[Bug 214815] pow(3): underflow result can be -0.0

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https://bugzilla.kernel.org/show_bug.cgi?id=214815

--- Comment #2 from M Welinder (mwelinder@xxxxxxxxx) ---
Hmm...   In that case maybe we need glibc's opinion.

fwiw, I couldn't find anything relevant in the C standard either.

A quick test says Solaris also produces -0.0 in this case.  And -0.0 is a very
reasonable result for underflow from the negative side.

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