Hi,

as suggested in math #303 I repost this here:

How feasible it is to integrate quad-double precision, It has 212 bits in significand and is faster than MPFR:

• source code, it is on BSD license.
• article/documentation
• quad double precision homepage

I have just recently integrated boost multiprecision with a fairly large numerical computation software YADE.

Float128 isn't enough for my needs, yade would greatly benefit from quad-double (as it is much faster than MPFR). Also yade can serve as a really large testing ground. I have implemented CGAL numerical traits and EIGEN numerical traits to use multiprecision. And all of them are tested daily in our pipeline, see an example run here. Or a more specific example for float128: test (need to scroll up) and check