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[Bug manual/15267] Add note on performance characteristics of some libm functions


https://sourceware.org/bugzilla/show_bug.cgi?id=15267

--- Comment #4 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
At least since release 4.04, the Linux man-pages say:

On 64-bits, pow() may be more than 10,000 times slower for some (rare) inputs
than for other nearby inputs.  This affects only pow(), and not powf() nor
powl().

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