On 02/09/2015 12:13, Jonathan Wakely wrote: > On 2 September 2015 at 08:43, Mason wrote: >> Is there a way to say: >> "Use any instruction available for this uarch, but optimize code >> for this other uarch / class of uarches (mtune=generic)" ?? > > Yes, just use both -march and -mtune. e.g. > > -march=pentium3 -mtune-generic The doc states: "Specifying -march=cpu-type implies -mtune=cpu-type." Are you suggesting that -mtune can later be overridden? In which case order matters (-march first, then -mtune) right? Regards.