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)
   1.52273 ulp for tanh(-0.481720016489098624) = -0.447620056232185426)
   1.51224 ulp for tanh(0.46952064080734679) = 0.437811920195671556)
   1.51146 ulp for tanh(0.962390531000002603) = 0.745341272528029841)
   1.50300 ulp for tanh(-0.491538323600000382) = -0.455436527308949457)
   1.50195 ulp for tanh(-0.500819921400009083) = -0.462761738210254181)
   1.50043 ulp for tanh(-0.477825138199997501) = -0.444500146671642005)
   1.50013 ulp for tanh(-0.479878203800091552) = -0.446146062434039203)
   1.50005 ulp for tanh(-0.481720016489193659) = -0.447620056232261421)
   1.50004 ulp for tanh(-0.481720016490231495) = -0.447620056233091312)
   1.50001 ulp for tanh(0.483933816199881739) = 0.449388535461328842)
   1.50001 ulp for tanh(-0.250596107799869516) = -0.245478930722700966)
   1.50000 ulp for tanh(-0.500819921402840262) = -0.462761738212478901)
   1.50000 ulp for tanh(0.469520640807070511) = 0.437811920195448234)
   1.50000 ulp for tanh(-0.479878203801267333) = -0.44614606243498095)
   1.50000 ulp for tanh(0.196586753201773323) = 0.194092844714392782)
   1.50000 ulp for tanh(0.435898091402360521) = 0.410238617555633123)
   1.49997 ulp for tanh(-0.50081992140000986) = -0.462761738210254625)
   1.49972 ulp for tanh(0.469520640807362721) = 0.437811920195684601)
   1.49946 ulp for tanh(0.952019874800003718) = 0.740696125467827482)
   1.49942 ulp for tanh(-0.481720016489071479) = -0.447620056232163888)

<tr><td align=left><a href=tanh.res>tanh</a></td><td align=right>792</td><td align=right>1.52273</td><td>-0.481720016489098624</td><td>-0.447620056232185426</td></tr>