-fuselevel, (-fuselevel=0)

4.5.10 -fuselevel, (-fuselevel=0)

The fuselevel option further controls the level of loop fusion. (Whenever you set -fuselevel , KAP automatically sets -fuse .)

The possible settings for this option are the following:

0 - KAP performs standard fusion techniques. This is the default.
1 - This setting instructs the fusion pass to move nonadjacent loops to adjacent positions. This movement is validated using a test based on data dependence. If the movement is successful, KAP attempts to fuse the repositioned loops.
2 - This setting instructs the fusion pass to attempt loop-iteration space reversal and loop peeling to provide additional opportunities to fuse loops together. Both of these transformations are based on data dependence tests. Reversing the iteration space on adjacent loops, so that the index sets are the same, might permit certain loops to fuse together that would not fuse otherwise. Loop peeling is performed so that adjacent loops will have the same iteration space.