[Bug math/15327] New: cacosh inaccuracy and spurious exceptions

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

http://sourceware.org/bugzilla/show_bug.cgi?id=15327

             Bug #: 15327
           Summary: cacosh inaccuracy and spurious exceptions
           Product: glibc
           Version: 2.17
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
        AssignedTo: unassigned@sourceware.org
        ReportedBy: jsm28@gcc.gnu.org
    Classification: Unclassified


cacosh is inaccurate and raises spurious exceptions for various inputs.  For
example, for "float" on x86_64:

cacosh (0x1.fp127 + 0x1.fp127 i) produces spurious OVERFLOW/INVALID exceptions
and an incorrectly infinite result.

cacosh (0x1.fp-129 - 1.5 i) produces spurious UNDERFLOW exceptions.

cacosh (1.0 + 0x1.fp-30 i) has an error of 11040 ulp in the real part of the
result.

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