Choosing the right -march target architecture

[Jonathan Wakely]

On 2 September 2015 at 12:10, Mason wrote:
> 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?

Yes.

> In which case order matters (-march first, then -mtune) right?

Yes.