TR1 Math Special Functions

[Paolo Carlini]

Gabriel Dos Reis wrote:

>Can we require C99?
>
So far, we arranged things in a way that if C99 math functions are not 
available most of the TR1 facilities work anyway, maybe with a lower QoI 
(like in random). Some, like the classification macros, will be simply 
unavailable both in namespace std:: and in namespace std::tr1.

>  Or is there a __builtin_isnan to use?
>  
>
Maybe that will just work! ;) I just tried and in mainline apparently we 
are able to fully expand it without library calls. I would ask Ed to try 
simply use the builtin and regtest on as many targets he can. It would 
be nice if a compiler guy could confirm that such library calls are 
never issued for __builtin_isnan irrespective of the target. I'm CC-ing 
Ian... Apparently the documentation is a little weak about such builtins..

Paolo.