On 05/28/2013 05:29 PM, lluvia_lists@xxxxxxxxxxx wrote: > Is there some problem when compiling with the flag -march=native if the > program will run on procesors of unknown families of X86_64? The point is > that, transparently, execution will go from on proccesor to another,. That's what you want -march=generic for. The whole idea of -march=native is to get the best performance for programs run on the same machine as the compiler. Andrew.