[Bug c/47617] SSE rounding mode works -g, not -O3

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47617

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2011-02-06 02:13:37 UTC ---
I think you need to use -frounding-math.  GCC assumes by default the rounding
mode is round-to-nearest.  See
http://gcc.gnu.org/onlinedocs/gcc-4.5.2/gcc/Optimize-Options.html#index-frounding_002dmath-819
.