[Numpy-discussion] Solaris Sparc build broken

Charles R Harris charlesr.harris@gmail....
Wed Nov 4 13:35:12 CST 2009


On Wed, Nov 4, 2009 at 12:11 PM, David Cournapeau <cournape@gmail.com>wrote:

> On Thu, Nov 5, 2009 at 2:15 AM, Michael Droettboom <mdroe@stsci.edu>
> wrote:
> > I'm getting the following from r7603 on Solaris Sparc -- somehow related
> > to not having a long double version of next after available.  I realise
> > not everyone has access to (or is dependent on) this platform, so I'm
> > willing to help in whatever way I can, I'm just not sure I understand
> > the change yet.
>
> The only way to implement nextafter that I know of requires to know
> the exact representation of the floating point number, and long double
> is unfortunately platform dependent.
>
> What is the long double format on solaris sparc ? (big endian I
> suppose, but how many bits for the mantissa and  exponent ? Does it
> follow IEER754 ?)
>
>
Long double on SPARC is quad precision, which I believe *is* in one of the
ieee specs. In any case, it has a lot more precision than the extended
precision found in Intel derived architectures. Hmm, I wonder what ia64
does?

Chuck
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