In our previous episode, Martok said: > Tangent: On Windows, RDTSC is wrapped by the QueryPerformanceCounter() call. > QPC > incidentally is complicated enough that it is very likely no out-of-order > instructions are pending by the time it gets to actually executing RDTSC, but > with less jitter than "abusing" CPUID for serialisation (QPC takes a rather > stable 22 cycles). /Tangent
Afaik Query* also works reliable on systems with multiple processors. Might be important now that Ryzen is a multiple die solution. _______________________________________________ fpc-devel maillist - fpc-devel@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-devel
