test overflow

overflow.c

#include <stdio.h>

int main(void)
{
  volatile char test, i;

  __asm__ volatile("mov $82, %0 \n"
		   "mov $0, %1 \n"
		   "addb $127, %0 \n"
		   "jno hogehoge \n"
		   "mov $1, %1 \n"
		   "hogehoge: nop":  "=r"(test), "=r"(i));

  printf("%d\n", i);
  
  return 0;
}