S12Z Compiler > Optimization

Use this panel to control compiler optimizations. The compiler's optimizer can apply any of its optimizations in either global or non-global optimization mode. You can apply global optimization at the end of the development cycle, after compiling and optimizing all source files individually or in groups.

The following table lists and describes the Optimization options for S12Z compiler.

Table 1. Tool Settings - S12Z Compiler > Optimization Options
Option	Description
Optimization Level	Specify the optimizations that you want the compiler to apply to the generated object code. The options available are as follows: Off (default) - Disables optimizations. This setting is equivalent to specifying the `-O0` command-line option. The compiler generates unoptimized, linear assembly-language code. 1 - The compiler performs all target-independent (that is, non-parallelized) optimizations, such as function inlining. This setting is equivalent to specifying the `-O1` command-line option. The compiler omits all target-specific optimizations and generates linear assembly-language code. 2 - The compiler performs all optimizations (both target-independent and target-specific). This setting is equivalent to specifying the `-O2` command-line option. The compiler outputs optimized, non-linear, parallelized assembly-language code. 3 - The compiler performs all the level 2 optimizations, then the low-level optimizer performs global-algorithm register allocation. This setting is equivalent to specifying the `-O3` command-line option. At this optimization level, the compiler generates code that is usually faster than the code generated from level 2 optimizations. By default, the optimization is disabled for S12Z Compiler.
Speed Vs Size	Use to specify an Optimization Level greater than 0. Speed - The compiler optimizes object code at the specified Optimization Level such that the resulting binary file has a faster execution speed, as opposed to a smaller executable code size. Size(default) - The compiler optimizes object code at the specified Optimization Level such that the resulting binary file has a smaller executable code size, as opposed to a faster execution speed. This setting is equivalent to specifying the `-Os` command-line option.
Inline Level	Enables inline expansion. If there is a #pragma INLINE before a function definition, all calls of this function are replaced by the code of this function, if possible. The options available are: Off Smart (default) 1 2 3 4 5 6 7 8
Auto Inline	Check to enable the auto inlining.
Bottom-Up Inlining	Check to control the bottom-up function inlining method. When active, the compiler inlines function code starting with the last function in the chain of functions calls, to the first one.
Array index expressions do not overflow the index type (this will enable array accesses optimizations)	Check to enable the array accesses optimizations.