Directives are used to provide additional information to the compiler, and to control the compilation of specific code blocks, for example, loops.
For general-purpose directives, you do not need to specify a specific compiler option to enable the directive.
Arm Fortran Compiler supports the general-purpose
ivdep directive, and the OpenMP-specific
omp simd directive.
For more information on supported OpenMP directives, see the Standards support topic.