# 15 Compiler Directives

Compaq Fortran provides the following compiler directives:

- General directives

  Perform general-purpose tasks during compilation (see Section 15.1).

- Parallel directives (TU*X only)

  Specify parallel regions, and characteristics of data and threads for shared access of data in memory (see Section 15.2).

- High Performance Fortran directives (TU*X only)

  Specify data layout and other characteristics when compiling for parallel execution (see Section 15.3).

Compiler directives are preceded by a special prefix that identifies them to the compiler.

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