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NOOPT Keyword Print E-mail
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Written by Chamara Withanachchi   
NOOPT Keyword

The NOOPT keyword indicates that no optimization is to be performed on the standalone field, parameter or data structure for which this keyword is specified. Specifying NOOPT ensures that the content of the data item is the latest assigned value. This may be necessary for those fields whose values are used in exception handling.

Note: The optimizer may keep some values in registers and restore them only to storage at predefined points during normal program execution. Exception handling may break this normal execution sequence, and consequently program variables contained in registers may not be returned to their assigned storage locations. As a result, when those variables are used in exception handling, they may not contain the latest assigned value. The NOOPT keyword will ensure their currency.

If a data item which is to be passed by reference is defined with the NOOPT keyword, then any prototype or procedure interface parameter definition must also have the NOOPT keyword specified. This requirement does not apply to parameters passed by value.

TIP: Any data item defined in an OPM RPG/400 program is implicitly defined with NOOPT. So if you are creating a prototype for an OPM program, you should specify NOOPT for all parameters defined within the prototype. This will avoid errors for any users of the prototype.

All keywords allowed for standalone field definitions, parameters, or data structure definitions are allowed with NOOPT.

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