[Bug math/19156] New: [ldbl-128] j0l spurious underflows

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

https://sourceware.org/bugzilla/show_bug.cgi?id=19156

            Bug ID: 19156
           Summary: [ldbl-128] j0l spurious underflows
           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: ---

The ldbl-128 implementation of j0l produces spurious underflow exceptions for
arguments close to 0 (when the result is very close to 1).  E.g., on mips64:

Failure: j0 (-0x2p-16384): Exception "Underflow" set
Failure: j0 (-0x4p-16384): Exception "Underflow" set
Failure: j0 (-0x4p-16448): Exception "Underflow" set
Failure: j0 (-0x4p-16496): Exception "Underflow" set
Failure: j0 (-0x8p-16448): Exception "Underflow" set
Failure: j0 (0x1p-10000): Exception "Underflow" set
Failure: j0 (0x2p-16384): Exception "Underflow" set
Failure: j0 (0x4p-16384): Exception "Underflow" set
Failure: j0 (0x4p-16448): Exception "Underflow" set
Failure: j0 (0x4p-16496): Exception "Underflow" set
Failure: j0 (0x8p-16448): Exception "Underflow" set

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