what cflag/march to use for intel core duo l2400?

[George Nychis]

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