infinity'
> 'round to plus infinity'
> &
> 'round to zero'.
>
> I presume that Pentiums and Athlons support these options
> at the hardware level. I also presume (hope !) that Component
> Pascal operations *, /, +, - use the 'round to nearest' mode.
>
> I am contemplating writing some 'interval arithmetic' routines
> (for seriously safe calculations). To do this I would like routines
> for the four basic 64-arithmetic operations using each of the
> 'round to +/- infinity' modes.
>
> Is there anyone who has the required knowledge of Intel assembler
> prepared to give me some clues?
>
>
> Cheers
>
> Robert Campbell
>
> --------------------------------------------
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Received on Tue Jun 18 2002 - 19:48:09 UTC