.arch CPU_TYPE for 2.4GHz Celeron ?

[NetSec Fw <netsecfw@xxxxxxxxx>]

Hi,
                                                                                
I would like to specify CPU_TYPE for 2.4GHz Celeron processor,
in the assembly code.
                                                                                
Which "one" of the following choices should be used ?
  . pentium
  . i586
  . i686
  . pentium4
                                                                                
What is the difference between 'i586' and 'i686' types?
                                                                                
Thanks in advance.
                                                                                
thanks
Dev.

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