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[Bug c/47617] SSE rounding mode works -g, not -O3
- From: "pinskia at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Sun, 6 Feb 2011 02:13:39 +0000
- Subject: [Bug c/47617] SSE rounding mode works -g, not -O3
- Auto-submitted: auto-generated
- References: <bug-47617-4@http.gcc.gnu.org/bugzilla/>
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
.