Interesting. Were you writing a kernel driver? I've only ever used 'volatile' in embedded code where an ISR is touching a variable outside the scope to prevent the compiler from optimizing the code away. What were using 'volatile' for?
No it was some random debugging of Leet Code style excercise, some useless math computation. I just was throwing every possible change, till one worked. I knew that code had to be fast than it was, because with PGO it was very fast.
