| // RUN: %clang %s -Wl,-as-needed -o %t && %run %t | |
| #include <time.h> | |
| #include <unistd.h> | |
| #include <assert.h> | |
| long cpu_ns() { | |
| clockid_t clk; | |
| struct timespec ts; | |
| int res = clock_getcpuclockid(getpid(), &clk); | |
| assert(!res); | |
| res = clock_gettime(clk, &ts); | |
| assert(!res); | |
| return ts.tv_nsec; | |
| } | |
| int main() { | |
| long cpuns = cpu_ns(); | |
| asm volatile ("" :: "r"(cpuns)); | |
| return 0; | |
| } |