You can also use multiple layered Kahan, just like the double double and quad double tricks. Adding just one more layer and letting hardware cover more bits pre

You can also use multiple layered Kahan, just like the double double and quad double tricks. Adding just one more layer and letting hardware cover more bits precision is often much faster to get precision than any larger lib. If you're overflowing the exponent, then you need more than hardware magics. But for precision I've used these multi-double tricks with the same guarantees as IEEE style formats, but with as much precision as I want.