[Bug math/19351] New: [ldbl-128ibm] logl inaccurate near 1

[jsm28 at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=19351

            Bug ID: 19351
           Summary: [ldbl-128ibm] logl inaccurate near 1
           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-128ibm implementation of logl is inaccurate for arguments near 1. 
E.g.:

Failure: Test: log (0xf.ffffffffffff8p-4)
Result:
 is:         -1.11022302462515654042363166809082e-16 
-0x1.000000000000000000000000000p-53
 should be:  -1.11022302462515660205338988848237e-16 
-0x1.000000000000040000000000000p-53
 difference:  6.16297582203915472977912941627177e-33  
0x1.000000000000000000000000000p-107
 ulp       :  2251799813685248.0000
 max.ulp   :  1.0000

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