gcc optimization flags for Xeon?

Question

I\'d want your input which gcc compiler flags to use when optimizing for Xeons?

There\'s no \'xeon\' in mtune or march so which is the closest match?

Answer 1

The following will show you all the flags your processor supports:

cat /proc/cpuinfo | grep flags | head -1

Best way to determine what optimizations exist for your proccesor specifically depends not only on the model, but what version of gcc you have on the system you are compiling. Make sure to check what version of gcc you have, and cross reference on their documentation:

https://gcc.gnu.org/onlinedocs

i.e. I have Slackware 14.1 x64, which has gcc 4.8.2, so I would go here:

https://gcc.gnu.org/onlinedocs/gcc-4.8.2/gcc/i386-and-x86-64-Options.html#i386-and-x86-64-Options