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

["siddhesh at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

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

             Bug #: 15267
           Summary: Add note on performance characteristics of some libm
                    functions
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: manual
        AssignedTo: unassigned@sourceware.org
        ReportedBy: siddhesh@redhat.com
                CC: mtk.manpages@gmail.com, roland@gnu.org
    Classification: Unclassified


libm has a fallback to multiprecision calculation for some functions (log, exp,
atan, pow, etc.) which is much slower than the fast path.  While the inputs
that trigger this are unknown, it would be useful to document the fact that
there is such a performance difference, along with an explanation of why the
multiprecision stage is needed at all.

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