[Bug math/19016] New: clog10 inaccuracy

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

https://sourceware.org/bugzilla/show_bug.cgi?id=19016

            Bug ID: 19016
           Summary: clog10 inaccuracy
           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: ---

For some inputs, clog10 functions can produce errors slightly larger than
accepted in glibc (at least in non-default rounding modes).  E.g., for long
double on x86_64:

Failure: Test: Real part of: clog10_upward (-0xb.e1d3ep-4 -
0x7.54785e1b143f8p-4 i)
Result:
 is:         -5.91989445352436023014e-02  -0xf.27a97abc911bf7200000p-8
 should be:  -5.91989445352436023386e-02  -0xf.27a97abc911bf7d00000p-8
 difference:  3.72694496791892149191e-20   0xb.00000000000000000000p-68
 ulp       :  11.0000
 max.ulp   :  6.0000

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