testing long double (without inline functions)
Failure: Test: log2p1 (-0x7.fff3a57fdd2666b8p-4)
Result:
 is:         -9.99966006948927928016e-01  -0xf.ffdc5b0f5152a160p-4
 should be:  -9.99966006948927927853e-01  -0xf.ffdc5b0f5152a130p-4
 difference:  1.62630325872825665101e-19   0xc.0000000000000000p-66
 ulp       :  3.0000
 max.ulp   :  2.0000
Maximal error of `log2p1'
 is      : 3 ulp
 accepted: 2 ulp

Test suite completed:
  4 max error test cases,
  548 input tests,
  - with 2200 tests for exception flags,
  - with 524 tests for errno executed.
  2 errors occurred.