Function rdtsc

runtime/Perf.cc:96–103

* Return the current value of the fine-grain CPU cycle counter * (accessed via the RDTSC instruction). */

 * (accessed via the RDTSC instruction).
 */
static __inline __attribute__((always_inline))
uint64_t
rdtsc()
{
    uint32_t lo, hi;
    __asm__ __volatile__("rdtsc" : "=a" (lo), "=d" (hi));
    return (((uint64_t)hi << 32) | lo);
}

/**
 * Return the current value of the fine-grain CPU cycle counter