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[Bug math/18619] New: [ldbl-128] expm1l wrong sign of underflowing zero results


https://sourceware.org/bugzilla/show_bug.cgi?id=18619

            Bug ID: 18619
           Summary: [ldbl-128] expm1l wrong sign of underflowing zero
                    results
           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: ---

Similar to bug 18569 for x86 / x86_64, in the ldbl-128 implementation of
expm1l, when expm1l's result should underflow to 0, it can be a zero of the
wrong sign.

Failure: Test: expm1_upward (-0x4p-16496)
Result:
 is:          0.00000000000000000000e+00   0x0.00000000000000000000p+0
 should be:  -0.00000000000000000000e+00  -0x0.00000000000000000000p+0
 difference:  0.00000000000000000000e+00   0x0.00000000000000000000p+0
 ulp       :  0.0000
 max.ulp   :  3.0000

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