Hello Marcel!

Thus quoth Marcel Vandevusse to All :
 MV> I am trying to time a piece of assembly code; supposed the Intel
 MV> Pentium has a register which counts clock ticks. I figured this would
 MV> be the easiest accessable counter with a high enough resolution for my
 MV> purpose, but: I don't know how to access this register.

You need ring 0 privileges to access the Pentium performance counter
registers but your code runs (usually) at ring 3. I don't know for sure if
there is a mapping of the counter you need to a MSR (which could be read at
ring 3).

 MV> And do any other CPUs (80486, PPRO, Cyrix, AMD, etc) have a register
 MV> like this?

PPRO does.

bye, Detlef

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