[Bug math/16390] New: Soft-float ldbl-128ibm atan2l incorrect signs of zero

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

https://sourceware.org/bugzilla/show_bug.cgi?id=16390

            Bug ID: 16390
           Summary: Soft-float ldbl-128ibm atan2l incorrect signs of zero
           Product: glibc
           Version: 2.19
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: jsm28 at gcc dot gnu.org

On powerpc-nofpu, testing atan2l gives errors such as:

Failure: Test: atan2 (-0x4p-1024, 0xf.ffffffffffff8p+1020)
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   :  0.0000

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