result of j1 is never more precise than double

1 results were exact to double the precision

20 largest ulp errors (stored in a double)
   1276498969817541.50000 ulp for j1(29.046828534916855) = -4.9308544767599701e-17)
   1276498969817541.50000 ulp for j1(-29.046828534916855) = 4.9308544767599701e-17)
   937918057966874.12000 ulp for j1(-22.760084380592772) = 7.0790211477589501e-17)
   937918057966874.12000 ulp for j1(22.760084380592772) = -7.0790211477589501e-17)
   523092309117987.81000 ulp for j1(60.469457845347492) = -2.6075935887631564e-17)
   422992643178276.69000 ulp for j1(38.474766234771614) = -9.7736421293644016e-17)
   390374805725733.69000 ulp for j1(41.61709421281445) = 7.5308076821311013e-17)
   244279428281981.75000 ulp for j1(25.903672087618382) = -7.3698549660584186e-17)
   244279428281981.75000 ulp for j1(-25.903672087618382) = 7.3698549660584186e-17)
   113531257386682.34000 ulp for j1(22.760084380592769) = 5.2280311919105032e-16)
   113531257386682.34000 ulp for j1(-22.760084380592769) = -5.2280311919105032e-16)
   81201963312064.98400 ulp for j1(29.046828534916852) = 4.7639245074946587e-16)
   81201963312064.98400 ulp for j1(-29.046828534916852) = -4.7639245074946587e-16)
   78804159372664.96900 ulp for j1(63.611356698481231) = -1.7475614613417457e-16)
   69196824179454.82000 ulp for j1(35.332307550083868) = -4.3427332352398035e-16)
   68619564390854.68700 ulp for j1(44.759318997652819) = -2.8094955732782794e-16)
   66375717593882.43700 ulp for j1(32.189679910974405) = 2.1931668859719546e-16)
   51701009284245.95300 ulp for j1(38.474766234771621) = 8.1625531756198566e-16)
   50008543473976.48400 ulp for j1(41.617094212814457) = -8.0328615276065077e-16)
   45289337584552.50000 ulp for j1(47.901460887185451) = -3.9736883684577191e-16)

<tr><td align=left><a href=j1.res>j1</a></td><td align=right>1024</td><td align=right>1276498969817541.50000</td><td>29.046828534916855</td><td>-4.9308544767599701e-17</td></tr>