Re: [boost] Looking for some "real world" extended precision integer arithmetic tests

Subject: Re: [boost] Looking for some "real world" extended precision integer arithmetic tests
From: John Maddock (boost.regex_at_[hidden])
Date: 2012-01-26 05:12:45

> It took me some time to figure out that convert_to<double>() method 
> doesn't
> work properly for negative integers (Please correct me if I'm wrong).
> Here is the code snippet:
>
> #include "boost/multiprecision/fixed_int.hpp"
> using namespace boost::multiprecision;
>
> int main() {
>    mp_int512_t a = 1;
>    double da = a.convert_to<double>();
>    mp_int512_t b = -1;
>    double db = b.convert_to<double>();
>    std::cout << da << std::endl; // Outputs: 1
>    std::cout << db << std::endl; // Outputs: 1.34078e+154
>    return 0;
> }
>
> As soon as this fix is ready, I'll be able to finish benchmark.

Ugh.  Looks like that slipped through the test cases.  That and a couple 
other bugs fixed in SVN.

Cheers, John.