Tuning explained

Where optimization applies increasingly aggressive transformations designed to improve the performance of any application in any supported environment, tuning offers you opportunities to adjust particular characteristics of your application to improve performance, or to target specific execution environments. With proper tuning the compiler can select more efficient machine instructions and generate instruction sequences that are more relevant to your applications than would otherwise be possible with optimization alone. Even at low optimization levels, tuning for your application and target architecture can have a positive impact on performance.

The following section provides further detail on tuning: