[Bug math/16400] New: ldbl-128 / ldbl-128ibm lgamma spurious underflows for small positive argument

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

https://sourceware.org/bugzilla/show_bug.cgi?id=16400

            Bug ID: 16400
           Summary: ldbl-128 / ldbl-128ibm lgamma spurious underflows for
                    small positive argument
           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

The ldbl-128 lgamma (also used for ldbl-128ibm) produces spurious underflows
for small positive arguments.  E.g. for powerpc32:

Failure: lgamma (0x1p-1000): Exception "Underflow" set
Failure: lgamma (0x4p-1024): Exception "Underflow" set
Failure: lgamma (0x4p-1076): Exception "Underflow" set

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