result of Gamma is never more precise than double

20 largest ulp errors (stored in a double)
   509.53716 ulp for Gamma(171.624376956302683) = 1.79769313486206882e+308)
   444.50086 ulp for Gamma(164.040279658439005) = 2.46119858511138761e+291)
   435.49931 ulp for Gamma(135.625077550027441) = 4.27308755726023973e+229)
   427.49852 ulp for Gamma(164.040279658439317) = 2.46119858511530492e+291)
   424.49947 ulp for Gamma(134.063437915655896) = 2.02876962764720809e+226)
   421.57132 ulp for Gamma(135.625077549163308) = 4.273087539143531e+229)
   421.46596 ulp for Gamma(134.063437915652969) = 2.02876962761791623e+226)
   409.50004 ulp for Gamma(135.625077550049639) = 4.27308755772514404e+229)
   369.48678 ulp for Gamma(171.62437695630237) = 1.79769313485900321e+308)
   345.30207 ulp for Gamma(134.063437917116232) = 2.02876964214828288e+226)
   340.48003 ulp for Gamma(134.063437915653338) = 2.02876962762160648e+226)
   284.50051 ulp for Gamma(149.995246887066457) = 3.71933987033443638e+260)
   269.50029 ulp for Gamma(135.625077550018432) = 4.27308755707126562e+229)
   267.50002 ulp for Gamma(164.040279658475555) = 2.46119858556970973e+291)
   245.00000 ulp for Gamma(2.22507385850720188e-308) = 4.49423283715566653e+307)
   245.00000 ulp for Gamma(-2.22507385850720188e-308) = -4.49423283715566653e+307)
   231.49988 ulp for Gamma(134.063437915611445) = 2.0287696272057546e+226)
   222.01047 ulp for Gamma(171.624376956302655) = 1.79769313486166007e+308)
   217.08479 ulp for Gamma(171.624376956302712) = 1.7976931348622732e+308)
   211.51340 ulp for Gamma(121.763991321951437) = 2.60795713456586951e+200)

<tr><td align=left><a href=Gamma.res>Gamma</a></td><td align=right>1575</td><td align=right>509.53716</td><td>171.624376956302683</td><td>1.79769313486206882e+308</td></tr>