[Bug math/19071] New: ldbl-96 lroundl incorrect just below powers of 2

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

https://sourceware.org/bugzilla/show_bug.cgi?id=19071

            Bug ID: 19071
           Summary: ldbl-96 lroundl incorrect just below powers of 2
           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-96 version of lroundl is incorrect for systems with 64-bit long when
the argument's absolute value is just below a power of 2, 2^32 or more, and
rounds up to the next integer; in such cases, it returns 0.  E.g., on x86_64:

Failure: Test: lround (4294967295.5)
Result:
 is:         0
 should be:  4294967296

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