Thanks for reply. I will try -march=i686. Ken 2010/8/12 Ian Lance Taylor <iant@xxxxxxxxxx>: > On Thu, Aug 5, 2010 at 8:48 AM, bokkuri matsu <matsubokkuri33@xxxxxxxxx> wrote: > >> I am using gcc4.1 on intel atom D510 processor. >> Which architecture type should be specified with march option ? >> With some reasons, i cannot update gcc version to 4.2 which supports march=native. > > Support for -march=atom was not added until gcc 4.5. > > I don't know that any -march option is better than any other for use > with Atom in gcc 4.1. Scheduling for the Atom is somewhat different > than for other x86 chips. I would just go with -march=i686. > > Ian >
