[Bug math/19049] New: [powerpc] erfc incorrect zero sign

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

https://sourceware.org/bugzilla/show_bug.cgi?id=19049

            Bug ID: 19049
           Summary: [powerpc] erfc incorrect zero sign
           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: ---
              Host: powerpc*-*-*

On older powerpc processors, erfc can return a zero with the wrong sign in
FE_DOWNWARD mode, for all of float, double, long double (this is the erfc
version of bug 887):

Failure: Test: erfc_downward (inf)
Result:
 is:         -0.00000000e+00  -0x0.000000p+0
 should be:   0.00000000e+00   0x0.000000p+0
 difference:  0.00000000e+00   0x0.000000p+0
 ulp       :  0.0000
 max.ulp   :  4.0000

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