[Numpy-discussion] Solaris Sparc build broken

Charles R Harris charlesr.harris@gmail....
Wed Nov 4 13:38:59 CST 2009


On Wed, Nov 4, 2009 at 12:35 PM, Charles R Harris <charlesr.harris@gmail.com
> wrote:

>
>
> 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?
>
>
HP9000 also has quad precision:
http://docs.hp.com/en/B3906-90006/ch02s02.html

Chuck
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