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IAR Embedded Workbench for Arm 9.70.x

Optimizations

In this section:

The Optimizations options determine the type and level of optimization for the generation of object code.

OptimizationTab_Too64_05_ARM.png
Level

Selects the optimization level. Choose between:

None

No optimization—provides best debug support.

Low

The lowest level of optimization.

Medium

The medium level of optimization.

High

The highest level of optimization. Choose from:

Balanced, the highest level of optimization, balancing between speed and size.

Size, the highest level of optimization, favoring size.

Speed, the highest level of optimization, favoring speed.

No size constraints

Optimizes for speed, but relaxes the normal restrictions for code size expansion. This option is only available at the level High, Speed.

By default, a debug project will have a size optimization that is fully debuggable, while a release project will have a high balanced optimization that generates small code without sacrificing speed.

For a list of optimizations performed at each optimization level, see Optimization levels.

Enabled transformations

Selects which transformations that are available at different optimization levels. When a transformation is available, you can enable or disable it by selecting its check box. Choose between:

  • Common subexpression elimination

  • Loop unrolling

  • Function inlining

  • Code motion

  • Type-based alias analysis

  • Static clustering

  • Instruction scheduling

  • Vectorization

Note

In a debug project the transformations are, by default, disabled. In a release project the transformations are, by default, enabled.

For a brief description of the transformations that can be individually disabled, see Fine-tuning enabled transformations.