/*

do it like this:

gcc hello.c -o hello && ./hello

*/


#include <sys/types.h>
#include <string.h>

#if defined(__x86_64__)
static inline u_int64_t rdtsc (void)
{
  u_int64_t a = 0, d = 0;
  __asm__ __volatile__ ("rdtsc\n" : "=a" (a), "=d" (d));
  return (a | d << 32);
}
#else
#error bye
#endif

static inline void print(char byte) {
  char *tmp = &byte;
 __asm__ __volatile__ ("movq $1, %%rax\n\t"
                       "movq $1, %%rdi\n\t"
                       "movq %0, %%rsi\n\t"
                       "movq $1, %%rdx\n\t"
                       "syscall\n\t" :: "m" (tmp));
}

static char *hi = "what's good\n";

int main(void) {
  unsigned int i = 0;
  unsigned int l = strlen(hi);
  while (i<l+1) {
    char chomp = (char)rdtsc();
    if (chomp == hi[i]) {
      print(chomp);
      ++i;
    }
  }
  return 0;
}