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

From: Johan Råde (rade_at_[hidden])
Date: 2006-10-09 03:56:28

Dear John,

Thanks for your thoughtful comments.
I'm glad you find the project worth persuing.

I would be very happy to work with you to merge and improve our 
solutions to a Boost grade library.

Right now I'm very busy but later this week I will have time to study 
your comments more carefully.

Thank you,
Johan Råde

John Maddock wrote:
> Johan Råde wrote:
>> Many of these functions have also been
>> implemented by John Maddock.
>> The difference is that my implementation
>> is optimized for speed.

[snip]

> I think this is a good idea and worth persuing.  Unfortunately I 
> don't think your code is as portable as you think it is: I'm attaching below 
> some failed test runs of your code with Intel (Win32 and Linux), HP aCC and 
> g++ (HP-UX).  The difficulty is that once you crank up the optimisation 
> levels, code like this tends to break, and since it's reason-for-existance 
> is to improve performance, that's a problem :-(
> 

[snip]

> OK where does this leave us.
> 
> Looks like the way forward might be some kind of merger of our 
> implementations: 
> 
> Thanks,
> 
> John.