result of powx_275 is never more precise than double

1 results were exact to double the precision

20 largest ulp errors (stored in a double)
   0.50130 ulp for powx_275(1.3489462435438824e-112) = 2.2776409815422032e-308)
   0.50124 ulp for powx_275(7.4563340130000402) = 250.86768637299593)
   0.50117 ulp for powx_275(1.3392283695296996e-112) = 2.2328022529930137e-308)
   0.50087 ulp for powx_275(1.3460379655756051e-112) = 2.2641625418793377e-308)
   0.50074 ulp for powx_275(7.7399606419999207) = 277.99153319212007)
   0.50072 ulp for powx_275(1.34220862700393e-112) = 2.2464930080225651e-308)
   0.50071 ulp for powx_275(6.8046527895002411) = 195.08164882764413)
   0.50065 ulp for powx_275(1.3444952436896813e-112) = 2.2570334370966407e-308)
   0.50053 ulp for powx_275(489.59741096000567) = 24949253.716663662)
   0.50048 ulp for powx_275(5.2785701494999593) = 97.033080269281243)
   0.50047 ulp for powx_275(1.3397500135617168e-112) = 2.2351947453790518e-308)
   0.50044 ulp for powx_275(8.1931367425003963) = 325.07835911981442)
   0.50041 ulp for powx_275(0.73964149469997686) = 0.43632338092234235)
   0.50040 ulp for powx_275(0.24993767979999551) = 0.022081942172340926)
   0.50034 ulp for powx_275(8.1931367424963817) = 325.07835911937639)
   0.50031 ulp for powx_275(5.7038207530003078) = 120.07597999346063)
   0.50031 ulp for powx_275(6.0286146599994082) = 139.82930355565338)
   0.50029 ulp for powx_275(6.4588955350000807) = 169.01887866295436)
   0.50027 ulp for powx_275(489.59741096017007) = 24949253.7166867)
   0.50026 ulp for powx_275(0.95215894739998375) = 0.87387838065758161)

<tr><td align=left><a href=powx_275.res>powx_275</a></td><td align=right>1063</td><td align=right>0.50130</td><td>1.3489462435438824e-112</td><td>2.2776409815422032e-308</td></tr>