------- Additional Comments From pcarlini at suse dot de 2005-03-07 09:53 ------- >This is the problem. From the HP-UX 10 manpage > > If both x and y are zero, atan2() returns NaN. > >The behavior changed in HP-UX 11 > > If both x and y are zero, atan2() returns zero.
I see. We are assuming the latter behavior, as per IEC 60559, F.9.1.4 of the C99 Standard. Most current C libraries implement it, indeed. I'm afraid we can't do much... -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20352
