It should be faster to replace the HP numbers entirely with 64-bit floats. Regardless, I think it would be a useful for two purposes: 1) it would serve as an im

It should be faster to replace the HP numbers entirely with 64-bit floats. Regardless, I think it would be a useful for two purposes: 1) it would serve as an implementation for chips with only 32-bit floats (maybe some kinds of embedded systems) and 2) we can exhaustively test and verify that the algorithm works on all 32-bit numbers, providing more confidence in the 64-bit version.