Why are there only i686 and i586 Version of glibc and kernel?

[Ismael Juma]

Jakub Jelinek wrote:
> On Mon, May 31, 2004 at 09:22:04AM +0200, dragoran wrote:
> 
>>Why not add a glibc and kernel which are optimized for pentium 4 in FC3 
>>? This would increase the perfomance on newer PC but also works on older 
>>ones by still including the i686 and i586 versions.
> 
> 
> Starting with FC3, .i386.rpm and .i686.rpm packages will be compiled
> with -march{3,6}86 -mtune=pentium4, so although they will run on
> i386 (resp. i686), they will be optimized for P4 (Athlons and newer AMD
> chips run P4 optimized code without noticeable performance hit).
> 
> 	Jakub
> 
> 

Out of curiosity, how do those optimisations affect Pentium M processors?

Regards,
Ismael