The compiler performs optimizations common to other optimizing compilers, for example,
data-flow optimizations such as common sub-expression elimination and loop optimizations
such as loop combining and distribution.
In addition, the compiler performs a range of optimizations specific to ARM
Although the compiler performs a number of architecture independent optimizations, you can often significantly improve the performance of your C or C++ code by selecting correct optimization criteria, and the correct target processor and architecture.
Optimization options can limit debug information generated by the compiler.