Source code adapted from: https://preshing.com/20120515/memory-reordering-caught-in-the-act/

• Compile using make. You can also compile after defining USE_CPU_FENCE or USE_SINGLE_HW_THREAD in ordering.c. This will prevent run-time reordering.
• Run using ./ordering. This will display the reordering count. You can only exit by killing the process.