The following are comment form directives useful for optimizing programs. See Optimizing XL compiler programs and the compiler options that affect performance.
Assertive directives gather information about source code that is otherwise unavailable to the compiler. Providing this information can increase performance.
ASSERT | CNCALL |
INDEPENDENT | PERMUTATION |
The following directives provide different methods for loop optimization:
BLOCK_LOOP | LOOPID |
STREAM_UNROLL | UNROLL |
UNROLL_AND_FUSE | PREFETCH directives |