On Tue, 5 Dec 2006, Richard Guenther wrote: > is whether a correctly rounded "exact" cbrt differs from the pow > replacement by more than 1ulp - it looks like this is not the case.
They fairly obviously differ for negative arguments, which are valid for cbrt but not for pow (raising to a fraction with even denominator). (The optimization from pow to cbrt is valid if you don't care about no longer getting a NaN from a negative argument. Converting the other way (cbrt to pow) is only OK if you don't care about negative arguments to cbrt at all.) -- Joseph S. Myers [EMAIL PROTECTED]
