By default, programs are not optimized during compilation. You can specify optimization at level 1, 2, or 3, using the following syntax:
-opt level
For example, "-opt 2". If you specify -opt with no level, level 3 optimizations are performed by default. (Remember that if you use the -deb option, only level 1 or 2 is allowed. If you use -deb and specify -opt with no level, level 2 optimizations are performed.) A brief description of the optimizations performed at each level follows.