+#if defined (__APPLE__) || (__MACH__) || (linux) || (__linux)
+typedef uint64_t TICKS;
+__inline__ uint64_t GetClockTicks()
+{
+ uint32_t lo, hi;
+ /* We cannot use "=A", since this would use %rax on x86_64 */
+ __asm__ __volatile__ ("rdtsc" : "=a" (lo), "=d" (hi));
+ return (uint64_t)hi << 32 | lo;
+}