result of tanh is never more precise than double

55 results were exact to double the precision

20 largest ulp errors (stored in a double)
   0.51683 ulp for tanh(0.19658675319999991) = 0.1940928447126862)
   0.51224 ulp for tanh(0.46952064080734679) = 0.43781192019567161)
   0.50934 ulp for tanh(0.48393381620000103) = 0.4493885354614241)
   0.50669 ulp for tanh(-0.64588807553091254) = -0.56889533888835864)
   0.50632 ulp for tanh(1.0673566277961819) = 0.78846324759893061)
   0.50597 ulp for tanh(0.6917437951999994) = 0.59910107703858029)
   0.50472 ulp for tanh(0.8339188319999955) = 0.68257462531000601)
   0.50393 ulp for tanh(0.69174379519999507) = 0.59910107703857751)
   0.50383 ulp for tanh(-0.75809214000000358) = -0.6399518180782523)
   0.50342 ulp for tanh(-0.83845433300000349) = -0.68498950697732974)
   0.50331 ulp for tanh(0.4695206408073494) = 0.43781192019567372)
   0.50330 ulp for tanh(-0.27338526059999441) = -0.26677200636913645)
   0.50300 ulp for tanh(-0.49153832360000038) = -0.4554365273089494)
   0.50259 ulp for tanh(-0.6723689051999987) = -0.58653598595555889)
   0.50258 ulp for tanh(-0.78929398280000151) = -0.65800889300808008)
   0.50242 ulp for tanh(1.0673566277961901) = 0.78846324759893371)
   0.50241 ulp for tanh(0.83391883199973171) = 0.68257462530986512)
   0.50235 ulp for tanh(-0.41590841680000296) = -0.39347790526248116)
   0.50229 ulp for tanh(0.085702194600000517) = 0.085492985507326799)
   0.50215 ulp for tanh(-0.03726875599999812) = -0.037251510641910783)

<tr><td align=left><a href=tanh.res>tanh</a></td><td align=right>792</td><td align=right>0.51683</td><td>0.19658675319999991</td><td>0.1940928447126862</td></tr>