which compilers give longest long double

Question

I may be doing something very stupid here, but i've reached the limit of what double can achieve and on my compiler (i'm using newest xcode on a mac) long double seems no better.

I've read elsewhere that the length of long double depends on the compiler, if so what would you guys recommend i work with to give the longest long doubl1

Answer 1

MPFR, based on GMP, is for multiple-precision floating-point computations with correct rounding.