Yes, these are the droids I am looking for. You could try passing ARCHOPTS=-march=native to make (need to do REGENIE=1 for the change to take effect). Make sure the flag actually does anything by running
$ gcc -march=native -E -v - </dev/null 2>&1 | grep cc1
Don't hold your breath, but if a couple percent speed bump is all you need this might just do the trick.