[Bug math/18789] New: [ldbl-128ibm] sinhl inaccurate near 0

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

https://sourceware.org/bugzilla/show_bug.cgi?id=18789

            Bug ID: 18789
           Summary: [ldbl-128ibm] sinhl inaccurate near 0
           Product: glibc
           Version: 2.21
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: jsm28 at gcc dot gnu.org
  Target Milestone: ---

ldbl-128ibm sinhl uses a too-big threshold to decide when to return the
argument, resulting in large errors, e.g.:

Failure: Test: sinh (0x4p-32)
Result:
 is:          9.31322574615478515625e-10   0x1.00000000000000000000p-30
 should be:   9.31322574615478515760e-10   0x1.0000000000000002aaabp-30
 difference:  1.34632261157711695166e-28   0x1.55555555554000000000p-93
 ulp       :  5864062014805.0000
 max.ulp   :  2.0000

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