| Pragma | Description |
|---|---|
| #pragma block_loop | Marks a block with a scope-unique identifier. |
| #pragma STDC cx_limited_range | Instructs the compiler that complex division and absolute value are only invoked with values such that intermediate calculation will not overflow or lose significance. |
| #pragma disjoint | Lists identifiers that are not aliased to each other within the scope of their use. |
| #pragma execution_frequency | Marks program source code that you expect will be either very frequently or very infrequently executed. |
| #pragma expected_value | Specifies the value that a parameter passed in a function call is most likely to take at run time. The compiler can use this information to perform certain optimizations, such as function cloning and inlining. |
| #pragma isolated_call | Specifies functions in the source file that have no side effects other than those implied by their parameters. |
| #pragma leaves | Informs the compiler that a named function never returns to the instruction following a call to that function. |
| #pragma loopid | Marks a block with a scope-unique identifier. |
| #pragma nosimd | When used with -qsimd=noauto, disables the generation of SIMD instructions for the next loop. |
| #pragma novector | When used with -qhot=novector, disables auto-vectorization of the next loop. |
| #pragma option_override | Allows you to specify optimization options at the subprogram level that override optimization options given on the command line. |
| #pragma reachable | Informs the compiler that the point in the program after a named function can be the target of a branch from some unknown location. |
| #pragma reg_killed_by | Specifies registers that may be altered by functions specified by #pragma mc_func. |
| #pragma stream_unroll | When optimization is enabled, breaks a stream contained in a for loop into multiple streams. |
| #pragma unroll | Controls loop unrolling, for improved performance. |
| #pragma unrollandfuse | Instructs the compiler to attempt an unroll and fuse operation on nested for loops. |