[Bug math/22693] New: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception

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

https://sourceware.org/bugzilla/show_bug.cgi?id=22693

            Bug ID: 22693
           Summary: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid"
                    exception
           Product: glibc
           Version: 2.26
            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*-*-*

The ldbl-128ibm implementation of log1pl does ordered comparisons on a negative
qNaN argument, so resulting in spurious "invalid" exceptions (for soft-float
powerpc; hard-float only avoids this because of GCC bug 58684 meaning ordered
comparison instructions never get generated).

Failure: log1p (-qNaN): Exception "Invalid operation" set
Failure: log1p_downward (-qNaN): Exception "Invalid operation" set
Failure: log1p_towardzero (-qNaN): Exception "Invalid operation" set
Failure: log1p_upward (-qNaN): Exception "Invalid operation" set

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