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...bit mantisa, the dll-provided pow function no longer >returned integral values when both operands were integral. Now, I don't >think that is a requiremnet of the standard but every other pow >implementation I looked at did that. So I changed to a well-tested >pow function (from the Cepehes math library) that did. As you found out >it is expensive. >I have written another pow function that use exp2 and log2 library functions >rather than the polynomial expansion used by Cephes package. It seems to be >accurarte enough (except when the result of pow is near 1.0 (eg, po...