Re: [boost] Optimized portable isnan, isfinite, fpclassify etc

From: Johan Råde (rade_at_[hidden])
Date: 2006-10-12 09:40:03

Markus Schöpflin wrote:
> Johan Råde wrote:
> 
>> Markus Schöpflin wrote:
> 
>>> Are you interested in test results from a Tru64/Alpha machine?
> 
>> Yes! I have not run any tests on Alphas.
> 
> Here you are:

[snip]

There are three problems:

1. The linking problem has been fixed in the latest version.
(Or did you  have the latest version and just forgot to compile
long_double_mask.cpp?)

2. A slightly different binary representation of long double than I had 
expected. Is there any preprocessor symbol that I can use to detect 
Alpha processors?

3. Your <limits> header is a bit funny.
numeric_limits<T>::quiet_NaN() returns a NaN with the signbit set.
This triggered the assertion.
(Does it matter? Maybe. According to C99, positive NaN should be
written to text files as "nan" or "+nan"  and negative NaN as "-nan".
And this will probably be part of C++0x as well.)

Thank you,
Johan Råde