http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53967
--- Comment #10 from bfriesen at simple dot dallas.tx.us 2012-07-16 15:35:03 UTC --- This particular application test was done with these options (i.e. -O2): -m64 -mtune=generic -march=x86-64 -mfpmath=387 -O2 I have also tried -O3, with no positive benefit. The Autoconf default is -O2 so that is what I generally test/tune the software with. It is pretty rare to see additional benefit from -O3, although with some versions of GCC I have seen application crashes due to wrong code from the tree vectorizer. Bob
