Changing the Aggressiveness of Optimizations

At each level of optimization, you can control the aggressiveness of the optimizations performed.

Use the +Oconservative option at optimization level 2, 3, or 4 if you are not sure if your code conforms to standards. This option provides more safety.

Use the +Oaggressive option at optimization level 2, 3, or 4 for best performance when you are willing to risk changes to the behavior of your programs. Using the +Oaggressive option can cause your program to have compilation or run-time problems that require troubleshooting.