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If you are having problems with rdtsc.cpp compiling in the zone source I suggest using this assembly instead

Edit: read below, you need to change the variables high and low if you are using VC.

This goes in rdtsc.cpp below sint64 RDTSC_Timer::rdtsc() for the WIN32 ifdef

__asm
{
push eax
push edx
rdtsc
mov high, eax
mov low, edx
pop edx
pop eax
}