Is Multiplying the Inverse Better or Worse?

Question

When dealing with double data types is multiplying by the inverse better or worse?

Which way is faster? Which way uses

Answer 1

If you're dividing by a literal value like 645.16 then it's very likely that there is no difference because the compiler can easily determine which version is faster and use that.
If you're dividing or multiplying by a variable then it's likely that multiplication is slightly faster because the logic is generally more simple.
As with anything, to be sure, use a profiler.