Optimizing code

The ARM compiler is highly optimizing, for small code size and high performance. 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 architecture‑based processors.

Even though the compiler is highly optimizing, you can often significantly improve the performance of your C or C++ code by selecting correct optimization criteria, target processor and architecture, inlining options, and by adopting good RISC programming practices.