Tim Prince wrote:
George Nychis wrote:
Hi,
I was wondering what march to specify in my cflags for the Intel Core
Duo L2400 processor. The gentoo-wiki says that the safe cflag is
prescott, but I figured I would ask here to find the optimal for this
processor, or if the prescott is truly the safest/optimal.
The wiki might be right, if you are using the same gcc version they have
in mind. How are we to know? Might there a conflict between safety and
optimality?
Do you disqualify gcc-4.2 on grounds of safety? Surely, it would often
generate better code, and avoid the question of what -march option to
choose.
I'd prefer sticking to gcc-4.1
Check out this response i got on the lkml about the architecture:
>> My guess is the "Pentium-4/Celeron(P4-based)/Pentium-4 M/Xeon" >family,
>> but maybe someone has a different opinion or can support it.
>>
>> Here is the /proc/cpuinfo:
>> processor : 0
>> vendor_id : GenuineIntel
>> cpu family : 6
>> model : 14
>
>[snip]
>
>"Pentium-4/Celeron(P4-based)/Pentium-4 M/Xeon" are all family 15, not
>family 6.
>
>I have a Pentium M, it's family 6 model 13. Also, AFAIK the Intel Core
>is based on the Pentium M (which in turn is based on Pentium III). So,
>my personal best guess would be to choose "Pentium M".
>
>Unfortunately, I don't have one of these (Intel Core) at this point,
>so I can't test it myself...
So, this person has a pentium m, and /proc/cpu info says his processor
belongs to family 6... as you can see, mine also belongs to family 6...
so even though the wiki stages march=prescott, what do you guys think?
- George
