> The question I have is how much does RDTSC slow this down? I may do I don't know. If I understand correctly, rdtsc can be executed in parallen with *some* other instructions (and places no "barrier" in the code), in which case it could be executed at no additional cost (except the instruction fetching, of course) I have not yet been able to instruct GCC to use the mmx or sse3 instructions/ registers to do the shifting. Code could be reshuffeled to allow the compiler more freedom.
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