TASKING VX-toolset for ARM User Guide

TASKING VX-toolset for ARM User GuideThe Properties dialog appears.2. In the left pane, expand C/C++ Build and select Settings.In the right pane the Settings appear.3. On the Tool Settings tab, select C/C++ Compiler » Optimization.4. Select an optimization level in the Optimization level box.or:In the Optimization level box select Custom optimization and enable the optimizations you wanton the Custom optimization page.Optimization levelsThe TASKING C compiler offers four optimization levels and a custom level, at each level a specific setof optimizations is enabled.• Level 0 - No optimization: No optimizations are performed. The compiler tries to achieve a 1-to-1resemblance between source code and produced code. Expressions are evaluated in the order writtenin the source code, associative and commutative properties are not used.• Level 1 - Optimize: Enables optimizations that do not affect the debug-ability of the source code. Usethis level when you encounter problems during debugging your source code with optimization level 2.• Level 2 - Optimize more (default): Enables more optimizations to reduce the memory footprint and/orexecution time. This is the default optimization level.• Level 3 - Optimize most: This is the highest optimization level. Use this level when yourprogram/hardware has become too slow to meet your real-time requirements.• Custom optimization: you can enable/disable specific optimizations on the Custom optimization page.Optimization pragmasIf you specify a certain optimization, all code in the module is subject to that optimization. Within the Csource file you can overrule the C compiler options for optimizations with #pragma optimize flagand #pragma endoptimize. Nesting is allowed:#pragma optimize e /* Enable expression... simplification */... C source ......#pragma optimize c /* Enable common expression... elimination. Expression... C source ... simplification still enabled */...#pragma endoptimize /* Disable common expression... elimination */152