[Bug math/15307] New: casinh inaccurate for arguments close to i with imaginary part above 1

["jsm28 at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=15307

             Bug #: 15307
           Summary: casinh inaccurate for arguments close to i with
                    imaginary part above 1
           Product: glibc
           Version: 2.17
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
        AssignedTo: unassigned@sourceware.org
        ReportedBy: jsm28@gcc.gnu.org
    Classification: Unclassified


casinh is inaccurate for arguments close to i but with imaginary part above 1. 
For example, on x86_64, casinh (0x1p-52 + 0x1.0000000000001p0i) should give a
result with real part 0x1.8dc42193d5c03p-26 but gives one with real part
0x1.8dc4218000001p-26 instead.  The same issue affects casin and cacos for
corresponding inputs.

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