Small challenge

[EdS2]

There must be several ways to compute x^10:
raise to power ten
raise to power 5 then square
square then raise to power 5
and in each case, do this using repeated multiplication, or by the power operator.

How differently accurate are each of those 6 ways on the machines considered?

Hang on, it's more than 6 - the squares and fifth powers can also be done in at least two ways, perhaps even three ways if x^2 is available.

(And there's also the less-accurate option of using log and exp and multiplication.)