http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49024
--- Comment #2 from Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> 2011-05-23 19:53:31 UTC --- The 128-bit code for scaled erfc in Cephes is terrible. For ERFC_SCALED(1), it gives: 0.427592... instead of: 0.427583... I don't see any easy way about this, someone will have to play minimax :)