[Bug math/19077] New: [ldbl-128ibm] logl (1) incorrect sign of zero result

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

https://sourceware.org/bugzilla/show_bug.cgi?id=19077

            Bug ID: 19077
           Summary: [ldbl-128ibm] logl (1) incorrect sign of zero result
           Product: glibc
           Version: 2.22
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: jsm28 at gcc dot gnu.org
  Target Milestone: ---
            Target: powerpc*-*-*

The ldbl-128ibm implementation of logl produces a zero with the wrong sign for
logl (1) in FE_DOWNWARD mode:

Failure: Test: log_downward (0x1p+0)
Result:
 is:         -0.00000000000000000000000000000000e+00 
-0x0.000000000000000000000000000p+0
 should be:   0.00000000000000000000000000000000e+00  
0x0.000000000000000000000000000p+0
 difference:  0.00000000000000000000000000000000e+00  
0x0.000000000000000000000000000p+0
 ulp       :  0.0000
 max.ulp   :  1.0000

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