[ANSI-Smalltalk] Agenda items...

[Andres Valloud]

A non finalized copy can be obtained from:

http://en.wikipedia.org/wiki/ISO/IEC_10967

Thanks,
Andres.

On Nov 14, 2007 3:58 PM, Andres Valloud <andres.valloud at gmail.com> wrote:

> Does anybody know where to find a viewable copy of ISO/IEC 10967?  I see
> it refers to language independent arithmetic...
>
> Andres.
>
>
> On Nov 14, 2007 3:55 PM, Andres Valloud < andres.valloud at gmail.com> wrote:
>
> > Paolo,
> >
> > Yes, the implementation here uses 1023 and -1022.  Hmmmm... I am not
> > sure about emax / emin being off by one though.  If the range goes from 0 to
> > 2047, and 0 and 2047 are taken, then that takes one off from each side, and
> > 1024 / -1021 do not balance out that way?...
> >
> > Andres.
> >
> >
> > On Nov 13, 2007 11:49 PM, Paolo Bonzini <paolo.bonzini at lu.unisi.ch >
> > wrote:
> >
> > > > fmax
> > > >     (1 - (self radix raisedTo: self precision negated))
> > > >         * (self radix raisedTo: self emax + 1)
> > > >
> > > >     Note the ANSI spec says
> > > >
> > > >     (1 - (self radix raisedTo: self precision negated))
> > > >         * (self radix raisedTo: self emax)
> > > >
> > > > fminDenormalized
> > > >     self radix raisedTo: self emin - self precision + 1
> > > >
> > > >     Note the ANSI spec says
> > > >
> > > >     self radix raisedTo: self emin - self precision
> > >
> > > I think you also have emin and emax off by one. :-)  The exponent
> > > field
> > > goes from 1 to 2046 for Doubles, since 0 is reserved for
> > > zero/denormals
> > > and 2047 for infinities/NaNs.
> > >
> > > Since the mantissa in LIA-1 is < 1, emax is 1024 and emin is -1021.
> > >  You
> > > probably are using 1023 and -1022.
> > >
> > > Then, if you put precision = 52 in this you do get an off-by-one
> > > error,
> > > which convinces me more that, as you said, the right value of
> > > precision
> > > should include the implicit 1.  So, no errata in
> > > <FloatCharacterization>
> > > right?
> > >
> > > Paolo
> > >
> > > _______________________________________________
> > > ANSI-Smalltalk mailing list
> > > ANSI-Smalltalk at lists.openskills.org
> > > http://lists.openskills.org/cgi-bin/mailman/listinfo/ansi-smalltalk
> > >
> >
> >
>
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