Is it possible to update gcc from 4.1 branch for FC6 as well to include the core2 support. I have a couple of core2 extremes and would like to see how much difference these make. Thanks
The intrinsics are already there and so is MNI support, and while core2 support has been added only in rawhide (so you can't use -march=core2), -march=nocona -mmni -mtune=generic is a good enough replacement for -march=core2 and -mtune=core2 is almost identical to -mtune=generic even on GCC trunk. FYI, rawhide gcc groks both the -mmni and -mssse3 switches, FC6 only -mmni and GCC trunk only -mssse3. Whenever FC6 gcc is updated, it will get these changes (they are already on redhat/gcc-4_1-branch; so there is no point in keeping this bug open), but there is no firm plan for it, it might take a month or three.