[Bug 235413] [LIBM] optizimation for cexp and cexpf

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235413

            Bug ID: 235413
           Summary: [LIBM] optizimation for cexp and cexpf
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: kargl at FreeBSD.org

Created attachment 201620
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=201620&action=edit
patch

The attach patch utilizes sincos[f] in the computation
of cexp[f].  For 20 million random z=x+Iy drawn in the
box defined by x,y in [0,MAX_EXP*LN2], this amounts to
a 8.7% and 11.4% speed improvement over computing sin[f]
and cos[f] individually in cexp[f].

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