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Old 03-21-2005, 05:07 AM   #16
cathectic
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Registered: Sep 2004
Location: UK, Europe
Distribution: Slackware64
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Everything that can be except the actual instruction set - it mostly boils down to scheduling, but I did come across one or two other things that escape me now.

From the first source I could get to hand on the matter http://www.redhat.com/docs/manuals/e...(go to:4.17.3)

Quote:
-mtune=cpu-type

Tune to cpu-type everything applicable about the generated code, except for the ABI and the set of available instructions. The choices for cpu-type are i386, i486, i586, i686, pentium, pentium-mmx, pentiumpro, pentium2, pentium3, pentium4, k6, k6-2, k6-3, athlon, athlon-tbird, athlon-4, athlon-xp, athlon-mp, winchip-c6, winchip2, k8, c3 and c3-2.

While picking a specific cpu-type will schedule things appropriately for that particular chip, the compiler will not generate any code that does not run on the i386 without the -march=cpu-type option being used. i586 is equivalent to pentium and i686 is equivalent to pentiumpro. k6 and athlon are the AMD chips as opposed to the Intel ones.
 
  


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