NOC - General Information

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# NOC - General Information

This section describes various aspects which should be taken into consideration when the Natural Optimizer Compiler is installed at your site. The information provided in this documentation helps you to make full use of the benefits offered by the Natural Optimizer Compiler.

This document covers the following topics:

- Natural Nucleus Optimization

- Natural Optimizer Compiler

## Natural Nucleus Optimization

The Natural nucleus optimizes simple arithmetic, assignment, and comparison statements by translating parts of them into machine code. All programs are optimized automatically in this way.

The following graphic illustrates how the Natural Optimizer Compiler generates machine code when a Natural object is compiled or executed:

## Natural Optimizer Compiler

The Natural Optimizer Compiler goes one step further than standard optimization. It compiles not only simple statements to machine code, but also complex statements and statement sequences.

The compiled code is further optimized as far as array range operations, field concatenation, and optimum base register assignment are concerned.

All statements (including arithmetic operations) optimized with the Natural Optimizer Compiler provide the same results as the same statements generated by standard Natural.

To activate the Natural Optimizer Compiler (see the relevant section), use the macro `NTOPT` in the Natural parameter module, the dynamic profile parameter `OPT`, the system command `NOCOPT`, or the `OPTIONS` statement.

All programs that are cataloged (`STOW` or `CATALOG` system command) with the Natural Optimizer Compiler activated are compiled to machine code. This will also result in the object code size of the programs being larger than usual, depending on how much of the program can be optimized.

A program executed with the `RUN` system command is compiled to machine code if the Natural Optimizer Compiler is activated with the system command `NOCOPT`, the macro `NTOPT` or the `OPTIONS` statement for all or part of the program.

To see if a program is suitable for compilation with the Natural Optimizer Compiler, use the `NOCSTAT` command as described in the relevant section.

Note
The dynamic recatalog feature (profile parameter `RECAT` set to `ON`) cannot be used with programs compiled to machine code.

To execute programs that have been compiled with the Natural Optimizer Compiler, it is not necessary that the Natural Optimizer Compiler is installed.

### On this page

- Natural Nucleus Optimization
- Natural Optimizer Compiler