http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50905
xunxun <xunxun1982 at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |UNCONFIRMED
Resolution|INVALID |
--- Comment #2 from xunxun <xunxun1982 at gmail dot com> 2011-10-28 19:53:47
UTC ---
(In reply to comment #1)
> >Am I right?
> Yes but the reason comes down to fp math is not associative which means it is
> impossible to do reductions with fp math unless you have -ffast-math (or
> really
> -fassociative-math) turned on.
But -ffast-math -ftree-parallelize-loops=2 is also no use.
We must combine -ffast-math and -O2/-O3.
