[Bug math/18602] New: jn tests inaccuracy in non-default rounding modes

[jsm28 at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=18602

            Bug ID: 18602
           Summary: jn tests inaccuracy in non-default rounding modes
           Product: glibc
           Version: 2.21
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: jsm28 at gcc dot gnu.org
  Target Milestone: ---

Some existing jn tests, if run in non-default rounding modes, produce errors
above those accepted in glibc.  For example, for double on x86_64:

Failure: Test: jn_towardzero (10, 0xap+0)
Result:
 is:          2.07486106633358258211e-01   0x1.a8ee79d2eac9a0000000p-3
 should be:   2.07486106633358841078e-01   0x1.a8ee79d2eacaf0000000p-3
 difference:  5.82867087928207183722e-16   0x1.50000000000000000000p-51
 ulp       :  21.0000
 max.ulp   :  0.0000

This bug report is specifically *only* about those cases, already in the
testsuite.  It is not about the more general inaccuracy of all the Bessel
function implementations, including in round-to-nearest mode.

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