[Bug tree-optimization/37449] [4.4 Regression] calculix gets wrong answer for -O1 -ffast-math

[jakub at gcc dot gnu dot org]

------- Comment #29 from jakub at gcc dot gnu dot org  2008-10-20 23:14 -------
Closing as INVALID, as using -ffast-math is wrong for calculix, at least for
the distilled testcase from it.  In the testcase +0 vs. -0 makes very big
difference
(atan2 acts very similarly to copysign) and so compiling with an option that
says to the compiler that +0 vs. -0 is insignificant may result in very
unexpected results.  Most probably compiling calculix with -O -ffast-math
-fsigned-zeros could work.


-- 

jakub at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37449