http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50216
Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution| |INVALID --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2011-08-27 20:59:00 UTC --- The cast works as 0.4l is of type long double so you are calulating it in long double really. du * 0.4l / (log(zu / z0) - puz) is really: ((long double)du)* 0.4l / (long double)(log(zu / z0) - puz)